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16.02.2017 Radiation and final disposal - what are they?

Posiva has published a new animation, which tells you what the radiation and final disposal are.

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26.02.2016 DOPAS 2016 seminar in Turku, Finland, May 2016

Results of European-wide cooperation on plugging and sealing technology will be presented in DOPAS 2016 seminar in Turku, Finland, May 2016.

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18.06.2015 Impact of permafrost on final disposal

Posiva has conducted thorough research on the impact of permafrost on the final disposal of spent nuclear fuel in the bedrock conditions of Olkiluoto. The Radiation and Nuclear Safety Authority of Finland (STUK) has assessed Posiva's research and in the safety assessment submitted by STUK in February to the Finnish Ministry of Employment and the Economy for the purposes of the construction licence of the final disposal facility, it concludes that final disposal can be implemented safely in accordance with Posiva's plan.

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16.04.2015 “How did you manage to do it?”

When it comes to final disposal, Finland and Sweden are more or less seen as oddities. In many other countries, the progress of final disposal programmes has been hampered by problems relating to matters such as selection of location, provision for the associated costs and political decision-making. In the North, however, the processes have progressed to the licensing phase, and the implementation of the plans is about to begin.

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01.04.2015 Test plug will be subjected to high pressure

A deposition tunnel must remain water-tight under all circumstances. This year will see the construction of a heavy plug in ONKALO’s demonstration tunnel. Once completed, the plug will undergo pressure testing.

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12.02.2015 Final disposal facility for spent nuclear fuel can be built to be safe

11 February 2015, the Radiation and Nuclear Safety Authority of Finland (STUK) issued to the Finnish Ministry of Employment and the Economy its statement on the safety of Posiva's facility for the encapsulation and final disposal of spent nuclear fuel.

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03.02.2015 Safety comes first as the processing of Posiva’s construction licence application progresses

The authorities have been assessing Posiva’s construction licence application for a spent nuclear fuel encapsulation plant and disposal facility for two years, and according to advance information, the time for decisions is now approaching.

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15.12.2014 Hi! and other ways of developing your work community

Greeting your co-workers, or failure to do so, has a surprisingly direct impact on the atmosphere at work. The people at Posiva took the matter in earnest and started a work community skills development project that continued for the whole of 2014.

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11.12.2014 Big change ahead

According to President Janne Mokka, Posiva’s main challenge is turning the long-term final disposal plans into actual construction work. The new President aims to lead Posiva into the final disposal phase.

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10.12.2014 Out of the classroom to learn about water and life

It is no surprise that pupils love the idea of trading a day of study in the classroom for a theme day at Olkiluoto.

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25.11.2014 Copper does not corrode in clean, oxygen-free water

Based on the results of the work of two separate teams of researchers, SKB (Svensk Kärnbränslehantering AB), the company responsible for final disposal in Sweden, has been able to confirm that copper does not corrode in clean, oxygen-free water. A very thin surface layer may corrode, but this does not have any significance for final disposal.

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14.11.2014 Young maiden to replace a retiring lady

The Swedish SKB has acquired a state-of-the-art vessel for the sea transportation of spent nuclear fuel. M/S Sigrid will be transporting Sweden's spent nuclear fuel for at least the next 30 years. The vessel could be of use to other nuclear power operators as well.

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03.11.2014 Learning from the past, looking to the future

Years of research on the glaciers of Greenland have come to their conclusion. Posiva now has more detailed information of the conditions that prevail during and after an ice age. This means another step in the right direction in the process of assessing the long-term safety of the final disposal of spent nuclear fuel.

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29.10.2014 Countries sparring each other

Cooperation between countries planning final disposal of spent nuclear fuel benefits all parties. Examples of achievements include a bentonite buffer installation vehicle, a canister transfer and installation vehicle, and the deposition tunnel plugging test.

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27.10.2014 Valuable information scurries around among the Olkiluoto wildlife

Even small animals can reveal big secrets to us, at least as part of a large-scale study. A ground beetle study is being conducted at Olkiluoto that will provide Posiva with information that is important for the assessment of the long-term safety of final disposal.

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01.09.2014 Posiva summer jobs worth an honourable mention

Posiva Oy received an honourable mention for the second time in a row in the “Vastuullinen kesäduuni” (Responsible Summer Employers) campaign. This summer, Posiva employed 15 summer trainees.

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25.06.2014 A world first

Special. New. Educational. Requiring know-how and precision. Surprising. Interesting. There are many ways to describe the big ten-year project. At Posiva, these attributes refer to the construction of ONKALO which commenced in summer 2004, opening a path to a totally new research world.

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18.06.2014 Extensive design work pays off: the canister installation device is ready

Four years of work has produced a result. A prototype of the canister installation device arrived in Olkiluoto in May.

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16.06.2014 There’s a plan in place for each and every open issue

Posiva has detailed plans to solve all open issues relating to the final disposal concept. Furthermore, the company has prepared description documents for the testing and demonstration of the functionality of the disposal concept.

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08.05.2014 “We can learn a lot from Finland”

The United Kingdom has a long way to go before a final disposal location can be established for the storage of its spent nuclear fuel. Following the consideration of a range of different disposal solutions, geological disposal is now the preferred option for storage of the UK's higher activity radioactive wastes. Richard Delley is spending six months at Posiva to gain an understanding of its preparations towards the final disposal of spent fuel in Finland.

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30.04.2014 Drilling of vertical shafts for ONKALO complete

All vertical shafts of the underground research facility ONKALO have now been drilled through. The last of the shafts to be drilled was the personnel shaft, with the final phase being completed in early April.

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Posiva testing copper canister inspection technology at Olkiluoto

The copper cast iron canister is the most significant technical release barrier of the final disposal concept. It is required to remain intact for tens of thousands of years, which is why the quality of the canister must be fully verified prior to final disposal.

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20.02.2014 ONKALO ventilation is one step closer to being ready – inlet air shaft raise-bored

The inlet air shaft of the underground ONKALO research facility is now complete. The last stretch of the shaft from 455 m to 290 m was raise-bored in early February. The work, which lasted for about 1.5 months, was performed by the Swedish-based Bergteamet AB.

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11.12.2013 Periodic review: Posiva is preparing for testing disposal techniques and the construction of the facility

Next year, Posiva will begin full-scale testing at the ONKALO work site to test the functionality of the installation equipment and techniques planned for final disposal. Information on using the new installation equipment will be gathered above ground before the installation of the bentonite buffer and the canister is tested in actual conditions inside ONKALO. The plan is to commission the aboveground test hall in February 2014.

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24.09.2013 Precondition for construction licence: Exceptionally comprehensive planning

Posiva submitted the construction licence application for the encapsulation plant and disposal facility for spent nuclear fuel to the Ministry of Employment and the Economy at the end of 2012. The permit process has progressed as planned. However, requests for additional reports are to be expected on almost the entire material.

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22.08.2013 Posiva receives honorary mention in the Vastuullinen kesäduuni (Good Summer Employers) competition

The Vastuullinen kesäduuni campaign challenges employers to provide young people with more and better summer jobs.

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16.07.2013 The leaktightness of the tunnel is ensured with a heavy plug

Massive reinforced concrete plugs are installed at the mouths of the deposition tunnels. The upcoming plugging test will serve to produce data on the functioning of the plugs – each of which is approximately six metres long and over 5.5 metres in diameter – in conditions similar to those occurring in the deposition tunnels.

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25.06.2013 Visitors can study the geology at Olkiluoto on a path at the Visitor Centre

An observation path on the grounds of the Olkiluoto Visitor Centre was opened for the general public in June. The around one-kilometre path that is easy to walk travels at the seashore and in the forest. "A great destination for large and small hikers alike," says Posiva's geologist Jyrki Liimatainen.

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25.04.2013 Bedrock protects and retains

Spent nuclear fuel will be stored in the future in the bedrock, which has been studied at Olkiluoto for more than 30 years. Bedrock modelling has become more and more accurate, and there are only very few minor surprises in store at this point. Most of the information has been obtained from the research facility ONKALO that extends 437 metres below the ground level. The ability of the bedrock to protect and retain is being studied at ONKALO as we speak.

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02.04.2013 Posiva's ONKALO site is facing a busy year end – excavation, underground studies and tests for new equipment

The preliminary works for initiating final disposal are being refined at Olkiluoto and ONKALO underground rock characterisation facility all the time. During this year, among other things, two new demonstration tunnels will be excavated, more information on bedrock suitable for final disposal will be gathered and new installation equipment planned for final disposal will be tested at the ONKALO site.

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08.02.2013 Focus of work at Olkiluoto turns to implementation of final disposal

When Posiva submitted the construction permit application for the final disposal facility in late 2012, the company reached a significant goal in its final disposal project. In the future, the focus of work at Olkiluoto will increasingly turn to the preparation of the implementation of the final disposal.

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16.01.2013 Need a climate forecast for the next 130, 10,000 or 120,000 years?

In 10,000 years' time, the coastline of western Finland will have moved 20 kilometres to the west, the climate will favour broadleaf trees, and the nesting season for birds will be longer than now. Although nobody can know for sure what sort of climate will prevail in Olkiluoto in thousands of years from now, forecasts are necessary when planning the final disposal of spent nuclear fuel.

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31.12.2012 Joint development of plugging and sealing technology for geological disposal facilities - the DOPAS Project

Launch of European-wide cooperation on plugging and sealing technology

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28.12.2012 Posiva submits Construction Licence Application For Final Repository to the Government

Posiva submitted its Construction Licence Application for a Final Repository for Spent Nuclear Fuel to the Government on 28 December 2012.

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03.12.2012 Posiva to launch extensive testing in ONKALO

In the next few years, Posiva will carry out a series of tests in the underground research facility ONKALO to ensure adequate competence for all the phases of final disposal of nuclear materials. The activities include tests that have never been carried out in Finland in full scale.

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19.10.2012 Roller pressing or extrusion - seeking the best pellet production methods

Posiva has been testing manufacturing methods for bentonite pellets to be used in the disposal of spent nuclear fuel. The practical research work was conducted at the Espoo and Jyväskylä facilities of the VTT Technical Research Centre of Finland. The work aimed to reveal the optimal composition, length and manufacturing method for the pellets.

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19.10.2012 Contracts for the technical level of ONKALO signed

Contracts have been signed for the construction of the building systems for the technical facilities of ONKALO, the Posiva underground characterization facility.

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03.09.2012 IAEA Director General Amano impressed by Posiva's work

"When ONKALO is ready, it is good news for the whole world," said IAEA Director General Yukiya Amano to the Länsi-Suomi newspaper after his ONKALO visit.

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07.05.2012 Posiva uses a prototype to gather information about installation of final disposal canisters

In early 2013, Olkiluoto will get a device which is the first of its kind in the world. With the prototype of the transfer and installation device of final disposal canisters, Posiva will be able to test the functionality of the canister installation plans in actual conditions.

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28.03.2012 Excavation mainly completed, ONKALO will now see building technology and structural work

In February, excavation of the ONKALO access tunnel reached 455 metres, which is the deepest location as per the existing plans. This does not mean that the work in the underground research facility would end. However, there will be a change in the construction work as the main emphasis will shift from excavation to building and structural work.

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08.03.2011 A tracer study was launched in ONKALO

A study has been launched at final disposal depth in ONKALO, where radioactive tracers were injected in a hole drilled in intact rock. The extensively prepared REPRO project (Rock matrix rEtention PROperties) has progressed to the field research stage. It will investigate the retention of radioactive substances in the microscopic porous network of intact rock.

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19.01.2012 Copper canister lid welded – everything went as planned in the matryoshka

Lid welding tests on the copper canister intended for the final disposal of spent nuclear fuel mean good news to Posiva. Posiva has not yet selected the final method for the closure of the final disposal canisters. Instead, the development work is still in progress. Electron beam welding is Posiva's reference method in the licensing.

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10.01.2012 Cool results from the red-hot cast testing

The casting of the insert of one final disposal canister requires almost 20 tonnes of melted iron. The pour point of the melted iron exceeds 1,300 degrees Celsius. For years already, inserts have been cast for development purposes at the Metso foundry in Jyväskylä, and they have been studied carefully through international cooperation. The cast testing of the inserts has reached the required material characteristics.

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02.11.2011 Researchers process the results of a decade-long final disposal experiment

A full-scale final disposal experiment has been conducted in Äspö's rock laboratory in Sweden for ten years now. The processing of the first parts of the experiment, managed by SKB, responsible for the final disposal project in Sweden, started in December 2010. After this, many different samples have been taken in Äspö to obtain more information about how the final disposal system designed in Sweden and Finland will function in actual rock conditions.

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07.10.2011 What kind of swamp will there be in Olkiluoto in the year 4000?

Researchers sought and found areas that could be similar to the swamps and lakes emerging in Olkiluoto. The purpose of the nature investigation is to find out how radioactive substances travel in the wild.

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05.09.2011 Bentonite activity tested in ONKALO

Bentonite clay will soon be put to the test in the underground research facility of ONKALO. A bentonite test that will start in September 2011 will test how the barrier material used in the disposal facility functions in practice.

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12.08.2011 Construction of the repository is assessed in the demonstration tunnels of ONKALO

In the ONKALO research facility in Olkiluoto, some 420 metres below ground level, excavation work has been going on since April 2011 for the demonstration tunnels, or the “DEMO” tunnels as they are known. In connection with the DEMO tunnels, the method for assessing the suitability of bedrock as well as methods associated with the construction of disposal tunnels and disposal holes are being assessed. Excavation of the first DEMO tunnel was completed in June 2011. Work for the second DEMO tunnel began in July 2011, and the aim is to excavate it to an approximate length of 120 metres by the end of 2011.

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01.08.2011 Final disposal data bored from deep waters under the Greenland glacier

A key question in Posiva's research and development work is how an ice age would affect the final disposal facility for spent nuclear fuel because an ice age is expected in Finland during the next 100,000 years. In cooperation with Sweden-based SKB and the Canada-based NWMO, Posiva is conducting a study in Greenland to obtain more information on ice age conditions. The impact of glacier meltwater deep in the rock is the main focus of the study. Anne Lehtinen, Hydrogeologist at Posiva, is involved in the study.

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19.07.2011 ONKALO excavation continues through new contract signed by Destia and Posiva

The excavation of the ONKALO access tunnel, launched in 2004, was completed in June. Since spring 2010, Destia has been responsible for the ONKALO excavation contract, and Posiva has agreed on continuing the excavation with Destia. The new excavation contract covers the construction of rock facilities at ONKALO's technical level at the depth of 438 metres, for example.

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21.03.2011 SKB submits a construction permit application for a final disposal facility

SKB submitted a construction permit application for a final disposal facility for spent nuclear fuel to the Swedish authorities on 16 March 2011. The final disposal plant has been applied for for two locations with an intention to build an encapsulation facility in Oskarshamn and the underground repository in Östhammar. It is expected that the permit application will be processed so that construction may be launched in 2015 and final disposal in 2025.

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11.02.2011 A new drilling jumbo is here for precision work

A new drilling jumbo, tailored according to Posiva's needs, was received in Olkiluoto at the end of January. The jumbo will be used for excavating the demonstration facilities – a task that requires high precision. For a successful drilling round detonated in the rock, it is very important to drill the holes in the rock as straight as possible and exactly at the intended spots.

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03.01.2011 Worker dies in accident at ONKALO

A fatal accident took place at the construction site of the underground research facility ONKALO in Olkiluoto, Eurajoki late on Sunday 2 January 2011. The accident occurred at the back of a tunnel reaching a depth of over 400 metres. Three workers equipped with iron bars were scaling the tunnel walls and ceiling. One of the workers was caught under a block of stone being barred down and died of the injuries he sustained.

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21.12.2010 Season's Greetings

Season's Greetings and Best Wishes for the New Year 2011.

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16.12.2010 Information on radiation and safety of disposal of nuclear waste

New information, including material on radiation of spent nuclear fuel and the multi-barrier principle for final disposal, has been added to Posiva’s website. There is also an interactive program that gives an overview of different aspects of safe final disposal.

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13.12.2010 Answers to Frequently Asked Questions

The Databank section of Posiva’s website has now its own page for Frequently Asked Questions. This section contains most common questions Posiva is asked, together with their answers.

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20.09.2010 Marking the disposal site would be a major challenge

When discussing final disposal of spent fuel, the question of marking it for the benefit of future generations is often raised. Should the final disposal site be marked? If so, how? There is also an ongoing discussion on whether future generations will be interested in today’s disposal project and spent fuel to an extent that would warrant an intrusion of the disposal facilities.

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23.07.2010 Study holes in ONKALO now complete

The ONKALO facility now comprises a total of five research niches, which are approximately 30-metre branches of the access tunnel. One of them, known as the POSE niche, contains three study holes with a diameter of 1.5 metres and a depth of approximately seven metres (7.26 m exactly). These holes emulate the disposal canister hole, even though their diameter is slightly smaller than that of the actual hole.

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02.07.2010 Finnish Parliament approves extension of the final disposal facility for the Olkiluoto 4 unit

The Finnish Parliament approved the extension of Posiva's final disposal facility for spent nuclear fuel from the Olkiluoto 4 unit on 1 July 2010 by 159 votes to 35. The extension will increase the capacity of the final disposal facility by 2,500 uranium-tons of spent nuclear fuel.

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31.05.2010 The final disposal project proceeds at the terms of safety

YLE has published a story on its website and morning news on TV Channel One which states that the final disposal schedule is too tight. Posiva’s response and clarifications related to the story are presented below.

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24.03.2010 Experts assembled for the TKS Seminar at the Finlandia Hall

Posiva’s research, development and planning work extending to year 2012 (the TKS-2009 programme) was presented to the company’s domestic and international partners at the Finlandia Hall on 10 March 2010. The TKS-2009 programme, finalised last autumn and submitted to the authorities, is a document with more than 500 pages describing the research, development and planning work central to the construction licence application for the disposal facility.

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19.03.2010 Posiva signs an agreement with Rakennustyöt Ville Kauppi Oy

Part of the ventilation and hoisting equipment buildings of the ONKALO area will be constructed in the next few months. The construction work covers thousands of square metres.

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03.03.2010 Posiva Oy awarded an environmental certificate

On 7 February 2010, DNV Certification Oy awarded Posiva an environmental certificate based on the ISO 14001:2004 standard.

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22.02.2010 New animations about ONKALO and encapsulation and final disposal

New animations about ONKALO and encapsulation and final disposal of spent nuclear fuel can now be found from Posiva's internet pages.

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03.02.2010 TKS-2009 Nuclear Waste Management at Olkiluoto and Loviisa Power Plants: Review of Current Status and Future Plans for 2010-2012 has been published

This report is a translation of the Finnish TKS-2009 Programme Report published in September 2009

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04.12.2009 Start of excavation work for the ventilation and hoist building

Excavation work for the ventilation and hoist building has begun at the ONKALO construction site at the end of November and will continue until January. Contractor for the excavation work is Lännen Kaivuu ja Louhinta OY. The ventilation and hoist building will be completed during 2011, after which the ventilation of ONKALO will be handled through it.

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27.11.2009 A new research niche in ONKALO

A new research niche has been completed this fall in the underground characterisation facility ONKALO. The research niche, which is the third in total, has been excavated at the tunnel length of 3620 metres and is in effect a side tunnel which reaches circa 60 metres sideways from the main tunnel. The experiences and knowledge obtained from the excavation of the research niche (the EDZ research niche) can be utilised in the future when the excavation of the actual final disposal tunnels will commence.

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30.10.2009 Posiva aiming to submit a construction licence application in 2012

The TKS–2009 programme prepared by Posiva, outlining the research, development and technical design work related to spent nuclear fuel disposal, was submitted to the Ministry of Employment and the Economy at the end of September.

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Three drilling holes made during summer

This past summer saw the making of three drilling holes at Olkiluoto. OL-KR51 reached 650 metres, OL-KR52 427 metres and OL-KR53 300 metres below the ground.

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26.08.2009 The Municipality of Eurajoki issues a statement in favour of Posiva's application for a Decision-in-Principle

The Municipal Council of Eurajoki approved on 24 August 2008 a statement in favour of Posiva's application for a decision-in-principle on the expansion of the final disposal facility in Olkiluoto to accommodate also spent fuel from the third nuclear power plant unit in Loviisa. The decision was carried with 22 votes in favour and 4 against.

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24.07.2009 New drilling holes at Olkiluoto

During the summer two new drilling holes have been made at Olkiluoto.

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06.07.2009 Corrosion resistance of disposal canister

The canister plays an important role in the final disposal of spent nuclear fuel. The massive interior of the canister, manufactured from spheroidal graphite cast iron, makes the canister mechanically strong. A five-centimetre thick copper cladding protects the inner part and the canister from corrosion.

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03.07.2009 The consideration of permafrost in final disposal

According to Professor Matti Saarnisto, Posiva’s estimates on future periods of permafrost are in conflict with empirical observations and estimates from other studies.

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26.06.2009 The current status of the licensing process for the extension of the final repository

In March 2009, Posiva submitted an application for a decision-in-principle to the Government regarding an extension of the final disposal facility to the extent that the spent nuclear fuel from the Loviisa 3 plant unit planned by Fortum Oyj and Fortum Power and Heat Oy can be finally disposed of at Olkiluoto.

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18.03.2009 Posiva's web site renewed

Posiva's web site has been renewed in terms of not only the visual outlook and construction, but also the content. We welcome any feedback on the new site; please use the form available in the Contact Posiva section.

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13.03.2009 Posiva applies for a decision-in-principle concerning the final disposal of the spent fuel from the Loviisa 3 unit

Posiva Oy has today submitted an application for a decision-in-principle to the Government, concerning the final disposal of the spent fuel from the Loviisa 3 unit to Olkiluoto in Eurajoki. The application is part of the decision-in-principle process of Fortum Oyj and Fortum Power and Heat Oy (Fortum). On 5 February 2009, Fortum submitted an application to build a third nuclear power plant in Hästholmen in Loviisa.

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27.01.2009 Certification granted to Posivas Quality System

ISO 9001:2000 certificate was granted to Posivas Quality System on 15 December 2008 with Det Norske Veritas AS (DNV) as the certification body.

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03.12.2008 ONKALO personnel shaft to be extended down to 290 metres

The personnel shaft of ONKALO is being extended from 180 metres down to 290 metres. The exhaust air shaft of ONKALO was earlier in the autumn raise-bored to this depth, and according to plans, the inlet air shaft will also be drilled down to 290 metres next year.

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13.05.2008 Posiva submitted EIA programme pertaining to extension of final disposal facility

Posiva Oy, a company responsible for the final disposal of spent nuclear fuel of its owners, has today submitted the Environmental Impact Assessment programme to the Ministry of Employment and the Economy. The EIA procedure pertains to the extension of the final disposal facility of spent nuclear fuel under design in Olkiluoto by a volume of 3000 tons of uranium to accommodate a total of 12000 uranium tons of spent nuclear fuel instead of the previously designed 9000 uranium tons. With the planned extension of the final repository Posiva prepares for receiving spent nuclear fuel from the potential Loviisa 3 nuclear power plant unit of Fortum Power and Heat Oy.

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25.04.2008 Posiva applies for decision in principle on final disposal of spent fuel from Olkiluoto 4

Posiva Oy has today submitted an application to the Finnish Government for a decision in principle on the final disposal of spent nuclear fuel from Olkiluoto 4 in Olkiluoto in the Municipality of Eurajoki. The application is part of the decision in principle process of Teollisuuden Voima Oyj (TVO). TVO has today submitted an application for the construction of the fourth nuclear power plant unit in Olkiluoto.

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08.01.2008 Posivas final disposal project proceeds according to plans - EIA process for a more extensive repository to start

The excavation of the underground research facility ONKALO designed for research on the final disposal of spent nuclear fuel has proceeded according to plans in Olkiluoto. The almost 2.6-kilometre long tunnel now extends to a depth of ca. 240 metres. Ventilation and personnel shafts have also been raise-bored to a depth of 180 metres.

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19.06.2007 Ventilation shaft in ONKALO reaches down to a depth of 178 metres

The construction project of ONKALO, the underground facility for research related to final disposal of spent nuclear fuel, has reached another milestone, with the ventilation shaft completed at a depth of 178 metres. The shaft was excavated as a rise-boring operation, using a reamer bit with a 3.5 metre diameter. The Swedish Bergteamet Company was in charge of the rise-boring operation.

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23.04.2007 ONKALO EXTENDS NOW OVER TWO KILOMETRES - Research data confirm earlier perception of bedrock in Olkiluoto

The construction of the underground characterisation facility ONKALO, built for investigations related to final disposal of spent nuclear fuel, has now progressed to a length of ca. 2010 metres, and to a depth of almost 200 metres. Investigations and excavation operations proceed on schedule, and according to plans the final disposal depth at -420 m level will be reached in 2009. The application for the construction licence of the repository is scheduled to be submitted to the Finnish Government in 2012.

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24.05.2006 Raise drilling of ventilation shaft in ONKALO completed

The ventilation shaft of ONKALO, the underground facility for research on final disposal, has been completed down to a depth of ca. 90 metres. The shaft was realised using the raise drilling technique, in which a raise borer at ground level pulls a 3.5-metre diameter reamer bit upward from the bottom of the pilot hole. The raise drilling operation was implemented by the Swedish company Bergteamet.

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19.12.2005 Fourth meeting of INAGO, INAGO-4

The fourth meeting of INAGO (The International Advisory Group for Olkiluoto Investigations), INAGO-4, took place in November 2005 at the Hanasaari Cultural Centre, Espoo. The purpose of the meeting was to examine various elements of Posiva’s research and investigation programme in the ONKALO, including the revision of the CEIC procedures and the reorganisation of the ONKALO project; to provide a response to subjects raised by INAGO in their Issue List; to present the proposed programme on the EDZ (a subject raised by STUK); to examine elements of the integration of the ONKALO programme and, jointly with the Safety Committee, to consider a report from Posiva entitled “Control of water inflow and use of cement in the ONKALO after penetration of fracture zone R19”.

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05.07.2005 Third meeting of INAGO, INAGO-3

The third meeting of INAGO, INAGO-3, took place in June 2005 in Pori. The purpose of the meeting was mainly to examine the procedure known as Co-ordination of Engineering Design, Investigations and Construction (CEIC) for use in the ONKALO, to examine the integration of the research and the investigations in the ONKALO programme and to discuss and clarify the comments and recommendations made at the INAGO-2 meeting.

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01.02.2005 Second meeting of INAGO, INAGO-2

The second meeting of INAGO, INAGO-2, took place in December in Helsinki. The purpose of the meeting was to discuss and clarify the comments and recommendations of INAGO-1, to examine STUK’s Issue List and Posiva’s plans for resolving these issues, to consider Posiva’s plans for quality management and to discuss STUK’s review of TKS-2003 and Posiva’s response to this review.

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12.11.2004 First Meeting of INAGO

INAGO (International Advisory Group on Olkiluoto Investigations) is a new international advisory group, which has been set up by Posiva to support them in making decisions related to their strategic goal of submitting a successful application for a construction licence for the spent fuel repository at Olkiluoto by the end of 2012. Its objectives are to advise Posiva on issues related to the performance and objectives of the underground investigations programme and on the management of the underground activities; to advise on the integration of the ONKALO investigations with the overall characterisation of the Olkiluoto site; to review the main results and reports from the ONKALO programme and from the other continuing investigations on the Olkiluoto site; and to assess the scientific quality and applicability of the research and investigations from an international perspective.

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30.06.2004 Construction work starts on underground characterisation facility at Olkiluoto

Research into the final disposal of spent nuclear fuel entered a new phase today when Posiva Oy, which is responsible for the project, started construction work on the ONKALO underground characterisation facility at Olkiluoto. The over 500-metre deep tunnel leading down to the characterisation facility is expected to be completed by 2010. Sinikka Mönkäre, Finnish Minister of Social Affairs and Health, set off the first blast that signified the start of the construction of ONKALO.

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30.06.2004 Construction work starts on underground characterisation facility at Olkiluoto

Research into the final disposal of spent nuclear fuel entered a new phase today when Posiva Oy, which is responsible for the project, started construction work on the ONKALO underground characterisation facility at Olkiluoto. The over 500-metre deep tunnel leading down to the characterisation facility is expected to be completed by 2010. Sinikka Mönkäre, Finnish Minister of Social Affairs and Health, set off the first blast that signified the start of the construction of ONKALO.

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20.05.2003 Posiva files construction permit application for research facility with Municipality of Eurajoki

Posiva Oy, which is responsible for the final disposal of spent nuclear fuel in Finland, today filed the construction permit application for the underground research facility ONKALO with the Municipality of Eurajoki. The research facility will be constructed to verify the results so far obtained by drillings from above ground on the suitability of the bedrock in Olkiluoto for final disposal. The construction of ONKALO will facilitate the planning of the final repository and the research activities carried out in ONKALO will produce information required for filing the building permit application for the final repository with the Finnish Government.

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20.05.2003 Posiva files construction permit application for research facility with Municipality of Eurajoki

Posiva Oy, which is responsible for the final disposal of spent nuclear fuel in Finland, today filed the construction permit application for the underground research facility ONKALO with the Municipality of Eurajoki. The research facility will be constructed to verify the results so far obtained by drillings from above ground on the suitability of the bedrock in Olkiluoto for final disposal. The construction of ONKALO will facilitate the planning of the final repository and the research activities carried out in ONKALO will produce information required for filing the building permit application for the final repository with the Finnish Government.

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04.06.2002 Posiva chooses the access way - a tunnel leads in to the underground characterization facility

In the next few years, Posiva will start to construct an underground characterization facility on the island of Olkiluoto in Eurajoki, which has been selected as the site for the final disposal facility of spent nuclear fuel. This characterization facility is called ONKALO, and it will be used to acquire detailed information about the bedrock in Olkiluoto, to be utilised in the planning of the final disposal facility. After an evaluation of various access way types for ONKALO, it has been decided to use an access tunnel. Another alternative that was considered would have been a shaft type access way.

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04.06.2002 Posiva chooses the access way - a tunnel leads in to the underground characterization facility

In the next few years, Posiva will start to construct an underground characterization facility on the island of Olkiluoto in Eurajoki, which has been selected as the site for the final disposal facility of spent nuclear fuel. This characterization facility is called ONKALO, and it will be used to acquire detailed information about the bedrock in Olkiluoto, to be utilised in the planning of the final disposal facility. After an evaluation of various access way types for ONKALO, it has been decided to use an access tunnel. Another alternative that was considered would have been a shaft type access way.

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