Media

News

18.06.2014 15:00

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.

The completely Finnish-designed and Finnish-made device will be used to test the placement of disposal canisters in deposition holes bored in the bedrock. The device incorporates various types of precision mechanics. Complete with a canister, it weighs no less than 103 tonnes. The device’s multiple safety features are the result of careful design.

The first sketches of the canister installation device were drawn approximately four years ago.  In addition to two Turku-based engineering offices, several Posiva and TVO experts whose fields ranged from quality assurance to technology and commerce took part in the design and manufacturing phases.

“Investing in development work enables us to achieve savings through lower tunnel excavation and backfilling costs in the final disposal phase. The dimensions of the device are optimised with those of the tunnel. Other features that we have particularly focused on include availability, precision and safety,” says Posiva’s design engineer Jouni Tiainen.

The purpose of the canister installation device is to enable the disposal of spent nuclear fuel, enclosed in canisters, in special deposition holes bored in the Olkiluoto bedrock. According to the plan, the device will be used to transport the canisters from the interim storage, located more than 400 metres below the ground surface, to the deposition tunnel. Additionally, the device will be used to place the canisters in deposition holes lined with bentonite clay with an accuracy of 10 millimetres.

The canister will be transported inside a radiation shield located at the middle of the device. The shield will protect the canister from any rocks falling from the tunnel ceiling and reduce radiation levels in the vicinity of the canister.  The safety features prevent the canister from falling down during the transfer and installation.  This is ensured in several ways, one of which is that the friction caused by the canister loaded onto the device prevents the opening of the gripper mechanism holding the canister.

The canister installation device was manufactured in Pori. The manufacturing phase lasted for over two years. The device was brought to Olkiluoto in May. The testing will begin in the autumn. If required, the device will be developed further on the basis of the test results. The prototype to be tested will thus be used as a basis for the final version of the device, which will be constructed before the commencement of the final disposal operations in the early 2020s.


kapselikone1
The canister installation device leaving to Olkiluoto.



Return to headlines



Share article:
This website stores cookies on your computer. These cookies are used to improve our website and provide more personalised services to you.
Close

Cookies

To make this site work properly, we sometimes place small data files called cookies on your device. Most big websites do this too.

1. What are cookies?

A cookie is a small text file that a website saves on your computer or mobile device when you visit the site. It enables the website to remember your actions and preferences (such as login, language, font size and other display preferences) over a period of time, so you don’t have to keep re-entering them whenever you come back to the site or browse from one page to another.

2. How do we use cookies?

A number of our pages use cookies to remember your actions and preferences (such as login, language, font size and other display preferences.)

Also, some videos embedded in our pages use a cookie to anonymously gather statistics on how you got there and what videos you visited.

Enabling these cookies is not strictly necessary for the website to work but it will provide you with a better browsing experience. You can delete or block these cookies, but if you do that some features of this site may not work as intended.

The cookie-related information is not used to identify you personally and the pattern data is fully under our control. These cookies are not used for any purpose other than those described here.

3. How to control cookies

You can control and/or delete cookies as you wish – for details, see aboutcookies.org. You can delete all cookies that are already on your computer and you can set most browsers to prevent them from being placed. If you do this, however, you may have to manually adjust some preferences every time you visit a site and some services and functionalities may not work.

Close