Final disposal

Encapsulation Plant

Spent nuclear fuel is packed in canisters in the aboveground encapsulation plant. Facilities for auxiliary operations are also located above ground.

Encapsulation Plant

Fuel is delivered to the receiving area of the encapsulating plant packed in transportation cask. This receiving area is also place where the empty final disposal canisters are delivered. In the encapsulation plant, both the transportation cask and the final disposal canister are then docked tightly inside the fuel handling cell, where the fuel is transferred from the transportation cask first to the drying station and then to the final disposal canister. When all fuel assemblies have been transferred to the canister, it is filled with argon gas and then tightly closed with an inner steel cover.

From the handling cell, the filled canister is transferred to a welding station. Now the canister lid is sealed with electron beam welding, which guarantees a tight and strong seam. Next, the tightness of the weld is inspected at a inspection station using non-destructive testing methods, such as x-ray and ultrasonic testing.

The encapsulation plant has been designed in such a manner that no hazardous amounts of radioactive substances will be released to the environment even if a disturbance occurs during the fuel encapsulation process. Canisters that have passed the inspection are then transferred either by lift or by the access tunnel with a special-purpose vehicle to the final disposal facility.

Facilities for Auxiliary Operations

In addition to the encapsulation plant, the aboveground buildings include facilities for auxiliary and supporting operations, such as the operational building, the ventilation building, the research building, storage hall and repair shop facilities as well as facilities required by the HVAC and electricity systems. Separate areas will be reserved for storing excavated materials and crushed rock as well as for the necessary construction site activities. The aboveground construction area of the disposal facility (i.e., the surface area of buildings, roads, storehouses and fields) is a total of approximately 20 hectares.


Havainnekuva Kapselointilaitoksesta 2014

Figure:
Longitudinal section of the encapsulation plant where different functions are:

  1. Receiving and storage area for new canisters
  2. Hot cell
  3. Copper lid welding chamber
  4. Weld inspection
  5. Canister surface cleaning area
  6. Canister lift for transfer of canisters into repository.

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