Login to the D&D KM-IT.

Not a registered user? click here for U.S. registration or here for international registration.      Forgot your password? Click here

User name:   Password:   Close

Search the D&D KM-IT

Welcome Guest
Try our mobile friendly tool.

Share page:  

printer friendly logo

Technology Factsheet

Greifswald Nuclear Power Plant (KGR) Dismantling System

Category: Robotics > Dismantling and Retrieval > Bespoke System
Reference # : Model No :

Dismantling activities were carried out in the steam generator room, which is situated around the RPV. Cutting (dry and wet), packaging and transfer areas were installed. The complete system was designed to be mobile and was first installed in Unit 5 for inactive testing before installation and commissioning in Unit 2. Inactive testing started mid 1999 and was completed by the end of 2002.

Site:Other
Industry:Nuclear
Size:Very Large (>100kg/200lb, >120cm/48in)
TRL:Operational (9)
TRL2:Operational (9)
Tether: *
Waterproof: *
Payload: *
Reach: *
Manipulator: *

Benefits

Limitations

Comments

On the Greifswald site, there are in total eight reactor units of the Russian pressurized water reactor type WWER-440 (Wasser-Wasser-Energie-Reaktor). Units 1 to 4 are model V 230 while Units 5 to 8 are the more recent model V 213.

After the reunification of the German States, the 4 operating units of the Greifswald Nuclear Power Plant were shut down and the trial operation of Unit 5 and all construction work for the Units 6 – 8 were also halted. In 1990, the decision was taken to decommission Units 1 - 4, followed by the same decision for Unit 5 in 1991.

The reactors are configured on a double-unit basis, i.e. two reactors are arranged in one reactor hall with certain mechanical equipment and secondary systems together. On the other hand, there is only one turbine hall (roughly 1 200 m long) for all reactors.

Dismantling activities were carried out in the steam generator room, which is situated around the RPV. Here cutting (dry and wet), packaging and transfer areas were installed. The complete system was designed to be mobile and was first installed in Unit 5 for inactive testing before installation and commissioning in Unit 2. Inactive testing started mid 1999 and was completed by the end of 2002. The selected techniques to be applied are summarised below.

Dry:
- reactor pressure vessel (band saw)
- upper part of protection tube unit (disc cutter)
- upper part of reactor cavity (plasma arc, oxyacetylene burner)

Wet: (pool)
- core basket (band saw)
- lower part of protection tube unit (Contact Arc Metal Cutting)
- lower part of reactor cavity (plasma arc)
- cavity bottom (fret-saw)

After initial difficulties caused by a massive reduction in personnel combined with the introduction of a market economy and West German laws and procedures, EWN has succeeded in restructuring the company to arrive at a size suited to the task of decommissioning. The decommissioning and dismantling of the Russian WWER type reactors as such do not pose any specific problems. However, the size of the project and the resulting waste management task is vast. It can be concluded that dismantling of nuclear facilities is basically not a technical problem but rather a challenge to project management and logistics, once the legal and economic boundary conditions have been clarified. In order to achieve a safe and cost effective project, it is necessary that all stakeholders (i.e., operator/owner (EWN), authority and authorised experts, and the public) work together.

To sum up, the lessons learned are:
- That the development of a comprehensive inventory is a necessary prerequisite for all planning.
- That social aspects and psychological effects must be taken into account. • the requirement to have a clear licensing structure – a single license is preferred rather than several smaller licenses, if the project is not too large
- The importance of obtaining clear and realistic requirements from the licensing authority (related to real safety risks).
- That the overall project must be planned, i. e. from shut down to disposal.
- The importance of establishing a project structure which integrates all site activities.
- The communication of open public information is a key activity.
- The use of simple and sturdy tools/equipment, and use of mock-up tests if new or complicated technology is used.
- The benefit of strictly applying the ALARA principle when planning the project.

Operational Experience:

Pictures

Videos

 
  
Back to Top
More Modules

Download Original    Management of D&D of Oak Ridge Building 3505 | After

Pre cache