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Decontamination of the Primary Circuit

Project identification: D2

Project name

Decontamination of the Primary Circuit

project status

Completed

Description

Objectives: to perform pre-dismantling chemical decontamination of primary circuits of both V1 NPP units to:

  • remove contamination from the primary circuit components to reduce dose levels around piping and equipment. Access to the installations is made easier this way, so that it becomes possible to use hands-on techniques for dismantling rather than the more expensive use of robotics or manipulators.
  • minimize the potential for spreading contamination during decommissioning activities.
  • reduce the contamination of components to such levels that they may be disposed of at a lower, and therefore more economical, waste disposal category.

The decontamination boundary will include the six Reactor Coolant Loops (RCL) of the Reactor Coolant System (RCS) for each one of the two reactor units. All major primary side systems, except for the reactor pressure vessel and the reactor internals, will be included in the decontamination flow path: steam generators, main coolant pumps, main gate valves, pressurizer, and primary coolant pipes.
Other auxiliary systems connected to the RCS (Primary circuit coolant purification system, Primary circuit normal refill system) remain operative and may be used by the Contractor in the decontamination process. Therefore, they may be used for the decontamination process, if the Contractor considers it advantageous to meet the decontamination targets.

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