Contamination Simulation of DOEL-4 PWR Using The OSCAR V1.2 Code and Parametrical Studies During Cycles or Cold Shutdowns

摘要

The purpose of the OSCAR code, developed by the CEA in cooperation with EDF and AREVA NP, is to predict the contamination of the PWR primary system. The OSCAR code allows researchers to analyze corrosion products and fission products behavior and to calculate the activity in the fluid and the surface activity in the primary system. Nowadays, the OSCAR code is considered to be not only a tool for numerical simulations and predictions but also one that might combine and organize all new knowledge useful to progress on contamination caused by Activated Corrosion Products (ACPs). The OSCAR V1.2 code is used for ACPs simulation studies of DOEL-4 reactor. The 22 first cycles have been simulated and compared with measurements [1] of surface activities on the loops. Since, this simulation is the reference of DOEL-4 parametrical studies done with OSCAR V1.2. The effect on contamination by ACPs of a 4-month operation at 50% power during a cycle will be introduced. The results will be focused on volume and surface activities during the cycle and the following shutdown. Then several studies on mid-cycle shutdowns of a given length of time or with startup criteria on ~(58)Co volume activity will be presented. Last, results of parametrical studies performed on early oxygenation during cold shutdown will be given.