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The status of the preparation works tor the thermal annealing operation at reactor pressure vessel (RPV) V-230-type Unit 2 in Jaslovské Bohunice planned for Autumn 1993 is presented in this paper. The producer of the RPV W-213 type. ŠKODA Works, will perform the thermal annealing operation and manufacture all equipment needed. During the planned shutdown for the refueling operation of this unit in September 1989, samples were prepared from base material (BM) and weld metal (WM) by means of special equipment used for the analysis of the chemical composition in the Nuclear Power Plants Research Institute (VÚJE) laboratories. Results of the analysis of the irradiated samples and the hardness measurements of RPV material before and after annealing operation serve as the measure of radiation embrittlement recovery efficiency. Possible extension of the operation life of RPVs of WWER type by means of suitable provisions during normal operation before thermal annealing is also discussed.
annealing, radiation embrittlement recovery, chemical analysis, hardness, transition temperature
Nuclear Power Plants Research Institute (VÚJE), Trnava,
Nuclear Power Plant (EBO) Jaslovské Bohunice, Jaslovské Bohunice,