119. 原子力発電プラントの健全性評価

圧力容器の評価

抄録

It is required to minimize qualitatively the radiation exposure for the public or nuclear employee in the cases of the normal operation and any accident of the nuclear power plant. Dr. Hideo Uchida, a member of Nuclear Safety Commission of Japanese government, has proposed a personal draft of acceptance criteria for the radiation damage, based on the magnitude of nuclear accident and its occurrence probability.
On the other hand, for example, it is not clear what category of hardware damage in the nuclear plant corresponds to an event of 5 rem-exposure-damage, which has been recognized to classify to a small break loss-of-coolant accident (SBLOCA), and its occurrence probability is the order of 10^-4/reactor·yr.
In this paper, the author has tried to connect radiation damage to the hardware damage by interposing the failure probability of the nuclear pressure vessel.
Recently, the assessment of the structural integrity for the nuclear pressure vessel has become one of the most important problem for the assurance of the nuclear safety. The author has discussed pressurized thermal shock (PTS) issue in this context and proposed new position in the assessment of structural integrity for the nuclear power plant.