Radiation Stability of the Referent Reactor Pressure Vessel JRQ Steel at High Neutron Fluence

摘要

The mechanical parameters of JRQ reactor pressure vessel steel after irradiation up to high neutron fluence are investigated. The irradiation of specimens is performed by using assembly of new type designed to assure homogeneous neutron field on the specimens. The assembly is installed in core zone restrictor cooling channel in order to achieve high neutron fluence on the specimens. It is established that maximal irradiation temperature in this position is higher than 292 ℃ and lower than 302 ℃. The comparison of the JRQ critical temperature shift obtained in this experiment with the data of other authors shows good agreement. The obtained value of critical temperature shift is used to derive an equation for shift dependency on neutron fluence in the investigated range.