BOILING WATER TYPE NUCLEAR REACTOR AND METHOD FOR PREVENTING CORROSION OF ITS STRUCTURAL MATERIAL

摘要

PURPOSE:To prevent the corrosion of the core structural materials of a boiling water reactor with which the relaxation of corrosive environment is difficult while suppressing the migration of <16>N which is radioactive nitrogen to a turbine system. CONSTITUTION:The core section 1 of the boiling water reactor is provided with electrodes 10 in the reactor water and the potential of the core structural materials is decreased to <=-230mV on the basis of a standard hydrogen electrode potential by controlling the potential difference between these electrodes 10 and the core structural materials at need. The corrosion of the core structural materials with which the relaxation of the environmental corrosion by hydrogen injection is difficult is relaxed while the migration of the radioactive nitrogen <16>N into the turbine system is suppressed. As a result, the corrosion of the core structural materials is lessened while the radiation dose of main steam system pipings and the turbine system and eventually the dose rate of site boundaries are suppressed.