NATURAL CIRCULATION NUCLEAR REACTOR SYSTEM AND OPERATION METHOD THEREFOR

摘要

PPROBLEM TO BE SOLVED: To provide a natural circulation nuclear reactor system having a sufficiently enhanced profitability, and an operation method therefor. PSOLUTION: The natural circulation nuclear reactor system comprises a natural circulation nuclear reactor, a main steam pipe 9, a supply water pipe 10, and a flow regulating valve 15. The natural circulation nuclear reactor comprises a reactor core 1 with a fuel assembly 23 having a same geometric shape as that of a fuel assembly used in a forced circulation boiling water reactor loaded therein, a reactor pressure vessel 5 accommodating the reactor core 1, and a control rod 7 penetrating the reactor pressure vessel 5 and removably installed in the reactor core 1 for controlling an output of the reactor core 1. The main steam pipe 9 is connected to the reactor pressure vessel 5 for guiding steam from the core 1 to a turbine 8. The supply water pipe 10 condenses the steam which has been used for driving the turbine 8 and recirculates condensate to the reactor pressure vessel 5. The flow regulating valve 15 regulates a reactor water level H in the reactor pressure vessel 5 by controlling a flow rate of the condensate. PCOPYRIGHT: (C)2004,JPO