ANALYSIS OF MAXIMUM EXTENSION LOAD LINE LIMITATION FOR BOILING WATER REACTOR

摘要

PROBLEM TO BE SOLVED: To safely operate a reactor at a low core flow rate. SOLUTION: This method 40 for extending the operation range of a boiling water reactor 10 comprises a step of determining a raised load line characteristic for improving the reactor performance, a step 44 of executing a safety evaluation in the position of the raised load line to decide the observance of safety design parameters, and the step 46 of executing an operation evaluation in the raised load line. This method also comprises a step of defining one set of operation conditions for reactor within an upper operation area 74 characterized by the raised load line 76, and a step of executing a detail analysis for the performance of a core recalculating system and the control part of this system. This method 40 further comprises a step 52 of correcting the process control device and process computer of the rector so that the operation of the reactor within an extended operation area can be performed in the range of a prescribed safety parameter. The set value for safety moderation is also regulated so that the operation of the reactor within the extended operation area 74 can be performed.