CORE FOLLOW AND COLD CRITICAL CALCULATIONS OF OPERATION CYCLES AFTER EXTENDED OUTAGE IN BWRS

摘要

Core follow and cold critical calculations of several cycles including cycles after extended outage are performed for Japanese commercial BWRs using CASMO-4/SIMULATE-3. The core follow calculation results and cold eigenvalues in cycle after extended outage are compared to those in cycles after normal outage. Hot eigenvalues and traversing in-core probe (TIP) route mean square (RMS) errors are evaluated in the core follow calculation. The comparison shows that the change of reactivity caused by extended outage is properly evaluated, and that the TIP RMS errors are similar between the cycles after normal outage and extended outage. The cold eigenvalues are also evaluated in the cold critical calculation. The levels of cold eigenvalue in cycle after extended outage are similar to those in cycles after normal outage. These comparison results show that CASMO-4/SIMULATE-3 is applicable to the evaluation in cycle after extended outage.