Simulation of station blackout scenario in low-power and shutdown condition of Westinghouse two-loop plant with RELAP5 code

A station blackout scenario in low power and shutdown condition of Westinghouse two-loop plant is simulated with RELAP5 code. To evaluate plant safety in station blackout scenario for low-power and shutdown condition, the transient calculation with RELAP5 code has been carried out for a Westinghouse two-loop plant. Without core cooling, the boiling in core and spent fuel pit occurs. The core uncovery is observed about 160 hours and the peak cladding temperature exceeds 1206K at 161.1. Station blackout is the complete loss of alternating current (AC) electrical power to the essential and nonessential switchgear buses in a nuclear power plant. Because many safety systems required for reactor core cooling and containment heat removal depend on AC power, the consequences of a station blackout could be severe. Especially, station blackout in low-power and shutdown condition is one of the current issues. Therefore, the evaluation of plant safety with safety analysis code is opportune