Conference Proceedings Paper
RELAP5 Analysis of Integral Test of the Loss-of-RHR Event During the Mid-Loop Operation
NURETH-14 - 2011 September 25-30
Minoru Yamada (Institute of Nuclear Safety System, Inc.)
Hiroichi Nagumo (MHI Nuclear Engineering Company, Limited)
Ikuo Kinoshita (Institute of Nuclear Safety System, Inc.)
We are developing a statistical safety evaluation method using the RELAP5/MOD3.2 code for
the loss-of-RHR (Residual Heat Removal) event during the mid-loop operation. To confirm
the code prediction performance for gravity injection which is a one of the mitigation
measures for this event, the Bethsy 6.9a test was analyzed using RELAP5/MOD3.2. In the
analytical results, water mass flow rate into the pressurizer in the early period of the transient
event was overpredicted. But water mass flow rate into the pressurizer was able to be
decreased by artificially giving the circulation flow between core and the core bypass region.
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