Developing the Stress Test Gap Analysis Methodology for Nuclear Power Plants

Korea had demonstrated the safety of long-term operational nuclear power plants by implementing stress test such as Wolsong-1 & Kori-1 unit. It was decided to extend the stress test to all the nuclear power plants in Korea. And KHNP is evaluating the capability of responding to the operational plant in the event of severe accidents that exceed the design basis. The stress test will be conducted in the first stage; conduct a representative nuclear power plant test for each reactor type, OPR1000, CANDU, Framatom, Westinghouse types, included partial of APR1400. The public questioned the safety of nuclear power plant after the Fukushima accident. Korea has already proven the safety of nuclear power plant through conducting the stress test on the long-term operation. Now a new challenge has begun. It will prove all of the nuclear power plants in Korea. As noted earlier, it is very difficult to conduct a stress test on an entire plant in a short time. The stress test is also more complicated in Korea, where various types of nuclear reactors are mixed up. Under these difficult conditions, the methodology for the GAP analysis was developed for conducting the effective stress test.