Detailed Evaluation of RCS Boundary Rupture during High-Pressure Severe Accident Sequences

作者：Park Rae Joon^*; Hong Seong Wan

来源：Journal of Nuclear Science and Technology, 2011, 48(11): 1396-1402.

DOI：10.3327/jnst.48.1396

• severe accident
• creep rupture
• RCS depressurization
• high-pressure severe accident
• reactor vessel rupture

A depressurization possibility of the reactor coolant system (RCS) before a reactor vessel rupture during a high-pressure severe accident sequence has been evaluated for the consideration of direct containment heating (DCH) and containment bypass. A total loss of feed water (TLOFW) and a station blackout (SBO) of the advanced power reactor 1400 (APR1400) has been evaluated from an initiating event to a creep rupture of the RCS boundary by using the SCDAP/RELAP5 computer code. In addition, intentional depressurization of the RCS using power-operated safety relief valves (POSRVs) has been evaluated. The SCDAPRELAP5 results have shown that the pressurizer surge line broke before the reactor vessel rupture failure, but a containment bypass did not occur because steam generator U tubes did not break. The intentional depressurization of the RCS using POSRV was effective for the DCH prevention at a reactor vessel rupture.

• 出版日期2011-11