Proceedings of the Korean Nuclear Society Conference (한국원자력학회:학술대회논문집)
- 1998.05a
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- Pages.417-422
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- 1998
RCGVS Design Improvement and Depressurization Capability Tests for Ulchin Nuclear Power Plant Units 3 and 4
- Sung, Kang-Sik (Korea Power Engineering Company, Inc) ;
- Seong, Ho-Je (Korea Power Engineering Company, Inc) ;
- Jeong, Won-Sang (Korea Power Engineering Company, Inc) ;
- Seo, Jong-Tae (Korea Power Engineering Company, Inc) ;
- Lee, Sang-Keun (Korea Power Engineering Company, Inc) ;
- Keun hyo Lim (Korea Electronic Power Corporation) ;
- Park, Kwon-Sik (Korea Electronic Power Corporation) ;
- Oh, Chul-Sung (Korea Electronic Power Corporation)
- Published : 1998.05.01
Abstract
he Reactor Coolant Gas Vent System(RCGVS) design for Ulchin Nuclear Power Plant Units 3&4(UCN 3&4) has been improved from the Yonggwang Nuclear Power Plant Units 3&4(YGN 3&4) based on the evaluation results for depressurization capability tests performed at YGN 3&4. There has been a series of plant safety analyses for Natural Circulation Cooldown(NCC) event and thermo-dynamic analyses with RELAP5 code for the steam blowdown Phenomena in order to optimize the orifice size of UCN 3&4 RCGVS. Baesd on these analyses results, the RCGVS orifice size for UCN 3&4 has been reduced to 9/32 inch from the l1/32 inch for YGN 3&4. The depressurization capability tests, which were performed at UCN 3 in order to verify the FSAR NCC analysis results, show that the RCGVS depressurization rates are being within the acceptable ranges. Therefore, it is concluded that the orificed flow path of UCN 3&4 RCGVS is adequately designed, and can provide the safety-grade depressurization capability required for a safe plant operation.
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