Depressurization strategies on OPR1000 during SB/MBLOCA for operation of the passive safety injection system in IPSS = OPR1000 소형 및 중형냉각재상실사고 시 통합피동안전계통 내 피동안전주입계통 운용을 위한 감압전략

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The Fukushima accident brought multiple Beyond Design Basis Accidents (BDBA) in nuclear power plants (NPP) to reality. To prevent the next Fukushima, current and future NPPs should retain coping ability for the BDBAs. As a passive supplement to deal with Station Black-out (SBO), the Integrated Passive Safety System (IPSS) was suggested for current generation Ⅲ NPPs. With two elevated water tanks, IPSS possesses capabilities of containment preservation and core cooling with gravitational head under SBO. In a pressur-ized water reactor (PWR), primary pressure needs to decrease substantially under small and medium break loss of coolant accidents (SB/MBLOCA) to initiate a safety injection system. However, many Generation Ⅲ NPPs have difficulties in sufficient depressurization of the reactor coolant system (RCS) for the IPSS opera-tion with their original RCS depressurization system. To overcome the limitation, installation of squib valves on hot legs and indirect RCS depressurization using atmospheric dump valve (ADV) were proposed as an invasive and non-invasive methods. The effectiveness of the proposed methods were evaluated by the MARS -thermal hydraulic evaluation code-. Results show that both methods have successful depressuriza-tion capability to reach the pressure less than 4 bar that IPSS needs. The RCS depressurization strategy of PWR was attained not only for IPSS operation but also for insight on general RCS depressurization during LOCA.
Advisors
Kang, Hyun Kookresearcher강현국researcherChang, Soon Heungresearcher장순흥researcher
Description
한국과학기술원 :원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2015
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 원자력및양자공학과, 2015.2 ,[iii, 56 p. :]

Keywords

IPSS; Severe Accident; SBO; OPR1000; Depressurization; 통합피동안전계통; 중대사고; 전원상실사고; 가압경수로; 감압

URI
http://hdl.handle.net/10203/221619
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=657575&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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