Development of margin assessment methodology of decay heat removal function against external hazards, 1; Project overview and snow PRA methodology

Yamano, Hidemasa ; Nishino, Hiroyuki ; Kurisaka, Kenichi ; Okano, Yasushi; Sakai, Takaaki; Yamamoto, Takahiro*; Ishizuka, Yoshihiro*; Geshi, Nobuo*; Furukawa, Ryuta*; Nanayama, Futoshi*; Takata, Takashi*; Azuma, Emiko*

This paper describes mainly snow probabilistic risk assessment (PRA) methodology development in addition to the project overview. In snow hazard category, the accident sequence was evaluated by producing event trees which consist of several headings representing the loss of decay heat removal. Snow removal action and manual operation of the air cooler dampers were introduced into the event tree as accident managements. The snow PRA showed less than 10 $^{-6}$ /reactor-year of core damage frequency.

Language	:	English
Journal	:	Proceedings of 10th International Topical Meeting on Nuclear Thermal Hydraulics, Operation and Safety (NUTHOS-10) (USB Flash Drive)
Volume	:
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Pages	:	12 Pages
Publication Year/Month	:	2014/12
Meeting title	:	10th International Topical Meeting on Nuclear Thermal Hydraulics, Operation and Safety (NUTHOS-10)
Held date	:	2014/12
Location (city)	:	Ginowan
Location (country)	:	Japan
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Keywords	:	no keyword
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Article of JAEA R&D Review	:
Cooperating Institute	:	文部科学省

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Registration No. : BB20141592
JAEA Abstracts No. : 43000289
Paper Submission No. : 15412

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