Modeling operator actions during a small break loss-of-coolant accident in a Babcock and Wilcox nuclear power plant [electronic resource].

Published:: Rockville, Md. : U.S. Nuclear Regulatory Commission, 1991.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: 12 pages : digital, PDF file
Additional Creators:: U.S. Nuclear Regulatory Commission and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

A small break loss-of-accident (SBLOCA) in a typical Babcock and Wilcox (B&W) nuclear power plant was modeled using RELAP5/MOD3. This work was performed as part of the United States Regulatory Commission`s (USNRC) Code, Scaling, Applicability and Uncertainty (CSAU) study. The break was initiated by severing one high pressure injection (HPI) line at the cold leg. Thus, the small break was further aggravated by reduced HPI flow. Comparisons between scoping runs with minimal operator action, and full operator action, clearly showed that the operator plays a key role in recovering the plant. Operator actions were modeled based on the emergency operating procedures (EOPs) and the Technical Bases Document for the EOPs. The sequence of operator actions modeled here is only one of several possibilities. Different sequences of operator actions are possible for a given accident because of the subjective decisions the operator must make when determining the status of the plant, hence, which branch of the EOP to follow. To assess the credibility of the modeled operator actions, these actions and results of the simulated accident scenario were presented to operator examiners who are familiar with B&W nuclear power plants. They agreed that, in general, the modeled operator actions conform to the requirements set forth in the EOPs and are therefore plausible. This paper presents the method for modeling the operator actions and discusses the simulated accident scenario from the viewpoint of operator actions.

Report Numbers:

E 1.99:egg-m--91372
E 1.99: conf-9111124--5
conf-9111124--5
egg-m--91372

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Note:

Published through SciTech Connect.
12/31/1991.
"egg-m--91372"
" conf-9111124--5"
"DE92011141"
1991 RELAP5/TRAC-B international users seminar,Baton Rouge, LA (United States),4-8 Nov 1991.
Ortiz, M.G.; Ghan, L.S.
EG and G Idaho, Inc., Idaho Falls, ID (United States)

Funding Information:

AC07-76ID01570

View MARC record | catkey: 14359405