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Is a 4-train support ''always'' more reliable than a 2-train support [electronic resource].

Published
Upton, N.Y. : Brookhaven National Laboratory, 1986.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 6 : digital, PDF file
Additional Creators
Brookhaven National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Once the gross features of a frontline fluid system have been defined, one must consider what support system configuration will provide the best overall system performance. This paper considers different dc bus configurations for a given emergency feedwater system. Results indicate that a four-train support system (i.e., 4 dc buses) gives a lower system unavailability for transients, but a higher system unavailability for Anticipated Transients Without Scram (ATWS), than a two-train support system (i.e., two dc buses). This serves to illustrate that more trains do not necessarily provide higher reliability, and that a configuration choice which is better for one mission success criterion may be worse for another. Because of the small characteristic unreliability of dc buses, the numerical comparisons made here are not dramatic, but the underlying topological point is nevertheless broadly applicable. The EFWS selected in this study consists of two turbine-driven pumps, and two motor-driven pumps, with associated piping, instruments, and valves. There are two divisions of EFWS, each division including one turbine-driven pump train, and one motor-driven pump train with a crosstie that can provide an alternate flow path in case one train is not available. Each of the motor-driven pumps has one ac power bus associated with it. No ac power is required for the turbine-driven trains.
Report Numbers
E 1.99:bnl-nureg-38378
bnl-nureg-38378
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
06/01/1986.
"bnl-nureg-38378"
"TI86014765"
Youngblood, R.; Guey, C.N.; Arrieta, L.
Funding Information
AC02-76CH00016
View MARC record | catkey: 14366226