Protection system modifications in Westinghouse pressurized water reactors to reduce the frequency of unnecessary feedwater-related trips
The Westinghouse Owners' Group (WOG) established its Trip Reduction and Assessment Program (TRAP) in June 1985 in response to a goal announced by the Nuclear Management and Resources Council (NUMARC-an industry oversight group) to achieve a significant reduction in unnecessary reactor trips. A review of operating experience between 1979 and 1985, at Westinghouse-supplied plants, revealed that the largest number of automatic reactor trips ({approximately}40%) was associated with the feedwater system. Therefore, the WOG TRAP sponsored several feasibility studies to identify and estimate possible sources of margin, which could be applied to reduce the frequency of unnecessary feedwater system-related reactor trips. Two approaches were identified. The first approach automatically adjusts the allocation of instrument uncertainties in the low-low-level trip setpoint, while the second approach effectively reduces the setpoint safety analysis limit (i.e., before uncertainties are added) at low-power levels.
- OSTI ID:
- 6922926
- Report Number(s):
- CONF-890604--
- Journal Information:
- Transactions of the American Nuclear Society; (USA), Journal Name: Transactions of the American Nuclear Society; (USA) Vol. 59; ISSN TANSA; ISSN 0003-018X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
210200 -- Power Reactors
Nonbreeding
Light-Water Moderated
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22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
ACCIDENTS
BOILERS
CALIBRATION
COOLING SYSTEMS
ENERGY SYSTEMS
FEEDWATER
HUMAN FACTORS
HYDROGEN COMPOUNDS
MODIFICATIONS
OPERATION
OXYGEN COMPOUNDS
PERSONNEL
PWR TYPE REACTORS
REACTOR ACCIDENTS
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTOR INSTRUMENTATION
REACTOR OPERATION
REACTOR OPERATORS
REACTOR PROTECTION SYSTEMS
REACTOR SHUTDOWN
REACTOR START-UP
REACTORS
SCRAM
SHUTDOWNS
START-UP
STEAM GENERATORS
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
TIME DELAY
TRANSIENTS
VAPOR GENERATORS
WATER
WATER COOLED REACTORS
WATER MODERATED REACTORS
WESTINGHOUSE STANDARD REACTOR