Atmospheric dump valve engineering analysis
This report documents the activities undertaken after the atmospheric dump valves (ADVs) failed to operate following a Unit 3 reactor trip. The activities consisted of testing valves in all three units, examining Palo Verde Nuclear Generating Station (PVNGS) history with the valves, determining causes for failures, and making recommendations. The PVNGS engineering departments performed an in-depth review of the history, operation, maintenance, and design of ADVs. A preliminary mathematical model of the valves' dynamic behavior was developed by Arizona State University. The corrective actions are designed to eliminate the anomalies noted with the Unit 1 and 3 ADVs. Subsequent monitoring and testing activities following the planned modifications will ensure the ADVs remain operable during modes required by the PVNGS technical specifications. Through this increased monitoring and testing program, the valve modifications will be evaluated to confirm that the required level of reliability has been reached for the ADVs. The specific failures have been evaluated and the causes determined.
- OSTI ID:
- 7088683
- Report Number(s):
- CONF-901101-; CODEN: TANSAO
- Journal Information:
- Transactions of the American Nuclear Society; (United States), Vol. 62; Conference: American Nuclear Society (ANS) winter meeting, Washington, DC (United States), 11-16 Nov 1990; ISSN 0003-018X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Palo Verde full-range feedwater control system operating experience
Atmospheric dump valve control for LOSP event mitigation
Related Subjects
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
PALO VERDE-1 REACTOR
REACTOR SAFETY
RHR SYSTEMS
PALO VERDE-2 REACTOR
PALO VERDE-3 REACTOR
VALVES
CONTROL SYSTEMS
AFTER-HEAT REMOVAL
CONTROL ROOMS
FAILURES
LEAKS
PERFORMANCE
PNEUMATIC CONTROLLERS
REACTOR OPERATION
REMOTE CONTROL
REPORTING REQUIREMENTS
SCRAM
SEALS
SURVEILLANCE
US NRC
CONTROL
CONTROL EQUIPMENT
COOLING SYSTEMS
ENRICHED URANIUM REACTORS
EQUIPMENT
FLOW REGULATORS
NATIONAL ORGANIZATIONS
OPERATION
POWER REACTORS
PWR TYPE REACTORS
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTOR SHUTDOWN
REACTORS
REMOVAL
SAFETY
SHUTDOWN
THERMAL REACTORS
US ORGANIZATIONS
WATER COOLED REACTORS
WATER MODERATED REACTORS
220900* - Nuclear Reactor Technology- Reactor Safety
210200 - Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled