Aging and service wear of electric motor-operated valves used in engineered safety-feature systems of nuclear power plants. Volume 1
This is the first in a series of three reports on electric motor-operated valves (MOVs) to be produced under the US Nuclear Regulatory Commission's Nuclear Plant Aging Research program. This program addresses the evaluation and identification of practical and cost-effective methods for detecting, monitoring, and assessing the severity of time-dependent degradation (aging and service wear) of MOVs in nuclear plants. These methods are to provide capabilities for establishing degradation trends prior to failure and developing guidance for effective maintenance. This report examines failure modes and causes resulting from aging and service wear, manufacturer-recommended maintenance and surveillance practices, and measurable parameters (including functional indicators) for use in assessing operational readiness, establishing degradation trends, and detecting incipient failure. The results presented are based on information derived from operating experience records, nuclear industry reports, manufacturer-supplied information, and input from architect-engineer firms and plant operators.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6495622
- Report Number(s):
- NUREG/CR-4234-Vol.1; ORNL-6170/V1; ON: TI85013551
- Country of Publication:
- United States
- Language:
- English
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Aging and service wear of electric motor-operated valves used in engineered safety-feature systems of nuclear power plants: Aging assessments and monitoring method evaluations
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Related Subjects
ENGINEERED SAFETY SYSTEMS
VALVES
NUCLEAR POWER PLANTS
FAILURE MODE ANALYSIS
PERFORMANCE
AGING
ELECTRIC MOTORS
MAINTENANCE
OPERATION
SERVICE LIFE
SURVEILLANCE
WEAR
CONTROL EQUIPMENT
EQUIPMENT
FLOW REGULATORS
MOTORS
NUCLEAR FACILITIES
POWER PLANTS
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
THERMAL POWER PLANTS
220900* - Nuclear Reactor Technology- Reactor Safety