Long-term performance of motor-operated valves

Conference · Sun Dec 01 04:00:00 EST 1996

OSTI ID:402024

Scarbrough, T G

The U.S. Nuclear Regulatory Commission (NRC) requires that motor-operated valves (MOVs) important to safety be designed, fabricated, erected, and tested to quality standards commensurate with the importance of the safety functions to be performed. Despite these requirements, operating experience and research revealed problems with the performance of MOVs in operating nuclear power plants. In response to the concerns about MOV performance, the NRC issued Generic Letter (GL) 89-10, {open_quotes}Safety-Related Motor-Operated Valve Testing and Surveillance,{close_quotes} and its supplements. Most licensees have completed the aspects of their GL 89-10 programs associated with the review of MOV design bases, verification of MOV switch settings initially, testing of MOVs under design-basis conditions where practicable, and improvement of evaluations of MOV failures and necessary corrective action. Licensees are establishing processes to ensure that the long-term aspects of their MOV programs, such as periodic verification of MOV capability and the trending of MOV problems, are maintained. The NRC staff is developing a generic letter to address periodic verification of MOV design-basis capability.

• Research Organization: American Society of Mechanical Engineers, New York, NY (United States)
• OSTI ID: 402024
• Report Number(s): NUREG/CP--0152; CONF-9607103--; ON: TI96013645
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
ACTUATORS
ELECTRIC MOTORS
HISTORICAL ASPECTS
NUCLEAR POWER PLANTS
OPERATION
PERFORMANCE
VALVES