Closeout of IE Bulletin 79-09: failures of GE Type AK-2 circuit breakers in safety-related systems. Final report. [PWR; BWR]
Technical Report
·
OSTI ID:6112437
Twelve failures of General Electric Type AK-2 safety-related circuit breakers reported in 1975, 1978 and 1979 are described in IE Bulletin 79-09. Because of these failures, the bulletin was issued April 17, 1979 to require responses and specific actions by all licensees and holders of construction permits. The failures were attributed to either binding within the linkage mechanism of the undervoltage trip device and trip shaft assembly or faulty adjustment of that linkage mechanism. It was concluded that the twelve failures resulted from inadequate preventive maintenance. Because many occurrences of the same kind happened after 1979, a significant number of later NRC documents which are included in Appendix A were issued. The bulletin has been closed out for 101 of the 129 current facilities which reported either that they had no Type AK-2 breakers in safety-related systems or none with undervoltage trip devices. Proposed followup items for the remaining 28 current facilities are presented in Appendix C. Because followup is based on the requirements of later Bulletins 83-04 and 83-08, Bulletin 70-09 is considered closed.
- Research Organization:
- Parameter, Inc., Elm Grove, WI (USA)
- OSTI ID:
- 6112437
- Report Number(s):
- NUREG/CR-3791; ON: TI85900923
- Country of Publication:
- United States
- Language:
- English
Similar Records
Closeout of IE Bulletin 83-04: Failure of the undervoltage trip function of reactor trip breakers
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Closeout of IE Bulletin 83-01: Failure of reactor trip breakers (Westinghouse DB-50) to open on automatic trip signal
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Fri May 01 00:00:00 EDT 1987
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OSTI ID:6555279
Closeout of IE Bulletin 83-08: Electrical circuit breakers with an undervoltage trip feature in use in safety-related applications other than the reactor trip system
Technical Report
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Thu Mar 31 23:00:00 EST 1988
·
OSTI ID:5150616
Closeout of IE Bulletin 83-01: Failure of reactor trip breakers (Westinghouse DB-50) to open on automatic trip signal
Technical Report
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Fri May 01 00:00:00 EDT 1987
·
OSTI ID:6797247
Related Subjects
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
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CIRCUIT BREAKERS
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FAILURES
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REACTOR SAFETY
REACTORS
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US NRC
US ORGANIZATIONS
WATER COOLED REACTORS
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210100 -- Power Reactors
Nonbreeding
Light-Water Moderated
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210200 -- Power Reactors
Nonbreeding
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22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
BWR TYPE REACTORS
CIRCUIT BREAKERS
ELECTRICAL EQUIPMENT
ENGINEERED SAFETY SYSTEMS
EQUIPMENT
EQUIPMENT PROTECTION DEVICES
FAILURES
LICENSING
MAINTENANCE
MODIFICATIONS
NATIONAL ORGANIZATIONS
PWR TYPE REACTORS
REACTOR LICENSING
REACTOR MAINTENANCE
REACTOR SAFETY
REACTORS
SAFETY
US NRC
US ORGANIZATIONS
WATER COOLED REACTORS
WATER MODERATED REACTORS