Closeout of IE Bulletin 83-04: Failure of the undervoltage trip function of reactor trip breakers

Technical Report · Fri May 01 04:00:00 EDT 1987

OSTI ID:6555279

Foley, W J; Dean, R S; Hennick, A

During shutdown of San Onofre units 2 and 3 on March 3 and 8, 1983, four General Electric (GE) Type AK-2 circuit breakers in the reactor protection systems (RPSs) failed to open on activation of the undervoltage trip coil during testing. Since issuance of IE Bulletin 79-09, April 17, 1979, on failures of GE Type AK-2 breakers, additional failures had been reported before the tests at San Onofre. Because of concern about continued failures of the subject breakers in RPSs, the NRC/IE issued IE Bulletin 83-04 on March 11, 1983. All licensees of operating pressurized water power reactors, except those with Westinghouse Type DB breakers, were required to take five specific actions. The bulletin was issued for information to all other nuclear power facilities. Evaluation of utility responses and NRC/IE inspection reports indicates that the bulletin can be closed out for all of the 50 facilities to which it was issued for action. Six plants had breakers which failed to operate satisfactorily during tests for bulletin requirements. There are no remaining areas of concern for this bulletin.

• Research Organization: Parameter, Inc., Elm Grove, WI (USA); Nuclear Regulatory Commission, Washington, DC (USA). Div. of Emergency Preparedness and Engineering Response
• OSTI ID: 6555279
• Report Number(s): NUREG/CR-4664; ON: TI87900684
• Country of Publication: United States
• Language: English

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ELECTRICAL EQUIPMENT
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