05000325/LER-1979-098-01, /01T-0:on 791115,steam Exhaust Check Valve F040 Failed Leak Test.Caused by Sheared Bolt & Nut Lodged in Seat of Reactor Core Isolation Cooling Steam Exhaust Isolation Valve F001.Bolt & Nut Removed.Leak Test Successful

/01T-0:on 791115,steam Exhaust Check Valve F040 Failed Leak Test.Caused by Sheared Bolt & Nut Lodged in Seat of Reactor Core Isolation Cooling Steam Exhaust Isolation Valve F001.Bolt & Nut Removed.Leak Test Successful

ML19210E630
Person / Time
Site:	Brunswick
Issue date:	11/28/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19210E628	List: 05000325/LER-1979-098, Forwards LER 79-098/01T-0 05000325/LER-1979-098-01, /01T-0:on 791115,steam Exhaust Check Valve F040 Failed Leak Test.Caused by Sheared Bolt & Nut Lodged in Seat of Reactor Core Isolation Cooling Steam Exhaust Isolation Valve F001.Bolt & Nut Removed.Leak Test Successful
References
LER-79-098-01T, LER-79-98-1T, NUDOCS 7912050438
Download: ML19210E630 (2)

LER-1979-098, /01T-0:on 791115,steam Exhaust Check Valve F040 Failed Leak Test.Caused by Sheared Bolt & Nut Lodged in Seat of Reactor Core Isolation Cooling Steam Exhaust Isolation Valve F001.Bolt & Nut Removed.Leak Test Successful

Event date:
Report date:
3251979098R01 - NRC Website

text

(7 77)J LICENSEE EVENT REPORT CONTROL BLOCK: l l

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l lh (PLCASE PRINT OR TYPE ALL REQUIRED INFORMATIONI I

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60 61 DOCKET NUM8ER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h g

On October 19, 1979, the RCIC turbine failed to start due to a sheared bolt on the l

g l steam exhaust check valve F040 (LER 1-79-74).

The unit resumed power operation with l

lthe RCIC system under an LCO condition while avaiting repair parts.

On November 15 j

o,

p;;7;p 1979, the valve was repaired and a leak test was performed. A pressure could not be l

g [ maintained during this leak rate test.

l ITTT1i Technical Specifications 3.6.1.2b, 6.9.1.8b l

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CODE TYPE No.

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JJ 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h Li_LO_j lAn investigation revealed that the sheared bolt and its accompanving nut had become I

l lodged in the seat of the RCIC steam exhaust isolation valve F001. The bolt and nut l

i,

l vere removed, the valve seat and disk were inspected for damage (none was found), and l lthe leak rate test completed satisfactorily. As in this event, an extensive effort l

gwill be made to locate all missing parts on any future event.

(Cont'd) l 7

8 9 80 ST S

% POWER OTHER STATUS DIS RY DISCOVERY DESCRIPTION

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919 - 457-9521 NAME OF PREPARER PHONE:

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LER CONTINUATION - RO# 1-79-98 Facility:

BSEP Unit No. 1 Event Date:

11-15-79 An engineering review of any missing part not located will be performed on any containment or safety system before operation of that system or associated systems is allowed. Maintenance

• procedures will be revised to address these actions.

1494 261 e

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