ML19261D894

LER 79-018/03X-1 on 790414:main Steam Relief Valve 1B21-F013J Opened at 520 Psi During Plant Startup.Valve Immediately Reseated.Possible Cause May Be Excessive Pilot or Second Stage Seat Leakage

ML19261D894
Person / Time
Site:	Brunswick
Issue date:	06/26/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19261D893	List: ML19261D892 ML19261D894
References
LER-79-018-03X, LER-79-18-3X, NUDOCS 7906280088
Download: ML19261D894 (2)

Text

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"'[n"C 3o l L j@l 0 l 5 l 0 l - l 0 l 3 l 2 l 5 @l 014 l1 l 4 l 7 l 9 l@l 0l6l2 6l 7809lg 74 75 7 8 60 61 DOCKET NUMBER 68 69 EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 lDurine olant start-uo and nrosettri>neinn fn11nuing , vafitaling nitenga ,,4n acanm va-o 3 l lief valve 1B21-F013J. opened at 520 osi and immediate1v reseated. The setpoint for The result of this event was a reactor scen, dita en n O 4 Ithis valve is 1125 osi t 1%. 1 0 5 l high flux spike on the IRM's. I O 6 I (Technical Specifications 6.9.2.9b) l O 7 l l 0 8 l l 7 8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUSCODE COMPONENT CODE SU8 CODE SUSCODE 7

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lg j 0l 0l 4l 37 40 l lY g 41 lYlg 42 l Nl g 43 lT l0 l2 l0 lg 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o lThe valve actuator was removed and sent to Wyle Laboratories for repair by Target-Rock 4 gg Target-Rock attempted to determine the set pressure of the actuator, but could not dueI g lto excessive pilot leakage. The actuator was disassembled and the pilot disc, second l

,i 3 l stage disc, pilot seat, and second stage seat were all found to be steam cut. While l i 4 lno specific reason was found for the valve to open at 520 psi, it is suspected (Con't) 7 8 9 80 ST S  % POWER O THER STATUS DIS O RY DISCOVERY DESCRIPTION i s l C [@ l 0l 0[ 0l@l NA l l Al@l Reactor Scram l ACTIVITY CO TENT AMOUNT OF ACTIVITY LOCATION OF RELEASE 1 6 lZl RELEASE @D OF RELEASE lZ lg[NA l l NA l 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION 1 7 l0]0l0l@lZl@l HA l PERSONNEL INJURIES NUMBER DESCRIPTION 7

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LOSS OF OR OAMAGE TO FACILITY

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NAME OF PREPARER

LER CONTINUATION -- RO# 1-79-018 Facility: BSEP Unit #1 Event Date: 4-14-79 that excessive pilot and/or second stage seat leakage contributed to the leakage. The pilot and second stage seats and discs were resu-faced. The actuator was reassembled, tested, and reset to 1125 psi. Valve testing will continue in accordance with ISI : c quirements.

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