05000324/LER-1980-101-03, /03L-0:on 801115,reactor Core Isolation Cooling Turbine Tripped Due to High Turbine Exhaust Pressure.Caused by Turbine Exhaust Swing Check valve,2-E51-F040,failing in Closed Position.Valve Repaired

/03L-0:on 801115,reactor Core Isolation Cooling Turbine Tripped Due to High Turbine Exhaust Pressure.Caused by Turbine Exhaust Swing Check valve,2-E51-F040,failing in Closed Position.Valve Repaired

ML19345D662
Person / Time
Site:	Brunswick
Issue date:	12/11/1980
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345D660	List: 05000324/LER-1980-101, Forwards LER 80-101/03L-0 05000324/LER-1980-101-03, /03L-0:on 801115,reactor Core Isolation Cooling Turbine Tripped Due to High Turbine Exhaust Pressure.Caused by Turbine Exhaust Swing Check valve,2-E51-F040,failing in Closed Position.Valve Repaired
References
LER-80-101-03L, LER-80-101-3L, NUDOCS 8012160440
Download: ML19345D662 (2)

LER-1980-101, /03L-0:on 801115,reactor Core Isolation Cooling Turbine Tripped Due to High Turbine Exhaust Pressure.Caused by Turbine Exhaust Swing Check valve,2-E51-F040,failing in Closed Position.Valve Repaired

Event date:
Report date:
3241980101R03 - NRC Website

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8 60 61 OOCKET NyygER bd 63 EVENT OATE 74 76 REPORT OATE 80 EVENT DESCRIPTION AND PROe ABLE CONSEQUENCES h m l During the performance of RCIC System Cumponent Test. P.T. 10.1.la, the RCIC turbine 1 tripped due to high turbine exhaust pressure. The RCIC System was then declared l

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Unit No. 1 in October 1979 and was reported with LER 1-79-74.

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33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 lAn investigation revealed the RCIC turbine tripped on high exhaust pressure when the.

I i O l turbine exhaust swing check valve, 2-E51-F040, fr.iled in the closed position. The i

i i gvalve was then repaired, tested and the RCIC System vtzs returned to normal service.

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8 9 10 A. C. Tollison, Jr.

NAME OF PREPAH&H PHONE:

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i LER ATTACIIMENT RO # 2-80-101 I

i Facility: BSEP Unit No.

2 Event Date: 11-15-80 Inspection revealed the check valve disc stem had broken off where it connects to.the valve hinge assembly. This allowed the disc to fall into the discharge part of the valve and isolate flow. An examinatIion of the check valve disc and hinge assembly indicated the disc had been rotating inside of the hinge bore area and caused *xcessive wear *of both components.

In addition, indi-cations that the valve disc had been striking the upper part of the valve body while in the open position were noted. To return the check valve to normal operability the valve seat was lapped, the valve disc replaced, and the valve was tested satisfactorily. Plant Engineering is reviewing the possibility of modifying or replacing this valve with one of different design to help prevent future problems with this valve.

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