ML20107B031

Preliminary AO Rept 73-23:on 730924,failure of Differential Pressure Switch DPS 66A to Trip & Thereby Actuate Reactor Building to Torus Vacuum Breaker Block values,V-26-16-18

ML20107B031
Person / Time
Site:	Oyster Creek
Issue date:	09/25/1973
From:	Carroll J, Reeves D JERSEY CENTRAL POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18039A986	List: IR 05000219/1970007 IR 05000219/1971001 IR 05000219/1971002 IR 05000219/1971003 IR 05000219/1971004 IR 05000219/1971005 IR 05000219/1972001 IR 05000219/1972002 IR 05000219/1972003 IR 05000219/1972004 IR 05000219/1972005 IR 05000219/1972013 IR 05000219/1972025 IR 05000219/1973003 IR 05000219/1973004 IR 05000219/1973006 IR 05000219/1973007 IR 05000219/1973008 IR 05000219/1973009 IR 05000219/1973010 IR 05000219/1973011 IR 05000219/1973012 IR 05000219/1973013 IR 05000219/1973014 IR 05000219/1973015 IR 05000219/1973016 IR 05000219/1973017 IR 05000219/1973019 IR 05000219/1973020 IR 05000219/1973021 IR 05000219/1973022 IR 05000219/1973023 IR 05000219/1974001 IR 05000219/1974002 IR 05000219/1974003 IR 05000219/1974004 IR 05000219/1974005 IR 05000219/1974006 IR 05000219/1974007 IR 05000219/1974008 IR 05000219/1974009 IR 05000219/1974010 IR 05000219/1974011 IR 05000219/1974012 IR 05000219/1974013 IR 05000219/1974014 IR 05000219/1974015 IR 05000219/1974016 IR 05000219/1974017 IR 05000219/1974018 ... further results
References
FOIA-95-258 AO-73-23, NUDOCS 9604150301
Download: ML20107B031 (3)

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,y Operations James P, O'ReillyDirectorate of Hagulatory 00:-

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1. 50-219 Company Docket Jersey Central Power 6 Lightting Station Dyster Creek Nuclear Genera 08731 w Jersey Front Forked River, Ne i

73-23 nce Report No.

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submitted in Preliminary #snormal occurrea prelim i

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Subject:

The following is with the Technical Spec 3

comp 11ance 6.6.2.

Prelialnary Approval:

[r9/25/73 l

/a Date J. T. Carroll, Jr Mr. A. Gianbusso cc:

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Time: 2:40 p.m.

Preliminary Abnormal Occurrence Report No. 73-23 SulkiELT:

Failure of Differential Pressure Switch 0P3 66A to trip add j

i thereby actuate the reactor building to torus vacuum breaker block valves, Y-26-16 and 18 j

This event is considered to be an abnormal occurrence as de.

fined in the Technical Specifications, pai; graph 1.150.

Notification of this event a$ nquired by the Technical Spec-ifications, paragraph 6,6,2,a, was made to AEC Region I, Directorate of Regulatory Operations by telephone on Monday, September 24,1973, at 6:00 p.m., 'and by telecopier on Tuesday, j

1 September 25, 1973, et 3:00 p.m.

i SITUATION:

While performing routine surveillance testing as required by l

the Technical specifications, paragraph 4.5.1.5, Rifferential Pressure Switch DPS 66A failed to trip.

j CAUS!!:

Excess friction in the leakage pivots.

i REWiDIAL ACf10N:

The switch was removed, disassembled and cleaned. After re-assembly and installation, the unit was natisfactorily trip tested twenty (20) times and returned to service.

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Abnormal Occurrence

.I Septcaber 22, 1973 Report No. 73 23 SAFRTY _ SIGNIFICANCE:

As noted in the Technical specifications, "ihe shsorption cham.

bcr-reactor building vacuum relief system assures that the prl-mary containment is not operated at a negative pressure relative to Its surroundings... The vacuum relief system is a redun-dant system and full capacity is available through either velve."

Further, the differential pressure switches are themselves redundant in that either pressure switch will actuate both block valves.

In this case, since one of the switches was operabic, full relief capacity would have been provided through either valve since both would have been availabic. The significance of t.his event then is tho ioss of redundancy of the actuating switches.

Prepared by:

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