ML19312E192

LER 80-016/01T-0:on 800512,util Recognized That 800420 Discovery of Defective Pressure Switch,Psl D,Constituted Immediate Rept.Caused by Cocked Teflon Actuator.Switch Removed & Will Be Replaced

ML19312E192
Person / Time
Site:	Oyster Creek
Issue date:	05/23/1980
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19312E189	List: ML19312E188 ML19312E192
References
LER-80-016-01T, LER-80-16-1T, NUDOCS 8006030450
Download: ML19312E192 (3)

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REPCRT DATE EVEN T DESCRIPTION AND PROB ABLE CONSEQUENCES h e ::J [ On April 20, 19S0, while performing surveillance on generator load re- l 0 63; j jection sensors, pressure switch PSL "D" was found defective. Investi-  ;

o i4 ; } gation revealed that the pressure switch would not have tripped at any l

;s; ; pressure due to a nislocated operating lever within the switch housing. l

- , , , , The suitch was considered to have been inoperable between the date of the I

..,,,; inst surveillance, 12/:'0/79, and 1/5/50 when the 19S0 refueling outage began. Redundant pressure switches were found to be fully operable. .

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..,..c' T) Maison Avenue at Punch Bowl Ficac "2 Momstown, New Jersey 07960 (201)455-8200 OYSTER CREEK NUCLE /a GENERATING STATION Forked River, New Jersey OS731 Licensee Even: Report Reportable Occurrence Nc. 50-219/S0-16/1T Rcport Date May 23, 19S0 Occurrence Date 1

av 12, 19S0 l 1

1 Identification of Occurrence 1 1

1 1

Exceeding a limiting condition for operation as per Technical Specifications, paragraph 3.1.A.2, (Table 3.1.1-Item A12) when pressure switch PSL "D" was i found defective and inoperable. l This event is considered to be a reportable occurrence as defined in the Techni-cal Specifications, paragraph 6.9.2.a.2.

Conditions, Prior to Occurrence The plant was shutdown for a refueling / maintenance outage.

The reactor was suberitical.

The reactor mode switch was locked in refuel.

The reactor cavity was flooded.

Description of Occurrence On April 20, 19SO, while performing surveillance on generator load rejection sunsors, pressure switch PSL "D" was found defective. Investigation revealed that the pressure switch would not have tripped at any pressure due to a nis-located operating lever withia the switch hcusing. On May 12, 1980 during a review of a preliminary report, it was recogniced that this event constituted m it..ediate report.

Su veillance procedure records indicate the PSL "D" switch performed satisfc.c-

rrily on 12/2C!79 when the last strveillance test was performed. Therefore, f.e switch is ccnsidered to have been inoperable betweer 12/20/79 and 1/5/SO the 19S0 Refueling Outage began.

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Reportable Occurrence No. 50-219/80-16/1T Page 2

May 23, 19S0 i During the surveillance performed cn14/20/E0, the redundant pressure switch PSL "B" in the same trip channel was found fully operable as well as the two

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j redundant sensors, PSL "A" and "C" in the independent trip channel.

Arnarent Cause of Occurrence The cause of this occurrence is attributed to component failure.

1 1

Analysia of Occurrence The generator load rejection sensors are pressure switches sensing hydraulic oil pressure on the turbine acceleration relay. There are four sensors; two redundant sensors in each of two independent trip channels.

', The function of these sensors is to provide an anticipatory scram signal when load is rejected from the generator to minimi:e reactor pressurization transi-ents. The safety significance of the failed sensor is considered minimal rince l the redundant trip channel sensor was cpecabic and the independent trip channel was operable. Therefore, the trip function was not lost and a scram would have resulted if a generator load rejection had occurred.

4 i Corrective Action

, The defective pr, essure switch was disassembled and inspected, it was found that a teflon actuator that activates the switch was cocked and caused the failure.

4 The actuators on the other svi:ches were checked te verify that this condition i did not exist.

Since the plant was shutdown for a refueling outage, the switch was removed and l will be replaced with a new switch prior to plant startup.

Failure Data

, Penn Controls, Inc.

Pent. Seitch Model Number P72AA-15

Serial Number 570 Range 50 to 240 PSI Setting

150 PSI (Decreasing Pressure) 3 r

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