ML19323H658

LER 80-018/03L-0:on 800507,during Monthly Surveillance Testing of Reactor High Pressure Scram sensors,RE03D Found to Be Less Conservative than Specified.Caused by Sensor Repeatability.Sensor Reset

ML19323H658
Person / Time
Site:	Oyster Creek
Issue date:	06/05/1980
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19323H655	List: ML19323H654 ML19323H658
References
LER-80-018-03L, LER-80-18-3L, NUDOCS 8006160021
Download: ML19323H658 (3)

Text

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!: i: i I On May 7, 1980, while cerformina monthly surveillance testino of the l 60 3, I reactor high oressure scram sensors, RE030 was found to be less conserv- I i3 ij i ative than specified in the Technical Specifications. The safety I j e is; ; significance of this event is considered minimal since RE030 would have i ge,a , actuated, but rt a pressure 9 psig higher than the crescribed value of l

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j iail The cause of switch RE03D tricaine at 1075 osia is attributed to sensor I l .ij i repeatabliity. The reactor high oressure scram senser was reset to trio with- t

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• ,' F Mad: son kvenLe at PurCrecM Pead Morns:Cwn New Jersey 07360 201 539-6111 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Recortable Occurrence No. 50-219/80-18/3L Recort Date June 5, 1980 Occurrence Date May 7, 1980 identification of Occurrence Reactor High Pressure Sensor RE030 trip setting was discovered to be greater than 1060 PSI.

This event is cons:dered to be a reportable occurrence as defined in the Techni-cal Specifications, paragraph 6.9.2.b.1.

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

The reactor cavity was flocded.

The reactor was subcritical.

The reactor mode switch was locked in the SHUTDCWN position.

Descriotion of Occurrence On Wednesday, May 7, 1980, at approximately 0117 hours0.00135 days <br />0.0325 hours <br />1.934524e-4 weeks <br />4.45185e-5 months <br />, while performing mc.'thly surveillance testing of the reactor high pressure scram sensors, RE030 was f ound to be less conservative than that specified in the Technical Specifications.

Tests on all reactor high pressure switches revealed the following data: .

Pressure Switch Desired Desionation Set Point As Found As Left System 1 RE03A 1068 1066 1066 RE03C 1066 1066 1066 System 2 RE038 1068 1068 1068 1066 RE030 1075 1066 Jersey Ce-trai Power & Lg-t Ccmea y s a vem:er cf " e Gereal muche '.;tir es System

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Repor' table Occurrence No. 50-219/80-18/3L Page 2 June 5, 1980 Aooarent Cauce of Occurrence The cause of switch RE030 tripping at 1075 PSIG is attributed to sensor repeat-ability.

Analysis of Occurrence RE03D pressure switch would have actuated but at a pressure 9 PSIG greater than ,

it's prescribed value of 1066 PSIG. The only safety significance of this event

was the loss of redundancy in the pressure switch actuation at the prescribed set point.

j Corrective Action Reactor high pressure sensor RE030 was reset to trip within the prescribed limits.

i Failure Data Barksdale Pressure Actuated Switch Switch #82T-Al2SS Proof 1800 PSI l

Adjustable Range 50-1200 PSI i

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