ML19329F930

LER 80-022/03L-0:on 800603,reactor High Pressure Isolation Condenser Initiation Switch Trip Points Found Less Conservative than Specified.Caused by Unusual Svc Condition. Pressure Switches Reset & Exercised to Ensure Operation

ML19329F930
Person / Time
Site:	Oyster Creek
Issue date:	07/01/1980
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19329F927	List: ML19329F926 ML19329F930
References
LER-80-022-03L, LER-80-22-3L, NUDOCS 8007110373
Download: ML19329F930 (3)

Text

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--t c 1 :1 F --On -June 3.1980. while cerformino the isn12tinn ennaancer Anenmaetr t o i 3 i -l- - -sor Calibration and Test, the trio coints of 1 of the 4 reactne hinh l i

pressure isolation cencenser initiation switches were fnund en ha face -- - - 1 lo l4i I

- d o I &i+- conservative than that specified in T.S.2.3.9. Pressure switch RF-1RA I 1

- -i c i e s i which had the, laroest discrenancv. was fnund en *rin ne inAR neig in-  !

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liiol l The cause of this occurrence can be attrihnted en nnnenal carvica e n n a -- --- - I I

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Donald A. Ross 201-499-8784 NAME OF SoE8ARGn PwCNE: {

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yf Jersey Central Power & Light Company

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.N (4" () Madison Avenue at Pumh Bowl Road Mornstown, New Jersey 07960 (201)455-8200 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/80-22/3L Report Date July 1, 1980 Date of Occurrence June 3, 1980 identification of Occurrence Reactor high pressure isolation condenser initiation pressure switches RE-ISA, RE-ISB and RE-15C tripped at a value greater than that specified in the Technical Specifications, Section 2.3.5 This event is considered to be a recortable occurrence as defined in the Technical Specifications, paragraph 6.9.2.b. (1) .

Conditions Prior to Occurrence Reactor coolant temperature 157.l*F Mode switch in refuel

. Reactor water level 170" All control rods at '00' Source range monitor ~25 cps Description of Occurrence On Tuesday, June 3,1980, at approximately 1000 bcurs, while performing the "Isolat*on Condenser Automatic Actuation Sensor Calibration and Test",

the RE-15A, RE-158 and RE-15C trip points were found to be less conser-vative than that specified in the Technical Specifications. Surveillance test on the high reactor pressure switches for the isolation condenser system revealed the following data:

Pressure Switch Desired Setpoint Designation (Head Correction included) As Found As Left RE-15A 1068 1088 1066 RE-158 1068 1081 1068 RE-15C 1066 1077 1064 RE-150 1066 1066 1066 Jersey Central Power & Ught Company is a Member of the General Public UtMties System

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,=l' Reportable Occurrence No. 50-219/80-22/3L Page 2 July 1, 1990 Apparent Cause of Occurrence The cause of the occurrence can be attrituted to unusual service condition in that the instruments had effectively been out of service for approxi-mately 6 months. The instruments were last tested and calibrated on December 12, 1979 and were found to be operating properly. They had not been tested since the plant was shutdown on January 5, 1980; The instru-ments have been in a relaxed condition since then; except during the hydro-static test of the reactor pressure vessel (performed only 3 days before the test of the pressure switches), i t is noted that the instrument was operating within its design accuracy.

Analysis of Occurrence The safety significance of this event is considered minimal since the pres-sure switches would have actuated but at a higher setpoint. It should also be noted'that the pressure switches would not see this type of service condition during normal plant operation.

Corrective Action immediate corrective action was to reset the pressure switches to the desired setpoint and exercise the switches to insure proper operation. No further action is contemplated.

Failure Data Barksdale Switch #82T A12SS Proof 1800 psi Adjustable range.50-J200 psi N

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