ML20151C152

AO 50-219/74/7:reactor High Pressure Sensor RE03D Failed to Trip at Point Corresponding to Reactor Pressure of Less than or Equal to 1,060 Psig.Cause Being Investigated.Pressure Sensor Recalibr & Returned to Svc

ML20151C152
Person / Time
Site:	Oyster Creek
Issue date:	01/23/1974
From:	Rone A JERSEY CENTRAL POWER & LIGHT CO.
To:
References
AO-50-219-74-7, NUDOCS 8103040628
Download: ML20151C152 (2)

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4, OYSTER CREEK NUCLiiAR CENEllATING STATION s

FOPJ.ED RIVER, NEW JERSEY 08751-

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- Abnorcal Occurrnce -

P.* port No. 50 219/74/ 7 IDDITIPTCATION -

Violation' of the Technical specifiestic.u, paragraph 2.3.3 OF OCOJRRENCE:

failure. ! the RE03D reactor high pressure, sensor to trip at a point corresponding to"a reactor pressuro of $,1060 psig.

Tnis.cVent is cons'idored to be an abnor:31 o.currence w, de-fined in th' Technical Specifications, paragraph _ j J5A _.

e CONDITIONS PRIOR

'to Q CuaRENCE:-

_ Steady State / ower Routine finutdown P

Hot Stanocy

,' _, Operttion

_ Cold Shutdown

_ Load Chcages During.

. Refueling Sht:t?.cwn -

Routine her Operatien i

X:

Routine Startup

,_ Other (SpecifM

_ Operation Re#ctor Thermal Power.1980 Ust

. tilectrical Power.

- 342 1%

8 kocirculation Flow

- 27.8 X 10 lb/hr..

~ Renctor Pressur-

- 10'20 psig 1

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DESCRIPTIGi While performing a routino conthly survcillance test on the" 0F OCCUTf.EHL'd:

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reactor high pressure sensors, PIOFA, Fi,. C, and D,'it was oh-served that P103D tripped at 1073 psig. This is 7 psig above l.

its nore.k1 trip point of 1066 psig~which reflects a sensor head

' correction of 6 psig. Tao surveillcoce test. reiutts were sA i

follo.cs:

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As Found As Left Nomina 1 Trip l'oint T'rlp Point Trip Point PID3A 1067 palg 3067 psig'

'1068 p.=ig-PE03B 1068 pr.ig

. 2068 psig 1068 psig FIO3C

'1066 paig 1065 psig~

1066 psig R503D 1073 psig 1066 psig 1066 psig APPARENT CAUSE

" Design '

Procedure 0F OCCUF.PINCE:

Manufacture Unususi Scryics Condition-Inst ellation/

Inc. Environmental Construction-Component Failure Operator

_ Other' (Specity) g..,.

'Ihe resson for..the' ching.- in setpoint 1k. undcr. inver.tination.~

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4 ANALYSIS OF-The safoty sii;nificance of this. event lics.in.a loss of' system OCCURRENCB:

redundancy. Had ~a pressure excursion occurred, the redundant sensor, D103C,'would have ftmetioned propeefy and would have teminated the pressure transient in conjunction with the pro.

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psr actuation.of the RE03A and B sensors.

00P.PLCr1Yn The sensor was recalibrated and roturned to.scrvice.

ACT. 10.N :

Fall.UP.E < UATA:

Manufacturer: Barksdale

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