ML20027B265

LER 82-051/03L-0:on 820809,reactor Core Isolation Cooling Steam Line High Pressure Differential Indicating Switch PDIS-2442 Tripped Out of Spec at 98 Inches of Water.Caused by Instrument Drift.Switch Recalibr & Tested

ML20027B265
Person / Time
Site:	Duane Arnold
Issue date:	09/08/1982
From:	Hill K IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20027B261	List: ML20027B259 ML20027B265
References
LER-82-051-03L, LER-82-51-3L, NUDOCS 8209160593
Download: ML20027B265 (1)

Text

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7 8 to se et EvtNT DA12 EVENT DESCRIPTION ANO #MOSASLE CCNSECUENCES 10 lo i 21 DI uring normal operation survei.llance testing, Reactor Core Isolation Coo I ggling (RCIC) steam line high pressure differential indicating switch PDIS - 1 ro,Ai -2442 tripped out-of-spec at 98 inches of water. Technical Specification I

,o,3i iTable 3.2-B requires the setpoint to be 110 +/- 5 inches of water. Redun I

,o is i [ dant switch PDIS-2441 was operable. There have been seven previous simil I t o ( 7 l lar occurrences. (See RO 77-52, 77-93. 79-30, 81-23, 82-02, 82-24, and 8 I I

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li i o l l Instrument drift. The switch was promptly recalibrated tested and found I l iii tsatisfactory. PDIS-2442 is a Barton model 288A pressure differential swi I i, ,3 [I tch. A design change is in proaress to replace PDIS- 2442 and PDIS 2441 I y l with similar switches with a smaller rance to reduce drift oroblems. Th I g i e new switches will be installed within 60 days of their receipt. I a i so A %PowtR CTwemSTATV$ DisCC Av OtSCCv 8Av 005CMiPTieN IiI5I l E.j @ l01 7I 9l@ l NA l [,B_J@lSurveil1anceTest l A vtTV CONTENT agtg43gO co astgAsg AMOUNT C# ACT1vtTY LOCATICN CP RtLEASE l1 l6l l NA l l NA l F S 10 tI a. 6 44

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