ML19350A355

LER 81-017/03L-0:on 810207,analog Rod Position Indicator Channels H2 & B8 & Associated Rods Were Declared Inoperable When Indications Exceeded Tech Spec.Caused by non-linearity in Indicator Calibr Curves.Tech Spec Mod Proposed

ML19350A355
Person / Time
Site:	Beaver Valley
Issue date:	03/06/1981
From:	Lacey W DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19350A356	List: ML19350A355 ML19350A359 ML19354C442
References
LER-81-017-03L, LER-81-17-3L, NUDOCS 8103130606
Download: ML19350A355 (2)

Text

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"'TC! I L @l o l' 5 I o 10 Io 13 I 3 !.4 'GI O I 2 I o l 7l 81 11@l0 i31016 I 00 et DocmET NunseER 44 es Eb EN r CATE 34 IS REPORT DATE 80 EVENT DESCRIPTION ANO PR08ASLE CCNSEQUENCES h gTTT I At 2010 hours0.0233 days <br />0.558 hours <br />0.00332 weeks <br />7.64805e-4 months <br /> following a Bank D insertion to 195 steps, analog rod position I indicator (ARPI) channels 112 and B8 indicated greater than 12 steps f rom demand. l gl for 112 indicated a possible rod I 1 o I 41 l When the backup primary voltage measurement l

Q l misalignment, the channel and associated rod were declared inoperaole as per g l Technical Specifications 3.1.3.1 and 3.1.3.2. Bv 9001 hours0.104 days <br />2.5 hours <br />0.0149 weeks <br />0.00342 months <br /> on 2/8/81 after a I

l f o e il I partial Bank D withdrawal, both ARPI and primary voltage indication were within I

Io is i i the 12 step upper limit. 80 7 8 9 CAUSE CO9P. VALVE svSTEW CAUSE SV8 CODE SusCODE COOL CODE SusCCOE COMPONENT CCDE loisi 4

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 1 i 1 o i l This incident resulted from the non-linearity in the ARPI calibration curves and l I

' IeiiII not due to actual rod misalignment. A proposed Technical Specification chance y,;,,l vould increase the allowed operating band of the ARPIs while still maintaining l

i,,,, l peaking f actors within those assumed in the safety analysis.

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! Attachment To LER 81-17/03L Beaver Valley Power Station i i

Duquesne Light Company i l Docket No. 50-334 No further information is available or needed to satisfy the reporting requirement.

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