05000334/LER-1981-018-03, /03L-0:on 810208,analog Rod Position Indicator Channels H2,P8,F10 & K10 Exceeded Tech Specs.Caused by Loss of Indicator Accuracy in Calibr Curves Region.Tech Spec Mod Proposed

/03L-0:on 810208,analog Rod Position Indicator Channels H2,P8,F10 & K10 Exceeded Tech Specs.Caused by Loss of Indicator Accuracy in Calibr Curves Region.Tech Spec Mod Proposed

ML19350A359
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: 05000334/LER-1981-017-03, /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 05000334/LER-1981-018-03, /03L-0:on 810208,analog Rod Position Indicator Channels H2,P8,F10 & K10 Exceeded Tech Specs.Caused by Loss of Indicator Accuracy in Calibr Curves Region.Tech Spec Mod Proposed ML19354C442
References
LER-81-018-03L, LER-81-18-3L, NUDOCS 8103130611
Download: ML19350A359 (2)

LER-1981-018, /03L-0:on 810208,analog Rod Position Indicator Channels H2,P8,F10 & K10 Exceeded Tech Specs.Caused by Loss of Indicator Accuracy in Calibr Curves Region.Tech Spec Mod Proposed

Event date:
Report date:
3341981018R03 - NRC Website

text

W 78 LICENSEE EVENT REPORT 1,

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(PLEAsE PalNT OR TYPE ALL REQUlEED INFORMATIONI cmeTRot.stOct:

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e e0 48 OoCKET waseeR ed 69 Ew E'er DATE J4 FS REPORT 0 ATE 80 EVENT DESCRIPTION AND PR0 saute CONSEQUENCES h Q l At 081$ hours following a Bank D insertion to 190 steps due to a positive delta l

I flux, analog rod position l'ndicator (ARPI) channels !!2, P8, F10 and al0 indicated l

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g l greater than 12 steps from demand. They and the associated Bank D rods were l

I dec'lared inoperable as per Technical Specifications 3.1.3.1 and 3.1.3.2.

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A l This incident is attributed to the loss of ARPI accuracy in the region of their to actual i

g l calibration curves corresponding to a rod position of 190 steps and not my { rod misalictunent. A proposed Technical Specification change would increase the i

g l allowed operating band of the ARPIs while still tnaintaining peaking f *ctors within l i

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q Attachment To LER 81-1P,/03L l

Beaver Valley Powar Station i

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Duquesne Light Company i

i Docket No. 50-334 I

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