05000280/LER-1978-031-03, /03X-1 on 781001:during Normal Operation,Channel I Pressurizer Level (Protection) L-I-459 Drifted High.Caused by Drift of Electronic Zero Adjustment,In Conjunction W/ Leakage Thru Transmitter Bypass/Equalizing Valve

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/03X-1 on 781001:during Normal Operation,Channel I Pressurizer Level (Protection) L-I-459 Drifted High.Caused by Drift of Electronic Zero Adjustment,In Conjunction W/ Leakage Thru Transmitter Bypass/Equalizing Valve
ML18113A818
Person / Time
Site: Surry 
Issue date: 02/02/1979
From: Baucom T
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18113A817 List:
References
LER-78-031-03X, LER-78-31-3X, NUDOCS 7902060326
Download: ML18113A818 (2)
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LER-1978-031, /03X-1 on 781001:during Normal Operation,Channel I Pressurizer Level (Protection) L-I-459 Drifted High.Caused by Drift of Electronic Zero Adjustment,In Conjunction W/ Leakage Thru Transmitter Bypass/Equalizing Valve
Event date:
Report date:
2801978031R03 - NRC Website
v • d • e

text

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Surry PoHer Doc'.:et No: Report No: F>.,,~ n t D a t c~ : Station, Unit.l 50-280 n-031/03X**-1 11-11-78 Title of Report: Drift 1n Pressurizer Level Channel

1.

Description of_Event: Duricig normnl ope[r-1t:i0n, Channel I of the Pressuri.zr~.- L*,,vel (Protec-tion) instrum2ntation, L-1-1.,59, drifted h.i.gh. *This resulted jn tb~ inability c,f this ch.:mnel to snpply a reliable sigr,al of. lo~, pressurizer level to the Safety Injection 1 :)gics. The reqt1 ired d2g;-ee cf re,.lund;-,.ncy wns not maintained and this is contrc1ry to Tec:Jrnical Specifi.c,!tions

3. 7.H and is reportc,.bJ.e pe*;:- Technical Specificatic _ 6.6.J.h.(l).
2.

Prcibab le Conseque.r-:es a:':1 Status of _nedun<lnnt S:,::;te;,1:::_: Channel I Pressurizer level was put in the trip r.i.-.:ide. All other pressurizer level instrurnent;:,tion rcmo.ined operable. Because the r,'<1ui red immedinte corrective action,-,as tak~n and the de:>~ee of r,::dun -- c~.::ncy n'.g::iineJ, the henltii ar.1d safety of ths genc:rnl public we-.:-e not affected.

3.

Cauco:': The event was caused by drift of the electronic zero adjustment 1n conjunction with leakage through the transmitter's bypass/equalizing vnlvc.

4.

Im1~cdiate Corrective Action: Imm-2di2.te corrective action taken wa:~ to pluce Channel I Prcssuriz2;~ Level into the trip mod(!. This provided the n~quired degree of reclunclm,c:y in the pressurizer levei instrunrntation.

5.

Subsequent Corrective Action. Subsequently, the zero adjust inpnt voll.~ge,-,as checked and found to be high. Further inspection revealed a leak in the bypass e,1u.:.lizing valve. The valve was tightened and the transmitter was rezeroed. The channel was monitored to verify that the transmitter w2s not drifting. The channel was then returned to service.

6.

Actions Taken to Prevent Recurrence~ No further coriective action will be required. This event 1s con:~~ id ::~tc.:d ,~. rr~nd:-..*.~ c~\\:.*:r~t.

7.

Gene~ic Implications: None. It is considered a random event. }}

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