ML20076E426
| ML20076E426 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 05/19/1983 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Allan J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 2NRC-3-032, 2NRC-3-32, 82-04, 82-4, NUDOCS 8306010092 | |
| Download: ML20076E426 (3) | |
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4 2NRC-3-032 (412)787 - 5141 Telecopy NJclear Construction Division May 19,1983 Robinson Plaza, Building 2 Suite 210 Pittsburgh, PA 15205 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 ATTENTION:
Mr. J. Allan Act ing Administrator
SUBJECT:
Beaver Valley Power Station - Unit No. 2 Do cke t No. 50-412 Pot ent ial Deficiency of Westinghouse Solid State Pr ot ect io n System Significant Deficiency No. 82-04 Gentlemen:
The at t ached repo rt, " Interim Report No.
2 on the Pot ent ial Deficiency of Wes t inghouse Solid State Prot ect ion System," is submi t t ed pursuant to the requirements of 10CFR50.55(e).
Wes t inghou se is still reviewing proposed design changes of the on-line tes t circuitry design of the Solid State Prot ect ion System.
When details of the corrective act ion are available, Duquesne Light Company will issue another report on this cubject.
It is expect ed that this report will be issued to the Region 1 Office by July 31, 1984.
DUQUESNE LIGHT COMPANY By E. F. Woolever Vice President JMM/wjs At t achment cc:
Mr. R. DeYoung, Director Of fice of Inspect ion and Enforcement (3) (w/a)
NRC Document Control Desk (w/a)
Mr. G. Walton, NRC Res ident Inspector (w/a)
Ms. L. Lazo, Project Manager (w/a)
INPO Records Center (w/a)
SUBSCRIBED AND SWORN TO BEFORE ME THIS
/ 42 DAY OF Mm
, 1983.
{} A O k a ' h e Not ary Public ANi. A rissuu kiisu, NCIre,/ F JbuJ ROBINSON TOWNSHIP, ALLEGHENY COUNTY 5 i 3306010092 830519 MY COMMIS$lCN EXP!RES OCTOBER 20,1986 PDR ADOCK 05000412 S
PDR 76.tl
a United States Nuclear Regulatory Commission Mr. J. Allan page 2 COMMONWEALTH OF PENNSYLVANIA )
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COUNTY OF ALLEGHENY
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On this
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, before me, a Notary Public in and for said <rCommonweal t h and County, pe rsonal ly a p pe ared ' E. J.
Wooleve r, dio being duly sworn, deposed and said that (1) he is Vice President of Duquesne Light, (2) he is duly authorized to exe-cute and file the foregoing Submit tal on behalf of said Company, and (3) the statements set forth in the Submittal are true and correct to the be s t of his knowledge.
4 Pd um J Not ary Public ANITA ELAINE REITER, NOTARY PUBLIC ROBINSON TOWNSHIP, ALLEGt1ENY COUNTY MY COMMISSION EXPIRES OCTOBER 20,1996 i
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BEAVER VALLEY POWER STATION - UNIT NO. 2 DUQUESNE LIGHf COMPANY Interim Report No. 2 on Potential Deficiency of Westinghouse Solid State Protection System 1.
SUMMARY
Westinghouse has ident ified a pot ent ial pr oblem in the so lid state prot ect ion system (SSPS) on-line tes t ing circuits for sys tem relays which could result in an unde t ect ab le fa ilur e.
The SSPS pr ovides protection and control of plant equipment, reactor trips, and actuates the engineered safety features systems.
2.
IMMEDIATE ACTION TAKEN Westinghouse not ified the Nuclear Regulatory Commission of the po t en-t ial problem in a le t ter dated August 6,
1982, from F.
P.
Rahe to Richard DeYoung, Director of the Of fice of Inspection and Enforcement.
On August 30, 1982, Duquesne Light Company (DLC) notified R. Keimig of the Region I of fice by telephone.
On September 29, 1982, l!LC provided additional details concerning this subject with the issuance of Interim Report No. 1.
3.
DESCRIPTION OF DEFICIENCY Periodic tes t ing of the solid state prot ection system requires actua-tion of system mas ter relays anci continui ty tes t of the output rel ays.
During testing, the vo lt age applied to the output relays is red uced from 120V ac to 15V dc.
A pushbutton test switch actuates the master relays and opens a switch contact shunt ing a proving lamp which veri-fies continuity of the output relays.
Upon com ple t io n of the t es t,
120V ac is restored to the output relay circuits.
If the shunt cont act f ails to close and the system is called upon to operate, 120V will be applied to the output relay through the proving lamp. The result could be burnout of the lamp and failure of the output relay to actuate.
l 4.
ANALYSIS OF SAFETY IMPLICATIONS l
l Failure of the SSPS output relays to actuate when required would prevent safety sys tems fr om automat ic ally performing their safety function.
l 5.
CORRECTIVE ACTION TO REMEDY DEFICIENCY Westinghouse is still reviewing proposed design changes of the on-line t es t circuitry design of the SSPS.
Upon canple t ion of the review, modifications will be made, where necessary, to remedy the problem.
6.
ADDITIONAL REPORTS j
DLC plans to issue another report on this issue when details concerning the correc t ive act ion are available.
It is e::pect ed that this repo rt l
will be issued to Region I by July 31, 1984.
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