ML20063N803
| ML20063N803 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 09/29/1982 |
| From: | Woolever E DUQUESNE LIGHT CO. |
| To: | Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8210070233 | |
| Download: ML20063N803 (3) | |
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(412) 787 - 5141 (412)923 - 1960 Telecopy (412) 787-2629 Nuclear Construction Division September 29, 1982 Rob.nson Plaza, Building 2. Suite 210 Pittsburgh, PA 15205 United States Nuclear Regulatory Commission
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Region I 631 Park Avenue King of Prussia, PA 19406 Attention:
Mr. R. C. Haynes Administrator
Subject:
Beaver Valley Power Station - Unit No. 2 Docket No. 50-412 Potential Deficiency of Westinghouse Solid State Protection System Significant Deficiency 82-04 Gentlemen:
This interim report is in reference to the potential problem in the Westing-T house Solid State Protection System reported to the Nuclear Regulatory Commission by E. F. Kurtz, Jr., of Duquesne Light Company, on August 30, 1982.
Westinghouse is currently reviewing the on-line test circuitry design and upon completion of this review will recommend design changes, where necessary, to remedy the problem. Pursuant to the requirements of 10CFR50.55(e), an interim re-port is submitted, and it is expected that a subsequent report on this subject will be issued to the Region I Office by May 20, 1983.
DUQUESNE LIGHT COMPANY By n
E. J.(JJool'ever Vice President JMM/wjs Attachment
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cc:
Mr. R. DeYoung, Director, Office of Inspection and Enforcement (3) (w/ attachment)
NRC Document Control Desk (w/ attachment)
Mr. G. Walton, NRC Resident Inspector (w/ attachment)
Ms. E. Doolittle, Project Manager (w/ attachment)
Subscribed and sworn to before me this M day of h68 1982.
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_s-70tary Publili:
, ALAN B. BAN AS. NOTARY Puplic ROBINSON TViP., ALLEGHENY COUNTY Ni 00W@0N EmMS APlut 12.1986
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NUnitId States Nuclear R:gulatory Commission p:ge 2 COMMONWEALTH OF PENNSYLVANIA )
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On this day of
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, a Notary Public in and for said Commonwealth and County, per-sonally appeared E. J. Woolever, who being duly sworn, deposed, and said that (1) he is Vice President of Duquesne Light, (2) he is duly authorized to execute and file the foregoing Submittal on behalf of said Company, and (3) the statements set forth in the Submittal are true and correct to the best of his knowledge, information and belief.
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Notarf PtElic ALAN B. PANAS. NOTARY PUPUC ROBINSON TYlP.. ALLECHEhY COUNTY ur CCu'.itS5!CN EXPlRES APlill 12.1986 haber.Pennsutvania AssociaW,e of Notasies 1
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Bagvar Valley Power Station - Unit No. 2 Duquesne Light Company Interim Report on Potential Deficiency of Westinghouse Solid State Protection System 1.
Summary Westinghouse has identified a potential problem in the solid state protec-tion system (SSPS) on-line testing circuits for system relays which could result in an undetectable failure. The SSPS provides protection and con-trol of plant equipment, reactor trips, and actuates the engineered safety features systems.
2.
Immediate Action Taken Westinghouse notified the Nuclear Regulatory Commission of the potential problem in a letter dated August 6, 1982, from F. P. Rahe to Richard DeYoung, Director of the Office of Inspection and Enforcement. On August 30, 1982, Duquesne Light Company notified R. Keimig of the Region I office by tele-phone.
3.
Description of Deficiency Periodic testing of the solid state protection system requires actuation of system master relays and continuity test of the output relays. During testing, the voltage applied to the output relays is reduced from 120 V ac to 15 V dc.
A pushbutton test switch actuates the master relays and opens a switch contact shunting a proving lamp which verifies continuity of the output relays. Upon completion of the test, 120 V ac is restored to the,utput relay circuits. If the shunt contact fails to close and the system is called upon to operate, 120 V 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.
4.
Analysis of Safety Implications Failure of the SSPS output relays to actuate when required would prevent safety systems from automatically performing their safety function.
5.
Corrective Action to Remedy Deficiency Westinghouse is currently reviewing the on-line test circuitry design and upon completion of this review will recommend design changes, where neces-sary, to remedy the problem.
6.
Additional Reports Westinghouse will provide the schedule for completion of the design review and implementation of the corrective action to remedy the deficiency.
Duquesne Light Company plans to issue another report, interim or final, when additional details concerning the corrective action are available.
It is expected that this report will be submitted to Region I by May 20, 1983.
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