ML20065N105

Interim Deficiency Rept Re Design Error in Solid State Protection Sys.Initially Reported on 820909.Westinghouse Continuing to Review Design & Has Revised Test Procedures to Verify Contact Closure.Also Reported Per Part 21

ML20065N105
Person / Time
Site:	Harris
Issue date:	10/08/1982
From:	Parsons R CAROLINA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
CON-NRC-12, REF-PT21-82 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8210220075
Download: ML20065N105 (4)

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CP&L Carolina Power & Light Company P. O. Box 101, New Hill, N. C. 27562 October 8, 1982 ca N > h.$,

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Mr. James P. O'Reilly United States Nuclear Regulatory Commission NRC-12 ]-

9-40 Region II W l ' 74 101 Marietta Street, Northwest (Suite 3100) , (pfy Atlanta, Georgia 30303 g Dg

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CAROLINA POWER & LIGHT COMPANY g t' ;

SHEARON HARRIS NUCLEAR POWER PLANT .-J >

1985 900,000 KW - UNITS 1 & 2 SOLID STATE PROTECTION SYSTEM -

PURCHASE ORDER NY-435002, ITEM 100

Dear Mr. O'Reilly:

Attached is an interim report on the subject which was deemed potentially reportable per the provision of 10CFR50.55(e) and 10CFR, Part 21, on September 9, 1982. Since that time the deficiency has been evaluated and determined to be reportable. CP&L is pursuing this matter and it is currently projected that corrective action and submission of the final report will be accomplished by March 5, 1983.

. Thank you for your consideration in this matter.

Yours very truly, g M ::^&

R. M. Parsons Project General Manager Shearon Harris Nuclear Power Plant RMP/bs Attachment cc: Mr. G. Maxwell (NRC-SHNPP)

Mr. V. Stello (NRC)

-Cr n'7 B210220075 B21000 PDR ADOCK 05000400 0 PDR J

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CAROLINA POWER & LIGHT COMPANY I SHEARON HARRIS NUCLEAR POWER PLANT l

UET NO. 1 l

SOLID STATE PROTECTION SYSTEM Interim Report October 4, 1982 I

l Reportable Under 10CFR50'.55(e)

Reportable Under 10CFR,.Part 21

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SUBJECT:

Shearon Harris Nuclear Power Plant, Unit 1 10CFR50.55(e) and 10CFR Part 21, reportable deficiency design in the Solid State Protection System (SSPS) purchased under Purchase Order NY-435002, Vostinghouse Shop Order 300 ITEH: On-line test circuit for the SSPS l

SUPPLIED BY: Westinghouse Electric Corp., Pittsburgh, Pennsylvania NATURE OF DEFICIENCY: The subject Unit i equipment has been received at the Shearon Harris plant. Basic equipment design is not unique to the Harris Plant.

l During a review of the schematic diagram of the SSPS,

! Westinghouse engineers discovered that an undetectable l

failure could occur in the on-line test circuits.

l l This consists of a normally closed contact (s) in a safeguards circuit (s) that is purposely opened during the test.

Reclosure of the contacts when testing is complete cannot be verified with present design.

DATE PROBLEM OCCURRED: Problem was verified by Westinghouse on August 3,1982.

DATE PROBLEM REPORTED: September 9,1982 - CP&L (N. J. Chiang1) notified the NRC Region II (A. Hardin) that this item was potentially j reportable under 10CFR50.55(e) and 10CFR21.

I SCOPE OF PROBLEM: The SSPS is redundant, Trains A and B. Either train will actuate the safeguards system.

Each train has sixteen (16) of the subject contacts.

I Failure of one (1) or more contacts to reclose in Train A would block operation of a part of the safeguards system if the like contact in Train B also failed to reclose. A total of thirty-two (32) contacts must be verified.

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. 't SAFETY IMPLICATION: As stated in " Scope of Problem", failure of a single contact in Train A and Train B, which perform the same safeguards function, would make this safeguards function inoperable. Additional like failures would render further safeguards functions inoperable.

REASON DEFICIENCY IS REPORTABLE: The safeguards system could te rendered inoperable.

CORRECTIVE ACTION: Westinghouse is continuing to review its design prior to change recommendations.

l For this interim period Westinghouse has revised test procedures for operating plants to verify contact reclosure.

Since Harris Plant is still in the construction stage, CP&L will take corrective action as mutually decided and agreed upon by Westinghouse and CP&L.

FINAL REPORT: A final report will be issued when the Westinghouse study has been completed and satisfactory corrective action has been taken. -

The projected final report date is March 5,1983.

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