ML20112F628
| ML20112F628 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 12/04/1984 |
| From: | Parsons R CAROLINA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-300, REF-PT21-84, REF-PT21-85-058-000 PT21-85-058-000, PT21-85-58, NUDOCS 8501150448 | |
| Download: ML20112F628 (4) | |
Text
D-W Cp&L y
$4 Dh.. Box 101, New Hill, NC 27562 December 4,1984
- Mr. James P. O'Reilly NRC-300
- United States Nuclear Regulatory Commission
. Region 11 101 Marietta Street,' Northwest (Suite 2900) i-
. Atlanta, GA ' 30323 CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT 1986 - 900,000 KW - UNIT 1 SOLID STATE PROTECTION SYSTEM
" PURCHASE ORDER NY-435002, ITEM 100
Dear Mr. O'Reilly:
" Attached is our final report on ti. subject item which was deemed reportable per the
. provisions of 10CFR50.55(e) and 10CFR, Part 21, on October 12,1982. With this report, Carolina Power and Light Company considers this matter closed.
lf you have any questions regarding this matter, please do not hesitate to contact me.
Yours very truly, Y:? :
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. R. M. Parsons Project General Manager Completion Assurance Shearon Harris Nuclear Power Plant
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Messrs.~ G.~ Maxwell /R. Prevatte (NRC-SHNPP)
Mr. R.' C.' DeYoung (NRC).
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CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO. 1 FINAL REPORT s
p SOLID STATE PROTECTION SYSTEM
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- DECEMBER 4, 1984 i
REPORTABLE UNDER 10CFR50.55(e) AND 10CFR21 t
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SUBJECT:
Shearon Harris Nuclear Power Plant, Unit 1, 10CFR50.55(e),10CFR, Part 21 reportable deficiency design in the Solid State Protection System (SSPS) purchased under Purchase Order NY-435002, Westinghouse Shop Order 300.
ITEM:
On-line test circuit for the SSPS SUPPLIED BY:
Westinghouse Electric Corp., Pittsburgh, Pennsylvania NATURE OF DEFICIENCY:
The subject Unit 1 equipment has been received at the Shearon Harris plant.
Basic equipment design is not unique to the Harris Plant.
During a review of the schematic diagram of the SSPS, 4
Westinghouse engineers discovered that an undetectable failure could occur in the on-line test circuits.
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 as originally designed.
DATE PROBLEM OCCURRED:
Problem was verified by Westinghouse on August 3, 1982.
DATE PROBLEM REPORTED:
September 9, 1982 - CP&L (N. J. Chiangi) notified the-NRC Region II (A. Hardin) that this item'was potentially reportable under 10CFR50.55(e) and 10CFR21.
October 12, 1982 - CP&L (L. Jones) notified the NRC Region II (A. Hardin) that this item was reportable under 10CFR50.55(e) and 10CFR21.
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SCOPE 0F PROBLEM:
.The SSPS is redundant, Trains A and B.
Either train will actuate the safeguards system.
Each train has sixteen (16) ot' the subject contacts.
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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r;*S SAFETY IMPLIC TION:
As stated in " Scope of Problem", failure of a single contact in Train A and B, which perform the same safeguards function, would make this safeguards function inoperable. Additional like failures would I
have rendered further safeguards functions inoperable.
REASON DEFICIENCY IS
-REPORTABLE:
The safecuards system could be rendered inoperable.
CORRECTIVE ACTION:
Westinghouse discovered that an undetectable failure could occur in the on-line test circuits of the Solid State Protection System (SSPS). As a result, Westinghouse revised test procedures for operating plants to verify contact rec 1osure until design change recommendations were complete.
Westinghouse completed its design review and issued a Field Change Notice modifying the Solid State Protection System (SSPS) output relay test panel to ensure detection of a potentially undetectable test circuit failure. This modification has been f'
implemented in the field to correct the reported condition.
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