ML20135E427
| ML20135E427 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 08/26/1985 |
| From: | Watson R CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-384, REF-PT21-85, REF-PT21-85-411-000 209, NCR-85-391, PT21-85-411, PT21-85-411-000, NUDOCS 8509160393 | |
| Download: ML20135E427 (4) | |
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M CP&L Carolina Power & Light Company nawaww:w,_.www.un.
P.O. Box 101, New Hill, NC 2756::
August 26, 1985 Dr. J. Nelson Grace NRC-384 United States Nuclear Regulatory Commission Region II m
101 Marietta Street, Northwest (Suite 2900) x Atlanta, Georgia 30323 w
CAROLINA POWER & LICHT COMPANY T
SHEARON HARRIS NUCLEAR POWER PLANT 2
1986 - 900,000 KW - UNIT 1 6.9 KV SWITCHCEAR CIRCUIT BREAKERS -
SECONDARY DISCONNECT FINCERS, ITEM 209
Dear Dr. Crace:
t Attached is our second interim report on the subject item which was deemed reportable per the provisions of 10CFR50.55(e) and 10CFR, Part 21, on March 1, 1985.
CP&L is pursuing this matter, and it is currently projected that corrective action and submission of the final report will be accomplished by December 15, 1985.
Thank you for your consideration in this matter.
Yours very truly, fo u +'
R. A. Watson Vice President Shearon Harris Nuclear Power Plant RAW:mj Attachment cc: Messrs. C. Maxwell /R. Prevatte (NRC-SHNPP)
Mr. R. C. DeYoung (NRC) eso9160393 e50826 PDR ADOCK 05000400 S
PM NBI-NRC-384/1-0S5 t
CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT 1 SECOND INTERIM REPORT SECONDARY DISCONNECT FINGERS 6.9 KV CIRCUIT BREAKERS NCR 85-391 ITEM 209 AUGUST 20, 1985 REPORTABLE UNDER 10CFR 50.55(e) AND 10CFR PART 21
/
IBMD-WKK002-OS4 t
r
SUBJECT:
Shearon Harris Nuclear Power Plant unit No. I 10CFR50.55(e) and 10CFR Part 21 reportable deficiency. Non-uniform sized secondary disconnect fingers on 6.9 KV Class IE switchgear breakers Purchase Orders NY-435112 and NY-435113 from Siemens-Allis, Inc.
ITEM:
6.9 KV circuit breaker secondary disconnects.
SUPPLIED BY:
Siemens-Allis, Sanford, North Carolina.
NATURE OF DEFICIENCY:
Due to variations in manufacturing process and material, the secondary disconnect fingers are of varying length. The varying length affects the quality of the connections at the secondary disconnect. These connections are an integral part of the breaker control circuitry.
DATE PROBLEM IDENTIFIED :
Shearon Harris personnel identified this problem via NCR 85-391 on February 13, 1985.
DATE PROBLEM REPORTED :
On March 1, 1985, CP&L (Mr. N. J. Chiangi) notified the NRC (Mr. A. Hardin) that the item was reportable under the provisions of 10CFR50.55(e) and 10CFR Part 21.
SCOPE OF PROBLEM:
The deficiency involves the twenty five Unit 1 Class IE 6.9 KV switchgear breakers.
SAFETY IMPLICATIONS: When contacts are made with insufficient wipe and pressure to ensure adequate and reliable trip and reclose control circuits, the ability of the breaker to operate during emergency events is adversely affected.
REASON DEFICIENCY IS REPORT-ABLE:
As redundancy is compromised due to a generic deficiency, the availability of electric power from either offsite or onsite sources needed to operate ESF Systems is compromised. This reduces the degree of protection to plant systems and to public health.
1 IBMD-WKK002-0S4
4 i
CORRECTIVE ACTION:
Siemens-Allis has supplied new fingers to Shearon Harris. These fingers were subjected to a 10GT conventional and compression inspection to assure conformance. The Siemens-Allis Quality Assurance unit is pursuing corrective action through their subvendor via appropriate changes in the subvendors QA program and acceptance criteria. The Shearon Harris site is currently inspecting secondary disconnect fingers at the site. Non-conforming fingers will be replaced with correct fingers.
FINAL REPORT:
A final report will be issued once the corrective action described above is completed. This completion is currently anticipated by December 15, 1985.
IBMD-WKK002-0S4