ML20116G793
| ML20116G793 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 03/26/1985 |
| From: | Parsons R CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-338, REF-PT21-85, REF-PT21-85-206-000 209, NCR-85-391, PT21-85-206, PT21-85-206-000, NUDOCS 8505010612 | |
| Download: ML20116G793 (4) | |
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w97 P.O. Box 101, New Hill, N.C. 27562 March 26,1985 Dr. J. Nelson Grace NRC-338 United States Nuclear Regulatory Commission Region II 101 Marietta Street, Northwest (Suite 2900)
Atlanta, Georgia 30323 CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT 1986 - 900,000 KW - UNIT 1 6.9 KV SWITCHGEAR CIRCUIT BREAKERS -
SECONDARY DISCONNECT FINGERS, ITEM 209 w-qce
Dear Dr. Grace:
Attached is an 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 August 30,1985.
Thank you for your consideration in this matter.
Y,urs very truly, W
R. M. Parsons Project General Manager Completion Assurance Shearon Harris Nuclear Power Plant RMP/dd Attachment cc:
Messrs. G. Maxwell /R. Prevatte (NRC-SHNPP)
Mr. R. C. DeYoung (NRC) 8505010612 850326 PDR ADOCK 05000400 S
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CAROLINA POWER 6 LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT 1 INTERIM REPORT SECONDARY DISCONNECT FINGERS 6.9 KV CIRCUIT BREAKERS NCR 85-391 ITEM 209 MARCH 22, 1985 REPORTABLE UNDER 10CFR 50.55(e) AND 10CFR PART 21 IBMD-RHS001-0S4 MI IIl
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SUBJECT:
Shearon Harris Nuclear Power Plant unit No.1 10CFR50.55(e) and 10CFR Part 21 reportable deficiency. Non-uniform sized secondary disconnect fingers on 6.9 KV Class 1E 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. This 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 1E 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.
IBHD-RHS001-OS4 L
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,A CORRECTIVE ACTION:
Siemens-Allis is currently revising the manufacturing process for these fingers and negotiating with subvendors to supply these pieces. New fingers will be supplied to SHNPP from Siemens-Allia, when available.
Shearon Harris will examine circuit breaker secondary disconnects and replace fingers as needed.
FINAL REPORT:
A final report will be issued once the corrective action described above is completed.
It is currently projected that the submittal date will be August 30,1985.
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IBMD-RHS001-OS4