ML20203B922
| ML20203B922 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 07/02/1986 |
| From: | Watson R CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-459, REF-PT21-86, REF-PT21-86-259-000 209, HO-860311(O), PT21-86-259, PT21-86-259-000, NUDOCS 8607180319 | |
| Download: ML20203B922 (4) | |
Text
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i CD&L Carolina Power & Light Company
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SHEARON HARRIS NUCLEAR PROJECT P.O. Box 165 New Hill, North Carolina 27562 JUL 2 1535 File Number: SHF/10-13510E Letter Number HO-860311(O)
NRC-459 Dr J. Nelson Grace United States Nuclear Regulatory Comission Region II 101 Marietta Street, Northwest (Suite 2900)
Atlanta, Georgia 30323 CAROLINA POWER & LICHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT 1986 - 900,000 KW - Unit 1 6.9 KV SWITCHCEAR CIRCUIT BREAKERS -
SECONDARY DISCONNECT FINGERS, ITEM 209
Dear Dr. Grace:
Attached is a final report on the subject item, which was deemed reportable per the provisions of 10CFR50.55(e) and 10CFR, Part 21 on March 1,1985. With this report, Carolina Power & Light Company considers this matter closed.
If you have any questions concerning this matter, please do not hesitate to contact me.
Yours very truly, R. A. Watson Vice President Harris Nuclear Project RAW /ime Attachment I
cc: Messrs.
C. Maxwell (NRC-SHNPP)
,L J. M. Taylor (NRC) 8607180319 860702 l
MEM/HO-8603110/PAGE 1/051 PDR ADOCK 05000400 S
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CAROLINA POWER & LIGHT COMPANY i
SHEARON HARRIS NIJCLEAR. POWER PLANT IINIT I FINAL REPORT 1,
SECONDARY DISCONNECT FINGERS a
6.9 KV CIRCtJIT BREAKERS NCR 85-391 ITEM 209 JIILY 1,1986 r
REPORTABLE IJNDER IC :FR 50.55(e) AND 10CFR PART 21 I
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IBMD-MS86-OS4/ Item 209
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SUBJECT:
Shearon !!arris 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 involvee 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 liREPORTABLE:
As redundancy is compromised due to a gereric deficiency, the availability of electric power from either off-site or on-site sources needed to operate ESF Systems is compromised. This reduces the degree of protection to plant systems.
CORRECTIVE ACfl0N:
Siemens-Allis has supplied new fingers to Shearon Harris.
Siemens-Allis has informed CP&L that the new fingers were provided by a previous supplier of these units and were subjected to a IBMD-MS86-0S4/ Item 209
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..; ', i CORRECTIVE ACTION (continued) 100% inspection to assure uniformity.
Siemens-Allis also stated future secondary disconnect fingers will be supplied to Siemens-Allis by this vendor. Replacement fingers have been installed in the subject 6.9 KV switchgear.
FINAL REPORT:
Based on completion of corrective action, this is the Final Report for Item 209.
IBMD-MS86-0S4/ Item 209