ML20137X787
| ML20137X787 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 02/28/1986 |
| From: | Watson R CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-422, REF-PT21-86, REF-PT21-86-122-000 209, HO-860241(O), NRC-85-391, PT21-86-122, PT21-86-122-000, NUDOCS 8603120014 | |
| Download: ML20137X787 (4) | |
Text
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CP&L b
h Carolina Power & Light Company O
SHEARON HARRIS NUCLEAR PROJECT P.O. Box 165
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New Hill, North Carolina 27562 CJ' FEB 2 81986 File Number: SHF/10-13510E Letter Number: HO-860241(0)
NRC-422 Dr J. Nelson Crace United States Nuclear Regulatory Commission 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. Crace:
Attached is our fourth 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 correceive action and submission of the final report will be accomplished by April 25. 1986.
Thank you for your consideration in this matter.
Yours very truly, Ls e R. A. Watson Vice President Shearon Harris Nuclear Power Plant RAW /jes Attachment cc: Messrs.
C. Maxwell (NRC-SHNPP)
J. M. Taylor (NRC) 8603120014 860228 PDR ADOCK 05000400 g
PDR I
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.T.E.2 7
CAROLINA POUER & LICilT CONPANY SilEARON llARRIS NUCLEAR POWER PLANT UNIT 1 FOURTil INTERIM REPORT SECONDARY DISCONNECT FINGERS 6.9 KV CIRCUIT BREAKERS NCR 85-391 ITEM 209 FEBRUARY 21, 1986 REPORTABLE UNDER 10CFR 50.55(e) AND 10CFR PART 21 NBI-MS-863242/2-OSS
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SUBJECT:
Shearon liarri s 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.
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.
liardin) 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 off-site or on-site sources needed to operate ESP Systems is compromised.
This reduces the degree of protection to plant sysi-ms and to public health.
CORRECTIVE ACTION:
Siemens-Allis has partially supplied new fingers to Shearon lia r r i s.
These fingers were subjected to a 100% conventional and compression inspection to assure conformance by Siemens-Allis.
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 NBI-MS-863242/3-OS5
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Shearon Harris site is currently inspecting secondary disconnect fingers at the site.
From initial inspections it has been determined that existing fingers do not conform to the length of the new fingers.
The original fingers will be replaced with the new fingers.
Completion of the installation of the new fingers will commence once Siemens-Allis supplies the balance of the disconnect fingers to the Harris site.
FINAL REPORT:
Installation of the new secondary disconnect fingers for 6.9 KV switchgear is scheduled for completion by April 25, 1986.
This delay in completion of corrective action was necessitated by continuing problems with subvendor's disconnect fingers with regard to uniform length of assemblies.
NBI-MS-863242/4-OSS