ML20107C508
| ML20107C508 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 01/30/1985 |
| From: | Parsons R CAROLINA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-320, REF-PT21-85, REF-PT21-85-167-000 190, PT21-85-167, PT21-85-167-000, NUDOCS 8502210354 | |
| Download: ML20107C508 (4) | |
Text
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e CD&L Carolina Power & Light Company PN. N 1 1, ew H I N.C. 27562
-January 30, 1985 Mr. James P. O'Reilly NRC-320 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
' 7.5 KVA INVERTERS-CAPACITOR TERMINATIONS, ITEM 190
Dear Mr. O'Reilly:
' 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 October 24,1984. CP&L is-pursuing this matter, and it is currently projected that corrective action and submission of the final report will be accomplished by March 15,1985.
Thank you for your consideration in this matter.
Yours very truly, g
- 2: ;^A R.-M. Parsons Project General Manager
-Completion Assurance Shearon Harris Nuclear Power Plant RMP/sae -
Attachment cci - Messrs. G. Maxwell /R. Prevatte (NRC-SHNPP)
Mr.~ R. C. DeYoung (NRC) -
hg PDR OFFICAE COPY
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SHEARON HARRIS NUCLEAR POWER PLANT J
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UNIT NO. 1 L
SECOND INTERIM REPORT J
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. 7.5KVA INVERTER CAPACITOR TERMINATIONS,
. 9 CQL -8255
~ ITEM No. 190 L
JANUARY 16, 1985 a-N f
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'-REPORTABLE UNDER 10CFR50.55(e) AND 10CFR21 -
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SUBJECT:
Shearon Harris Nuclear Power Plant / Unit No. I 10CFR50.55(e) and 10CFR Part 21 reportable deficiency. 7.5KVA instrument inverter tuning
- capacitor terminations are such that a seismic event could result in a significant drop in inverter output voltage. This would result in the loss of ESF instrumentation, RPS, and NIS.
ITEM:
Ferroresonant transformer to tuning capacitor connections in 7.5KVA static inverters.
SUPPLIED BY:
Westinghouse Nuclear Service Division NATURE OF DEFICIENCY:
During the manufacture of 7.5KVA static inverters with non-PCB capacitors, ferroresonant transformer l'
leads using fast-on terminals were, on some occasions, connected to tuning capacitor solder lugs.
This resulted in deformed solder lugs and compromised the seismic qualification of the inverter.
_ SCOPE OF PROBLEM:
Investigation of this problem revealed deficiencies in three of four instrumentation inverters and two BOP inverters. -For-the nonsafety inverters, this deficiency represents an operational-limitation;
' DATE-PROBLEM
- 0CCURRED:
- Westinghouse-notification of October 5, 1984 was followed by inspection and verification of problem on October 22, 1984..
DATE-PROBLEM
- REPORTED:
On October 24, 1984, CP&LL (N. J. Chiangi). notified =
- the-NRC (Mr.'A. Hardin) that the above item was
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reportable under-10CFR50.55(e) and 10CFR Part 21.
' SAFETY IMPLICATIONS:. Loss of three~of four' inverters results in a loss of safety-related-RPS, nuclear instrument. system-(NIS),.
and;other: safety-related vital instrumentation and control; required _for safe shutdown.
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- -., y REASON
-DEFICIENCY IS REPORTABLE:
Failure of the_ supplier's QA program to control internal electrical termination practices resulted in equipment being shipped to the site which deviated from the supplier's specifications and inspection criteria. Such deviation, by analysis, results in compromised safety systems and functions.
- CORRECTIVE
' ACTION:
Westinghouse Technical Bulletin TB-84-08 has been issued as previously reported. The solder lug to fast-on terminal connections have been corrected. An ancillary problem developed during_the " pull test".
An attempted implementation of this recommended action resulted in NCR-84-2486 after several fast-on to fast-on capacitor connections failed to meet the 20-pound criterion.
After discussions with Westinghouse on pull test
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methodology, the conclusion reached was to reperform this test with the 20-pound passing standard.
FINAL REPORT: : The final report on this item is pending successful disposition of the pull test. Because of the difficulties encountered, the projected final report date has been moved to March 15, 1985.
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