NRC-84-2486, Part 21 & Final Deficiency Rept CQL-8255,NCR 84-2486,Item 190 Re Deformed Solder Lugs in 7.5 Kva Inverter Capacitor Terminations Supplied by Westinghouse.Initially Reported on 841024.Revised Pull Test Criterion Implemented
| ML20128B708 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 04/16/1985 |
| From: | Parsons R CAROLINA POWER & LIGHT CO. |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-353, REF-PT21-85 190, CQL-8255, NRC-84-2486, NUDOCS 8505280031 | |
| Download: ML20128B708 (4) | |
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27562 P. O. Bo April 16, 198r Dr. J. Nelson' Grace NRC-353 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.Dr. Grace:
Attached is our final report on the subject item which was deemed reportable per the provisions of 10CFR50.55(e) and 10CFR, Part 21, on October 24, 1984.
With this report, Carolina Power & Light Company considers this matter closed.
If you have any questions regarding this matter, please do not hesitate to contact me.
Yours very truly,
- _': ;8 R. M. Parsons Project General Manager Completion Assurance Shearon Harris Nuclear Power Plant RMP/bc Attachment ec: Messrs. G. Maxwell /R. Prevatte (NRC-SUNPP)
Mr. R. C. DeYoung (NRC) p-or'
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UNIT NO.1 FINAL REPORT 7.5KVA INVERTER CAPACITOR TERMINATIONS CQL-8255 NCR 84-2486 ITEM NO.190 APRIL 5,1985 REPORTABLE UNDER 10CFR50.55(e) AND 10CFR21 XEX-ddll/2-OS5
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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 '
15EFIEITNCY:
DorU1g the manufacture of 7.5KVA static inverters with non-PCB capacitors, ferroresonant transformer 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 O_F_
PROBLEM:
Investigation of this problem revealed deficiencies in three of four instrumentation inverters and one BOP inverter. For the nonsafety inverter, ihis deficiency represents an operational limitation.
DATE PROBLEM OCCURRED I Westinghousc notification of October 5,1984 was followed by inspection and verification of problem on October 22,1984.
DATE PROBLEM EEPORTED:
On October 24,1984, CP&L (N. 3. Chiangi) notified the NRC (Mr.
A.
Hardin) that the above item was 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.
REASON DEFTCTENCY IS REPORTABLP.:
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.
).EX-ddll/3-OS5
is-l' 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 s
" 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.
Af ter discussions with' Westinghouse on pull test methodology, the conclusion' reached was-to reperform this test with the 20-pound passing standard. The connections again failed to meet the 20-pound criterion.
A suggested redesign' was forwarded to Westinghouse In'an effort
- to preclude the pull test. This redesign was reviewe'd and not accepted in favor of the results of-a ' reanalysis of connection requirements. The new connection test criterion of 5 pounds is' stated in Addendum A of TB-84-08..
' The pull test was performed on capacitor connections on 4-02-85.
The connections on the 4 inverters passed the modified pull test.
FINAL REPORT ~
Since corrective action has been successfully carried out, this is our final report.
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