ML20100P385
| ML20100P385 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 11/20/1984 |
| From: | Parsons R CAROLINA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-294, REF-PT21-84-542-000, REF-PT21-84-545-000 190, PT21-84-542, PT21-84-545, PT21-84-545-000, NUDOCS 8412140187 | |
| Download: ML20100P385 (4) | |
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[1dlA Carolina Power & Light Company P.O. Box 101, New Hill, N.C. 27562 November 20,1984 Mr. James P. O'Reilly NRC-294 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 l
7.5 KVA INVERTERS-CAPACITOR TERMINATIONS, ITEM 190
Dear Mr. O'Reilly:
- 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 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 January 31,1985.
Thank you for your consideration in this matter.
Yours very truly, g
. ^^; W R. M'. Parsons Project General Manager Completion Assurance Shearon Harris Nuclear Power Plant RMP/das Attachment cc:
Messrs.' G. Maxwell /R. Prevatte (NRC-SHNPP)
Mr. R. C. DeYoung (NRC) l khfl841120
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CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO. 1 INTERIM REPORT 7.5KVA-INVERTER CAPACITOR TERMINATIONS CQL-8255 ITEM NO. 190 NOVEMBER 21, 1984 u
REPORTABLE UNDER 10CFR50.55(e) AND 10CFR21 '
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SUBJECT:
Shearon Harris Nuclear Power: Plant / Unit No.1-10CFR50.55(e) and'10CFR Part 21 reportablei 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 and false reactor trip.
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 leads using fast-on terminals were, on some occasions,1 connected to tuning capacitor solder lugs.
This resulted in deformed solder lugs and: compromised the seismic qualification of the-inverter.
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-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.
4 DATE PROBLEM
,j' OCCURRED:.
Westinghouse ~ notification of October 5, 1984 was followed by inspection and verification of problem on i -
October 22, 1984.
-DATE PROBLEM REPORTED:
On October 24, 1984, CP&L.(N. J. Chiangi) notified the NRC (Mr. A. Hardin) that the above item was l
reportable _under 10CFR50.55(e) and 10CFR Part 21.
SAFETY IMPLICATIONS: Loss of three of four channels of ESF instrumentation results in false reactor trip.
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REASON ~
DEFICIENCY IS REPORTABLE:
This is reportable as a manufacturing error since as presently built, the inverters could prove to be inoperative during a seismic event. ~A common mode
, failure would~ result in unavailability of ESF s-instrumentation and false reactor. trip.
CORRECTIVE ACTION:
1.
Inspection of fast-on terminal for distortion and correction.per Westinghouse Technical Bulletin TB-84-08.will ensure adequate connection in the event that it is used on a capacitor fast-on' lug that may be available after a possible reroute of ferroresonant leads.
2.
If no spare fast-on lug is available, the fast-on terminal is to be removed and the lead wire is to be solder connected to appropriate solder lug on capacitor by means of detailed procedure included in TB-84-08.
3.'
Adequacy of connection, fast-on or solder per above, is to be tested by performing 20 pound pull test.
FINAL REPdRT:' The final report on this item is pending1 completion of the corrective actions stated above.
It is currently projected that the final report _will be issued by January 31,=1985, w
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