ML20079H888
| ML20079H888 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 12/10/1982 |
| From: | Parsons R CAROLINA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-29, REF-PT21-82 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8212170183 | |
| Download: ML20079H888 (4) | |
Text
-_.
w CP&L Carolina Power & Light Company P. O. Box 101, New Hill, N. C.
27562 December 10, 1982 t '0 3a 1
Mr. James P. O'Reilly NRC-29'es m c6 United States Nuclear Regulatory Commission Q
io Region II
'N 101 Marietta Street, Northwest (Suite 3100)
(C r ~ ,
At.lanta, Georgia 30303
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CAROLINA POWER & LIGHT COMPANY
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SHEARON HARRIS NUCLEAR POWER PLANT c:p 1985 900,000 KW - UNITS 1 & 2 480V SWITCHGEAR DESIGN DEFICIENCY OF THE SECONDARY DISCONNECTS, hY-435171, ITEM 106
Dear Mr. O'Reilly:
Attached is an interim report on the subject item which was deemed reportable per the provicions of 10CFR50.55(e) and 10CFR, Part 21, on November 2, 1982. 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, 1983.
Thak you for your consideration in this matter.
Yours very truly, M
. M. Parsons Project General Manager Shearon Harris Nuclear Power Plant RMP/sh Attachment cc:
Mr. G. Maxwell (NRC-SHNPP)
Mr. V. Stello (NRC) gTLCl[*
V 8212170183 821210 a
{DRADOCK05000 ggpy L.-
s CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT t
UNIT NO. 1 480V SWITCHGEAR DESIGN DEFICIENCY OF THE SECONDARY DISCONNECTS INTERIM REPORT DECEMBER 9, 1982 REPORTABLE UNDER 10CFR50.55(e)
AND 10CFR21
s
SUBJECT:
Shearon Harris Nuclear Fower Plant Unit 1 10CFR50.55(e) and 10CFR21 reportable deficiency on the secondary disconnects on the 480V switchgear:
Item 106.
ITEM:
Secondary disconnects located on the circuit breaker cradles on the 480V switchgear which mate with the finger contacts on the circuit breaker.
SUPPLIED BY:
Brown-Boveri Company, Chalfont, Pa.
NATURE OF DEFICIENCY:
From April 1982 to November 1982, Brown-Boveri Company shipped Class lE 4S0V switchgear to the Shearon Harris site under Purchase Order NY-435171.
In October 1982, it was discovered that the circuit breaker cradles were f
assembled using an cider design of the secondary disconnects.
(The secondary disconnects are the points where control power is supplied tc the circuit breaker.) This older design was manufactured with rectangular tabs that hold contact strips in place and also a small cut-out in the contact strip located directly behind the rectangular tab (Part No. 712209-TI).
Brown-Boveri has advised us that there is a chance that the finger contacts can get caught behind the rectangular tabs in the contact strip cut-out and can break off when the circuit breakers are racked out of the cradles.
Therefore, control power to the circuit breakers could be lost.
DATE PROBLEM REPORTED:
!!ovember 2,1982 - CP&L (C. L. McKenzie) notified the NRC (C. Hehl) that this item is reportable under 10CFR50.55(e) and 10CFR21.
SCOPE OF PROBLEM:
The deficiency involves four Unit 1 Class 1E 480V switchgear (52 cubicles).
SAFETY IMPLICATIONS: The Class lE 480V switchgear supplies electrical power to nuclear safety-related equipment. Loss of control power to certain circuits in the 480V switchgear circuit breaker could result in improper functioning of the circuit breaker and thus affect power availability to nuclear safety-related equipment.
CORRECTIVE ACTION:
The secondary disconnects presently installed in the breaker cradle will be replaced with a newly designed secondary disconnect that will not cause the finger contacts on the circuit breaker to break.
i s
FINAL REPORT: A final report will be submitted once the corrective action above is completed. It is currently projected that this will be done by January 31, 1983.
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