ML20076F108
| ML20076F108 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 05/25/1983 |
| From: | Parsons R CAROLINA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-72, REF-PT21-83-992-000 10CFR-50.55E, PT21-83-992, PT21-83-992-000, NUDOCS 8306010422 | |
| Download: ML20076F108 (4) | |
Text
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1 O n d,,/4 Carolina Power & Light Company
/-[jg 4, *, Y8 P. O. Box 101, New Hill, N. C.
27562 May 25, 1983 Mr. James P. O'Reilly NRC-72 United States Nuclear Regulatory Commission Region II 101 Marietta Street, Northwest (Suite 3100)
Atlanta, Georgia 30303 CAROLINA POWER & LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT 1986 900,000 KW - UNITS 1 & 2 CLASS lE 480V MOTOR CONTROL CENTER PROTECTIVE GROMMET DEFICIENCY, PURCHASE ORDER NY-435143, ITEM 122
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 April 25, 1983. CP&L is pursuing this matter, and it is currently projected that corrective action and submission of the final report will be accomplished by December 16, 1983.
Thank you for your consideration in this matter.
Yours very truly,
.ppp k e: +
R. M. Parsons Project General Manager Shearon Harris Nuclear Power Plant RMP/sh Attachment cc:
Mr. G. Maxwell (NRC-SHNPP)
Mr. R. Prevatte (NRC-SHNPP)
Mr. V. Stello (NRC) f{5Ci T Cb$
8306010422 830525
(( 27 PDR ADOCK 05000400 S
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CAROLINA POWER & LICHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO. 1 INTERIM REPORT CLASS lE 480V MOTOR CONTROL CENTER PROTECTIVE GROMMET DEFICIENCY MAY 25, 1983 ITDI 122 REPORTABLE UNDER 10CFR50.55(e)
Ah9 10CFR21
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SUBJECT:
Shearon Harris Nuclear Power Plant Unit No. I 10CFR50.55(e) and 10CFR21 Reportable Deficiency -
480V Motor Control Center Protective Crommet Deficiency ITEM:
The grommets protecting cable from the edges on the 1k" and 1 " knockouts between the wireway and circuit breaker compartment on the 480V Motor Control Centers (MCCs).
SUPPLIED BY:
Could, Inc., 'ndustrial Controls Division, Westminster, Maryland, under Purchase Order NY-435143.
NATURE OF DEFICIENCY:
In March 1983, the craft electrical superintendant reported that a problem existed in a nonsafety MCC where the circuit breaker constantly tripped.
It was observed that the insulation on the cable running from the circuit breaker to a wireway had been damaged. The cable conductor was in contact with the sheet steel of the MCC and created a ground fault anytime the circuit was energized. A plastic protective grommet had become dislodged from the knockout through which this cable passed and allowed the cable conductor to come in direct contact with the sharp edges of the knockout.
CP&L QA personnel conducted a survey to determine if grommets becoming dislodged was a generic problem that affected safety class MCCs.
It was observed that this problem affected all Class IE and Nonclass 1E MCCs.
DATE PROBLEM REPORTED:
April 25, 1983 - CP&L (N. J. Chiangi) notified the NRC (A. Hardin) that this item was reportable under 10CFR50.55(e) and 10CFR21.
SCOPE OF PROBLdII This problem affects the twenty Class lE Motor Control Centers.
l l
REASON DEFICIENCY IS, REPORTABLE:
If the protective grommet should become dislodged, then the Class 1E cable would come in contact with the sharp edges of the knockouts. Movement of the cable on the sharp edges of the knockout can wear away the insulation j
and create a ground fault causing the breaker to trip.
l This will affect power availability to safety class loads.
l l
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CORRECTIVE ACTION:
Gould has been made aware of this problem. Our resolution to install either of the following in the ik" and l\\"
knockouts:
1.
A conduit nipple with a locknut.
(This is the same part being used to terminate conduit at Class lE equipment.)
2.
Flexible embossed vinyl steel core trim around the sharp edges of the knockout.
The above two solutions will eliminate the concern of cable being exposed to the sharp edges of the knockouts.
FINAL REPORT: Work is currently underway to implement the corrective action listed above.
It is currently projected that a final report will be submitted by December 16, 1983.
.