ML20083B544
| ML20083B544 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 12/14/1983 |
| From: | Parsons R CAROLINA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| CON-NRC-157, REF-PT21-83 10CFR-050.55E, 10CFR-50.55E, 122, NUDOCS 8312210197 | |
| Download: ML20083B544 (4) | |
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- parolina Powergightgpany P. O. Box 101, New Hill, N. C. 27562 December 14,1983 Mr. James P. O'Reilly NRC-157 United States Nuclear Regulatory Commission Region II 101 Marietta Street, Northwest (Suite 2900)
Atlanta, Georgia 30303 CAROLINA POWER & LIGHT COMPANY SHEARON HARRE NUCLEAR POWER PLANT I
1986 900,000 KW - UNITS 1 & 2 i
CLASS lE 480V MOTOR CONTROL CENTER PROTECTIVE GROMMET DEFICIENCY, PURCHASE ORDER NY-435143, ITEM 122
Dear Mr. O'Reilly:
Attached is our second inte-im 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 January 31,1984.
Thank you for your consideration in this matter.
Yours very truly, yff R. M. Parsons Project General Manager Shearon Harris Nuclear Power Plant RMP/bk Attachment ec:
Messrs. G. Maxwell /R. Prevatte (NRC-SHNPP)
Mr. R. C. DeYoung (NRC)
OFFICI Al, COP'i 1a, 8312210197 831214 PDR ADOCK 05000400
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s PDR
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CAROLINA POWER & LIGHT C0ffPANY SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO. 1 SECOND INTERIM REPORT DECEMBER 16, 1983 CIASS 1E 480V MOTOR CONTROL CENTER PROTECTIVE CROMMET DEFICIENCY ITEM 122 REPORTABLE UNDER 10CFR50.55(e) AND 10CFR21
SUBJECT:
Shearon Harris Nuclear Power Plant Unit No. 1 10CFR50.55(e) and 10CFR21 Reportable Deficiency 480V Motor Control Center Protective Crommet Deficiency ITEM:
The grommets protecting cable from the edges on the Ih" and li" knockouts between the wireway and circuit breaker compartment on the 480V Motor Control Centers (MCCs).
SUPPLIED BY:
Could, Inc., Industrial Controls Division, Westminster, Maryland, under Purchase Order NY-435143.
NATURE OF DEFICIENCY:
In March 1983, the craf t electrical superintendent 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 lE and Nonclass IE 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 PROBLEM:
This problem affects the 20 Class IE Motor Control Centers.
REASON DEFICIENCY IS REPORTABLE:
If the protective grommet should become dislodged, then the Class lE 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 and create a ground fault causing the breaker to trip.
This will affect power availability to safety class loads.
i CORRECTIVE ACTION:
Could has been made aware of this problem.
Our resolution to install either of the following in the ik" and 1\\"
knockouts:
1.
A conduit nipple with a locknut.
(This is the same part being used to terminate conduit at Class 1E 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: The corrective action stated above has been completed; however, inspection of the work and the processing of all required documentation has not been completed.
It is currently projected that a final report will be issued by January 31, 1984.
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