ML19323J013
| ML19323J013 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 06/09/1980 |
| From: | Parker W DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8006170637 | |
| Download: ML19323J013 (1) | |
Text
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- e DUKE POWER COMPANY Powra Burtmixo 42? Socra Cacaca Srazzi, CaAnt.oriz. N. C. 28242 wi wm o.
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June 9, 1980 VsCE PetSiO(NT ICLCPwCMC; ABCA 704 Svtan Paoovetion 373-4C S 3 Mr. James P. O'Reilly, Director
-U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 I
Re: McGuire Nuclear Station Units 1 and 2 Docket Nos. 50-369 and 50-370
Dear Mr. O'Reilly:
My letter of January 10, 1980 transmitted Significant Deficiency Report SD 369-370/79-13 (attached).
In this letter Duke committed to complete the inspection of the Unit 1 Nelson Electric equipment by June 1, 1980.
The completion of this inspection has been delayed until July 25, 1980.
The schedule for completing the inspection of the Unit 2 equipment remains unchanged. Any' deficient connections will be corrected consistent with this new schedule.
Very truly yours, adc
>u William O. Parker, Jr. 4p.
.#1, THH:ses Attachment cc: Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Bod
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f Dints PowEn COMPm Powrm Btnt.otwo 422 Sours Caraca Srazzr,Cnmrtz N.C.2a24a wiw w o.emanca.sm January 10, 1980 VSCE Pets 40 East TCLgpeeensW Amte 704 Seta Pecovcvien 373-40e 3 s
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Mr.~J. P. O'Reilly, Director U. S. Nuclear Regulatory Comission Region II 101 Marietta Street, Suite 1100 Atlanta, Georgia 30303 Re: McGuire Nuclear Station Units 1 and 2 Docket Nos. 50-369 and 50-370
Dear Mr. O'Reilly:
Pursuant _to 10CFR 50.55e please find attached Significant Deficiency heport SD 369-370/79-13.
Very truly yours,
.h n
i Willian O. Parker, Jr.
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THH:scs Attachnent cc:
Director 1
Office of Inspection and Enforcenent U. S. Nuclear Regulatory Coc=1ssica Washington, D. C.
20555 bec:
Ms. L. J. Bare Mr. E. B. Miller Mr. K. S. Canady Mr. W. L. Porter Mr. D. L. Canup Mr. 3. M. Rice Mr. W. A. Coley Mr. J. C. Rogers Mr. G. A. Copp Mr. N. A. Rutherford MrT L. C. Dail Mr. H. B. Tucker
Mr. R. L. Dick Mr. J. R. Wells Mr. R. S. Howard Mr. C. J. Wylie effe 'tC-801.02,' S15.0h Mr. J. M. McCarry see m n Mr. M. D. McIntosh
. Master FiTe MC-801.02, S?h43d
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DUKE POkT.R COMPANY McGuire Nuclear Station Report No.:
SD 369-370/79-13 Report Date: January 10, 1980 Facility: McGuire Nuclear Station - Units 1 and 2 Identification of Deficiencv: Faulty Connections in Electrical Equipment Description of Deficiency.
An invr.stigation was conducted as a consequence of the failure of a cable connection inside a statter of a safety-related motor control center.
It was found that the failure was due to improper stripping of insulation on the cables by the manufacturer, Nelson Electric Company. Cc=plete inspection of the motor control center involved in the incident revealed that six of 309 connections inside this center were potential sources of problems due to improper insulation stripping of cable. In addition to motor control centers other equipment supplied by Nelson Electric. includes panel boards, distri-bution centers and re=ote starters.
Analysis of Safety Imolications:
Theimphoperstrippingbackofinsulationoncablespriortomakingupa bolted connection of a cable to a power device inside the starter (breaker or contactor) would result in excessive heating of the cable and could result in eventual failure of the cable.
Such a cable failure vould result in loss of function of the equipment in the circuit of the failed cable. The equip-potentially involved includes fan, pump, and valve motors, inverters,
=ent batteries, heaters, transformers, and cranes.
Ptelitinary investigaticn indicates that this proble: is randc=, that the nu=ber of faulty connections is relatively s=all, and that there is snall probabdlity of redundant equipment being affected.
Corrective Action:
All Nelsen Electric distribution centers, panel boards, starters, and =ctor centrol centers at McGuire Units 1 and 2 vill be inspected to detect any possible proble=s si=ilar to the one described herein.
Inspection of all equipment identified above in Unit 1 is scheduled to be ccupleted by June 1, 1980.
Inspection of all Unit 2 equip =ent is scheduled to be c mpleted by Dece=ber 31, 1980.
Correction of any deficient connections vill be accenplished on this same schedule.
O
$602%iO't't'l
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