ML19289E944

Forwards Interim Rept Re Discrepancies Discovered in Inboard Terminal Boxes of Electrical Penetration Assemblies

ML19289E944
Person / Time
Site:	Midland
Issue date:	04/03/1979
From:	Gibbs M ISHAM, LINCOLN & BEALE
To:	Cowan F, Kornblith L, Smith I AFFILIATION NOT ASSIGNED, Atomic Safety and Licensing Board Panel
References
NUDOCS 7905290540
Download: ML19289E944 (1)

Text

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Atomic Safety and Licensing Board Atomic Safety and Licensird Board U.S. Nuclear Regulatory Commission U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Washington, D.C. 20555 Dr. Frederick P. Cowan 6152 N. Verde Trail Apt. B-125 Boca Raton, Florida 33433 Re: Consumers Power Company (Midland Plant, Units 1 and 2)

Docket Nos. 50-329, 50-330 Gentlemen:

Enclosed is a S50.55(e) report which has recently been sub-mitted by Consumers Power Company to the Nuclear Regulatory Commission.

Very truly yours,

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^3 Martha E. Gibbs M3G bc cc: Service List w/ enclosures dn3,3 s 238 790529054e

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Sensor Vice President General o ffices: 1945 West Pernall Road, Jackson, Michigan 49201 * (517) 788 0453 March 30, 1979 Hove 106-T9 N13 t, sa v Mr J G Keppler, Regional Director NS""

office of Inspection and Enforcement

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US Nuclear Regulatory Cocmission .b% ~ g*

Region III 799 Roosevelt Road

{h I"# a Glen Ellyn, IL 60137 b p j 't\> I l 2 MIDLAND UUCLEAR PLANT -

UNIT NO. 1, DOCKET NO. 50-329 UNIT NO. 2, DOCKET No. 50-330 ELECTRICAL PEHETRATICU ASSDIBLY

Reference:

Letter SHHovell to JGKeppler; Midland Nuclear Plant - Unit No. 1, Docket No. 50-329; Unit No. 2, Docket No. 50-330; Electrical Penetration Assembly; Hove 15-T9; dated January 15, 1979 The referenced letter and this letter are interim 50.55(e) reports concerning the discrepancies found in the inboard termint.1 boxes of Unit No.1 and 2 electrical penetration assemblies. The attachment to this letter provides the current status of the corrective actions being taken.

Another report, either interim or final, vill be sent on or before May 25, 1979

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Attachment:

1. C.uality Assurance Program, Management Corrective Action Report, MCAR-1, Report 26, Interim Report 2, dated March 21, 1979.

CC: Director of Office Inspection and Enforcement Att: Mr. John G. Davis, Acting Director, USURC (15)

Director of Oefice of Management Infor=ation and Program Control, USURC (1) b$b')

BCC: JLBacon, M-1085A -

BWMarr 'lio, JSC-220A WRBird, JSC-216B PAMarturez, Bechtel AA RLCastleberry, Bechtel AA DBM111er, Midland TCCocke, Midland WGMoring, Bechtel AA JLCorley, Midland JNewgen, Bechtel-Midland LADreisbach, Bechtel-Midland MJSchaeffer, Midland W ibbs, IL&B File: 0.h.9 2h GSKeeley, ?-14 h083 9 .n r 7 > n LUVJ 4 U e

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Attachment 1

,. Howe-106-79

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Bechtel Associates Professional Corporation

SUBJECT:

MCAR #26 (Issued 12/19/78) . M g ;X E S M J2EI:

Electrical Penetration Assecblies, Inadequate Wire Terminations Wf lg INTERIM REPORT #2

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a DATE: . March 21,1979 1 I""

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PROJECT: Consumers Power Company b% '

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Midland Plant Units 1 & 2 e+*g j,.

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Bechtel Job 7220

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Introduction This report is submitted to advise regarding the interim status and course of action required pursuant to MCAR #26 and CPCo NCR M-01-4-8-107.

Descriotion of Discrenancv ,

Refer to interim report No. 1, dated January 8, 1979, for a description of discrepancy.

Probable Cause Further investigation by the Bechtel Supplier Quality Representative (SQR) has indicated that the equipment quality verification document packages are in order and that all crimping tools were properly calibrated and have proper calibration documentation on file. The investigation also indicated that the training records for nuclear production personnel were not on file as required. Other than the improperly filed training records, the investigation did not disclose any specific reason why the randon check by the SQR did not uncover any discrepancies. The training records were subs,equently retrieved and found to be acceptable.

Tne supplier provided his assessment of the probable cause, could nat identify any specific program breakdown, and caintains that the discrepancies are of a random nature. It was suggested that the failures may be duc, in part, to the type of termination lug that was used. Compression type, ring-tongue terminals with insulated ferrules were specified and provided. The insulation sheath covers the crimp and consequently makes visual inspection difficult. All of the suppliers current orders utilize uninsulated ferrules.

Corrective Action The supplier has initiated a 100% inspection program of all terminations on all current and future nuclear projects and has established a special training program for all nuclear production personnel. .This should prevent reocurrence for any potential add-on orders for Midland.

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Bechtel Associates ProfessionalCorpo' ration MCAR #26 -

.Page 2 With respect to the assemblies at the site, the supplier has perfor=ed a preliminary investigation and verified that the discrepancies exist. The supplier has agreed to send representatives to the site in April to complete a comprehensive inspection of all penetrations designated for Class IE circuits and selected penetrations designated for non-Class 1E circuits. They propose to inspect all of the #10,14,16 and. 20 gauge wires in all penetrations. Any crimps which are found to be defective will be replaced. All of the 350 MCM, 4/0, #2 and 6 gauge wire will be inspected in all of the pencerations which are designated for Class IE circuits. If the crimps in these penetrations pass a hand pull test, all re=aining penetrations with like wire sizes will be con-sidered acceptable. If discrepancies are identified, the sample size will be increased accordingly.

Safety Imolication Refer to interim report No. I dated January 8, 1979, for a discussion of safety implications.

Forecast Date of Corrective Action The corrective actions are scheduled for completion in April, 1979.

Submitted b M[

a RA' Approved by: MW

• Concurrence by: / R / Mw

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