ML19210E672

Interim Deficiency Rept Re Violation of Separation Criteria for 4.16 Kv Switchgear.Caused by Failure to Delineate or Incorporate Separation Requirements Re Project Specs Governing Vendor Wiring.Problem Under Review

ML19210E672
Person / Time
Site:	Susquehanna
Issue date:	11/29/1979
From:	Curtis N PENNSYLVANIA POWER & LIGHT CO.
To:
References
PLA-426, NUDOCS 7912050506
Download: ML19210E672 (2)

Text

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PP&L TWO NORTH NINTH STREET. ALLENToWN, PA. 18101 PHONE: (215) 821 5151 NORMAN W CURTIS Vice Prescent Engineenna & Construction 821 5381 November 29, 1979 Mr. Boyce H. Grier Director, Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 SUSQUEHANNA STEAM ELECTRIC STATION INTERIM REPORT OF A DEFICIENCY REGARDING VIOLATION OF SEPARATICU CRITERIA FOR 4.16 KV SWI'ICHGEAR ERs 100450/100508 FILE 840-4 PLA-426

Dear Mr. Grier:

This relates to a deficiency, re artable under the provisions of 10CFR50.55(e),

which was identified to Mr. Robert Gallo, NRC Resident Inspector, by Mr.

A. R. Sabol of PP&L during a telephone conversation en November 21, 1979. The deficiency involves separation criteria for vendor supplied electrical panels and switchgear.

Section 3.13.1 of the Susquehanna Steam Electric Station FSAR requires applica-tion of the electrical separation criteria of Regulctory Guide 1.75 Revision 1 (1/75) and comits to the use of IEEE Standard 384-1974.

MCAR-1-38 was written by Bechtel on October 12, 1979 as a result of NCR 4277 The nonconformance, which was discovered on August 1, 1979, relates to an apparent separation violation in the 4.16 KV Switchgear. The MCAR further documents the facts that although Electrical Separation Description Drawing E60 Rev. 4 was revised by DCN 1 (4/3/79) to require separation for cables terminated inside electrical equipment, similar separation requirements were not delineated or incorporated into project specifications to govern vendor wiring since the equipment had been fabricated and shipped to the jobsite.

PPGL has determined that the fol.'owing conditions reported in MCAR-1-38 represent a deficiency reportable under 10CFR50.55(e):

1. Vendor wires for redundant DC Feeder Cables are run within six inches of each other in the 4.16 KV Switchgear lA203 and 1A204.

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Mr. Boyce H. Grier November 29, 1979

2. At various locations inside switchgear compartments, vendor wiring, vendor jumpers and field jumpers are bundled in common with Class lE wiring of different divisions and/or Non-Class lE wiring.

The potential generic problem involved is under review and will be evaluated by PP&L after Bechtel's evaluation is completed. The condition is deemed reportable for the following reasons:

1. The conditions represent a significant deficiency in final design as approved and released for construction such that the design does not conform to the criteria and bases stated in the FSAR. The equipment internal wi.'ing does not conform with the separation criteria stated in FSAR Section 3.13.

2. The conditions, were they to have remained uncorrected, would have adversely affected the safety of operations of the nuclear power plant. A single event could have resulted in multiple failure within a Class lE switchgear which could degrade two redundant Class lE channelized battery systems.

A follow up letter will be submitted to identify the date by which a final definitive report will be provided.

Very trrly yours, O '

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N. W. Curtis Vice President-Engineering & Construction ARS:mcb cc: Mr. Robert M. Gallo U. S. Nuclear Regulatory Commission P. O. Box 52 Shickshinny, Pennsylvania 18655 Mr. G. Mcdonald Office of Management Information & Program Control U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. Victor Stello .(15)

Director office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 )fgf }Qf