ML18017A157
| ML18017A157 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 04/30/1980 |
| From: | Curtis N PENNSYLVANIA POWER & LIGHT CO. |
| To: | |
| References | |
| MCAR-1-38, NUDOCS 8005080311 | |
| Download: ML18017A157 (3) | |
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REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS) accEssIDN NOR:8005080311 Doc,DATE: 80/04/30
.foTARIzEDs No FACI '7 Susquehanna Steam Electric Station<
Unit ii Pennsylva usquehanna Steam Electric StationE Unit 2E Pennsylva AUTH,N AUTHOR AFFILIATION C UR T I S p N ~
fbi' Pennsylvania Power 8 Light Co ~
REC IP ~ NAME RECIPIENT AFFILIATION DOCKET 05000387 05000388 SUBJECT! Interim rept of def iciency on separation cri teria for electrical equipment, Caused by failure to backfit Reg Guide 1 '5 requirements. Final rept expected prior to 801231
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TWO NORTH NINTH STREET, ALLENTOWN, PA.
18101 PHONE( (215) 821-SIS I April 30, 1980 Mr. Boyce H. Grier Director, Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 SUSQUEHANNA STEAM ELECTRIC STATION INTER1M REPORT OF A DEFICIENCy ON SEPARATION CRITERIA FOR ELECTRICAL EQUIPMENT ERs 100450/100508 FILE 840-4/900-10 PLA-474 MCAR 1-38
References:
PLA-420 dated November 14, 1979 PLA-426 dated November 29, 1979
Dear Mr. Grier:
This letter serves to provide additional information concerning deficiencies in separation criteria for electrical equipment and systems previously reported under the provisions of 10CFR50.55(e) in the above references.
In particular, our evaluations of subsequent Bechtel reports on the referenced conditions have revealed additional concerns involving separation criteria which require investigation.
, Section 3.13.1 of the Susquehanna Steam Electric Station FSAR addresses the electrical separation criteria of Regulatory Guide 1.75 Rev.
1 (1/75) and commits to the use of IEEE Stand 384-1974 with certain exceptions.
Contrary to this commitment, several instances have occurred where this requirement was not specified in the equipment specifications provided to the manufacturer.
The root cause of these and other separation violation conditions is an apparent failure to backfit these requirementsinecessitated by-revised licensing criteria, in basic design documents.
Specific variations from the FSAR commitment have involved the 250VDC system (reported in PLA-420) and the 4.16KV switchgear (reported in PZA-426).
These and other deficiencies in electrical separation requirements will be consolidated, addressed and closed out as a single item in our future correspondence with the Commission.
The decision to treat these deficiencies as a single defective condition is based upon their similar nature and the proposed integrated course of corrective action to be taken by Bechtel to remedy the situation.
Some of the actions being taken include: the generation of a computer sort of cables in control panels, load centers, motor control centers, and other electrical equipment to determine if a mixture of more than one separation class exists; a review of all wiring and cable terminations in the equipment; and an analysis of internal wiring as well as the cable routing in equipment to deter-mine if separation nonconformances exist.
PENNSYLVANIA POWER L LIGHT COPhPANY
Mr. Boyce H. Grier April 30, 1980 Since the details of this report provide information relevant to the reporting requirements of 10CFR21, this correspondence is considered to also discharge any formal responsibility PPGL may have for reporting in compliance thereto.
Corrective action for deficiencies in all Unit 1 electrical equipment and the submission of a final report on the defective condition is expected prior to December 31, 1980.
The Commission will be advised of any significant developments on this subject, as they arise.
I Very truly yours, N.
W. Curtis Vice President-Engineering 6 Construction FLW:jmi cc:
Mr. Victor Stello (15 copies)
Director-Office of inspection 6 Enforcement U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. G. McDonald, Director (1)
Office of Management Information
& Program Control U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. Robert M. Gallo U. S. Nuclear Regulatory Commission P.
O. Box 52 Shickshinny, Pennsylvania 18655