ML17275A762

Interim Deficiency Rept Re Diesel Generator Switchgear Units DGI-7 & DG2-8 Installation.Caused by Insufficient Clearance Between Cabinets to Prevent Impact During Seismic Event. Switchgear Units Connected to Generator Control Cabinets

ML17275A762
Person / Time
Site:	Columbia
Issue date:	12/10/1980
From:	Matlock R WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
10CFR-050.55E, 10CFR-50.55E, GO2-80-282, NUDOCS 8012230502
Download: ML17275A762 (6)

Text

REGULATORY I~"'lRMATION DISTRIBUTION SYST 'RIDS)

ACCESSION NBR:8012230502 DOC.DATE: 80/12/10 NOTARIZED: NO DOCKET FACIL:50"397 l4PPSS Nuclear Pr oj ecti Unit ?~ Nashington Public Powe 05000397 AUTH INANE AUTHOR AFFILIATION MATLOCKFR.G, Nashington Public Power Supply System RECIP ~ NAME RECIPIENT AFFILIATION Region San Francisco'ffice of the Director

~~/ 1 ENGELKENFReH, 5F

SUBJECT:

Interim deficiency rept re diesel generator switchgear units DGI-7 8 DG2-8 installation. Caused by insufficient clearance between cabinets to prevent impact during seismic event.

Switchgear units connected to generator control cabinets.

DISTRIBUTION CODE: B019S COPIES RECEIVED:LTR ENCL l SIZE:

TITLE: Construction Deficiency Report (10CFR50.55E)

NOTES:PM: 2 copies of all material. 05000397 RECIPIFNT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL CTION: A/D LICENSNG 00 1 1 YOUNGBLOODFB 05 1 1 RUSHBROOKFM, 06 1 LYNCHgD ~ 07 1 1 NTERNAL ~ AD/RCI/IE 17 1 1 AEOD 18 1 1 ASLBP/J ~ HARD 1 1 D/DIR HUM FAC15 1 1 DIR, DIV OF LIC 1 EDO 8 STAFF 19 1 1 EQUIP QUAL BR11 1 1 HYD/GEO BR 22 1 1 IEE 09 1 1 LIC QUAL BR 12 1 1 Mr A 20 1 1 NRC PDR 02 1 1 OELD 21 1 1 EV 13 1 1 QA BR 10 1 1 EG 01 1 1 RUTHERFORDF N ~ IE 1 1 21 1 1 XTERNAL: ACRS 16 16 16 LPDR, 03 1 1 NSIC 08 1 1 Dpi p 9 l98Q I/Z />

TOTAL NUMBER OF COPIES REBUIREO: LTTR +0 ENCL

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Washington, Public Power Supply System A JOINT OPERATING AGENCY K~

p P. 0. BOX 9BB 3000 GEOv WASHINCTON WAT RICHLAND. WASHINCTON QQ352 PHONC (50Q) 3T5 5000 Docket No. 50-397 December 10, 1980 G02-80-282 Nuclear Regulatory Commission Region V Suite 202, Walnut Creek Plaza 1990 North California Blvd.

Walnut Creek, California ~ 94596 Attention: Mr. R. H. Engelken, Director Gentlemen:

Subject:

WPPSS Nuclear Project No. 2

'e Docket. No. 50-397, CPPR-93 ortable Deficienc' 10CFR50:,55 e)

In accordance with the provisions of 10CFR50.55(e), your staff was informed by telephone on November 14, 1980, of a reportable deficiency relative to the installation of diesel generator switchgear units DGl-7 and DG2-8. Each of the units is located adjacent to its diesel generator control cabinet. In both cases insufficient clearance between cabinets was allowed to prevent impact during a seismic event which could invali-date seismic qualification of the equipment.

Attached is our report on this deficiency.

Please contact us if you have any additional questions.

Very truly yours,

. G. Mat ock Program Director, WNP-2 I

RGM:MFW:cph attachment cc w/att: JR Lewis - BPA ND Lewis - EFSEC; Olympia RE Snaith - Burns 5 Roe c~/7

< -.-,S.te;1:lo - NRC :='D Toth - NRC, Resident Inspector JJ Verderber - Burns 8 Roe CC, O+

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WASHINGTON PUBLIC POWER SUPP'I Y SVSTEbi'OCKET NO. 50-397 LICENSE NO. CPPR-93 REPORTABLE DEFICIENCY AND CORRECTIVE ACTION WPPSS NUCLEAR PROJECT NO. 2 SWITCHCiEAR UNITS DGl-7 AND DG2-8 INSTAL'L'ED'TOO CLOSE TO ASSOCIATED CONTROL CABINETS

'DESCRIPTION OF DEFICIENCY Diesel generator switchgear-units- DGl-7 and DG2-8 are installed adjacent to their respective diesel generator control cabinets. In each case insufficient clearance was allowed to prevent impact during a seismic event. Since the affect of impact was not considered in tests and analyses, the seismic .qualification of the switchgear and cabinets was invalidated. This has been determined to be a reportable deficiency under 10CFR50.55(e).

SAFETY IMPLICATIONS Certificaton that the equipment is qualified to withstand an SSE without interruption of safety function is reouired. Common mode failure could prevent safe shutdown during an S~E.

CORRECTIVE ACTION Burns and Roe Technical Memorandum No. 1213 has determined that connecting the switchgear units to'their r'espective diesel generator control cabinets to form a unitized assembly will prevent impact and that the new arrangement will AC inValidate the original seismic qualification.

A Project Engineering Directive'FED) will be prepared to make the connections as noted above.

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