ML17275A991

Interim Deficiency Rept Re Diesel Generator Bldg Heating, Ventilation & Air Conditioning Sys Design,Initially Reported on 810305.Final Rept Will Be Submitted by 810701

ML17275A991
Person / Time
Site:	Columbia
Issue date:	04/07/1981
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, GO2-81-72, NUDOCS 8104140475
Download: ML17275A991 (7)

Text

REGULA RY INFORMATION DISTRIBUTIO~ SYSTEM (RIDS) o'OC 1

ACCESSION NBR;8100140rl DATE!'1/09/07 NO RIZED: NO DOCKET ProJecti Uniti Hashington Public Powe! 05000397

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FACIL'.50 397 NPPSS Nuclear AUTH ~ NAME'UTHOR AFFILIATION MATLOCKiR.G, I'washington: Public Power SUpply System REC IP ~ NAMEr REC IP IENT AFF IL'IATION ENGELKNE'gR ~ HE Region 5i San Francisco'ffice of the Dire'ctor<<

SUBJECT'nterjm deficiency rept r e diesel gener ator bldg, heatingr ventilation 8 air conditioning sys designiini teal l y r epor ted' on 810305.Final rept by 810701."

T o oo': 01 o V D-lT +E SIZEi TITLE'onstr uction Deficiency Repor t" (10CFR50 ~ 55E)

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Washington Public Power'Supply System A JOINT OPERATING AGENCY P.O. BOX 968 3000 GEO. WASHINGTON WAY RICHLAND,WASHINGTON 99352 PHONE (509) 372.5000 April 7, 1981 G02-81-72 Docket No. 50-397 Nuclear Regulatory Commission Region V Suite 202, Walnut Creek Plaza 1990 N. California Blvd..

Walnut Creek, California 94596 Attention: Hr . R. H. Engelken Director f -~~

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Subject:

WPPSS Nuclear Project No. 2 Docket No. 50-397, CPPR-93 Potentially Reportable 10CFR50.55(e)

Condition - WNP-2'No. 142 "Diesel .Generator'uildin'HVAC S stems" Gentlemen:

In accordance with provisions of 10CFR50.55(e), your staff was informed by telephone on Narch 5; 1981, of a "Potentially Reportable",condition in respect to a possible design deficiency in the Diesel Generator Building HVAC systems. The deficiency may result in failure of HVAC ductwork during a tornado event which cobld degrade the capability of the systems to perform their intended function.

Attached is an interim report on the subject condition. Please contact us if you have additional questions.

Very truly yours, Program Director, WNP-2 RGM:HLB:cph attachment cc w/att:~Y-.-Stel;1 o=NRC~ 'go(7 AD Toth - NRC Resident Inspector S RE Snaith - Burns 8 Roe JJ Verderber - Burns 8 Roe RC Root - Burns 8 Roe, site

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TA Mangelsdorf - Bechtel, site W. Wood - NUS Corporation WS Chin - Bonneville Power Admin.

WNP-2 Files

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POTENTIAI LY REPORTABLE CONDITION WPPSS NUCLEAR PROJECT NO. 2 DIESEL GENERATOR BUILDING 'HVAC 'SYSTEMS WASHINGTON PUBLIC POWER SUPPLY SYSTEM DOCKET NO. 50-397 LICENSE NO. CPPR-'93 Potential Problem The potential problem involves the adequacy of the Emergency Diesel-Generator Building HVAC ductwork to withstand damage and loss of function during a tornado event. This concern resulted from a similar potentially deficient condition reported to the NRC by our WNP-1/4 Projects.

Designs of the, systems for WNP-2 and WNP-1/4 are similar in that common intakes are utilized for both diesel engine air and HVAC air. The WNP-2 systems, however, do not include tornado dampers as utilized by WNP-1/4 projects and as incorrectly reported in the telephone notification of the potential condition on Harch 5, 1981.

roach to Resolution of the Problem

1. Determine the differential pr essure conditions and rates of change in pressure the HVAC ductwork will be subjected to during a tornado event considering the relative venting rates of the ductwork and surrounding building volumes.

.2. Evaluate the capability of the present ductwork to withstand, without damage, the pressure conditions determined to exist from Item 1 above.

3. Determine design modifications to the ductwork or system arrangement required to correct any deficient conditions which are identified.

In addition to the Emergency Diesel Generator Building HVAC systems, reviews will be made of other WNP-2 safety related HVAC systems to determine if similar potential deficiencies may exist. Parameters specified for Region III in Table I of Regulatory Guide 1.76, Revision 0, dated April 1974 will apply for all system reviews.

Attachment Page 2 of 2 Status of Pro osed Resolution The MNP-2 Architect/Engineer was directed by letter, MPBR-81-39 dated February 27, 1981, to perform the required analyses and evaluations of the safety related HVAC systems and to determine design or system modi-fications required.

The required work is currently in progress..

Reason Mh a Final Re ort Mill Be Dela ed Additional time required to accomplish the system evaluations and to determine modifications required.

Pro'ected Com letion of Corrective Action /

and Re ort It is expected a final report identifying deficient conditions and corrective action can be provided to the NRC by July 1, 1981.

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