ML17326B143

Forwards Suppl 2 to App R Evaluation of Auxiliary Bldg HVAC Duct Penetration & Containment Seismic Gaps, Providing Justification for Technical Exemptions Requested in 840615 Ltr

ML17326B143
Person / Time
Site:	Cook
Issue date:	08/13/1984
From:	Alexich M INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	Harold Denton Office of Nuclear Reactor Regulation
Shared Package
ML17326B144	List: ML17326B143 ML17326B145
References
AEP:NRC:0692U, AEP:NRC:692U, NUDOCS 8408170322
Download: ML17326B143 (6)

Text

REGULATORY INFORMATION DISTRIBUTION STEM (BIOS)

ACCESSION NBR 8408170322, DOC DATE 84/08/13 NOTARIZED, NO

~ 'OCKET FACIL:50'15 Donald C, Cook Nuclear Power Planti Unit 1~ Indiana- 8 05000315 50-316 Donald C Cook Nucl ear Power Pl anti,,Uni t 2< Indiana

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ALEXICH~M,P, Indiana 8 Michigan Electric Co,

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~ RECIPIENT AFFIL 1 ATION DENTON~H R ~ ~ Office of Nuclear Reactor. Regulationi Director

SUBJECT:

Forwards 'Suppl, 2 to,"AppR Evaluation of Auxi l i,any. Bl dg HVAC

. DuctPehetr ation Containment Seismi c Gaps~ ". provi ding DISTRIBUTION Justification fo technical exemption s requested in 840615 ltr, CODE s A006S r*

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INDIANA 8 MICHIGAN ELECTRIC COMPANY P.O. BOX 16631 COLUMBUS, OHIO 43216 August 13, 1984 AEP:NRC:0692U Donald C. Cook Nuclear Plant Unit Nos. 1 and 2 Docket Nos. 50-315 and 50-316 License Nos. DPR-48 and DPR-74 APPENDIX R TECHNICAL EXEMPTION FOR SEISMIC GAPS AND HVAC DUCT PENETRATIONS Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Denton:

In our June 15, 1984 letter to you we requested technical exemption for two areas of 10 CFR 50 Appendix R. These areas include (1) ventilation duct penetrations not supplied with fire dampers, and (2) seismic gaps between the containment and auxiliary buildings.

Attached is Supplement 2 to the Maroh 3, 1983, Report entitled "Safe Shutdown Capability Assessment and Proposed Modifications" for the D. C.

Cook Nuclear Plant. This supplement, prepared by our Consultant Engineering Planning and Management, Inc. (EPM), is a detailed engineering evaluation which provides justification for the technical exemptions requested in our June 15, 1984 letter. The following summarizes the findings of the attached evaluation.

VENTILATION DUCTS: The evaluation concludes that;, because of a low combustible loading of less than 15 minutes in all applicable fire areas/zones, the location of safe shutdown components/circuits and the detection and suppression systems available in the subject fire area/zones, adequate protection from duct related fire damage is provided and safe shutdown capability is ensured. As discussed with your staff, the evaluation includes five additional ventilation duct penetrations without fire dampers, that also require technical exemptions. These duct penetrations listed below were not identified in the June 15, 1984 letter.

No. of Size of 28" x 34" 22" x 34" 633'uxiliary 650~

50 Bldg Auxiliary Bldg 44" x 24" Auxiliary Bldg 8408i70322 8408i3 PDR ADOCK 0500031'5 I F PDR

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Mr. Harold R. Denton AEP: NRC: 0692U SEISMIC GAPS: The evaluation concludes that, because of the distance between fire areas/zones, low combustible loading, the location of combustible loading and/or the presence of detection and suppression systems within the areas/zones, the seismic gaps can be left as discussed in the report without compromising the capability of the plant to be safely shutdown in the event of a fire.

In addition, in our June 15, 1980 letter we committed to review whether the analyses performed to show that the auxiliary building would not be affected by the consequences of High Energy Line Breaks took credit for available relief area associated with seismic gaps. This review has shown that these analyses did not take credit for the seismic gaps.

However, the gaps were considered in the structural analysis.

This letter has been prepared following Corporate procedures which incorporate a reasonable set of controls to insure its acouracy and completeness prior to signature by the undersigned.

Very truly yours, M P. Al ich g~J, Vice Pr sident ~(~55 MFA/cm Attachments cc: John E. Dolan M. G. Smith, Jr.

R. C. Callen G. Charnoff E. R. Swanson, NRC Resident Inspector - Bridgman

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