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Forwards Technical Evaluation That Concludes Fireproofing of Supports for safety-related HVAC Ducts Not Required & Amends Fire Protection Commitment Re HVAC Sys Support Fireproofing
	ML20042F261
Person / Time
Site:	Mcguire, McGuire
Issue date:	04/30/1990
From:	Tucker H; DUKE POWER CO.
To:	; NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
	GL-86-10, NUDOCS 9005080061
	Download: ML20042F261 (4)
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g April-30,' 1990- g. y U.S 3 Nuclear Regulatory Commissions

        +                              ATTF:= Document-Control Desk                                                                                                -"

Washington, D.JC. =20555 y Subject . Meuuire Nuclear Station, Units _1_and 2 Docket Nos. 50-369 and-50-370- y y Amendment to Fire Protection. Program-Involving Fireproofing? ,

of: Heating Ventilation;and. Air _. Conditioning (HVAC) Duct Supports Gentlement- 5 '

                                  ,This11etter provides'a technical evaluation that concludes,fireproofing of'                                                         1
                                  - supports -for safety related HVAC ducts penetra = ;.g fire barriers ;is not:                                                         l required in all cases, and_ amends our' fire. protection commitment regarding                                                  1 llVAC system support fireproofing.- Gen 9 tic' Letter No'.186-10,' Implementation'.                                              j of Fire Protection _ Requirements . issued-by;the NRCl staff o.. April.24,-1986' j

allows. amendments to the Fire Protection Program if-the changes do-not - , affect the ability to achieve and maintain ^ safe ~ shutdown conditions in'the ti event of a fire, Find attached-our-engineering analysis that: supports this. ,

                                  . amendment to our Fire Protection: Program.                                                                      ,

A copy of this letterTis'also being provided to NRC Region II and-the NRC Senior Resident Inspector. e . j

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If there are any questions, please contact S.E. LeRoy at 704-373-6233.t :l q Very truly yours, 11 q a C l a .<h. r e 1

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Hal.B. Tucker * -1 Attachments i l

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U.S. Nuclear Regulat6ty-Com ission g' \ i ATl'N : Document Control Desk'- ^ O R AprU-30. 1990 g P. age 2 > Q. 4 r (

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s. xc: ;Mr. S.D. Ebneter, Adn..nistrator' 4 U. S. Nuclear Rcgulatory Commission,. Region 11~ 101 Marietta Street, NW, Guite 2900 , i 1 Atlanta, Georgia. 30323, i 4 4 1 Mr. D.S. Hood,-Projec't Manager .

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j Office of Nuclear. Reactor Regulation..USLRC' ' Washington, D.C. 20555 , i 1

Mr. - P.L i Van Doorn - Senior Resident. Inspector, USNRC;> _

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U.S. Nuclear Regulatory Commission ATTN: Document Control Desk April 10, 1990 At t achinent Dtne Power Cocpany

    .                                                                        McGuire Nuclear Station s'

Fireproofing Supports for Safety Related Heating, Vent ilation, and Air Conditioning (HVAC) Ducts NUREG-0422 Supplement No. 6 of the McGuire Nuclear Station Safety Evaluation Repc rt states that fireproofed supporte are provided for safety related HVAC ducts. BJ barriers was first noted by NRC staff during the evaluation of the McGuire Fire Protection Review, as documented by NRC letr.ers dated June 14, and September 6, 1978. Duke Power Company (DPCo) provided a response to these concerns by letter dated November 2, 1978, which also idso:ified five different fire damper 3r-tallation methods. Due t o the special duet construction methods required for the safety related duct s , it was necessary to deviate fron) the manufacturer's installation instructions for fire dampers. The ducts are cont.inuously welded and t he f tre dampers are installed inside the ducts within +.he confines of the fire rated barrier. The ducts are seismically supported and restrained on either side of the fire wallen This type of insulletion provides the system necessary to assure unint errupted air flow to the creas. Information provided by the DPCo response resulted in an NRC staif response that continuously welded HVAC ducts should be supported by:

1) f ireproofing the atructural supports wit.hin five feet of the punetration; or,

2) Fireproofing the HVAC duct and the first structural support if it is located more than five feet from the penetration, or add an additionr1 uupport within five feet of the penetration.

Also, all fireproof 9ng rating was required to be equivalent with the danper ratins;. LRCo choue t.o fireproof supports within five feet of the penetratioc. Juring a recent DPCo Self Initiated Technical (3ITA) Audit, hango.ra o" the Control Area Ventilation ("C) syntmt penetrating the floor were noted as not , l being titeproofed. To de.t. ermine the operability of the peantration, a fire I I loading engineering analyu ts was performed. This analysis detomined the l inercase in , .om air temperatne as a result of a fire involving the L (Y available emuhustibles in the roon. The effects of this clerrated ! , tenperaturt were t hen evaluated in reviewing the structural adequacy of this I ! duet support. h _g, I a hi l Il y

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                              ,       .       -U.S. Nuclosr R:gulctory Commission-CATTh's Documeni. Control Desk Aprl) 30, 1990-'                                                                                                                                                                                 ,

Attachment This analysis is conservative because.it assumes complete'co...Jtion of all. conbustibles in the room. The analysis also assumes that all sf the energy . ptoduced is utilized to increase the roori temperature. . In reality, the-boundaries of the area (concrete floor, walls. and ceiling) as well as the-equipment in the. area will absorb part of the heat; thereby,' restricting the _ i t amount available for exposing the steel hangers.

                                              -Without any engineering evaluation, and being unable to follow all code'                                                                                                                         ;

[( requirements for fire damper installations,-the previous commitment to ; fireproof the safety related hangers is considered valid. -Based'on . . subsequent engineering analysis, evidence is clear that;theLfireproofing is stot necessary.in all cases. Therefore, we propose to conduct a field survey ' of safety related ducts penetrating fire walls and floors. An engineering analysis.will bo performed to evaluate fire exposure to the steel hangers.

                                              .In areas where the analysis > indicates a:need,'we will maintain the existing.                                                                                                              j fireproofing.                                                                                                                                                                                    i The Mi.Guire Fire Protection Review wil1~be revised to reflect this position at the time of the next rtvision.                                                                                                                                                                ,

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ML20042F261

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