ML20137E678

Forwards Rev 1 to Test Rept TS-TP-0084, Penetration C Fire & Hose-Stream Test for 10 Inches of TS-MS-0045-B Silicone Elastomer (Bus Duct Seal) & Extrapolation of Test Rept,Per 850425 Meeting & 850815 Telcon

ML20137E678
Person / Time
Site:	Hope Creek
Issue date:	11/21/1985
From:	Mittl R Public Service Enterprise Group
To:	Butler W Office of Nuclear Reactor Regulation
Shared Package
ML20137E684	List: ML20137E678 ML20137E688
References
NUDOCS 8511270293
Download: ML20137E678 (6)

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q Put$c Sannce Cd PS G Company Electnc and Gas 80 Park Plaza, Newark, NJ 07101/ 201430-8217 . MAILING ADDRESS / P.O. Box 570, Newark, NJ 07101 Robert L. Mitti General Manager Nuclear Assurance and Regulation November 21, 1985 Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission 7920 Norfolk Avenue Bethesda, Maryland 20814 Attention: Mr. Walter Butler, Chief Licensing Branch 2 Division of Licensing Gentlemen:

NON-SEGREGATED PHASE BUS DUCT INTERNAL PENETRATION SEALS HOPE CREEK GENERATING STATION DOCKET NO. 50-354 As discussed in an April 25, 1985 meeting in the NRC offices in Bethesda, Maryland between representatives of Public Service Electric & Gas Company (PSE&G) and the NRC and sub-sequent telecon (Messrs. W. Pavincich and J. Pantazes of PSE&G and Mr. D. Kubicki of the NRC) on August 15, 1985 concerning Non-Segregated Phase Bus Duct Internal Pene-tration Seals, PSE&G hereby submits the following documents for NRC review:

Attachment I Extrapolation of the Tech Sil Inc. Test Report No. TS-TP-0084 Revision 1 Attachment II Test Report: No. TS-TP-0084, Penetration "C" Fire and Hose - Stream Test for 10" of #TS-MS-0045-B Silicone Elastomer (Bus Duct Seal) Revision 1.

I 851121 chh05000354 k PDR f f I L The Energy People i 954112 (3M) 4 8 4 i

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Director of. Nuclear 2 11/21/85 Reactor Regulation

' In'the event there are any questions with respect to this correspondence,-do not hesitate to contact us.

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Very truly yours,

/y Attachment

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C D.H.'-Wagner USNRC Licensing Project Manager-A.R. Blough

.USNRC Senior Resident Inspector l

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. .4 ATTACHMENT I Extrapolation of the Tech Sil Inc. Test Report No.

TS-TP-0084 Revision 1 PSE&G is providing a three hour fire tested penetration seal internal to the non-segregated phase bus ducts in the rated fire barriers surrounding the four emergency diesel generator rooms. The actual bus section tested was a hollow aluminum bar, while the Hope Creek configuration consists of a solid copper bus at the point where the silicon elast-omer seal will be placed. The test report (Attachment II) can be extrapolated for this change of bus material due to the reasons identified below.

The bus duct fire seal test that was used to justify the LaSalle station configuration is No. TS-TP-0084 Revision

1. This test was performed on a section of H.K. Porter non-segregated phase bus duct that is essentially the same as that used at Hope Creek Generating Station (H.K. Porter supplies the Hope Creek bus also). The comparison of the configuration tested in TS-TP-0084 and the configuration to be sealed at Hope Creek is described below.

LaSalle Hope Creek

1. Seal is placed around 1. Seal is placed at tran-hollow Aluminum bus bar, sition of solid copper requiring plugging and bus bar to aluminum bus filling of hollow bar. bar. Seal is placed around Solid Copper bar which has a higher melting point than aluminum.

2. Both faces of the Tech- 2. One of the surfaces of Sil seal that could be each Hope Creek seal will exposed to a fire are be protected by a k" thick

" unprotected" since the aluminum plate which is damming material is re- a permanent structural moved after installation. fixture.

3. The surface temperature 3. There are also no combust-of the aluminum conduct- ibles.near the Hope Creek ors at the non-fire side conductors to be sealed, of seal reached 492*F at due to the fact that the 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />; however, there bars are enclosed within are no combustible mater- the duct.

ials near this surface.

LaSalle Hope Creek

4. The concrete in which 4. The concrete in which the seal is placed is the seals are placed is 12" thick. a minimum of 12" thick while most are thicker (either 18" or 36").

This feature provides greater shielding of the seal surface on the fire side.

5. The temperature at the 5. The Hope Creek configur-bus duct-seal interface ation is also free of surface reached 327 F combustibles at the junc-at 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />; however, ture. (See No. 3 above).

there are no combust-ible materials near this surface juncture.

6. The seal material used 6. The seal materials used between the bus duct between the bus duct and and the concrete open- the concrete opening are ing is 10" of TS-MS- tested and approved BISCO 0045-B silicone elast- materials SF-15NH (12" omer (70-95 lbs/cu. ft.) in the vertical openings without any permanent with permanent H.K. Porter damming surface. bus support plate) and 12" of SF-20 (with per-manent 1" ceramic fiber damming boards at each horizontal opening for a total seal thickness of 14").

The above comparison indicates that the Hope Creek config-uration, when sealed with the TS-MS-0045 Silicone Elastomer, will be equal to or better than the LaSalle configuration, with regard to fire resistence and similarity to the tested design.

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l' In addition, pullout of the penetration seal-due to a post-ulated bus duct' mechanical failure induced by temperature

= effects of a fire is negated by.the presence of a bus duct support within the: fire barrier. 1This support provides adequate assurance that' bus duct. failure will not result in a penetration seal failure due to pullout.

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J ATTACHMENT II

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