U-600336, Documents Commitments to Resolve Issue Re Silicone Sealant in HVAC Ductwork.Periodic Tests Will Be Performed on Portion of Negative Pressure Ductwork Outside Main Control Room Habitable Zone

Documents Commitments to Resolve Issue Re Silicone Sealant in HVAC Ductwork.Periodic Tests Will Be Performed on Portion of Negative Pressure Ductwork Outside Main Control Room Habitable Zone

ML20138D400
Person / Time
Site:	Clinton
Issue date:	12/11/1985
From:	Spangenberg F ILLINOIS POWER CO.
To:	Butler W Office of Nuclear Reactor Regulation
References
U-600336, NUDOCS 8512130214
Download: ML20138D400 (2)

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U 600336 L30-85 (12-11 )-L 1A.120

/LLINDIS POWER COMPANY IP CLINToN PoMR STATION. P.o. BOX 678. CLINTON. ILLINOIS 61727 December 11, 1985 Docket No. 50-461 Director of Nuclear Reactor Regulation Attention:

Mr. W. R. Butler, Chief Licensing Branch No. 2 Division of Licensing U. S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

Clintan Power Station Silicone Sealant in HVAC Ductwork

Dear Mr. Butler:

The purpose of this letter is to document Illinois Power Company's (IP) commitments to resolve the silicone sealant issue.

Illinois Power Company's responses to the Staff's questions regarding the use of silicone sealant in the Main Control Room (MCR) air-conditioning ductwork at the Clinton Power Station were submitted in IP letter U-600248 dated October 8, 1985. These responses and subsequent telephone conversations between IP and the NRC conclude that the use of silicone sealant is approved upon IP's commitment to periodically test the affected ductwork.

To ensure that the silicone sealant is not degraded by extended use, an 18-month periodic test will be performed on the portion of the negative pressure ductwork outside the MCR habitable zone in accordance with ANSI N510-1980. This letter identifies the ductwork to be tested, and describes the duct leakage test procedure. A draft of the Technical i

Specification section describing the periodic testing of the MCR Heating Ventilation and Air Contitioning (HVAC) recirculation filter units and the 18-month periodic testing of the negative pressure ductwork will be developed and submitted to the Staff as part of the development of the CPS Technical Specifications.

Approximately 300 feet of ductwork, at elevation 825 feet, requires..

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testing. Five Sargent and Lundy design drawings # M14-1018 Sheets 10

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through 14 have been marked up and sent under separate cover to Mr.

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Byron Siegel, NRC Project Manager for Clinton Power Station. These gg gg drawings were requested by Mr. Siegel to enable the NRC Staff reviewer

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==mcn3 I $5h55i Testing of the ductwork will be accomplished using Test Procedure

-E E3@Eg GTP-31 " Ventilation Ductwork Leak Testing". This procedure invokes the requirements of ANSI /ASME N509 and N510-1980. Testing the negative gl pressure ductwork outside the control room pressure boundary will include the isolation dampers OVC03YA and OVC03YB.

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8512130214 851211 PDR ADOCK 05000461 F

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Pledse contact me if there are any questions regarding the use of silicone sealant on the Clinton Power Station NCR ductwork.

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Sincerely]yours,

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pa enber i

Manager - Licensing and Safety i*

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B. L.' Siegel, NRC Clinton Licensing Project Managdr NRC Resident Office Regional Administrat_or, Region III USNRC Illinois Department of Nuclear Safety 1

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