ML19210D622

Responds to NRC Providing Guidelines for Qualification of Containment Purge & Vent Valves & Requesting Commitment to Implement Valve Qualification Program.Development of Purge Sys Mods Underway

ML19210D622
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	11/19/1979
From:	Goodwin C PORTLAND GENERAL ELECTRIC CO.
To:	Eisenhut D Office of Nuclear Reactor Regulation
References
TAC-08291, TAC-8291, NUDOCS 7911270401
Download: ML19210D622 (2)

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~C November 19, 1979 Trojan Nuclear Plant Docket 50-344 License NPF-1 Director of Nuclear Reactor Regulation ATTN:

Mr. D. G. Eisenhut, Acting Director Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Dear Sir:

Your letter of September 27, 1979 provided guidelines for qualification of Containment purge and vent valves used during normal operation and requested a commitment to implement a valve qualification program on an expedited basis. We have completed our review of that letter and its guidelines and provide the following in response.

The 54-in. Containment Purge System isolation valves are presently being maintained shut during operation (in modes 1, 2, 3 and 4) due to a design deficiency in the purge ducting. A modification to the purge system is in the process of development and any valves used in the new system will be qualified in accordance with the guidelines you provided. Fbdifica-tions to the purge system will be such as to require at least one of the two 54-in. isolation valves in each penetration to be in the shdt posi '

tion during Plant operation. Therefore, qualification of the existing 54-in. valves with regard to the ability of the valves to operate during or following a LOCA is not considered to be necessary and is not planned at this time.

The 8-in. Hydrogen Vent System isolation valves are used for Containment pressure control during normal Plant operation. These valves are motor-operated rubber-seated Seismic Category I butterfly valves. Discussions with the velve manufacturer (BIF) and Brookhaven National Laboratory have confirmed that the valves uhich have been reviewed as, referenced in your letter did not include the model of valve installed at Trojan. Neverthe-less, Brookhaven National Laboratory has indicated that the areas of 3xq9 n7b L{O'l 79112 70 f

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' ' ' 3 'c:.x.i>!A : x 'C :Ct:GTV Director of Nuclear Reactor Regulation ATTN:

Mr. D. G. Eisenhut, Acting Director November 19, 1979 Page two concern are generic to all butterfly valves used for Containment isolation in these systems. Therefore, we plan to initiate a valve qualification program on an expedited basis specifically considering the guidelines provided by your letter of September 27, 1979 for the 8-in. Hydrogen Vent System isolation valves.

If you have further questions or comments, please do not hesitate to cont act me.

Sincerely,

//

s C. Goodwin, Jr.

Assistant Vice President Thermal Plant Opert. tion and Maintenance CG/GAZ/4mg6a6 c:

A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors Mr. Lynn Frank, Director State of Oregon Department of Energy 1799 n79

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