ML20040E980

Provides Addl Clarification of TMI Action Items II.F.1.1 & II.F.1.2 Re Capability of Radioactive Gaseous Waste Sys & Isokinetic Sampling,Per NRC .Diagram of Waste Gas Sys Recycle Vent Encl

ML20040E980
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	01/29/1982
From:	Boehl D, Broehl D PORTLAND GENERAL ELECTRIC CO.
To:	Clark R Office of Nuclear Reactor Regulation
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.F.1, TASK-TM TAC-44963, TAC-45034, NUDOCS 8202080158
Download: ML20040E980 (3)

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January 29, 1982 Trojan Nuclear Plant Docket 50-344 License NPF-1 1.

Director of Nuclear Reactor Regulation ATTN:

Mr. Robert A. Clark, Chief Operating Reactors Branch No. 3 Division of Licensing U. S. Nuclear Regulatory Commission Washington, DC 20555

Dear Mr. Clark:

TROJAN NUCLEAR PLANT NUREG-0737, TMI Action Items II.F.1.1 and II.F.1.2 Your letter of December 23, 1981 provided the NRC evaluation of TMI Action Items II.F.1.1 and II.F.1.2 in NUREG-0737. This letter provides additional clarification on these Action Items, as agreed with your staff.

Your evaluation of Action Item II.F.1.2 concluded that no technical

-deviations were identified in the PGE responses. PGE's letter of.

October 1, 1981 provided a description of isokinetic sampling of effluents at Trojan and proposed to take an exception in accordance with ANSI 13.1-1969.

Since no technical deviation has been identified by the NRC, we assume that the proposed method of isokinetic sampling discussed in'our letter is acceptable and are proceeding with design accordingly.

Your evaluation of Action Item II.F.1.1 on Page 2 of Enclosure 1 implies that the venting capability of the Radioactive Gaseous Waste System to Containment includes a separate system to vent from pressure relief valves and from the gas collection header. The recycling system from the Radioactive Caseous Waste System to Containment will provide a vent-ing capability from downstream of the waste gas compressors to the gas

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collection header piping, upstream of the waste gas surge tank, which Yb returns the radioactive gas back to Containment (Refer to Figure 1).

J Cases entering the portion'of the gas collection header inside Containment will be vented directly into Containment and therefore never exit Contain-f

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ment. No provisions are made to vent from other points of the Radioactive f

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Caseous Waste System, since the purposa of this design modification is to 82020G0158 820129 PDR ADOCK 05000344 i

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W W BBCidCCotti3EMy Mr. Robert A. Clark January 29, 1982 Page two provide an additional waste gas storage capability to the waste gas decay tank. This venting capability would significantly reduce the potential for premature venting of the waste gas decay tanks via the Gas Collection Header Exhaust and provides additional assurance that the Radioactive Gaseous Waste System will perform its design function. Although the conclusion of your evaluation does not change, the preceding clarification is provided for your information.

Sincerely, W

Attachment c:

Mr. Lynn Frank State of Oregon Department of Energy l

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