ML20126B360

Forwards Plot Showing Max Values of Fq Vs Core Elevation Based on Revised Fxy Limit Proposed in License Change Application 56.ECCS Performance Reanalysis Demostrated Sufficient Conservatism

ML20126B360
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	03/04/1980
From:	Goodwin C PORTLAND GENERAL ELECTRIC CO.
To:	Schwencer A Office of Nuclear Reactor Regulation
References
TAC-12649, NUDOCS 8003110540
Download: ML20126B360 (3)

Text

r l

., ', Z ?cr"ard General Eectric Cen cany

[ O.Y 3,., -

y, March 4, 1980 Trojan Nuclear Plant Docket 50-344 License NPF-1 LCA 56 Director of Nuclear Reactor Regulation ATTN

Mr. A. Schwencer,. Chief j

Operating Reactors Branch #1 Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D. C.

20555

Dear Sir:

In a telephone call on February 19, 1980 between Mr. Rich Lobell of your staff and C. J. P11uso of PCE, it was agreed that we would provide a plot showing maximum values of Fg versus core elevation based on the revised F

limit proposed in our License Change Application 56.

Attached are xy copies of the plots, one for the remainder of Cycle 2 operation and one for Cycle 3, which will commence following our April 1980 refueling. The calculated peaking f actors are 'below our current administrative peaking factor limi,t of 2.25, demonstrating that the proposed Fxy Technical Specification change can be made during Cycle 2 without violating the Fq envelope.

It should also be noted, as explained in our letter of January 9,1980 to Darrell Eisenhut, that we have. completed a reanalysis of the Trojan ECCS performance using the latest NRC-approved Westinghouse ECCS evalua-tion model. These calculations demonstrated sufficient conservatism so that we intend to relax the current administrative Fq limit of 2.25 and return to the Technical Specification limit of 2.32 following final in-i house safety review and concurrence.

Sincerely,

/

s/

C. Goodwin, Jr.

Assistant Vice President Thermal Plant Operation and Maintenance CG/CJP/4mg1A1 Attachment I

c:

Mr. Lynn-Frank 8003110S90 o

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