ML19320B144

Submits Clarification of 800616 Addl Info Re Containment Purge Sys,Submitted in Response to 800318 Request.High Radiation Signal Can Be Overridden Manually by Raising Setpoint or Holding Reset on Radiation Monitors Panel

ML19320B144
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	07/03/1980
From:	Goodwin C PORTLAND GENERAL ELECTRIC CO.
To:	Clark R Office of Nuclear Reactor Regulation
References
TAC-08291, TAC-8291, NUDOCS 8007090360
Download: ML19320B144 (2)

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July 3, 1980 Trojan Nuclear Plant Docket 50-344 License NPF-1 4

i Director of Nuclear Reactor Regulation ATTN:

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

Washington, D. C.

20555

Dear Sir:

In accordance with your request of March 18, 1980, PGE submitted on June 16, 1980 the additional information relating to the Containment Purge System of the Trojan Nuclear Plant.

Subsequent discussion between PGE and the NRC, Region V 16E Office has identified a necessity for clarification in one of the statements in the PGE submittal.

The PGE response to the Criterion I to the NRC Question 1 indicates that "There is no convenient manner in which the Containment purge valves could be overridden to permit purging when a high radiation level exists in the Containment". Although this statement is adequate, the high radiation signal can be overridden by manually moving the setpoint up to a higher level or by continuously holding in the reset pushbutton on the radiation monitors panel (C-41).

This is the standard feature for any of the monitors available in the industry and this flexibility must be available since the Containment purge radiation monitor setpoint must be readjusted periodically in reistion to the background radiation level (1.5 times background for alert level and i

2.0 times background for alarm level).

It should be noted that the l

valve position will not automatically change by either moving a set-point or holding a reset pushbutton.

Furthermore, a Containment purge can be started only af ter a gaseous discharge permit has been com-pleted and the setpoints are established to ensure that the Tech-nical Specification limits are met.

Another possibility by holding

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Mr. Robert A. Clark July 3, 1980 Pace Two in the reset pushbutton is also considered to be unpractical since it requires a c8ntinuous action until the high radiation signal is cleared.

Based on these factors, we do not consider manual overriding of the high radiation signal to be a convenient manner.

Sincerely,

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C. Goodwin, Jr.

Assistant Vice President Thermal Plant Operation and Maintenance CC/KM/4mg8A2 c:

Mr. Lynn Frank, Director State of Oregon Department of Energy Mr. R. H. Engelken U. S. Nuclear Regulatory Commission Region V