ML19351A216

Advises of 810624 Meeting to Discuss ASLB 810526 Decision Concerning Hydrogen Control Sys.Questions to Be Addressed Listed

ML19351A216
Person / Time
Site:	McGuire, Mcguire
Issue date:	06/23/1981
From:	Bickwit L NRC OFFICE OF THE GENERAL COUNSEL (OGC)
To:	Ketchen E NRC OFFICE OF THE EXECUTIVE LEGAL DIRECTOR (OELD)
References
NUDOCS 8106260303
Download: ML19351A216 (1)

Text

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/b Edward G. Ketchen, Esq.

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Counsel for NRC Regulatory Staff g

office of the Executive Legal Director U.S. Nuclear Regulatory Commission Washington, D.C.

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Dear Mr. Ketchen:

The Commission has scheduled an open meeting for. Wednesday, June 24, 1981 at 2:00 p.m. as part of its consideration whether the Licensing Board's May 26, 1981 decision should become effective.

At this meeting the Commission requests that the parties 'ddress orally the following questions:

1.

In view of the fact that substantial quantities of hydrogen were evolved during the TMI accident before containment pressure s'ignificantly exceeded 3 psig, what is the basis for selecting the 3 psig containment pressure signal as the appropriate Should trigger for energizing the igniter system?

the trigger instead be safety injection?-

2.

In vit, of the fact that the effectiveness of the hydrogen conerol system depends in part on opera-tion of air return fans and the hydrogen skimmer fans in conjunction with the igniters, is it rea-sonable to switch on the igniters at a lower pressure than the trigger set point for the air return fans and the hydrogen skimmer fans?

Is it feasible to switch on the air return fans and hydrogen skimmer fans at containment pressures less than 3 psig without the possibility of nega-tive containment pressure or other adverse factors?

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Sincerely, 5 2 5 $81 m fg 0k TD%s:

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0 Leonard Bickwit, Jr.

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General Counsel

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