ML20140G510

Forwards NRC 780105 Memo Evaluating Util Submittals Re multiple-subsequent Actuations of safety-relief Valves in Mark I Plants.Sample Ltr Requesting plant-unique Assessment of Effects of Actuations Encl

ML20140G510
Person / Time
Issue date:	03/02/1978
From:	Eisenhut D Office of Nuclear Reactor Regulation
To:	Goller K Office of Nuclear Reactor Regulation
Shared Package
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References
FOIA-85-665 NUDOCS 8604020440
Download: ML20140G510 (2)

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% .,, . # MAR 9 21973 MEMORANDUM FOR:

K. R. Goller, Assistant Director for Operating Reactors Division of Operating Reactors FROM:

D. G. Eisenbut, Assistant Director for Operational Technology, Division of Operating Reactors

SUBJECT:

STAFF POSITIONS ON MULTIPLE-SUBSEQUENT ACTUATIONS OF SAFETY-RELIEF VALVES IN MARK I PLANTS In a meeting on October 27, 1977 the Mark I Owners Group and General Electric (GE) presented the staff with an assessment of the potential consequences of multiple-subsequent actuations of safety-relief valves (SRVs) during transient isolation events at Mark I BWR facilities.

The purpose of this meeting was to cbtain an understanding of the implications, for operating Mark I BWR facilities, of a BWR-6 design deficiency identified by GE pursuant to 10 CFR Part 21. At the conclusion of the meeting, the staff requested that each utility submit its basis for continued plant operations by November 1,1977.

We have reviewed the licensees' submittals in conjunction with the material presented by GE during the October 27, 1977 meeting. The results of this review are discussed in the enclosed memorandum (Enclosure 1). .

We have determined that a plant-unioue assessment of the effects of multiple-subsequent SRV actuations should be performed by each licensee, using the criteria identified in Enclosure 1, to support continued operation of their facility while the Mark I Containment Long-Term Program is being conducted. We have, therefore, prepared a sample letter (Enclosure 2) f'irr transmittal to each of the Mark I BWR licensees requesting such a plant-unique sessment. ,-

C- d h #.4L s D. G. Eisenhut, Assistant Director

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Enclosures:

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