ML19308B311

Discusses Timeliness of Opening Decay Heat Valves (Dhv) 1 & 171.Premature Opening of Dhv 1 & Dhv 171 Would Not Be Consistent W/Alara Principles Re Maint Being Performed in Dhv 3 Area

ML19308B311
Person / Time
Site:	Crane
Issue date:	11/16/1979
From:	Jay Collins NRC - TMI-2 OPERATIONS/SUPPORT TASK FORCE
To:	Arnold R METROPOLITAN EDISON CO.
References
NUDOCS 7912280362
Download: ML19308B311 (4)

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Docket N 3 50-31g-NRC PDR Iocal PDR T fI Site Reading SEP/THI Reading Docket No. 50-320 NRR Reading PSB Reading JTCollins Mr. R. C. Arnold RHVollmer Senior Vice President FADiBenedetto Metropolitan Edison Company Post Office Box 480 Middletown, Pennsylvania 17057

Dear Mr. Arnold:

There have been several discussions between MET-ED staff and the NRC staff concerning the timeliness of opening Decay Heat Valves (DHV) number 1 and 171. Due to the increasing water level in the reactor building it will be necessary to cpen these valves prior to submergence of any portion of their prima mover mechanisms which have the potential, when submerged, to inhibit the operability of the valves. It is recog-nized by both staffs that op-nintr of DHV-1 and DHV-171 will cause pri-mary coolant contaminants to migrate to DEV-3 which could res&lt in higher than necessary radiation exposures to workers in the area.

Furtharmore, Megger readings routinely being taken on the motor operator continue to be satisfactory with no apparent degradation, water level in containment is rising at a slow enough rate providing several nonths before any action need be taken, and the quality of the equipment is such that there is reasonable assurance that the operability of the valves will not be impaired by the existing environment.

naaed on the above, we conclude that premature opening of DHV-1 and DHV-171, unless technically justified, would not be consistent with the ALARA prin-ciples associated with the maintenance being performed in the area of DHV-3.

Sincerely, John T. Colline Deputy Director TMI Support l

cc:

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i TMI TMI rj PADiBenedetto JTCollins j

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a Mr. R. C. Arnold ce!

Metropolitan Edison Company ATTN:

Mr. J. G. Herbein Vice President Nuclear Operations Three Mile Island Nuclear Station Post Office 3ox 480 Middletown, Pennsylvania 17057 GPU Service Corporation ATTN:

Mr. E. G. Wallace Licensing Henager 100 Interpace Parkway Parsippany, New Jersey 07054 Metropolitan Edison company ATTN:

ltr. G. P. 11111er Manager Suppest Services and bgistics Three Mile Island Nuclear Station Post Office Box 430 Middletown, Pennsylvania 17057 Metropolitan Edison company ATTN:

Mr. J. B. Logan Superintendent Unit 2 Three Mile Island Nuclear Station Post Office Sox 480 Middletown, Pennsylvania 17057 Metropolitan Edison Company ATTN:

Mr. G. A. Kunder Unit 2 Superintendent -

Technical Support Three Mile Island Nuclear Station Post Office Box 480 Middletown, Pennsylvania 17057 l

l Metropolitan Edison Company ATTH:

Mr. J. J. Colitz Manager Plant Engineering Three Mile Island Nuclear Station Post Office Sox 480 Middletown, Pennsylvania 17057 Metropolitan Edison Coupany ATTN:

Mr. R. F. Vilson Director TMI-2 Recovery, Acting Three Mile Island Nuclear Station Eost Office Sox 480 Hiddletown, Pennsylvania 17507

l Mr. R. C. Arnold cc cont'd.:

Jersey Central Power & Light Company ATTN Mr. I. R. Finfrock, Jr.

Madison Avenue at Punch Bowl Road Morristown, New Jersey 07960 Pennsylvania Electric Company ATTN:

Mr. R. W. Conrad 1007 Breed Street Johnstown, Pennsylvania 15907 Shaw, Pittman, Potta & Trowbridge

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ATTN:

Mr. George P. Trowbridge, Esquire 1800 M Street N. W.

Washingtog, D. C.

20036 3erlack, Israel, Lieberman ATT:i:

Mr. J. 3. Lieberman 26 3readway New York, New York 10004 Ms. Mary V. Southard, Chairperson Citizans for a Safe ?nytron= ant Post Office Box 405 Harrisburg, Pennsylvania 17108 l

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