ML20235E726

Requests Addl Info,Including Program for Lubricating Oxygen Sampling Sys Isolation Valves,Analysis of Cause of Two Automatic Isolation Valves in Series Failure to Close,Based on Review of

ML20235E726
Person / Time
Site:	Dresden, Quad Cities, 05000000
Issue date:	11/15/1972
From:	Skovholt D US ATOMIC ENERGY COMMISSION (AEC)
To:	Butterfield L COMMONWEALTH EDISON CO.
Shared Package
ML20235B311	List: IA-87-111, Submits Rept on Plant,As Discussed in ACRS 150th Meeting on 721012-14.Listed Items Can Be Resolved During Const & Facility Can Be Constructed W/Reasonable Assurance for Operation W/O Undue Risk to Public Safety IR 05000254/1972009 IR 05000358/1972003 IR 05000358/1973001 IR 05000358/1973002 IR 05000358/1973003 IR 05000358/1973005 IR 05000358/1973006 IR 05000358/1973007 IR 05000358/1974001 IR 05000358/1974002 IR 05000358/1974003 IR 05000358/1975004 ML20235B308 ML20235B364 ML20235B401 ML20235B405 ML20235B424 ML20235B456 ML20235B461 ML20235B465 ML20235B477 ML20235B488 ML20235B507 ML20235B552 ML20235B582 ML20235B585 ML20235B588 ML20235B605 ML20235B618 ML20235B623 ML20235B649 ML20235B656 ML20235B662 ML20235B670 ML20235B679 ML20235B683 ML20235B687 ML20235B702 ML20235B708 ML20235B713 ML20235B714 ML20235B718 ML20235B720 ML20235B730 ML20235B734 ML20235B748 ML20235B754 ML20235B762 ML20235B764 ... further results
References
FOIA-87-111 NUDOCS 8709280244
Download: ML20235E726 (2)

Text

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NOV 15 *e72 Do * 'Nos. 50-237, 50 249, 50 254 r.d 50-265

. t Comonwealta Edison Company i -' ATTN fir. L. D. Butterfield, Jr.

Nuclear Licensing Administrator Post Office Box 767 Chicago, Illinois 60690 Genticmen.

Your letter of June 23,1972 (W. Worden to E. Dioch) , informed us of valve failures during a test of a Dreadca 2 containment instrument line. In subsequent conversations with you, we discussed the safety significt.co of the failure and additional. corrective actions t> be taken. Essed on our review of your letter and on subsequent discussions, we request that you submit the following information for Dresden Units 2 and 3 and as applicaolo for Quad-Citics Units 1 and 2:

1. Your program for lubricating oxygen sampling system isolation j valves.

l le 2. Tour analysis of the cause of two automatic icolation vn3ves j in seriou failure to close and your evaluation of the

possibility of similar valve failures in the oxygen analyzer or other systems.

3. It is our understanding that containment integrity could bc lost by the rupture of a tube in the oxygen analyzer system {

if the particulate sampling linea are open uhcn the contain- ]

ncnt is pressurized. If this is correct, we request that i

'you either:

a. modify the sampling system and test its capability to withstand full accident pressure, or

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b. provide means for automatic isolation of the particulate sample lines or. oxygen analyzer or provida remote manual isolation with a procedure specifying when the valves are to be closed, or. ,

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c. verify by calculation that the mari== leakage through the oxygen analyzer would not add significantly to accident doses.

We request that you submit this information within 60 days from the date of this letter

• ch one signed and fif ty nine additional copies.

Sincerely',

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.'i Donald J. Skovholt Assistant Director for Operating Reactors Directorate of Licensing cca John W. Rowe, Esquire i Ioham, Lincoln & Bccle . Distribution l l Counselors at Lev docket File One First National Pla::a PDRs y Chicago, Illinois 60670 Locak PLRs

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l RP Reading Mr. Charlos Whitmore Branch Reading President and Chairman ACRS (16) .#

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