ML20209C786

Informs of Rereview of Followup Item of Sser 20 Re Environ Qualification of Motor Capacitor in electro-hydraulic Actuator on Motor Driven Auxiliary Feedwater Pump Flow Control Valves.Original Evaluation Acceptable

ML20209C786
Person / Time
Site:	Diablo Canyon
Issue date:	03/16/1984
From:	Parr O Office of Nuclear Reactor Regulation
To:	Noonan V Office of Nuclear Reactor Regulation
Shared Package
ML17083B484	List: ML20209C687 ML20209C692 ML20209C725 ML20209C729 ML20209C734 ML20209C742 ML20209C774 ML20209C779 ML20209C786 ML20209C810 ML20209C853 ML20209C869 ML20209D170 ML20209D204 ML20209D416 ML20209D421 ML20209D450 ML20209D560 ML20209D649 ML20209D703 ML20209D864 ML20209D903 ML20209E021 ML20209E030 ML20209E037 ML20209E052 ML20209E145 ML20209E211 ML20209E268 ML20209E506 ML20209F952 ML20209G177 ML20210E664 ML20210E745 ML20210E799 ML20210E811 ML20210E916
References
FOIA-86-197 NUDOCS 8404020205
Download: ML20209C786 (1)

Text

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paunqjo,, UNITED STATES 4 NUCLEAR REGULATORY COMMISSION E o WASHINGTON, D. C. 20555 h -

,/ mas 1 ; y cm MFMORANDUM FOR: Vincent S. Noonan, Chief, Equipment Qualifications Branch, Division of Engineering FROM: Olan D. Parr, Chief, Auxiliary Systems Branch, Division of Systems Integration SUB.1ECT: DIABLO CANYON UNIT 1, SSER 20, FOLLOWUP ITEM 5 In accordance with your request dated March 14, 1984, we have rereviewed the documentation concerning followup item 5 of SSER 20 for Diablo Canyon, Unit 1.

This item involves environnental qualification of the motor capacitor in the electro-hydraulic (E/H) actuator on the motor driven auxiliary feedwater (AF!!)

punp flow control valves. Our review is based on the information contained in the notes for Table 3.ll-1A provided in FSAR Amendment 69 (September 1978).

From the discussion in the above reference, we conclude that no more than two E/H valve actuators are affected by any single high energy line break environment. Therefore, a concurrent single active failure will not prevent the delivery of sufficient auxiliary feedwater by the turbine driven AFW pump or the unaffected motor driven pump to at least two intact steam generators, and thus a safe shutdown can be achieved. We therefore conclude that the E/H valve actuators are not required to be cualified to a high energy line break environ-ment. Further, the original staff evaluation on this subject contained in SSER No. 9 dated June 13, 1980 is still acceptable.

I a b. ar.r, Chief Auxiliary Systems Brar.ch Division of Systems Integration cc: R. Mattson L. Rubenstein T. Novak J. P. Knight G. Knighton R. LaGrange J. Wermiel H. Schierling H. Walker

Contact:

J. Wermiel X29462 (f0L f)

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