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
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References
FOIA-86-197 NUDOCS 8404020205
Download: ML20209C786 (1)

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UNITED STATES NUCLEAR REGULATORY COMMISSION E

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WASHINGTON, D. C. 20555

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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

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