ML20053C569

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Forwards Addl Info Re Seismic Qualification of Emergency Feedwater Sys Per NRC 820429 Request
ML20053C569
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 05/27/1982
From: John Marshall
ARKANSAS POWER & LIGHT CO.
To: Clark R
Office of Nuclear Reactor Regulation
References
NUDOCS 8206020328
Download: ML20053C569 (2)


Text

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ARKANSAS POWER & LIGHT COMPANY POST OFFICE BOX 551 LITTLE ROCK ARKANSAS 72203 (501) 371-4000 May 27, 1982 2CAN058212 Director of Nuclear Reactor Regulation ATTN: Mr. Robert A. Clark, Chief Operating Reactors Branch #3 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Subject:

Arkansas Nuclear One - Unit 2 Docket No. 50-368 License No. NPF-6 Seismic Qualification of Emergency Feedwater System - Additional Information Gentlemen:

The attachment to this letter provides the additional information requested in your letter of April 29, 1982 (2CNA048204) regarding seismic qualification of the emergency feedwater system for ANO-2.

Very truly yours, John R. Marshall l

Manager, Licensing l

JRM:JK:s1 Attachment l

l l

l 8206020328 820527 6 PDR ADOCK 05000368 MEMBEF1 MIDDLE SOUTH UTILITIES SYSTEM fj

Arkansas Nuclear One - Unit 2 Seismic Qualification of Emergency Feedwater System Response to NRC's 4/29/82 Request for Additional Information Que v. ion 1: " Clarify the extent to which your AFW system boundary, considered in your August 7, 1981 response letter, coincides with the boundary defined in GL 81-14."

Response 1: As stated in the ANO-2 FSAR Section 10.4.9.3:

"The EFS is designed to remain functional after a DBE.

The pumps, valves, SWS supply lines and the discharge piping are all designed, fabricated and hydrostatically tested to meet the applicable requirements for ASME Code Section III, Class 3 and Seismic Category I components with the exception of isolation valves (2CV-1036, 1037, 1038 and 1039) and downstream piping which are designed, fabricated and tested to meet the applicable requirements for ASME Section III, Class 2 and Seismic Category I components. The condensate water supply line and the flush and recirculation lines downstream of the first isolation valves are designed to ANSI B31.1.0 requirements. The pumps and components of the EFS are all Seismic Category I and are installed within the Seismic Category I Auxiliary Building."

Suction for the EFW system can be taken from either the Startup and Blowdown Demineralizer effluent or the in-use condensate storage tank.

However, if off-site power and condensate storage water are unavailable, suction automatically transfers to the Seismic Category I Service Water System (SWS). The EFW system is served by a Seismic Category I power supply.

Question 2: Clarify the extent to which your AFW system is included within the scope of seismic related Bulletins 79-02, 79-04, 79-07, 79-14 and 80-11, and IE Information Notice 80-21. ,

Response 2: The Emergency Feedwater System', being a safety related Seismic Category I system, was included in the actions required in Bulletins 79-02, 79-04, 79-07, 79-14 and 80-11, and in IE Information Notice 80-21.

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