ML19256G458

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Forwards Correction to Conceptual Design for Initiation & Control of Emergency Feedwater Independent of Integrated Control Sys,Per NUREG-0578.Requests Approval.Eight Oversize Drawings Encl
ML19256G458
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 12/18/1979
From: Trimble D
ARKANSAS POWER & LIGHT CO.
To: Reid R
Office of Nuclear Reactor Regulation
References
RTR-NUREG-0578, RTR-NUREG-578 1-129-14, NUDOCS 7912310335
Download: ML19256G458 (10)
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{{#Wiki_filter:** - ARKANSAS POWER & LIGHT COMPANY POST OFFICE BOX 551 UTTLE ROCK. ARKANSAS 72203 (501) 371-4000 December 18, 1979 l-129-14 Director of fluclear Reactor Regulation ATTN: Mr. R. W. Reid, Chief Operating Reactor Branch #4 U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Subject:

Arkansas Nuclea.r One-Unit 1 Docket No. 50-313 License No. DPR-51 Auxiliary (Emergency) Feedwater Control System (File: 1510.1) Gentlemen: By letter dated October 31, 1979, Arkansas Power & Light Company provided a conceptual design for initiation and control of emergency feedwater (EFW) independent of the Integrated Control System (ICS). Figure 1 of that letter provided the initiation and control logic to be utilized in the design. This letter provides a correction to Figure 1, and a schematic of the proposed de-sign. Your expeditious approval of this conceptual design is necessary to allow compliance with Item 2.1.7.a of NUREG-0578. May we have your concurrence as soon as possible? Very truly yours, basi ( FA David C. Trimble Manager, Licensing DCT:DGM:nak Attachment 1664 034 .~ 912816 MEMBEA MOOLE SOUTH UTILITIES SYSTEM

FIGURE 1 EFW INITIATION 'LOFW Trip Bypassed \\ Rx Power < 5% FP b Both FW Turbines Tripped Start EFW Pump ' A' Loop 'A' OTSG Level < 18 inches All RCP's Tripped Train ' A' Initiation (Duplicate for Train 'B') EFW CONTROL OTSG Level (>) 60% Operate Range All RCP's Tripped O 00en Disch. Valve CV-2670 OTSG Level ( > ) ~10!; Start-Up Range Q (Close Disch. Valve) All RCP's Not Tripped Train ' A' Control (Duplicate for Train 'B', CV-2620) 1664 035

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