W3P84-3325, Forwards Associated Circuits Analysis, for Review,Per Util 840517 Commitment.Study Addresses NRC Concerns Re Spurious Actuation Raised During Fire Protection Special Safety Insp 50-382/84-20 on 840409-13

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Forwards Associated Circuits Analysis, for Review,Per Util 840517 Commitment.Study Addresses NRC Concerns Re Spurious Actuation Raised During Fire Protection Special Safety Insp 50-382/84-20 on 840409-13
ML20100A013
Person / Time
Site: Waterford Entergy icon.png
Issue date: 11/30/1984
From: Cook K
LOUISIANA POWER & LIGHT CO.
To: Knighton G
Office of Nuclear Reactor Regulation
Shared Package
ML20100A017 List:
References
W3P84-3325, NUDOCS 8412030425
Download: ML20100A013 (2)


Text

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k MIDDLE SOUTH P O W E R & Li G H T ! N.sw oALeANS LoulSIANA 70174-8000 S (504) 300-=345 UTIUTIES SYSTEM November 30, 1984 W3P84-3325 3-A1.01.04 Q-3-P43 A4.05 Director of Nuclear Reactor Regulation Attention: Mr. G.W. Knighton, Chief Licensing Branch No. 3 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555

SUBJECT:

Waterford SES Unit 3 Docket No. 50-382 ASSOCIATED CIRCUITS ANALYSIS BEFERENCES: (1) Letter W3P84-1412 from K.W. Cook (LP&L) to G.W. Knighton (NRC) dated May 17, 1984 (2) I.E. Inspection 50-382/8420 dated July 9, 1984

Dear Mr. Knighton:

Attached please find the Associated Circuits Ar.alysis for your review as committed to in Reference 1. This study addresses the spurious actuation concerns raised by NRC reviewers during the Fire Protection Special Safety Inspection (Reference 2) conducted April 9-13, 1984 at Waterford SES Unit Number 3.

This report evaluated the ef fect on safe shutdown of spurious actuation of essential and non-essential components caused by a fire condition in the Control Room / Cable Vault area, the Relay Room Isolation Panel, and individual plant fire areas. As a result, some isolation switches and cable rerouting as well as operator actions will be required to mitigate the effects of worst-case spurious actuations. Accordingly, these modifications including necessary procedure revisions will be completed prior to startup following the first refueling outage as previously agreed in Reference 1 and as required by Reference 2. The conservatism of the assumptions utilized in this analysis (i.e. loss of offsite power, total loss of all control room components, loss of all automatic functions and worst-case spurious signals) affirm that the schedule for completing modifications will not significantly impact the public health and safety beyond that level of protection provided by Waterford 3's current compliance with Append.1x E and related fire 1L 8412030425 841130 '

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W3P84-3325 Mr. G.W. Knighton Page 2 protection regulatory requirements. Recently completed modificutions which insure electrical independence from the control room for the Emargency Diesel Generator B, Pressurizer Proportional Heater Bank 2, process monitoring '

instrumentation and Atmospheric Steam Dump Valves in conjunction with procedure revisions assure the capability of Waterford 3 operators to safely bring the plant to cold shutdown conditions from outside the control room.

In addition, in-depth fire protection features including extensive automatic suppression coverage outside the control room have been implemented to insure that at least one train of safe shutdown equipment will remain free of fire damage.

We trust that this report will satisfy the requirements of Open Item 382/8420-07 of Reference 1. Should you have any questions in regard to this analysis please contact our fire protection licensing engineer, Kevin Curley, at (504) 595-2845.

Very truly yours, K. W. Cook Nuclear Support & Licensing Manager KWC/KhC/ch Attachments cc: E.L. Blake, W.M. Stevenson, D.M. Crutchfield, J. Wilson, J. Weirmiel, R.D. Martin, G.L. Constable l

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