ML19290E908
| ML19290E908 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 12/20/1979 |
| From: | Randy Hall BROOKHAVEN NATIONAL LABORATORY |
| To: | Ferguson R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8003170293 | |
| Download: ML19290E908 (2) | |
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5 BROOKHAVEN NATIONAL LABORATORY C;l 3 l ASSOCIATED UNIVERSITIES, INC.
4 g 2J u Upton, New York 11973 Department of Nuclect Energy (516) 345 2362 December 20, 1979 Mr. Robert L. Ferguson Plant Systems Branch U. S. Nuclear Regulatory Conmission Washington, D. C.
20555
Subject:
Haddam Neck Fire Protection Review, Item 3.1.4(5)
Dear Bob:
The subject item is a continuation of the " catch-up" design review and supplementary items for Team 2.
These are due to be completed by BNL on January 7, 1980. This item number did not appear on the schedule agreed to in Washington at our recent meeting, but does appear in the SER.
Please add it to your schedules.
I understand that this forma.t is satisfactory for 3.1 items where the item is not acceptable and a recommendation is to be made by us.
We have asked Mr. Antonetti to review the pressure drop in the 4" line to determine the final available water pressure for the turbine building hose station in case of a loss of the main 12" feed.
Very truly,ours, Robert E. Hall, Group Leader Reactor Engineering Analysis REH/EAM/sd Attachment cc:
R. Cerbone L. Derderian (w/ attach)
R. Hall W. Kato V. Panciera 1
8003170 RG)
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HADDAM NECK Fire Protecticn Review 3.1.4(5) Hose Stations The licensee was requested in the SER to provide an additional feed from the yard loop to the turbine building hose stations. With the proper valving this feed would make the hose stations independent from the automatic and manual suppression systems. The licensee cc
'd this deficiency by in-stalling a 4-inch feed from the turbine builoi..g connection to the underground, through the turbine build'ng and connecting this to the hose stations. This satisfies the concern for the independent feeds of the automatic and manual suppression and hose stations, but a coacern exists on the single feed capable of supplying the water demand for turbine sprinklers. A break in the under-ground feed imoairs all the automatic and manual suppression systems protecting safety-related areas or areas exposing safety-related areas.
The 4-inch supplementary feed does not appear to have sufficient carrying capacity to supply the various water demands.
Staff Concern Only a single feed of adequate capacity supplies fire water from,the underground fire loop to the turbine building manifold. The manifold supplies six deluge systems and two sprinkler systems. Most of these systems provide protection for the turbine building and special hazards within the turbine building. A break in the underground feed to the manifold would impair the systems due to the inability of the 4-inch connection from the service building to supply ad-equate water and pressure to meet system water demands.
The loss of we turbine building due to a fire would have adverse effects on safety-related areas adjacent to this building. The walls separating the tur-bine building from switchgear rooms and cable spreading areas are not fire walls. A collapse of structural steel members in the turbine building would cause the loss of wall integr'ty and allow fire to affect these safety-related areas.
Staff Position An additional 12-inch underground feed should be installed from the fire loop to the turbine building manifold system.
Additional valving should be provided so that a break in either of the 12-inch feeds would not affect the water supply to the manifold in the turbine building.