ML19276F673
| ML19276F673 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 03/15/1979 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Roe L TOLEDO EDISON CO. |
| References | |
| TAC-11005, NUDOCS 7904060420 | |
| Download: ML19276F673 (2) | |
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UNITED STATES
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March 15,1979
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Doc!et No. 50-346 Mr. Lowell E. Roe Vice President, Facilities Development Toledo Edison Company Edison Plaza 300 Madison Avenue Toledo, Ohio 43652
Dear Mr. Roe:
Condition E.C.(3)(e) of the Davis-Besse Nuclear Power Station, Unit No.1 Operating License (NPF-3) requires that you modify, to the satisfaction of the Cormiission, the reactor coolant system flow indication to meet the single failure criterion with regard to pressure sensing lines to the flow differential pressure transmitters.
In a telephone conversation on March 13, 1979, our staff discussed this license condition with your office and reviewed our position on a similar condition for the operating license of Florida Power Corporation's Crystal River Unit No. 3.
Our position, which applies to the Davis-Besse Unit No.1 as well as the Crystal River Unit No. 3, is that a satisfactory modification to the RC flow sensing sysf.em, for single failure considerations, would be the installation of a/ redundant set of sensing lines (one high pressure and one low pressure)'for each reactor coolan' loop. These sensing lines would serve two of the four existing differential) pressure transmitters and should connect to the existing sensing lines immediately downstream of the first root valve off the reactor coolant loop. The piping run of the new sensing lines should be physically separated from the existing lines.
You are requested to inform us within 30 days of receipt of this letter whether you intend to pursue installation of the additional sensing lines as discussed above or some other means of addressing the license condition.
Sincerely, w
Robert W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors cc: See next page geo4066W
<Y s Toledo Edison Company cc:
Mr. Donald H. Hauser, Esq.
The Cleveland Electric Illuminating Company P. O. Box 5000 Cleveland, Ohio 44101 Gerald Charnoff, Esq.
Shaw, Pittman, Potts and Trowbridge 1800 M Street, N.W.
Washington, D.C.
20036 Leslie Henry, Esq.
Fuller, Seney, Henry and Hodge 300 Madison Avenue Toledo, Ohio 43604 Mr. Robert B. Borsum Babcock & Wilcox Nuclear Power Generation Division Suite 420, 7735 Old Georgetown Road Bethesda, Maryland 20014 Ida Rupp Public Library 310 Madison Street Port Clinton, Ohio 43452 4