ML19319C221
| ML19319C221 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 12/15/1976 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Roe L TOLEDO EDISON CO. |
| References | |
| TAC-11005, NUDOCS 8002060786 | |
| Download: ML19319C221 (2) | |
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Docket File
.H. Vollmer NRC PDR W. P. Gammill Local PDR C. Miller LWR-1 File T. Ippolito D. B. Vassallo ELD DEC 151976 F. J. Williams IE (3)
J. Stolz ACRS (16)
L. Engle N. Butler
%cket No. 50-346 E. Hylton F. Rosa R. Heineman K. Goller D. Ross Toledo Edison Company J. Knight, SS ATTN: Mr. Lowell E. Roe R. Tedesco Vice President, Facilities V. A. Moore Development H. Denton Edison Plaza M. L. Ernst 3JO Madison Avenue bec:
J. R. Buchanan, NSIC Toledo Ohio 43652 Thomas B. Abernathy, TIC Gentlemen:
STAFF FOSITIONS ON TliE PRESENT DAVIS DESSE, UNIT 1 P.EACTOR COCLNiT FLOW TRANSMITTERS At cur site visit to Davis Besse, Unit 1 on October 6, 7 and 3,1976, it was observed that a single failure in the reactor coolant flow / axial power protection function could cause a loss of that protection function.
Your present design of all foar redundant coolant flow transmitters measuring ficw in each loop to the steam generator, which are cart of the reactor coolant system flow and axial power imbalance protection function, share common process sensing lines to the reactor coolant flow tube. A failure of a comon sensing line could result in reactor creration outside of acceptable limits described in Figure 2.2-1 of tne proposed Technical Specifications.
It is our position that the design of the reactor coolant ficw paraneters be modified to meet the single failure criterion in order to preclude loss of the reactor coolant flow / axial power protection function.
We request that you provide your response to our position within 15 days after receipt of this letter. Your response should include the details of the design modification and your schedule for tne completion of its installation.
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Toledo Edison Com;:any,
1-Please call us if you have any cuestions concerning these matters.
Sincerely.
Original Signed by John F. Stols John F. Stolz, Chief Light Water Reactors Branch No. 1 Division of Project Management cc-Mr. Donald H. Hauser, Esq.
The Cleveland Electric Illuminating Company P. O. Box 5000 Cleveland, Ohio 44101
' said Charnoff, Esq.
Siia>i, Pittcan, Potts and Trowbridge 1000 M Street,fi. U.
Wasaington, D. C.
20036 Leslie llenry, Esq.
Fuller, Seney, Henry and Hodge 30] Madison Avenue Toledo, Ohio 43604 g =
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