ML19329B314
| ML19329B314 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 11/15/1976 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Roe L TOLEDO EDISON CO. |
| References | |
| NUDOCS 8002040739 | |
| Download: ML19329B314 (2) | |
Text
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.s Docket FiL [f 99 Distributi 1 O D"'
W. P. Gammill
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q' r myq NOV 15 1976 Local PDR IE (3)
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i LWR 1 File V. Benaroya gj u(
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D. B. Vassallo ACRS (16)
F. J. Williams
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J. Stolz Docket tio. 50-346 L. Engle
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E. Hylton R. Heineman Toledo Edison Company D. Ross bec:
J. R. Buchanan, ATTil: :ir. Lowell E. Roe J. Knight, SS flSIC Vice President. Facilities R. Tedesco T. B. Abernathy, Development H. Denton TIC Edison Plaza V. A. floore 300 Madison Avenue R. H. Vollmer Toledo, Ohio 43652 ti. L. Ernst Gentlemen:
DIVERSE ELECTRIC PONER SDURCE TO AUXILIARY FEEDWATER PUMP TURBI?lE STEAM SUPPLY VALVES AND FEEDUATER PLMP DISCHARGE LI;iES - DAVIS BCSSE, U: LIT 1 On October 29, 1976, we discussed with you the open ite'ns as Dresently existing for Davis Besse, Unit 1.
Among the items discussed was our position regarding diversity in the electric power source to the valve operacors for the auxiliary feedwater pump turbine steam supply valves and feedwater pump suction and discharge lines.
Our position, as stated in the Davis Besse, Unit 1 Safety Evaluation Report, is that we require power diversity be provided in the auxiliary feedwater system to assure that functional operability of one redundant train is maintained in the event of loss of all alternating current power. For tnis application tne two turbine drives for the auxiliary feedwatcr pumps are acceptable.
Our basis for this requirement is to make the probability of failure of the auxiliary feedwater system to be able to remove reactor core decay hea't acceptably small in the event of loss of all alternating current power.
I We have determined also, that modification of the system to provide diverse power can reasonably be left for accomplishmeat prior to the coranencement of the second cycle of fuel operation. The basis for this determination is that the probability of occurrence for loss of all alternating current power is sufficiently remote to allow safe operation for the interval of time to the second cycle of fuel operation.
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Form AEC.318 (Rev. 2 53) AECM C240 W u. s. eOYERNMENT PRINTING OFFICE 81974 886164 s oo2 040W
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Toledo Edison Company.
NOV 15 1976 Therefore, as will require t.at the auxiliary feedwater system be modified, prior to the conr.1encement of the second cycle of fuel operation, to provide diverse power to the applicable notor operated valves so that one auxiliary feedwater train can be operated in the event of loss of all alternating current power to the system.
We request that you provide your response and schedule to our position witain 15 days rcccipt of this letter.
Please call us if you have any questions regarding these matters.
Sincerely, original signed by' John F. Stolz John F. Stolz, Chief Light Water P.eactors 3 ranch 'Io.1 Division of Project Managenent cc: lIr. Donald H. Hauser, Esq.
The Cleveland Electric Illuminating Company P. O. Box 5000 Cleveland, Ohio 44101 Gerald Charnoff, Esq.
Shaw, Pittnan, Potts and Trowcridge 1000 11 Street, N. W.
Washingt6n, D. C.
20036 E
Leslie lienry, Esq.
D Fuller, Seney, Henry and Hodge O
s1 300 !tadison Avenue ov D ~9
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- u. s. oovERNMENT FRINTING OFFICEB1974 938184
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