ML19329A927
| ML19329A927 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 08/07/1975 |
| From: | Schwencer A Office of Nuclear Reactor Regulation |
| To: | Roe L TOLEDO EDISON CO. |
| References | |
| NUDOCS 8001150823 | |
| Download: ML19329A927 (4) | |
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L PDR Docket File LWR 2-3 Rdg Docket No.:
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ELD The Toledo Edieon Company IE (3)
ATTN:
Mr. Ioww11 E. Roe LEngle Vice President, Facilities EGoulbourne Development TR BCs Edison Plaza LWR BCs 300 Madison Avenue ACRS (16)
Toledo, Ohio 43652 WMcDonald Gentlemen:
We are presently reviewing the ECCS containment pressure calculations provided in BAN-10105, "ECCS Evaluation of B&W 177 FA Raised Loop NSS",
which you have referenced for the Davis-Besse Nuclear Power Station, Unit 1 ECCS evaluation.
We find that the containment input parameters selected for use in m _ _
BAU-10105 have not been justified as being conservative for the ECCS containment pressure calculation for Davis-Besse, Unit 1.
Pursuant to Appendix K,10 CFR 50, justification must be provided for passive hent sinks and other significant containment parameters.
..ca We request justification be provided by co=pating the input parameters used in 3AW-10105 with the appropriate values for the Davis-Besse Nuclear Power Station, Unit 1.
Additional information required for justifying these parameters is provided in the enclosure to this letter.
The Licensing Project Manager, L. Engle, has already informed Mr. E. Novak, General Superintendent-Power Engineering and Construction, by telephone conversation on July 25, 1975, as to the contents of the additional inf aruation requested.
In order to maintain our licensing schedule, we will need your responnes by September 1, 1975. If you cannot s!eet the response date, please inform us within seven days af ter receipt of this letter so that we may revise our scheduling.
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~2-Please contact us if you have any questions regarding the enclosure p rovidad.
Sincerely, Ortzini Ugsed by A. Schwancer, Chief Light Water Reactors Branch 2-3 Division of Reactor Licensing
Enclosure:
Raquest for Additional Information ces: Donald H. Hauser, Esquire The Cleveland Electric Illuminating Co.
P. O. Box 5000, Poem 610 Cleveland, Ohio 44101-Cerald Charnoff, Esquire Shaw, Pittman, Potts, Trowbridge and Madden 910 - 17th Street, N. W.
Washington, D. C.
20006 Leslie Henry, Esquire Fuller, Seney, Henry & Hodge 300 Madison Avenue Toledo, Ohio 43604 becs:
J. 2. Buchanan, ORNL T. B. Abernathy, DTIE D**O aoE o i)
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REOUEST FOR ADDITIONAL INFORMATION DAVIE BESSE, UNIT 1 DOCKET NO. 50-346
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The ECCS analysis for our plant is referenced to BAW-10105.
Provide I
s justification for the followusg input parameters used in BAH-10105 by comparison with the appropriate values for your plant:
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1.
Net Free Containr.ent Volume - Justification should include the total gross internal containment volume and the internal structures and equip-ment and their volumes which are subtracted to obtain the net free containment volume. A discussion of the uncertainties should be pro-vided.
2.
Passive Heat Sinks _ - Provide the actual passive heat sink structures for your plant.
Discuss the method of determining the passive contain-ment heat sinks.
Identify each heat sink by category (i.e., cable tray, ecuipment supports, floor grating, crane wall, etc.) and provide 4
surface area, thickness, materials of construction, thermal conductivity and volumetric heat capacity, by component category used in the containment transient analysis code.
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3.
Starting Time of Centainment Ccoling System (s)_ - Discuss the factors that show that the start time (s) assumed in tha containment response j
analysis represent the esrliest possible initiation of system (s) cperation.
4.
Containment Initial Conditions - Ccmpare the initial values of temperature, pressure and relative humidity in the containment with the range of values that will be permitted during plant operation.
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' Containment Soray Water Temoerature - Shod tpat the value of containment 5.
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spray water temperature used in the' cbntainment respcnse analysis is the lower bound temperature consistent with plant operating conditions and that the spray ficw rate used is suitably conservative.
6.
Fan-Cooler Heat Removal Rate - Compare the maximum fan-cooler L
.6 removal rate for Davis-Besse 1 with that assumed in BAU-10105.
Show that minimum operational values of service water temperature have been used.
I 7.
If any of the above parameters are less conservati e for your plant than used in the generic evaluation of BAN-10105, provide the sensitivity of these parameters to the overall containment pressure respcnse. This evaluation should demonstrate the overall conservatism of your containment parameters to those used in BAU-10105.
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