ML19329A307
| ML19329A307 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 08/07/1975 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8001020881 | |
| Download: ML19329A307 (3) | |
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i AUG 7 1975 Docket Nos. 50-269/270.287
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Y. Stallo, Assistant Director for Reactor Safety. TR t
REQUEST FOR ADDITIONAL INFORMATION - OODNER NUCLEAR STATION, UNIIS 1, 2, & 3 i
Plant Name Oconee Nuclear Station. Units 1, 2, & 3 Docket Nos.:
50-269/270,287 Licensing Stage OL NSLS Suppliers Babcock & Wilcox Containment Type Dry Architect Engineer Duke Power Company Responsible Branch & Pr6 ject Managers RSBs G. Masatis Raquested Completion Date October 1,1975 Eaview Status Incomplete l
The Containment Systems Branch is reviewing the containment pressure calculations used for the ECCS evaluation of Oconee Nuclear Station.
Units 1, 2, & 3, dated July 9, 1975. The applicant references Topical Report "ECCS Evaluation of B&W's 177-FA Lowered Loop NSS" RAW-10103, for its ECCS evaluation.
The contain==at input parameters selected for use in BAW-10103 have not been sufficiently justified as being conservative for the BCCS containment pressure calculation of Oconee. For operating licensing we require that justification be presented for the passive heat sinks and the other significant containment parameters.
A list of the additional information required for Oconee is enclosed.
Originnt strned h7:
Robert L Tedueco Robert L. Tedesco. Assistant Director for Containment Safety Division of Technical Review t
Enclosures As stated S. Varga cc S. Hansuer J. Endrick
. File R. Heineman A. Gisabusso J. Shapaker NRR Readig' File CS Reading W. Jensen t
W. Mcdonald CSB Reading File P. Eisenhut J. Glynn Docket File ' ' ~ '
~ i C. Anderson G. Masetia T. Novak R. Purple E.' L2inas n
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REQUEST FOR ADDITIONAL INFORMATION OCONEE NUCLEAR STATION. UNITS 1. 2. & 3 DOCKET NOS. 50-269/270.287 The ECCS analysis for your plant is referenced to BAW-10103. Provide justification for the following input parameters used in BAW-10103 by comparison with the appropriate values for your plant.
1.
Net Free Containment 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-a vided.
2.
Passive Heat Sinks - Provide the actual passive heat sink structures for your plant. Discuss the method of detemining the passive contain-ment heat sinks.
Identify each heat sink by category (i.e., cable tray, equipment supports, floor grating, crane wall, etc.) and provide 3
surface area, thickness, materials of construction, thermal conductivity and volumetric heat capacity, by component category used in the containment transient analysis code.
3.
Starting Time of Containment Cooling System (s) - Discuss the factors that show that the start time (s) assumed in the containment response analysis represent the earliest possible initiation of system (s) operation.
4.
Containment Initial Conditions - Compare the initial values of temperature, pressure and relative humidity in the containment with the range of values that will be permitted during plant operation.
.5.. Containment Spray Water Temperature - Show that the value of containment i
spray water temperature used in the containment response analysis is the lower bound temperature consistent with plant operating conditions and veggsamp, j (P
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. that the spray flow rate used is suitably conservative.
6.
Pan-Cooler Heat Removal Rate - Compare the maximum fan-cooler heat removal rate for Oconee with that assumed in BAW-10103.
Show that minimum operational values of service water temperature have been used.
7.
If any of the above parameters are less conservative for your plant than used in the generic evaluation of BAW-10103, provide the sensitivity of these parameters to the overall containment pressure response.
This evaluation should demonstrate the overall conservatism of your containment j
parameters to those used in BAW-10103.
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