ML19276H280
| ML19276H280 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/07/1975 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Stello V Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7910160625 | |
| Download: ML19276H280 (3) | |
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AUS 7 E75 Docket No. 50-299 V. Stello, Assistant Director for Reactor Safety, TR REQUZST FOR ADDITIONAL I:ECEIATICN - THREE MILE ISI.AND, Ci!T 1 Plant Na::m:
Three Mile Island, Unit 1 Docket No. :
50-289 Licensing Stage:
Babcock & Wilcox Contain wnt Type: Dry Architect Engineer:
GiFaert Responsible Branch & Project Manager:
RSB; G. Masetis Esquested Cc::2pletion Date: October 1, 1975 Review Status:
Incomplete The Containment Systems Branch is reviewing the containment pressure calculations used for the ECCS evaluation of Three Mile Island, Unit 1 dated July 9, 1975. The applicant references Topical Report "ECCS Evaluation of B&W's 177-FA Lowered Loop NSS" BAW-10103, for its ECCS evaluation.
The containment input parameters selected for use in BAW-10103 have not been sufficiently justified as being conservative for the ECCS containmant pressure calculation of Three Mile Island, Unit 1.
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 Three Mile Island, Unit 1 is enclosed.
Or!&a! ! geed by:
Robert L Tedeseo Robert L. Tedesco, Assistant Director for Containment Safety Divisien of Technical Review
Enclosure:
As stated ec: S. Hanauer G. Lainas NRR Reading R. Heinman L. Engle CS Reading A. Giambusso S. Varga CSB Reading W. Mcdonald J. Kudrick hcketFile 1419 270 D. Eisenhet J. Shapaker G. Masetis W. Jensen g
T. Novak J. Glynn 7910160 e
A. Schwancer C. Anderson G. Lear I
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7 REQUEST FOR ADDITIONAL INFORMATION THREE MILE ISLAND, UNIT 1 DOCKET NO. 50-289 The ECCS analysis for your plant is referenced to BAR-10103.
Provide justification for the following input parameters used in BAW-10103 by compari-son 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 equipment and their volumes which are subtracted to obtain the net free contain=ent volume. A discussion of the uncertainties should be provided.
2.
Passive Heat Sinks - Provide the actual passive heat sink structures for your plant.
Discuss the method of determining the passive containment heat sinks.
Identify each heat sink by category (i.e., cable tray, equip-ment supports, floor grating, crane wall, etc.) and provide surf ace arca, 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 f actors 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 Soray Water Temperature - Show that the value of containment spray water temperature used in the containment response analysis is the lower bound temperature consistent with plant operating conditions and that the spray flow rate used is suitably conservative.
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Fan-Cooler Heat Removal Rate - Compare the maximum fan-cooler heat r emoval rate for Three Mile Island, Uni.t 1 with that assumed in BAR-10103.Show that minimum operational values. of service water te=perature have b een 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 sen iti i s
v ty of these parameters to the overall containment pressure response This evaluation should demonstrate the overall conservatism of your containmen parameters to those used in BAW-10103.
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