ML19260D743
| ML19260D743 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 01/23/1980 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8002120096 | |
| Download: ML19260D743 (3) | |
Text
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NUCLEAR REGULATOF'.Y COMMISSION
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W ASHINGTON, D. C. 20555
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ad 50-318 Mr. A. E. Lundvall, Jr.
Vice President, Supply Baltimore Gas & Electric Company P. O. Box 1475 Baltimore, Maryland 21203
Dear Mr. Lundvall:
By letter dated April 5,1979, you made application for partial-loop operation cf the Calvert Cliffs Nuclear Power Plant Units Nos.1 and 2.
In our review of this application, we find that your response to the enclosed request for additional information in regard to the LOCA analysis is necessary to complete our review.
Please provide the requested additional information at your earliest con-venience.
Sincerely, 0
V ),/ d LI 4 < d*
Robert W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors
Enclosure:
Request for Additional Information on Partial-Loop LOCA Analysis cc w/ enclosure:
See next page 1949 025 02120 60021 soc 96
Baltinere Gas L Electric Conpany cc:
Ja es A. Biccison, Jr.
Mr. R. t'. :ouglass Manager Itneral Countel Quality Assurance Deparcnent G anc E Suilcing
. Room 923 Gas & Electri. Builcing Charles Center P. O. Box 1475 Sal tinore, Maryland 21203 Baltirore, Maryland 21203 George F. Trowbridge, Esquire Shaw, Pittnan, Potts and Troworidge 1500 M Street,l'.W.
Washington, D. C.
20036
- 1r. R. C. L. Olson Baltinore Gas and Electric Company Roon 922 - G and E Building Post Office Box 1475 Bal tinore, !iaryland 21203 fir. Leon B. Russell, Chief Enaineer Calvert Cliffs !uclear Power Plant Saltinore Gas and Electric Company Lusoy, liaryland 20657 Bechtel Power Corporation ATTt!:
lir. J. C. Juad Chief Nuclear Engineer 15740 Shady Grove Pqao Gaithersburg, Maryland 20760 censustion Engineering, Inc.
ATitt:
fir P. W. Kruse, iknager Engineering Services Post Office Box 500 Windsor, Connecticut 06095 Calvert County Library Prince Frecerick, Maryland 20678 N
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Enclosure RE0 VEST FOR ADDITIONAL INFORftATION ON THE PARTIAL-LOOP LOCA ANALYSIS FOR CALVERT CLIFFS UNITS NOS. 1 AND 2 DOCKETS NOS. 50-317 AND 50-318 1.
The analysis used a review of large break sizes to determine the limiting blowdown period. The staff assumes that this study was performed for the standard C.E. geometry. Justify that partial-loop operation will not impact the blowdown, refill and safety injection times. Also, provide the blowdown and safety injection times as a function of break size and the break size used in the present analysis.
2 2.
A constant heat transfer coefficient of 5 BTU /hr-ft - F to represent steam cooling and a rod-to-rod radiation contribution was used in this analysis.
Justify that this constant is a minimum value for this case, that is, a quasi-pool boiling and thermal radiation to steam condition at reduced power.
Also, provide the following time dependent data in plot form for the ruptured and peak clad temperature nodes:
a.
The sink temperature, Tm, for the steam cooling heat transfer.
b.
The surface heat flux due to steam cooling.
c.
The surface heat flux due to rod-to-rod radiation.
3.
Provide the following additional information:
a.
the hot pin axial power profile b.
the power decay curve in tabular foho c.
the time varying inlet core reflood rate in plot form d.
the time varying core outlet mass flow in plot form e.
and, the time varying core mixture level in plot form.
1949 027