ML20070F106
| ML20070F106 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 12/06/1982 |
| From: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8212200088 | |
| Download: ML20070F106 (3) | |
Text
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BALTIM O RE GAS AND ELECTRIC CHARLES CENTER P.O. BOX 1475 BALTIMORE, MARYLAND 21203 ARTHUR E. LUNDVALL, JR.
Vict PREssoENT December 6,1982 Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 ATTENTION: Mr. R. A. Clark, Chief Operating Reactors Branch #3 Division of Licensing
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit 2, Docket No. 50-318, DPR-69 Response to NRC Questions on Cycle 5 License Application
REFERENCE:
(A)
A. E. Lundvall to R. A. Clark ltr. dated 10/15/82
" Amendment to Operating License DPR-69 Fifth Cycle License Application."
Gentlemen:
NRC Staff posed several questions on Reference (A). Responses are attached.
Should you have any questions, please contact us.
Very truly yours, BALTIMORE GAS AND ELEC.TRIC COMPANY
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D. H. Jaffe - NRC P. W. Kruse - CE R. E. Architzel-NRC 8212200008 821206 q
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Nuclear Regulatory Commission December 3,1982 ATTACHMENT Question 1 Provide the design inlet temperature, average core temperature rise and peak linear heat rate on KW/ft for both the reference cycle and Cycle 5.
Response
The core design inlet temperature is 548 F for both the reference cycle (Unit 1 Cycle 6) and Unit 2 Cycle 5. The hot full power design average core temperature rise is 49.0 F for both cycles, based upon a nominal core average flow of 381,600 GPM. The design peak linear heat rates are 11.7 KW/ft and 12.0 KW/ft, respectively, for the reference cycle and Unit 2 Cycle 5. The Tech Spec LCO on peak linear heat rate is 15.5 KW/ft for both the reference cycle and Unit 2 Cycle 5.
Question 2 Provide the actual reactor coolant flow rate in GPM and Ib/hr from the mast recent measurement and also for the reference cycle.
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Response
Most Recent Measurement (Unit 2, Cycle 4) 411,600 GgM 155.5 x 10 lbm/hr Reference Cycle Measurement (Unit 1, Cycle 6) 403,700 GgM 152.2 x 10 lbm/hr guestion 3 With regard to fuel rod bowing, provide a table showing the bundle average burnup versus DNBR penalty in percent.
Answer A table, showing the DNBR penalty versus bundle average burnup for bundles with burnups greater than the NRC specified DNBR penalty threshold burnup of 24 GWD/T, follows.
These penalty factors were determined via an interpolation of the data contained in the reference.
i Nuclear Regulatory Commission December 3,1982 l
Table DNBR Penalty Versus Bundle Average Burnup Bundle Average B/U DNBR Penalty
- GWD/T 24.0 0.00 25.8 0.60 30.5 2.20 34.8 3.60 35.2 3.75
" Note:
As discussed in the License Submittal, no power penalty for fuel rod bowing is required in the Unit 2 Cycle 5 analysis. Such a penalty does not need to be assessed because the difference between 1-pin peaking values for assemblies that exceed 24 GWD/T and more limiting peak values present in other less burned assemblies is considerably in excess of the DNBR rod bow penalty.
Reference Letter, D. F. Ross and D. G. Eisenhut (NRC) to D. B. Vassallo and K. R. Goller (NRC),
" Revised Interim Safety Evaluation Report on the Effects of Fuel Rod Bowing in Thermal Margin Calcuation for Light Water Reactors," February 16,1977.
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