ML20197B646
| ML20197B646 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 10/27/1986 |
| From: | Mihalcik J BALTIMORE GAS & ELECTRIC CO. |
| To: | Thadani A Office of Nuclear Reactor Regulation |
| References | |
| FCM-86-256, NUDOCS 8610300364 | |
| Download: ML20197B646 (2) | |
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O BALTIMORE OAS AND ELECTRIC CHARLES CENTER. P.O. BOX 1475 BALTIMORE, MARYLAND 21203 NUCLEAR ENGINEERING SERVICES DEPARTMENT CALVERT CLrFS NUCLEAR POWER PLANT LU$8Y, MARYLAND 20657 October 27,1986 FCM 86-256 Mr. Ashok C. Thadani, Director PWR Project Directorate #8 Division of PWR Licensing-B U.S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Washington, D.C. 20555
SUBJECT:
Moderator Temperature Coefficients for Unit 1 Cycle 9 and Unit 2 Cycle 8
REFERENCE:
(A) 3.A. Tiernan to A.C. Thadani letter dated July 31,1986, "Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 &
50-318; Request for Amendment", six changes including Moderator Temperature Coefficient (B) BG&E/C-E Presentation to NRR on 24-Month Cycles at Bethesda, October 1,1986 Mr. Thadani:
In Reference (A), BG&E requested a modification to Technical Specification 3.1.1.4 concerning moderator temperature coefficient (MTC). Prior to this submittal all safety analyses with the exception of Feed Line Break addressed positive temperature coefficients at least as high as +.5.
With this submittal, the most limiting Feed Line Break was evaluated to show that a +.5 MTC is acceptable at 100% power.
This submittal requested changing the 100% limit to +.5.
At our meeting (Reference (B)) some concern was expressed about positive MTC effect on the generic ATWS assumptions. Prior to Unit 1 Cycle 10 in the spring of 1988, we plan to address the generic ATWS implications, if any. Until then, BG&E will operate under the following MTC restrictions:
o Unit 1 Cycle 9 MTC will be negative at 100% power and equilibrium xenon conditions.
8610300364 861027 PDR ADOCK 05000317 i 0 P
PDR 1
E October 27,1986
,w FCM 86-256 Page 2 Unit 2 Cycle 8 MTC will be negative at 100% power and equilibrium xenon o
conditions. Unit 2 Cycle 7 shutdown burnup in excess of the lower design window ensures a negative MTC for current Unit 2 Cycle 8 core design.
M L
{.j. Mihalcik A
Fuel Cycle Management 3AM/Imt cc:
D. A. Brune, Esquire
- 3. E. Silburg, Esquire S. A. McNeil, NRC T. Foley, NRC