ML19309A677
| ML19309A677 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 01/22/1974 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| 779, NUDOCS 8003310650 | |
| Download: ML19309A677 (2) | |
Text
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AEC DISTR' 9 TION FOR PART 50 DOCKET MATERII";
(TDiPORARY FORM)
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CONTROL NO:
779 j
FILE:
FROM:
DATE OF DOC DATE REC'D LTR MEMO RPT OTHER Srcramento Municipal Utility District Srcramento, California 95813 J. J. Mattimoe 1-22-74 1-29-74 X
TO:
SENT LOCAL PDR X
Mr. Clamhuman 1 e f em o A CLASS UNCLASS PROP INFO INPITT NO CYS REC'D DOCKET NO:
XXXX 1
50-312 ENCLOSURES:
DESCRIPTION:
Ltr lurnishing info regarding a change that B:bcock & Wilcox is making in the specific hast curve for UO fuel as utilized in some oftheirtransienfcomputercodes........
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$SMUD SACRAMENTO MUNICIPAL UTILITY DISTRICT O 6201 S Street, Box 15830, Sacramento, Califomia 95813; (916) 452-3211 January 22, 1974 191i Mr. Angelo Giambusso fl Deputy Director for Reactor Projects
'Enl h h M29 gg [h, Directorat.e of Licensing U. S. Atomic Energy Commission 33, Washington, D. C.
20545 lasmiq l/
AEC Docket No. 50-312 j
Rancho Seco Nuclear Generating g
Station, Unit No. 1
Dear Mr. Giambusso:
Babcock & Wilcox has notified us of a change they are making in the specific heat curve for UO2 fuel as utilized in some of their transient computer codes. This change will be reflected in a higher value of the specific heat for elevated fuel temperatures.
The studies necessary to quantify the impact that this revision may have on the safety analyses reported in the SAR are under way. The general effect will be a change in the level of stored energy in the fuel as well as in the time response of some transients.
Based on B&W's present evaluation, this revision will not affect the steady-state analysis because the basic data from which the curve is derived are valid; it is these basic data that are used for the steady-state calculations. The particular effect on kinetic behavior can be determined only by an evaluation of the safety analyses. To indicate the magnitude of this revision, preliminary calculations on Oconee No. 2 show that a reduction in the maximum linear heat rate of less than 1.0 kW/ft. should offset the effects of this change in specific heat.
We will keep you advised on the status of B&W's continuing j
investigation. We understand that B&W will be discussing this information with you on a generic basis in an effort to keep you fully informed of further developments.
, <- > w Sincerely yours,
[
J. J. Mattimoe
!j a nd,, g g F IS Assistant General Manager and Chief Engineer grW/M i s
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