ML19312C120
| ML19312C120 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 01/25/1974 |
| From: | Thies A DUKE POWER CO. |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 7912040546 | |
| Download: ML19312C120 (2) | |
Text
Qi~y W4 ' T 4
s DUKE POWER COMPANY
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Powna Burz.orwo l
422 SouTu Cnuncu STazzT, CuAntoTTE, N. C. asaos b
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January 25, 1974 gg, r_
JAN 311974 > '
W'l REGULATCRY VAIL SEcnon S
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to / co Mr. Angelo Giambusso Deputy Director for Reactor Projects JAN 31374 '
Directorate of Licensing U. S. Atomic Energy Commission
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- " 4D Washington, D. C.
20545 N
Re:
Oconee Nucla~ M ~4on DocketNos.O-26d-270,and-287
Dear Mr. Giambusso:
The Babcock & Wilcox Company has notified us of a change in the calculation of the specific heat curve for uranium dioxide fuel as utilized in some of their transient computer codes. This change j
will be reflected in a higher n lue of the specific heat for elevated fuel temperatures.
The studies necessary to quantify the impact of this change on the safety analyses reported in the Final Safety Analysis Report have been initiated. The general effect of the change will be in the level of stored energy in the fuel as well as in the response time 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 particulcr 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 2 show that a reduction in the maximum linear heat rate of less than 1.0 kw/ft should offset the effects of this revision in specific heat.
My letter of December 31, 1973 requested certain changes to the Units 1 and 2 Technical Specifications.
In view of the above, it appears that Figures 3.5.2-131, 3.5.2-1B2, 3.5.2-2B, 3.5.2-3B, and 3.5.2-4 may need to be revised.
It is expected that we can provide you with revised figures and additional justification in approximately two weeks.
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Mr. Angelo Giambusso Page 2 January 29, 1974 We will keep you advised on the status of B&W's continuing investigation and understand that B&W will be providing you additional information on a generic basis.
Very truly yours, f
A. C. Thies ACT:vr i
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