ML20137Z820
| ML20137Z820 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 10/02/1985 |
| From: | Heider L YANKEE ATOMIC ELECTRIC CO. |
| To: | Zwolinski J Office of Nuclear Reactor Regulation |
| References | |
| FYR-85-103, NUDOCS 8510080380 | |
| Download: ML20137Z820 (2) | |
Text
s YANKEE ATOMIC ELECTRIC COMPANY reievnone ce r 7> e 72-8100 TWX 710-380-7619 2.C.2.1 y
1671 Worcester Roact Framingharn, Massachusetts 01701 f gar i
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FYR 85-103 s /.1., K l. E,
October 2, 1985 United States Nuclear Regulatory Commission Washington, DC 20555 Attention:
Mr. John A. Zwolinski, Chief Operating Reactors Branch No. 5 Division of Licensing
References:
(a) License No. DPR-3 (Docket No. 50-29)
(b) YAEC Letter to USNRC, dated February 21, 1984 Subj ect:
Cycle 17 Operation Beyond 15,000 MWD /MTU
Dear Sir:
Figures 3.2-1, 3.2-3 and 3.2-4 contained in the Yankee Nuclear Power Station Technical Specifications show various parameters related to the peak Linear Heat Generation Rate (LHGR) and the parameters used to calculate it as a function of cycle burnup. The figures wore submitted as part of the Cycle 17 core performance analysis report, Reference (b).
The maximum core burnup shown on the figures is 15,000 MWD /MTU. However, due to the longest continuous run in our history of the plant, this cycle we expect to hit 15,000 MWD /MTU on about October 13, 1985 and reach about 15,108 MWD /MTU by our refueling shutdown on October 19, 1985. We have evaluated the consequences of this small burnup increase and have concluded the following:
a.
Fuel exposures, which are a key element in determining the peak LHGR limit, will be within the bounds of the safety analysis out to a cycle burnup of 15,200 MWD /MTU.
b.
Peaking factors, another key element in determining the peak LHGR limit, will be lower at 15,200 MWD /MTU than the peaking factors assumed in the safety analysis and at 15,000 MWD /MTU.
c.
The peak LHGR limit from Figure 3.2-1 at 15,000 MWD /MTU will be conservatively applicable to a cycle burnup of 15,200 MWD /MTU.
d.
The parameters shown on Figures 3.2-3 and 3.2-4 vary linearly with cycle burnup and, thus, can be extrapolated up to 15,200 MWD /HTU' without any loss in safety margin.
col 8510080300 851002 PDR ADOCK 05000029 e
p PDR F
N United States Nuclear Regulatory Commission October 2, 1985 Attention:
Mr. John A. Zwolinski Page 2 e.
There are no other Technical Specifications or safety analysis results that are adversely impacted by operation up to 15,200 MWD /MTU.
f.
Power level during the time period in question will be about 70% of rated thermal power.
Based on this evaluation, Yankee can continue to operate until its scheduled shutdown of October 19, 1985.
Very truly yours, xN M' L. H. Heider Vice President and Manager of Operations LHH/glw
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