ML19309D386
| ML19309D386 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 02/29/1980 |
| From: | Ziemann D Office of Nuclear Reactor Regulation |
| To: | Linder F DAIRYLAND POWER COOPERATIVE |
| References | |
| NUDOCS 8004100314 | |
| Download: ML19309D386 (3) | |
Text
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p# #80vj UNITED STATES 8
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',7, NUCLEAR REGULATORY COMMISSION I
wAseiwoToN o.c.2osas February 29, 1980 e(.....,/
Docket No. 50-409 Mr. Frank Linder General Manager Dairyland Power Cooperative 2615 East Avenue South La Crosse, Wisconsin 54601
Dear Mr. Linder:
During the last several years, data have begun to indicate that the fission gas release rate from LWR fuel pellets is increased (enhanced) with burnup.
Many of the current fuel performance analyses do not consider the impact of By letters dated November 23, 1976, the burnup-enhanced release on safety.
NRC staff requested all LWR licensees to assess the higher fission gas release for fuel burnups above 20,000 Megawatt-day per metric ton (MWD /t).
18, 1978, all U. S. LWR fuel suppliers Also, by NRC staff letter dated January were requested to revise their fuel performance analyses to include the enhance-ment of fission gas release at higher burnups.
23, 1976 letters have been reviewed.
We have All responses to the November concluded that no immediate licensing action is required for operating reactors.
This conclusion is valid for typical reported LWR fuel bundle and batch burn-Any extension of these burnups or other factors which significantly affect ups.
fission gas release, LOCA PCT or fuel rod internal pressure is outside the scope of the conclusion.
The effect of enhanced release on BWR ECCS performance has been discussed with GE has pointed out that because of operational restric-General Electric (GE).
tions and physical limitations, the LOCA analysis is not limiting in high burn-High burnup fuel generally cannot achieve linear power up fuel (s25,000 MWD /t).
Typically, densities near the LOCA limit for a typical BWR operating conditions.
The limiting fuel bundle is usually in BWRs are LOCA limited early in cycle.
its second cycle of reactor operations where burnup levels are below =20,000 Late in a BWR fuel cycle, there is less axial power peaking reducing MWD /t.
the feasibility for any given axial location to exceed LOCA linear power density limits, and the fuel bundle power is generally limited by MCPR considerations.
Thus, it is unlikely that a high burnup bundle can exceed the ECCS performance l
criteria in case of a LOCA. The argument is appropriate for all La Crosse Therefore, fuel bundle designs also based on the review of appropriate analyses.
no immediate licensing action is necessary on operating BWRs.
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Mr. Frank Linder 2
February 29, 1980 Inasnuch as you and/or the staff will be evaluating all future reloads against fuel vendors' revised fuel performance codes which provide for increase in fission gas release at higher burnups, we consider this a satisfactory resolution of this concern.
Sincerely,
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%,L n i,,3 Dennis L. Ziemann, hief Operating Reactors Branch #2 Division of Operating Reactors cc:
See next page O
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Mr. Frank Linder February 29, 1980 CC Director, Technical Assessment Fritz Schubert. Esquire Divi sion Staff Attorney Office of Radiation Prcgrams Dairyland Power Cooperative (AW-459) 2615 East Avenue South U. S. Environmental Protection La Crosse, Wisconsin 54601 Agency O. S. Heistand, J r., Esquire Crystal Mall #2 Morgan, Lewis & Bockius Arlington, Virginia 20460 1800 M Street, N. W.
U. S. Environmental Protection Washington, D. C.
20036 Agency Federal Activities Branch Mr. R. E. Shimshak La Crosse Boiling Water Reactor Region V Office ATTN:
EIS COORDINATOR Dairyland Power Cooperative 230 South Dearborn Street P. O. Box 135
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Genoa, Wisconsin 54632 Chicago, Illinois 60604 Charles Bechhoefer, Esq., Chairman Coulee Region Energy Coalition Atomi,c Safety and Licensing Board ATTN: George R. Nygaard U."S. Nuclear Regulatory Comission
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P. O. Box 1583 La Crosse, Wisconsin 54601
_ Washington, D. C.
20555 t
La Crosse Public Library Dr. George C. Anderson Department of Oceanography 800 Main Street La Crosse, Wisconsin 54601 University of Wamkgton Seattle, Washington' 98195 Mrs. Ellen Sabelko Society Against Nuclear Energy Mr. Ralph S. Decker Route 4, Box 190D 929 Cameron Trail Eau Claire, Wisconsin 54701 Cambridge, Maryland 21613 Dr. Lawrence R. Quarles Town Chairman Kendal at Longwood, Apt. 51 Town of Genoa Kenneth Square, Pennsylvania 1934B Route 1 Genoa, Wisconsin 54632 Chairman, Public Service Comission Thomas S. Moore, Esq.
Atomic Safety and Licensing Appeal Board of Wisconsin Hill Farms State Office Building U. 5. Nuclear Regulatory Comission Madison, Wisconsin 53702 Washington, D. C.
20555 Alan S.'Rosenthal,Esq., Chairman Atomic Safety and Licensing Appeal Board U. S. Nuclear Regulatory Comission Washington, D. C.
20555 i
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