ML021080289
| ML021080289 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/30/2002 |
| From: | Colburn T NRC/NRR/DLPM/LPD1 |
| To: | Skolds J Exelon Nuclear |
| Colburn T, NRR/DLPM, 415-1402 | |
| References | |
| TAC MB3163 | |
| Download: ML021080289 (5) | |
Text
April 30, 2002 Mr. John L. Skolds, President and Chief Nuclear Officer Exelon Nuclear Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
THREE MILE ISLAND NUCLEAR STATION, UNIT 1 (TMI-1) RE: PEAK ROD AVERAGE POWER (TAC NO. MB3163)
Dear Mr. Skolds:
By letter dated August 22, 2001, you responded to a request for additional information (RAI) related to your January 23, 2001, License Amendment Request No. 249 for TMI-1. In that letter you identified that for a few fuel assemblies, the peak rod average power would exceed the guideline of 6.3 kw/ft (kilowatts per foot) specified in Regulatory Guide (RG) 1.183, Section 3.2, Table 3, footnote 11, for a few days at the end of TMI-1 Operating Cycles 13 and 14. You also indicated that you had performed a bounding assessment of the affect of this condition and concluded that the calculated doses remained well within the limit specified in RG 1.183 and Title 10 of the Code of Federal Regulations (10 CFR), Section 50.67. The Nuclear Regulatory Commission (NRC) staff performed a confirmatory assessment of the affect of this condition and requested by letter dated December 12, 2001, that you provide gap release fractions for fuel assemblies exceeding 54 GWD/MTU (gigawatt days per metric ton uranium) burnup and 6.3 kw/ft linear heat generation rate using the American National Standards Institute (ANSI)/ANS Standard 5.4, Methods for Calculating the Fractional Release of Volatile Fission Products From Oxide Fuel.
You responded to the NRC RAI by letter dated February 15, 2002. You recalculated the fission product release fractions using the methodology described in ANSI/ANS 5.4 assuming a peak rod average power of 8.0 kw/ft which bounds the worst case Cycle 13 and 14 fuel assembly peak rod average power of 7.1 kw/ft. You also conservatively assumed that the high power fuel rods would operate at burnups in excess of 54 GWD/MTU for 60 days achieving burnups of 57 GWD/MTU.
The NRC staff has determined that your assumptions for peak rod average power and maximum burnup are conservative and therefore, acceptable. Further, the NRC staff has reviewed the gap release fraction recalculated by your staff and determined that you have demonstrated that the assumption previously made in the bounding assessment to double the release fractions for high burnup was more conservative relative to the recalculation performed using the ANSI/ANS 5.4 methodology. Therefore, the NRC staff concludes that there is reasonable assurance that the radiological dose calculation supporting License Amendment Request No. 249, wherein you assumed a doubling of the fission product release fractions, still bounds the radiological consequences of a postulated design-basis fuel handling accident. The
J. Skolds NRC staff further concludes that the gap release fractions used to support the January 23, 2001, License Amendment Request No. 249 remain acceptable.
Sincerely,
/RA/
Timothy G. Colburn, Senior Project Manager, Section 1 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-289 cc: See next page
J. Skolds NRC staff further concludes that the gap release fractions used to support the January 23, 2001, License Amendment Request No. 249 remain acceptable.
Sincerely,
/RA/
Timothy G. Colburn, Senior Project Manager, Section 1 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-289 cc: See next page DISTRIBUTION PUBLIC ACRS OGC JLee PDI-1 Reading BPlatchek, RI RLaufer MReinhart MOBrien SRichards TColburn ACCESSION NO.: ML021080289
- SE received. No substantive changes made OFFICE PDI-1\\PM PDI-2\\LA PSAB\\SC PDI-1\\SC NAME TColburn MOBrien MReinhart*
RLaufer DATE 4/25/02 4/25/02 03/14/02 4/30/02 OFFICIAL RECORD COPY
Three Mile Island Nuclear Station, Unit No. 1 cc:
Site Vice President - Three Mile Island Nuclear Station Unit 1 AmerGen Energy Company, LLC P. O. Box 480 Middletown, PA 17057 Senior Vice President Nuclear Services Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Vice President - Mid-Atlantic Operations Support Exelon Generation Company, LLC 200 Exelon Way, KSA 3-N Kennett Square, PA 19348 Senior Vice President -
Mid Atlantic Regional Operating Group Exelon Generation Company, LLC 200 Exelon Way, KSA 3-N Kennett Square, PA 19348 Vice President -
Licensing and Regulatory Affairs Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Regional Administrator Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Chairman Board of County Commissioners of Dauphin County Dauphin County Courthouse Harrisburg, PA 17120 Chairman Board of Supervisors of Londonderry Township R.D. #1, Geyers Church Road Middletown, PA 17057 Senior Resident Inspector (TMI-1)
U.S. Nuclear Regulatory Commission P.O. Box 219 Middletown, PA 17057 Director - Licensing - MId-Atlantic Regional Operating Group Exelon Generation Company, LLC Nuclear Group Headquarters Correspondence Control P.O. Box 160 Kennett Square, PA 19348 David J. Allard, Director Bureau of Radiation Protection Pennsylvania Department of Environmental Protection P.O. Box 8469 Harrisburg, PA 17105 Three Mile Island Nuclear Station Unit 1 Plant Manager AmerGen Energy Company, LLC P. O. Box 480 Middletown, PA 17057 Regulatory Assurance Manager - Three Mile Island Unit 1 AmerGen Energy Company, LLC P.O. Box 480 Middletown, PA 17057 John F. Rogge, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Michael A. Schoppman Framatome ANP Suite 705 1911 North Ft. Myer Drive Rosslyn, VA 22209
Three Mile Island Nuclear Station, Unit No. 1 cc: continued Vice President, General Counsel and Secretary Exelon Generation Company, LLC 300 Exelon Way Kennett Square, PA 19348 Dr. Judith Johnsrud National Energy Committee Sierra Club 433 Orlando Avenue State College, PA 16803 Eric Epstein TMI Alert 4100 Hillsdale Road Harrisburg, PA 17112 Correspondence Control Desk Exelon Generation Company, LLC 200 Exelon Way, KSA 1-N-1 Kennett Square, PA 19348 Manager Licensing - Oyster Creek and Three Mile Island Exelon Generation Company, LLC Nuclear Group Headquarters Correspondence Control P.O. Box 160 Kennett Square, PA 19348