ML17158C065
| ML17158C065 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 04/09/1997 |
| From: | Poslusny C NRC (Affiliation Not Assigned) |
| To: | Byram R PENNSYLVANIA POWER & LIGHT CO. |
| References | |
| TAC-M97499, NUDOCS 9704140243 | |
| Download: ML17158C065 (5) | |
Text
April.9, '1997
-i,Mr. Robert G.
Byram Senior Vice President-Nuclear Pennsylvania Power and Light Company 2 North Ninth Street Allentown, PA 18101
SUBJECT:
. REQUEST FOR ADDITIONAL INFORMATION (RAI) ON REVISION TO LICENSE AMENDMENT REQUEST FOR MINIMUM CRITICAL POWER RATIO SAFETY LIMITS FOR SUSQUEHANNA STEAM ELECTRIC STATION, UNIT 2 (TAC NO. H97499)
Dear Mr. Byram:
By letter dated December 18,
- 1996, as supplemented by the letters dated March 12 and 27,
- 1997, Pennsylvania Power
& Light Company made application to amend the Technical Specifications (TSs) for the Susquehanna Steam Electric Station, Unit 2, Cycle 9, to permit the use of ATRIUM-10 fuel in the Susquehanna Steam Electric Station, Unit 2.
The Reactor Systems Branch has reviewed the licensee's amendment requests and prepared the enclosed RAI.
Please provide a prompt response to this set of questions to support the, staff's review schedule.
If you have any questions concerning this RAI please contact me on (301) 415-1402.
Sincerely,
/s/
Docket No. 50-388
Enclosure:
RAI cc w/encl:
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 April 9, 1997 Hr. Robert G.
Byram Senior Vice President-Nuclear Pennsylvania Power and Light Company 2 North Ninth Street Allentown, PA 18101
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION (RAI) ON REVISION TO LICENSE AMENDMENT REQUEST FOR MINIMUM CRITICAL POWER RATIO SAFETY LIMITS FOR SUSQUEHANNA STEAM ELECTRIC STATION, UNIT 2 (TAC NO. H97499)
Dear Mr. Byram:
By letter dated December 18,
- 1996, as supplemented by the letters dated March 12 and 27,
- 1997, Pennsylvania Power 5 Light Company made application to amend the Technical Specifications (TSs) for the Susquehanna Steam Electric Station, Unit '2, Cycle 9, to permit the use of ATRIUM-10 fuel in the Susquehanna Steam Electric Station, Unit 2.
The Reactor Systems Branch has reviewed the licensee's amendment requests and prepared the enclosed RAI.
Please provide a prompt response to this set of questions to support the staff's review schedule.
If you have any questions concerning this RAI please contact me on (301) 415-1402.
Sincerely, I
Docket No. 50-388 Encl,osure:
RAI cc: w/encl:
See next page Chester
- Poslusny, S nior Project Manager Project Directorate I-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation
Hr. Robert G.
Byram Pennsylvania Power
& Light Company sj'usquehanna Steam Electric Station, Units 1
& 2 CC!
Jay Silberg, Esq.
- Shaw, Pittman, Potts
& Trowbridge 2300 N Street N.W.
Washington, D.C.
20037 Bryan A. Snapp, Esq.
Assistant Corporate Counsel Pennsylvania Power
& Light Company 2 North Ninth Street Allentown, Pennsylvania 18101 Hr. J.
H. Kenny Licensing Group Superviso'r Pennsylvania Power
& Light Company 2 North Ninth Street Allentown, Pennsylvania 18101 Hr. K. Jenison Senior Resident Inspector U.
S. Nuclear Regulatory Commission P.O.
Box 35 Berwick, Pennsylvania 18603-0035 Hr. William P. Dornsife, Director Bureau of Radiation Protection Pennsylvania Department of Environmental Resources P.
O.
Box 8469 Harrisburg, Pennsylvania 17105-8469 Mr. Jesse C. Tilton, III Allegheny Elec. Cooperative, Inc.
212 Locust Street P.O.
Box 1266 Harrisburg, Pennsylvania 17108-1266 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, Pennsylvania 19406 Mr. George Kuczynski Plant Manager Susquehanna Steam Electric Station Pennsylvania Power and Light Company Box 467 Berwick, Pennsylvania 18603 Mr, Herbert D. Woodeshick Special Office of the President Pennsylvania Power and Light Company Rural Route 1,
Box 1797 Berwick, Pennsylvania 18603 George T. Jones Vice President-Nuclear Operations Pennsylvania Power and Light Company 2 North Ninth Street Allentown, Pennsylvania 18101 Dr. Judith Johnsrud National Energy Committee Sierra Club 433 Orlando Avenue State College, PA 16803 Chairman Board of Supervisors 738 East Third Street
- Berwick, PA 18603
RE UEST FOR ADDITIONAL INFORMATION REGARDING REVISION TO LICENSE AMENDMENT RE UEST FOR MINIMUM CRITICAL POWER RATIO SAFETY LIMITS SUS UEHANNA STEAM ELECTRIC STATION UNIT '2 DOCKET NO. 50-388 The following questions concerning the safety limit minimum critical power ratio (SLHCPR) analysis and its Cycle 9 implementation at Susquehanna Unit 2 are raised as a result of our review of the proposed methodology in letters dated March 12, 1997 and March 27, 1997.
1.
In the standard SLHCPR analysis, the SLHCPR is calculated for a large set of statepoints throughout the burnup cycle and the maximum value is selected for determining the operating limit HCPR.
The proposed Susquehanna Unit 2 Cycle 9 operating limit is based on an evaluation of a relatively small set (of approximately
- 5) of operating statepoints, rather than an evaluation of the complete set of cycle-statepoints.
Provide a quantitative estimate of the effect of this simplification.
2.
The PP&L methodology for determining the flow-correction to the AOO ~CPR employs a "more conservative off-li,ne approach."
Describe this method in detail and how it ensures a conservative flow-corrected
~CPR.
3.
What uncertainty allowance was included for the additive constants at low flow in the Susquehanna Unit 2 Cycle 9 Technical Specification HCPR safety limit calculations (Figures
- 2. 1.2-1 and 3.4. 1. 1.2-1)7 Was an uncertainty allowance of 0.031 used?
4.
The increased additive constant uncertainty at low flows is to account for the lack of data below 0.05 Hlb/hr.
However, the PPEL response (Page 3 of
- 16) appears to indicate that this increased uncertainty was only applied for flows between 0.02 and 0.025 Mlb/hr.
What is the effect on the SLMCPR. of applying the incr eased additive constant uncertainty (of 0.031) to flows below 0.05 Hlb/hr7