ML20198F834
| ML20198F834 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 12/30/1997 |
| From: | Buckley B NRC (Affiliation Not Assigned) |
| To: | Hunger G PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| References | |
| TAC-M99856, TAC-M99857, NUDOCS 9801120184 | |
| Download: ML20198F834 (4) | |
Text
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December-30, 1997
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. Mr. George A. Hunger, Jr.
Director-Licensing, MC 62A-1 PECO Energy Company Nuclear Group Headquarters Correspondence Control Desk P. O. Box No. 195 Wayne, PA 19087-0195
SUBJECT:
U MERICK GENERATING STATION, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING EMERGENCY CORE C001,ING SYSTEM (ECCS) PUMP SUCTION STRAINEfi MODIFICATION (T?C NOS. M99856 AND M99857)
Dear Mr. Hunger:
By letter dated October 6, 1997, PECO Energy Company requested NRC review and approval of the implementation of a plant modification to support the installation of replacement suction strainers for the ECCS pumps at the Limerick Generating Station (LGS), Units 1 and 2.
Based on our review of your submittal, we find that additional information, as delineated in the Enclosure, is required in order to continue our review.
We request a prompt response to support your request to complete installation of the strainers at LGS, Unit I during the April 1998 refueling outage.
Sincerely,
/s/
Bartholomew C. Buckley, Senior Project Manager Project Directorate I-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket Nos.53-352 and 50-353
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December 30, 1997 Mr. George A. Hunger, Jr.
Director-Licensing, MC 62A-1 PECO Energy Company Nuclear Group Headquarters Correspondence Control Desk P. O. Box No. 195 Wayne, PA 19087-0195
SUBJECT:
LIMERfCK GENERATING STATION, UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING EMERGENCY CORE COOLING SYSTEM (ECCS PUMP SUCTION STRAIMER MODIFICATION (TAC NOS. M99856 AND M99857
Dear Mr. Hunger:
By letter dated October 6,1997, PECO Energy Company requested NRC review and approval of the implementation of a plant modification to support the installation of replacement suction strainers for the ECCS pumps at the Limerick fienerating Station (LGS), Units I and 2.
Based on our review of your submittal, we find that additional information, as delineated in the Enclosure, is required in order to continue our review.
We requert a prompt response to support your request tc complete installation of the strainers at LGS, Unit I during the April 1998 refueling outage.
Sincerely, s
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Bartholomew C. Buckley, Senior Proje knager Project Directorate I-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Reguiation Docket Nos. 50-352 and 50-353 l
Enclosure:
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Mr. George A. Hunger, Jr.
Limerick Generating Station, PECO Energy Company Units 1 & 2 l
cci J. W. Durham, Sr., Esquire Chief-Division of Nuclear Safety Sr. V.P. & General Counsel PA Dest. of Environmental Resources PECO Energy Company P.O.
k)x 8469 2301 Market Street Harrisburg, PA 17105-8469 Philadelphia, PA 19101 Manager-Limerick Licensing, 62A-1 Director-Site Engineering PECO Energy Con)any Limerick Gen 9 rat <ng Station 965 Chesterbroot Boulevard P.O. Box A Wayne, PA 19087-5691 Sanatoga, PA 19464 Mr. Walter G. MacFarland, Vice President Limerick Generating Station Manager-Experience Assessment Post Office Box A Limerick Generating Station Sanatoga, PA 19464 P.O. Box A Sanatoga, PA 19464 Plant Manager Limerick Generating Station Library P.O. Box A U.S. Nuclear Regulatory Commi:sion Sanatoga, PA 19464 Region 1 475 Allendale Road Regional Administrator, Wegion I King of Prussia, PA 19406 U.S. Nuclear Regulatory Commission 475 Allendale Road Senior Manager-Operatior.s King of Prussia, PA 19406 Limerick Generating Station P.O. Box A Senior Resident Inspector Sanatoga, PA 19464 U.S. Nuclear Regulatory Commission Limerick Generating Station Dr. Judith Johnsrud P.O. Box 596 National Energy Committee Pottstown, PA 19464 Sierra Club 433 Orlando Avenue Director-Site Support Services State College, PA 16803 Limerick Generating Station P.O. Box A Sanatoga, PA 19464 Chairman Board of Supervisors of Limerick Township 646 West Ridge Pike Linfield, PA 19468 l
x A-e Limerick Generating station, Units 1 and 2, Request for Additional Informacion By letter dated October 6.-1997, PEC0 Nuclear requested NRC review and approval of the -implementation of a plant modification to support installation I
of replacement suction strainers for the Emergency Core Cooling System (ECCS) j pus.ps at-Limerick Generating Station, Units 1-and 2.
PEC0 Nuc1 car has concluded that the proposed modification is a Unreviewed Safety Question
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(USQ). The USQ that was identified pertains to the design assumptions used for dete,nining the amount of debris that would be expected to be generated under Loss of Coolant Accident conditions and the amount of u terial that would be transported to the suppression pool. The Reactor Systems Branch (SRXB) has reviewed PEC0 Nuclear's request and has developed the following request for additional information (RAI).
- 1. of the October 6,1997, submittal states that 'the margin of safety for the ECCS system is defined by the flow rates produced by-the pumps.
If tha required NPSH is maintained, the ECCS pumps will deliver the rata # fl w.
The replacement suction strainers are designed to maintain the pnwure drop across a fully fouled strainer to 2 feet less-than the available NPSH margin for the RHR and Core Spray pumps under design basis LOCA conditions with the maximum combined insulation and corrosion product debris loading." This statement implies that the
.new strainers will reduce the available NPSH margin by 2 feet.
Provide
- a copy of the NPSH analyses for the RHR and Core Spray pumps with the new ECCS strainer design.
2.
The staff is aware that the Limerick ECCS is designed to meet the guidance specified in Safety Guide 1, " Net Positive Suction Head for Emergency Core Cooling and Containmer.t Heat Removal System Pumps,"
Revision 0, and that Limerick Generating Station intends to continue to meet the guidance of Safety Guide 1.
The staff also needs to know if L
there are or will be any other modifications to the NPSH analyses, h
besides the strainer debris loading head loss, that are different from the last previously approved NPSH analyses.
Provide a description of all differences between the NPSH analyses with the new ECCS strainers and the previously-reviewed and approved NPSH analyses.
l ENCLOSURE
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