ML021480349

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RAI Faxed to the Licensee Susquehanna Steam Electric Station, Units 1 and 2, Elimination of Automatic High Pressure Coolant Injection Pump Suction Transfer to the Suppression Pool (TAC Nos. MB2190 & MB2191)
ML021480349
Person / Time
Site: Susquehanna  Talen Energy icon.png
Issue date: 05/28/2002
From: Eric Thomas
NRC/NRR/DLPM
To: Richard Laufer
NRC/NRR/DLPM
Thomas E, NRR/DLPM, 415-3780
References
TAC MB2190, TAC MB2191
Download: ML021480349 (3)


Text

May 28, 2002 MEMORANDUM TO: Richard J. Laufer, Chief, Section 1 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation FROM: Eric M. Thomas, Project Manager, Section 1 /RA/

Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION FAXED TO THE LICENSEE RE: SUSQUEHANNA STEAM ELECTRIC STATION, UNITS 1 AND 2, ELIMINATION OF AUTOMATIC HIGH PRESSURE COOLANT INJECTION PUMP SUCTION TRANSFER TO THE SUPPRESSION POOL (TAC NOS. MB2190 & MB2191)

Attached is a list of questions received by e-mail from the technical review staff regarding the Nuclear Regulatory Commission (NRC) staffs review of the licensees application dated June 8, 2001. The attached questions were faxed to the licensee on May 22, 2002, as a follow-up to the licensees May 7, 2002, response to the staffs request for additional information (RAI) dated December 18, 2001. This is the second set of clarifying questions that has been generated by the staff regarding the licensees RAI response. The questions were discussed during a conference call between the licensee and NRC staff on May 22, 2002. The licensees answers to these questions will allow the technical staff to move forward with its review. This memo documents the NRC staffs clarifying questions in lieu of issuing another formal RAI.

Docket Nos. 50-387 and 50-388

Attachment:

As stated CONTACT: Eric M. Thomas, NRR (301) 415-3780

MEMORANDUM TO: Richard J. Laufer, Chief, Section 1 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation FROM: Eric M. Thomas, Project Manager, Section 1 /RA/

Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION FAXED TO THE LICENSEE RE: SUSQUEHANNA STEAM ELECTRIC STATION, UNITS 1 AND 2, ELIMINATION OF AUTOMATIC HIGH PRESSURE COOLANT INJECTION PUMP SUCTION TRANSFER TO THE SUPPRESSION POOL (TAC NOS. MB2190 & MB2191)

Attached is a list of questions received by e-mail from the technical review staff regarding the Nuclear Regulatory Commission (NRC) staffs review of the licensees application dated June 8, 2001. The attached questions were faxed to the licensee on May 22, 2002, as a follow-up to the licensees May 7, 2002, response to the staffs request for additional information (RAI) dated December 18, 2001. This is the second set of clarifying questions that has been generated by the staff regarding the licensees RAI response. The questions were discussed during a conference call between the licensee and NRC staff on May 22, 2002. The licensees answers to these questions will allow the technical staff to move forward with its review. This memo documents the NRC staffs clarifying questions in lieu of issuing another formal RAI.

Docket Nos. 50-387 and 50-388

Attachment:

As stated CONTACT: Eric M. Thomas, NRR (301) 415-3780 DISTRIBUTION:

PUBLIC SRichards EThomas T. Colburn PDI-1 R/F RLaufer MOBrien Accession No.: ML021480349 OFFICE PDI-1/LA PDI-1/PM PDI-1/SC NAME MOBrien EThomas PTam for RLaufer DATE 5/23/02 5/23/02 5/28/02 OFFICIAL RECORD COPY

Background:

The following list of followup questions was generated by the reactor systems technical staff to clarify information from the licensees RAI response of May 7, 2002, and the licensees response to a list of questions faxed by the technical staff on May 16, 2002. These questions were discussed with the licensee during a conference call on May 22, 2002.

Questions:

1. Has the fuel bundle channel metal mass been considered for your stored energy calculation?
2. Please explain how the recirculation line liquid volume is added into the downcomer volume.

What are the justifications?

3. The heat discharged from the vessel wall and vessel internal metal mass is added into the decay heat as part of the fuel rod heat source. This introduces a lag for the heat transfer.

Please provide justifications and metal mass temperature history versus system Tsat in the final calculations.

4. The time to reach 25 ft in the suppression pool has been calculated for a 0.04 ft**2 break.

Why does it take a longer time than th 0.0375 ft**2 break? Please run a sensitivity case using a 0.06 ft**2 break size as well.