ML040780982

RAI, Main Steam Tunnel Temperature

ML040780982
Person / Time
Site:	Peach Bottom
Issue date:	03/22/2004
From:	George Wunder NRC/NRR/DLPM/LPD1
To:	Crane C Exelon Generation Co, Exelon Nuclear
Wunder G, NRR/DLPM, 415-1494
References
TAC MC2018
Download: ML040780982 (6)

Text

March 22, 2004 Mr. Christopher M. Crane, President and Chief Nuclear Officer Exelon Nuclear Exelon Generation Company, LLC 200 Exelon Way, KSA 3-E Kennett Square, PA 19348

SUBJECT:

PEACH BOTTOM ATOMIC POWER STATION, UNIT 2 - REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING MAIN STEAM TUNNEL TEMPERATURE (TAC NO. MC2018)

Dear Mr. Crane:

By letter dated February 12, 2004, Exelon Generation Company, LLC, submitted a request for amendment that would increase the allowable high temperature in the main steam tunnel at Peach Bottom Atomic Power Station, Unit 2. In order to continue our review of your request, the Nuclear Regulatory Commission staff requires the additional information described in the enclosure. These questions were discussed in a telephone call with Mr. Doug Walker of your staff on March 15, 2004. In that call your staff agreed to a response date of March 29, 2004.

Sincerely,

/RA/

George F. Wunder, Project Manager, Section 2 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-277

Enclosure:

RAI cc w/encl: See next page

March 22, 2004 Mr. Christopher M. Crane, President and Chief Nuclear Officer Exelon Nuclear Exelon Generation Company, LLC 200 Exelon Way, KSA 3-E Kennett Square, PA 19348

SUBJECT:

PEACH BOTTOM ATOMIC POWER STATION, UNIT 2 - REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING MAIN STEAM TUNNEL TEMPERATURE (TAC NO. MC2018)

Dear Mr. Crane:

By letter dated February 12, 2004, Exelon Generation Company, LLC, submitted a request for amendment that would increase the allowable high temperature in the main steam tunnel at Peach Bottom Atomic Power Station, Unit 2. In order to continue our review of your request, the Nuclear Regulatory Commission staff requires the additional information described in the enclosure. These questions were discussed in a telephone call with Mr. Doug Walker of your staff on March 15, 2004. In that call your staff agreed to a response date of March 29, 2004.

Sincerely,

/RA/

George F. Wunder, Project Manager, Section 2 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-277

Enclosure:

RAI cc w/encl: See next page DISTRIBUTION:

PUBLIC PDI-2 R/F DRoberts GWunder SWall MOBrien ACRS CBixler, RI OGC EThrom RDennig BPham ADAMS Accession Number: ML040780982 OFFICE PDI-2/PM PDI-2/LA PDI-2/SC (A)

NAME GWunder MOBrien DRoberts DATE 03/22/04 03/22/04 03/22/04 OFFICIAL RECORD COPY

REQUEST FOR ADDITIONAL INFORMATION PEACH BOTTOM ATOMIC POWER STATION, UNIT 2 PROPOSED USE OF ALTERNATE SOURCE TERM (AST) METHODOLOGY

1. Please provide a description of the GOTHIC nodal model (include the GOTHIC version number) used to model the buildings (volumes, flow paths, active heat removal systems and heat structures, and their initial conditions). Identify the model used for the break flow, the model(s) used for heat transfer to structures, and the model(s) used for flow between volumes.

2. Please provide a discussion of the applicability of the GOTHIC subdivided volume model to the scenario being evaluated. Include references, based on the GOTHIC documentation, to recommended modeling approaches (for example, to connect flow paths between subdivided volume), parameters (for example, junction form loss coefficients and subdivided volume junction parameters such as the inertial length, hydraulic diameters and friction length between these volumes), and GOTHIC validation studies that relate to this scenario.

3. Please provide the results of the benchmarks against the loss of ventilation events, and the results for the license amendment request (LAR) calculation(s).

4. Identify the current licensing model (computer program or calculation). Provide a benchmark of the GOTHIC model to the current licensing model, using GOTHIC models which closely resemble the licensing model.

5. Please provide electronic copy(ies) of the GOTHIC input deck(s) (*.GTH) for the model(s) used for the LAR and the benchmarks. The staff may perform independent, confirmatory analyses with the CONTAIN 2.0 code. In addition, the input deck provides the full description of the nodal models and the GOTHIC models used for the LAR.

Enclosure

Peach Bottom Atomic Power Station, Units 2 and 3 cc:

Vice President, General Counsel and Rich Janati, Chief Secretary Division of Nuclear Safety Exelon Generation Company, LLC Bureau of Radiation Protection 300 Exelon Way Department of Environmental Protection Kennett Square, PA 19348 Rachel Carson State Office Building P.O. Box 8469 Site Vice President Harrisburg, PA 17105-8469 Peach Bottom Atomic Power Station Exelon Generation Company, LLC Board of Supervisors 1848 Lay Road Peach Bottom Township Delta, PA 17314 545 Broad Street Ext.

Delta, PA 17314-9203 Plant Manager Peach Bottom Atomic Power Station Mr. Richard McLean Exelon Generation Company, LLC Power Plant and Environmental 1848 Lay Road Review Division Delta, PA 17314 Department of Natural Resources B-3, Tawes State Office Building Regulatory Assurance Manager Annapolis, MD 21401 Peach Bottom Atomic Power Station Exelon Generation Company, LLC Dr. Judith Johnsrud 1848 Lay Road National Energy Committee Delta, PA 17314 Sierra Club 433 Orlando Avenue Resident Inspector State College, PA 16803 U.S. Nuclear Regulatory Commission Peach Bottom Atomic Power Station Manager-Financial Control & Co-Owner P.O. Box 399 Affairs Delta, PA 17314 Public Service Electric and Gas Company P.O. Box 236 Regional Administrator, Region I Hancocks Bridge, NJ 08038-0236 U.S. Nuclear Regulatory Commission 475 Allendale Road Manager Licensing-Limerick and Peach King of Prussia, PA 19406 Bottom Exelon Generation Company, LLC Mr. Roland Fletcher Nuclear Group Headquarters Department of Environment Correspondence Control Radiological Health Program P.O. Box 160 2400 Broening Highway Kennett Square, PA 19348 Baltimore, MD 21224 Correspondence Control Desk Exelon Generation Company, LLC 200 Exelon Way, KSA 1-N-1 Kennett Square, PA 19348

Peach Bottom Atomic Power Station, Units 2 and 3 cc:

Director - Licensing Mid-Atlantic Regional Operating Group Exelon Generation Company, LLC Nuclear Group Headquarters Correspondence Control P.O. Box 160 Kennett Square, PA 19348 Vice President-Licensing and Regulatory Affairs Exelon Generation Company, LLC 4300 Winfield Road Warrenville, IL 60555 Senior Vice President Mid-Atlantic Regional Operating Group Exelon Generation Company, LLC 200 Exelon Way, KSA 3-N Kennett Square, PA 19348 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 Manager License Renewal Exelon Generation Company, LLC 200 Exelon Way Kennett Square, PA 19348