ML071650232
| ML071650232 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 07/03/2007 |
| From: | Pickett D NRC/NRR/ADRO/DORL/LPLI-1 |
| To: | Spina J Calvert Cliffs |
| Pickett D, NRR/DORL, 415-1364 | |
| References | |
| TAC MD4237, TAC MD4238 | |
| Download: ML071650232 (4) | |
Text
July 3, 2007 Mr. James A. Spina, Vice President Calvert Cliffs Nuclear Power Plant, Inc.
Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, MD 20657-4702
SUBJECT:
CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS. 1 AND 2 -
REQUEST FOR ADDITIONAL INFORMATION REGARDING REVISION TO CONTAINMENT SUMP SURVEILLANCE REQUIREMENT TO VERIFY STRAINER INTEGRITY (TAC NOS. MD4237 AND MD4238)
Dear Mr. Spina:
By letter dated February 1, 2007, Calvert Cliffs Nuclear Power Plant, Inc. (the licensee) requested an amendment to revise its containment sump surveillance requirement to verify strainer integrity at the Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2.
The Nuclear Regulatory Commission (NRC) staff has reviewed the information provided and has determined that additional information is needed to complete its review. Enclosed is the NRC staffs request for additional information (RAI). As discussed with your staff, we understand that you intend to respond to the RAI within 45 days of receipt of this letter.
If you have any questions, please contact me at 301-415-1364.
Sincerely,
/RA/
Douglas V. Pickett, Senior Project Manager Plant Licensing Branch I-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-317 and 50-318
Enclosure:
As stated cc w/encl: See next page
ML071650232 OFFICE LPLI-1 LPLI-1/PM LPLI-1/LA SSIB/BC EMCB/BC LPLI-1/BC NAME DWoodyatt DPickett SLittle MScott KManoly as signed on MKowal DATE 6/21/2007 6/21/2007 6/20/2007 6/22/2007 4/ 02 /2007 7/03/2007
Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2 cc:
President Calvert County Board of Commissioners 175 Main Street Prince Frederick, MD 20678 Mr. Carey Fleming, Esquire Sr. Counsel - Nuclear Generation Constellation Generation Group, LLC 750 East Pratt Street, 17th floor Baltimore, MD 21202 Mr. Jay S. Gaines Director, Licensing Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, MD 20657-4702 Resident Inspector U.S. Nuclear Regulatory Commission P.O. Box 287 St. Leonard, MD 20685 Mr. R. I. McLean, Manager Nuclear Programs Power Plant Research Program Maryland Department of Natural Resources 580 Taylor Avenue (B wing, 3rd floor)
Tawes State Office Building Annapolis, MD 21401 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Ms. Kristen A. Burger, Esquire Maryland People's Counsel 6 St. Paul Centre Suite 2102 Baltimore, MD 21202-1631 Ms. Patricia T. Birnie, Esquire Co-Director Maryland Safe Energy Coalition P.O. Box 33111 Baltimore, MD 21218 Mr. Roy Hickok NRC Technical Training Center 5700 Brainerd Road Chattanooga, TN 37411-4017
Enclosure REQUEST FOR ADDITIONAL INFORMATION REVISION TO CONTAINMENT SUMP SURVEILLANCE REQUIREMENT CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS. 1 AND 2 DOCKET NOS. 50-317 AND 50-318 MECHANICAL AND CIVIL ENGINEERING BRANCH
- 1. Provide information showing the layout of the new strainer arrangement and its support system.
- 2. Provide the summary of evaluations performed by the licensee to show the structural adequacy of the new strainer design and its support system for the applicable loadings such as dead weight, differential pressure, thermal, seismic, and dynamic loadings.
- 3. Provide a summary of evaluations performed for the new strainer design acceptability from the consideration of dynamic effects associated with any potential high energy line breaks, pipe whip, jet impingement, and missile impact.
SAFETY ISSUES RESOLUTION BRANCH
- 1. In the license amendment request, the licensee stated that although the configurations of the existing trash racks and screens and the replacement sump strainer assemblies are different, they serve the same fundamental purpose. What are the bases to conclude that the trash racks and screen functions are retained in the replacement strainer? How is the design function of the removed trash racks addressed in the new design?
- 2. Does the strainer replacement represent a change from two independent sumps to a shared sump? If so, please justify the change.
- 3. How will Calvert Cliffs ensure that all parts of the strainers show no evidence of structural distress or abnormal corrosion and are not restricted by debris? How will Calvert Cliffs ensure that the strainers will not incur undetected latent damage (e.g.,
from maintenance or operations activities on or in the vicinity of the strainers) that could adversely impact the strainers performance?