ML072970180
| ML072970180 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 11/15/2007 |
| From: | Pickett D NRC/NRR/ADRO/DORL/LPLI-1 |
| To: | Spina J Calvert Cliffs |
| Pickett D, NRR/DORL, 415-1364 | |
| References | |
| TAC MD5509 | |
| Download: ML072970180 (5) | |
Text
November 15, 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 NO. 1 - REQUEST FOR ADDITIONAL INFORMATION RE: LONG-TERM CARBORUNDUM COUPON SURVEILLANCE PROGRAM (TAC NO. MD5509)
Dear Mr. Spina:
By letter dated May 10, 2007, Calvert Cliffs Nuclear Power Plant, Inc., submitted a license amendment to implement a long-term Carborundum coupon surveillance program at Calvert Cliffs Nuclear Power Plant (CCNPP), Unit No. 1. This amendment is in response to a license condition that required the submission of a coupon surveillance program for the CCNPP Unit No. 1 spent fuel pool (SFP). This program must verify that the Carborundum degradation rates assumed in the licensees analysis to prove criticality, as required by Title 10 of the Code of Federal Regulations, Section 50.68, remain valid over the 70-year life span of the Unit 1 SFP.
The Nuclear Regulatory Commission staff has reviewed the information provided and determined that additional information is required in order to complete the evaluation. The additional information being requested is enclosed. Based on discussions with your staff, we understand that you plan to respond within 60 days of receipt of this letter.
Please contact me at 301-415-1364 if you have any questions concerning this matter.
Sincerely,
/ra/
Douglas V. Pickett, Senior Project Manager Plant Licensing Branch I-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-317
Enclosure:
As stated cc w/encl: See next page
ML072970180 Office PM/LPL1-1 LA/LPL1-1 BC/CSGB BC/LPL1-1 Name DPickett SLittle AHiser as signed MKowal Date 11/15/07 11/15/07 10/19/07 11/15/07
Enclosure REQUEST FOR ADDITIONAL INFORMATION LONG-TERM CARBORUNDUM COUPON SURVEILLANCE PROGRAM CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NO. 1 DOCKET NO. 50-317 By letter dated May 10, 2007 (ML071440224), Calvert Cliffs Nuclear Power Plant, Inc., (the licensee), submitted a license amendment to implement a long-term Carborundum coupon surveillance program at Calvert Cliffs Nuclear Power Plant (CCNPP), Unit No. 1. This amendment is in response to a license condition that required the submission of a coupon surveillance program for the CCNPP Unit No. 1 spent fuel pool (SFP). This program must verify that the Carborundum degradation rates assumed in the licensees analysis to prove criticality, as required by Title 10 of the Code of Federal Regulations, Section 50.68, remain valid over the 70-year life span of the Unit 1 SFP. Based on review of the information submitted by the licensee, the NRC staff has determined that the following information is needed to complete its evaluation.
1.
On page 2 of Attachment 1, it is stated that the proposed long-term coupon surveillance program will consist of visual, weight, and dimensional determinations. Please provide justification for the elimination of sample thickness from your dimensional determinations.
2.
Given that the performance of Carborundum is dependent on its neutron attenuation, it is necessary that a licensee demonstrate that the materials neutron attenuation properties are adequate. As discussed in the staffs safety evaluation to License Amendment No.
267 (Agencywide Documents Access and Management Systems Accession No. ML041040160), the staff noted that the surveillance coupon program for Carborundum should also include the measurement of boron carbide areal density to accurately determine the degree of any material degradation. Therefore, discuss your plans to incorporate areal density testing into your proposed long-term surveillance program.
3.
Please provide the acceptance criteria for the visual, weight, and dimensional tests (also provide the acceptance criteria for neutron attenuation and areal density tests if added to the proposed long-term coupon surveillance program). In addition, discuss the corrective actions which will be taken when a test fails to meet the acceptance criteria.
4.
Please provide the results of the coupon surveillance performed in 2005. Did the results correspond to the extrapolation performed in response to NUREG-1705, Section 3.10.2.4? With this new data point, does the expected boron loss change for the 70-year life span of the Unit 1 SFP (26.2 percent)?
5.
On page 3 of Attachment 1, it is indicated that the new coupon tree for the proposed long-term surveillance program is expected to be installed in 2007. Please discuss the status of the new coupon tree being installed.
6.
Given that this is a new long-term surveillance program that has only a few prior data points, we request that you submit the results of future surveillances to the staff within 6 months after completion of the surveillance. The reporting requirements should be addressed in your surveillance program. The reporting requirements should include the baseline inspection results and the results of all subsequent inspections (i.e., visual, weight, and dimensional [include neutron attenuation and areal density if added to the surveillance program]).
Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2 cc:
Mr. Michael J. Wallace, President Constellation Generation Group 750 East Pratt Street Baltimore, MD 21202 Mr. John M. Heffley Senior Vice President and Chief Nuclear Officer Constellation Generation Group 1997 Annapolis Exchange Parkway Suite 310 Annapolis, MD 21401 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