ML052360262

Request for Additional Information Measurement Uncertainty Recapture Power Uprate

ML052360262
Person / Time
Site:	Calvert Cliffs
Issue date:	08/30/2005
From:	Milano P NRC/NRR/DLPM/LPD1
To:	Vanderheyden G Calvert Cliffs
Milano P, NRR/DLPM , 415-1457
References
TAC MC6210, TAC MC6211
Download: ML052360262 (5)

Text

August 30, 2005 Mr. George Vanderheyden, 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 RE: MEASUREMENT UNCERTAINTY RECAPTURE POWER UPRATE (TAC NOS. MC6210 AND MC6211)

Dear Mr. Vanderheyden:

By letter dated January 31, 2005, as supplemented on July 18, 2005, Calvert Cliffs Nuclear Power Plant (CCNPP), Inc. requested an amendment to the operating license and technical specifications authorizing an increase in the maximum steady-state thermal power at Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2.

The Nuclear Regulatory Commission staff is reviewing the information provided by CCNPP to support its application and has determined that additional information is needed to continue the review. The specific questions are found in the enclosed request for additional information (RAI). During a telephone call on August 17, 2005, the CCNPP staff indicated that a response to the RAI would be provided within 45 days.

Please contact me at (301) 415-1457 if you have any questions on this issue.

Sincerely,

/RA/

Patrick D. Milano, Sr. Project Manager, Section 1 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-317 and 50-318

Enclosure:

As stated cc w/encl: See next page

ML052360262 OFFICE PDI-1/PM PDI-1/LA SRXB/SC EMCB/SC PDI-1/SC NAME PMilano SLittle JNakoski MMitchell RLaufer DATE 08/25/05 08/25/05 08/23/05 08/29/05 08/30/05 Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2 cc:

President P.O. Box 33111 Calvert County Board of Baltimore, MD 21218 Commissioners 175 Main Street Mr. Loren F. Donatell Prince Frederick, MD 20678 NRC Technical Training Center 5700 Brainerd Road Carey Fleming, Esquire Chattanooga, TN 37411-4017 Sr. Counsel - Nuclear Generation Constellation Generation Group, LLC 750 East Pratt Street, 17th floor Baltimore, MD 21202 Lou Larragoite 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, Administrator Radioecology Environ Impact Prog Department of Natural Resources Nuclear Evaluations 580 Taylor Avenue Tawes State Office Building Annapolis, MD 21401 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Kristen A. Burger, Esquire Maryland People's Counsel 6 St. Paul Centre Suite 2102 Baltimore, MD 21202-1631 Patricia T. Birnie, Esquire Co-Director Maryland Safe Energy Coalition

REQUEST FOR ADDITIONAL INFORMATION REGARDING MEASUREMENT UNCERTAINTY RECAPTURE POWER UPRATE CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS. 1 AND 2 DOCKET NOS. 50-317 AND 50-318 By letter dated January 31, 2005, as supplemented on July 18, 2005, Calvert Cliffs Nuclear Power Plant (CCNPP), Inc. requested authorization to increase in the maximum steady-state thermal power at CCNPP, Unit Nos. 1 and 2, from 2700 megawatts thermal (MWt) to 2737 MWt, which is a 1.38% power uprate. To complete its review, the Nuclear Regulatory Commission staff requests the following information:

1. Discuss the effect, if any, from the proposed power uprate on the actuation setpoints for the diverse reactor scram, main turbine trip, and auxiliary feedwater system trip signals.

2. Provide a statement concerning whether CCNPP, Inc. and its vendor have ongoing processes to assure that the large-break and small-break loss-of-coolant accident analyses input values for CCNPP, Unit No. 1 conservatively bound the as-operated plant values for Unit No. 1. Provide a similar statement regarding CCNPP, Unit No. 2.

3. Discuss the results of the post-accident fuel cladding oxidation and the assumption regarding pre-accident oxidation levels to assure that the overall cladding oxidation remains below 17%.

4. In its letter dated July 18, 2005, the licensee stated (see answer to question no. 16) that the projected thermal power had not been updated for the purpose of calculating the projected reactor pressure vessel (RPV) neutron fluence values.

Provide the end-of-license (EOL) neutron fluence values for the RPVs based on either:

(1) a direct neutron transport code calculation of the impact of operating at power uprate conditions, or (2) a qualitative assessment of the impact of the proposed power uprate and a bounding quantitative calculation of the EOL neutron fluence values.

Based on the results of the EOL RPV neutron fluence evaluation, revise the July 18, 2005, response to question no. 17, as necessary, as it relates to the projected EOL material properties (upper shelf energy, nil-ductility transition reference temperature) for the CCNPP, Unit Nos. 1 and 2, RPVs.

Enclosure