ML101050010

Request for Additional Information Regarding Annual Report of Changes to or Errors Discovered in an Acceptable Loss-off-Coolant Accident Evaluation Model Application for the Emergency Core Cooling System

ML101050010
Person / Time
Site:	Robinson
Issue date:	05/11/2010
From:	Orf T Plant Licensing Branch II
To:	Mccartney E Carolina Power & Light Co
Orf, T J, NRR/DORL/301-415-2788
References
TAC ME2833
Download: ML101050010 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 l"1ay 11, 2010 Mr. Eric McCartney, Vice President Carolina Power & Light Company H. B. Robinson Steam Electric Plant, Unit NO.2 3581 West Entrance Road Hartsville, South Carolina 29550

SUBJECT:

H. B. ROBINSON STEAM ELECTRIC PLANT, UNIT 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING ANNUAL REPORT OF CHANGES TO OR ERRORS DISCOVERED IN AN ACCEPTABLE LOSS-OF-COOLANT ACCIDENT EVALUATION MODEL APPLICATION FOR THE EMERGENCY CORE COOLING SYSTEM (TAC NO. ME2833)

Dear Mr. McCartney:

By letter dated November 24,2009, Carolina Power & Light Company (the licensee), now doing business as Progress Energy Carolinas, Inc., submitted to the Nuclear Regulatory Commission an annual report of changes to or errors discovered in an acceptable loss-of-coolant accident evaluation model application for the emergency core cooling system.

In order for the staff to complete its review of the licensee's submittal, we request that the licensee provide responses to the enclosed request for additional information (RAI). Based on discussions with your staff, we understand that you plan to respond to the enclosed RAI within 45 days of the date of this letter.

If you have any questions about this material, please contact me at (301) 415-2788.

Tracy J. Ort, Project Manager Plant Licensing Branch 11-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-261

Enclosure:

Request for Additional Information cc: Distribution via Listserv

REQUEST FOR ADDITIONAL INFORMATION INSPECTIONS OF THE REACTOR VESSEL NOZZLE ANNUAL REPORT OF CHANGES TO OR ERRORS DISCOVERED IN AN ACCEPTABLE LOSS-OF-COOLANT ACCIDENT EVALUATION MODEL APPLICATION FOR THE EMERGENCY CORE COOLING SYSTEM H.B. ROBINSON STEAM ELECTRIC PLANT, UNIT NO.2 CAROLINA POWER & LIGHT COMPANY DOCKET NO. 50-261 The Nuclear Regulatory Commission staff has reviewed the annual report of changes to or errors discovered in an acceptable loss-of-coolant accident evaluation model application for the emergency core cooling system for H. B. Robinson Steam Electric Plant (HBRSEP), Unit 2, and identified areas to be clarified by the licensee.

1. With respect to the annual report covering the period of March 24, 2009 through November 5, 2009, a summary table provides results from large break loss-of-coolant accident (LBLOCA) evaluation model and small break loss-of-coolant accident (SBLOCA) evaluation model, however, no specific identification of the exact errors is given.

Please identify: (1) the specific errors and their impact on the results shown in the table of the submittal; (2) which specific model is used for the radiation heat transfer and heat conduction; (3) which new data on pellet thermal conductivity as burnup is used for the RODEX computer code; (4) which approved methodologies are used for LBLOCA and SBLOCA evaluation; and (5) the reason why the results due to the errors show there are

-29 degrees Fahrenheit peak cladding temperature (PCT) change for LBLOCA evaluation and 8 degrees Fahrenheit PCT change for SBLOCA evaluation.

2. Please provide a detailed analysis of the errors including the initial conditions, assumptions, discussion of error and its corrective action, and sensitivity study of the impact from those error identified.

Mr. Eric McCartney, Vice President Carolina Power & Light Company H. B. Robinson Steam Electric Plant, Unit NO.2 3581 West Entrance Road Hartsville, South Carolina 29550

SUBJECT:

H. B. ROBINSON STEAM ELECTRIC PLANT, UNIT 2 - REQUEST FOR ADDITIONAL INFORMATION REGARDING ANNUAL REPORT OF CHANGES TO OR ERRORS DISCOVERED IN AN ACCEPTABLE LOSS-OF-COOLANT ACCIDENT EVALUATION MODEL APPLICATION FOR THE EMERGENCY CORE COOLING SYSTEM (TAC NO. ME2833)

Dear Mr. McCartney:

By letter dated November 24, 2009, Carolina Power & Light Company (the licensee), now doing business as Progress Energy Carolinas, Inc., submitted to the Nuclear Regulatory Commission an annual report of changes to or errors discovered in an acceptable loss-of-coolant accident evaluation model application for the emergency core cooling system.

In order for the staff to complete its review of the licensee's submittal, we request that the licensee provide responses to the enclosed request for additional information (RAI). Based on discussions with your staff, we understand that you plan to respond to the enclosed RAI within 45 days of the date of this letter.

If you have any questions about this material, please contact me at (301) 415-2788.

Sincerely, IRA!

Tracy J. Orf, Project Manager Plant Licensing Branch 11-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-261

Enclosure:

Request for Additional Information cc: Distribution via Listserv DISTRIBUTION:

PUBLIC RidsAcrsAcnw_MailCTR Resource LPL2-2 R/F RidsNrrDorlLPL2-2 Resource RidsNrrPMRobinson RidsRgn2MailCenter Resource RidsNrrLACSola Resource RidsNrrDssSrxb RidsOgcRp Resource ADAMS ACCESSION NO.: ML101050010 *via memo OFFICE LPL2-2/PM LPL2-2/LA CPNB/BC* LPL2-2/BC (A) LPL2-2/PM NAME TOrf RSoia GCranston DBroaddus (FSaba for) TOrf DATE 04/16/10 04/16/10 03/15/10 05/07/10 05/11/10 OFFICIAL RECORD COPY