ML13183A061

Offsite Dose Assessment Capability During an Even Involving Multiple Release Sources

ML13183A061
Person / Time
Site:	North Anna
Issue date:	06/26/2013
From:	Heacock D Virginia Electric & Power Co (VEPCO)
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML13183A061 (5)

Text

VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 June 26, 2013 U.S. Nuclear Regulatory Commission Serial No. 13-243B Attention: Document Control Desk NL&OS/WDC R3 Washington, DC 20555 Docket Nos. 50-338/339 License Nos. NPF-4/7 VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNITS I AND 2 OFFSITE DOSE ASSESSMENT CAPABILITY DURING AN EVENT INVOLVING MULTIPLE RELEASE SOURCES In a letter to the Nuclear Energy Institute (NEI) from the NRC dated February 27, 2013 (ML13029A632), the NRC requested additional detailed information regarding licensee's site-specific, current or planned, multi-unit dose assessment capabilities. In a response to the Director, Nuclear Security and Incident Response, dated March 14, 2013 (ML13073A522), NEI notified the NRC that licensees would provide letters directly to the NRC describing multi-unit/multi-source dose assessment capability.

In accordance with the NEI letter, Virginia Electric and Power Company (Dominion) provides the following information regarding the capability to perform offsite dose assessment at North Anna Power Station (NAPS) during an event involving multiple release sources (e.g., the ability to assess concurrent releases from reactor containment and the spent fuel pool).

Currently, NAPS uses Meteorological Information Dose Assessment System (MIDAS) software from ABS Consulting, Inc., as its dose calculation model. MIDAS is a personal computer based program for rapidly assessing the radiological impact of accidents at nuclear power plants. It calculates total effective dose equivalent (TEDE) and thyroid doses. Source term information is derived from plant effluent monitors, reactor coolant system (RCS) or containment samples, field monitoring teams, or a default design basis accident scenario. In the event of a set of events involving multiple units/sources, individual dose assessment results can be summed to determine a total offsite dose assessment result.

Furthermore, an upgraded version of MIDAS software with a Multiple Accident Report Combiner (MARC) MIDAS Module has been procured. This MARC MIDAS Module can process up to five individual accidents and present results on a graphically displayed map with results combined for multiple release sources. The software upgrade will be implemented as indicated in the attached schedule.

Serial No. 13-243B Docket Nos. 50-338/339 Page 2 of 3 If you have any questions regarding this information, please contact Mr. Thomas Shaub at (804) 273-2763.

Sincerely, David A. Heacock President and Chief Nuclear Officer Virginia Electric and Power Company Commitments made in this letter: None

Attachment:

Implementation Schedule for MARC MIDAS Module for Multi-Unit Dose Assessment Capability COMMONWEALTH OF VIRGINIA )

)

COUNTY OF HENRICO )

The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by David A. Heacock, who is President and Chief Nuclear Officer of Virginia Electric and Power Company. He has affirmed before me that he is duly authorized to execute and file the foregoing document in behalf of that company, and that the statements in the document are true to the best of his knowledge and belief.

Acknowledged before me this d& 7- day of ,2013.

My Commission Expires: A3110 VICKI L.HULL Notary Public Commonwealth of Virginia Notary Public 140542 My Commission Expires May 31. 2014

Serial No. 13-243B Docket Nos. 50-338/339 Page 3 of 3 cc: Director, Office of Nuclear Reactor Regulation One White Flint North Mail Stop 13H16 11555 Rockville Pike Rockville, Maryland 20852-2738 U.S. Nuclear Regulatory Commission, Region II Regional Administrator 245 Peachtree Center Ave. NE Suite 1200 Atlanta, Georgia 30303-1257 Dr. V. Sreenivas Project Manager U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 08 G-9A 11555 Rockville Pike Rockville, MD 20852-2738 K. R. Cotton Project Manager U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 08 G-9A 11555 Rockville Pike Rockville, MD 20852-2738 NRC Senior Resident Inspector North Anna Power Station J. E. Reasor, Jr.

Old Dominion Electric Cooperative Innsbrook Corporate Center, Suite 300 4201 Dominion Blvd.

Glen Allen, Virginia 23060

Serial No. 13-243B Docket Nos. 50-338/339 ATTACHMENT IMPLEMENTATION SCHEDULE FOR MARC MIDAS MODULE FOR MULTI-UNIT DOSE ASSESSMENT CAPABILITY VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)

NORTH ANNA POWER STATION UNITS 1 AND 2

Serial No. 13-243B Docket Nos. 50-338/339 Attachment, Page 1 of 1 IMPLEMENTATION SCHEDULE The following table lists milestones to implement the MARC MIDAS Module for multi-unit dose assessment capability at North Anna Power Station. The milestones are being tracked in the Central Reporting System via LCO01 162.

Estimated Item No., Implementation Task Completion Date 1 Obtain MIDAS software with a Multiple Accident Complete Report Combiner (MARC) MIDAS Module 2 Complete acceptance testing of MARC MIDAS 09/05/2013 Module 3 Develop end-user documents (e.g., implementing 10/31/2013 procedures, guidelines, etc.)

4 Develop and conduct training on MARC MIDAS 09/19/2014 Module 5 Implement multi-unit dose assessment capability 12/31/2014