NL-13-0987, Capability to Perform Emergency Multi-Unit Offsite Dose Assessments

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Capability to Perform Emergency Multi-Unit Offsite Dose Assessments
ML13175A353
Person / Time
Site: Hatch, Vogtle, Farley  Southern Nuclear icon.png
Issue date: 06/24/2013
From: Ivey B
Southern Co, Southern Nuclear Operating Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-13-0987
Download: ML13175A353 (3)
v • d • e


Text

B.l UPete Ivey W

Southern Nuclear Vice i>resident Operating Company, Inc.

Regulatory Affa irs 40 Inverness Center Parkway Birmingham. Alabama 35242 Tel 205.992.7619 Fax 205.992.521 7 June 24, 2013 SOUTHERN'\

COMPANY Docket Nos: 50-321 50-348 50-424 50-366 50-364 50-425 NL-13-0987 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Joseph M. Farley Nuclear Plant -Units 1 and 2 Edwin I. Hatch Nuclear Plant - Units 1 and 2 Vogtle Electric Generating Nuclear Plant - Units 1 and 2 Capability to Perform Emergency Multi-Unit Offsite Dose Assessments

References:

1) NRC Letter, Commitment for Implementation of Multi-Unit Dose Assessment; Wiggins to Pollock, dated February 27, 2013.
2) NEI Letter, Commitment for Implementation of Multi-Unit Dose Assessment; Pollock to Wiggins, dated March 14,2013.

Ladies and Gentlemen:

In accordance with the referenced letters, Southern Nuclear Operating Company (SNC) hereby provides the following information concerning the capability to perform off-site dose assessment during an event involving multiple units at the Joseph M. Farley, Vogtle Electric Generating, or Edwin I. Hatch Nuclear Plants.

Currently, SNC uses Meteorological Information Dose Assessment System (MIDAS) from ASS Consulting, Inc. at the three sites. 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 at any affected location within 50 miles of the site. Source term information is derived from plant effluent monitors, reactor coolant system (RCS) or containment samples, field monitoring teams (FMT), or a default design basis accident scenario.

The current software in use at SNC does not have multi-unit dose assessment capability. However, discussions have been held with ASS Consulting Inc. on upgrades related to the new MIDAS multi-unit software; SNC intends to procure these upgrades.

The version of MIDAS currently in use at the three SNC sites has the capability to perform dose projections from multiple release points at a single unit. Additionally, the software can perform dose projections using event trees based on NUREG 1228, "Source Estimation During Incident Response to Severe Nuclear Power Plant Accidents', and NUREG/SR-0150, "RTM-96, Response Technical Manual'.

u.s. Nuclear Regulatory Commission I\IL-13-0987 Page 2 The basic functions are the calculation of dispersion of the released material as it travels downwind and the estimation of the resulting concentrations of this material.

The MIDAS software in use at SNC will be upgraded to combine the results of individual accidents at a single site or involving multiple units. This multi-accident mode supports individual accidents at different locations on-site.

SNC has approved a Purchase Requisition for the upgraded software. The software will be reviewed with the vendor by October 15, 2013. User acceptance testing will be complete by December 31, 2013 and user training will be completed in time to support a final implementation date at the Farley, Vogtle, and Hatch units, as well as at the Emergency Operations Facility supporting these units, no later than December 31, 2014.

SNC intends to implement by the noted date. The earlier dates provided are target projected dates, deSigned to help ensure fulfillment of the implementation date of December 31, 2014. Nevertheless, these dates have been entered into the SNC Corrective Action Program for tracking purposes under Condition Report

  1. 620232.

This letter does not contain any Regulatory Commitments.

Should you have any questions, please contact Ken McElroy at 205-992-7369.

Re;tt:::d. ~

B.l. Ivey Regulatory Affairs Vice President BU/OCV/md

U.S. Nuclear Regulatory Commission NL-13-0987 Page 3 cc: Southern Nuclear Operating Company Mr. S. E. Kuczynski, Chairman, President & CEO Mr. D. G. Bost, Executive Vice President & Chief Nuclear Officer Mr. T. A. Lynch, Vice President - Farley Mr. D. R. Madison, Vice President - Hatch Mr. T. E. Tynan, Vice President - Vogtle Mr. C. R. Pierce, Director - Regulatory Affairs Mrs. P. Reister, Fleet Emergency Preparedness Manager RType: CFA04.054; CHA02.004; CVC7000 U. S. Nuclear Regulatory Commission Mr. V. M. McCree, Regional Administrator Mr. R. E. Martin, NRR Project Manager - Hatch, Vogtle Mr. E. D. Morris, Senior Resident Inspector - Hatch Mr. L. M. Cain, Senior Resident Inspector - Vogtle Ms. E. A. Brown, NRR Project Manager - Farley Mr. P. K. Niebaum, Senior Resident Inspector - Farley Mr. J. R. Sowa, Senior Resident Inspector - Farley Alabama Department of Public Health Dr. D. E. Williamson, State Health Officer State of Georgia Mr. J. H. Turner, Environmental Director Protection Division Mr. Barty Simonton, Environmental Radiation Program Manager (Acting)

Nuclear Energy Institute Susan Perkins-Grew, Senior Director - Emergency Preparedness

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