ML13212A071

Seabrook Station, Response Regarding Implementation of Multi-Unit Dose Assessment Capability

ML13212A071
Person / Time
Site:	Seabrook
Issue date:	06/18/2013
From:	Walsh K T NextEra Energy Seabrook
To:	Document Control Desk, Office of New Reactors
References
SBL-L-13111
Download: ML13212A071 (5)

Text

.. era ENER SEABROOK June 18, 2013 SBK-L-13111 Docket No. 50-443 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Seabrook Station Response Regarding Implementation of Multi-Unit Dose Assessment Capability

References:

1. US NRC's Fukushima Near-Term Task Force Report, "Recommendations for Enhancing Reactor Safety in the 21st Century," dated July 12, 2011 (ADAMS Accession No. ML 112510271).

2. Nuclear Energy Institute (NEI) letter to NRC, "Industry Implementation of Multi-unit Dose Assessment Capability," dated January 28, 2013 (ADAMS Accession No. ML13028A200).

3. NRC letter to NEI requesting additional details on multi-unit dose assessment capability dated February 27, 2013 (ADAMS Accession No. ML13029A632).

4. NEI letter to NRC, "Commitment for Implementation of Multi-Unit Dose Assessment Capability," dated March 14, 2013 (ADAMS Accession No. ML13073A522).

The NRC Fukushima Near-Term Task Force (NTTF) Report (Reference

1) dated July 12, 2011, discussed the gap in capability for US commercial nuclear power plants to perform multi-unit dose assessments.

In January 2013, the Nuclear Energy Institute (NEI) provided to the NRC (Reference

2) survey results regarding licensees' capabilities to perform multi-unit dose assessments, implementation time frames to obtain multi-unit dose assessment capability, and compensatory measures for the interim period. In Reference 3, the NRC requested further detailed information regarding the current and the anticipated capabilities of sites to perform multi-unit dose assessment.

NEI informed the NRC in Reference 4 that the industry had elected to provide the requested details directly to the NRC staff.NextEra Energy Seabrook, LLC, P.O. Box 300, Lafayette Road, Seabrook, NH 03874 SBK-L-131 11 Page 2 NextEra Energy Resources Seabrook, LLC (NextEra Energy Seabrook) is providing the requested details on behalf of Seabrook Station. The enclosure to this letter includes discussion of the current capability to perform multi-source dose assessments, the interim compensatory measures for this capability, and the final permanent solution.This letter does not contain regulatory commitments.

Should you have any questions concerning the technical content of this letter, please contact Mr. David Currier, Emergency Preparedness Manager at (603) 773-7490.If you have any questions regarding this letter, please contact Mr. Michael O'Keefe, Licensing Manager at (603) 773-7745.Sincerely, NextEra Energy Seabrook, LLC Kevin T. Walsh Site Vice President SBK-L-13111 Page 3 cc: NRC Region I Administrator NRC Project Manager, Project Directorate 1-2 NRC Senior Resident Inspector Ms. Sue Perkins-Grew, Nuclear Energy Institute Homeland Security and Emergency Management New Hampshire Department of Safety Division of Homeland Security and Emergency Management Bureau of Emergency Management 33 Hazen Drive Concord, NH 03305 Mr. John Giarrusso, Jr., Nuclear Preparedness Manager The Commonwealth of Massachusetts Emergency Management Agency 400 Worcester Road Framingham, MA 01702-5399 Enclosure Seabrook Station Implementation of Multi-Unit/Multi-Source Dose Assessment Capability

1.0 Introduction

The NRC Fukushima Near-Term Task Force (NTTF) Report (Reference

1) dated July 12, 2011, discussed the gap in capability for US commercial nuclear power plants to perform multi-unit dose assessments.

In January 2013, the Nuclear Energy Institute (NEI) sent a letter to NRC (Reference

2) that reported survey results regarding licensees' current capabilities to perform multi-unit dose assessments.

The NEI letter also discussed licensees' expected implementation time frames and compensatory measures for the interim period. In Reference 3, the NRC requested further detailed information regarding the current and anticipated capabilities of sites to perform multi-unit dose assessments.

NEI informed the NRC in Reference 4 that the industry had elected to provide the requested details directly to the NRC staff. The requested details were to include:* A sumrnary of the current capability to perform multi-unit/multi-source dose assessment.

• The anticipated schedule to establish the capability on an interim and/or permanent basis.* Due dates associated with each key schedule action or milestone.

• A description of how the implementation schedule will be tracked.2.0 Summary of Current Multi-Unit/Multi-Source Capability Seabrook Station's dose assessment model, RADDOSE V is capable of multi source dose assessment.

In addition to calculating dose from the installed plant effluent release paths, RADDOSE V provides the capability of calculating the source term from a grab isotopic sample, field team monitoring data (for Unmonitored release), or direct input of a release rate. The model provides for up to 5 release paths per time step.Dose assessment input data is available both manually and automatically from the plant process computer.

The dose assessment software is located on multiple computers and in the absence of a plant data feed, manual input can be used.3.0 Interim Measures Based on the evaluation discussed in Section 2.0 above, no interim actions are required for Seabrook Station.

4.0 Permanent Solution Based on the evaluation discussed in Section 2.0 above, no interim actions are required for Seabrook Station.5.0 Schedule Based on the evaluation discussed in Section 2.0 above, no interim actions are required for Seabrook Station.6.0 References

1. US NRC's Fukushima Near-Term Task Force Report, "Recommendations for Enhancing Reactor Safety in the 21st Century," dated July 12, 2011 (ADAMS Accession No. ML 112510271).

2. NEI letter to NRC, "Industry Implementation of Multi-Unit Dose Assessment Capability," dated January 28, 2013 (ADAMS Accession No. ML13028A200).

3. NRC letter to NEI requesting additional details on multi-unit dose assessment capability, dated February 27, 2013 (ADAMS Accession No. ML13029A632).

4. NEI letter to NRC, "Commitment for Implementation of Multi-Unit Dose Assessment Capability," dated March 14, 2013 (ADAMS Accession No. ML13073A522).