ML18039A722

Riv Top Workshop NRC Updates

ML18039A722
Person / Time
Issue date:	02/13/2018
From:	Tanya Smith Policy and Oversight Branch
To:
References
Download: ML18039A722 (32)

Text

NRC Update on Initiatives The future belongs to those who prepare for it.

Region IV TOP Workshop Arlington, TX February 13, 2018 Todd Smith, PhD Emergency Preparedness Specialist U.S. Nuclear Regulatory Commission Ralph Waldo Emerson

• EP Rulemaking Activities Decommissioning Small Modular Reactor & Other New Technologies

• NUREG-0654/FEMA-REP-1 Revision 2

• EP Research Study of ORO Intermediate Phase Capabilities and Practices Study of Evacuation Time Estimates Studies to Inform and Validate Technical Approach to EP NRC Updates 2

Decommissioning Sites Kewaunee (Wisconsin)

October 2014 Crystal River 3 (Florida)

March 2015 Vermont Yankee (Vermont)

December 2015 San Onofre (California)

June 2015

4 Ft. Calhoun Oct 24, 2016 Indian Point Unit 2 April 2020 Unit 3 April 2021 Palisades Spring 2022 Pilgrim May 2019 Oyster Creek October 2018 Decommissioning Sites

• EP regulations do not address risk at permanently shutdown and defueled reactor sites

• Exemptions from regulations provide relief on a case-by-case basis

• Commission directed rulemaking to include consideration of a graded approach to EP (SRM SECY-14-0118)

• Rulemaking goals:

Decommissioning Rulemaking 5

Maintain reasonable assurance Maintain defense-in-depth Provide regulatory certainty and clarity

Advanced Notice of Proposed Rulemaking 6

Emergency Preparedness Physical Security Fitness for Duty Requirements for Certified Fuel Handlers Regulatory Approach for Decommissioning Application of Backfitting Protection Decommissioning Trust Funds Offsite and Onsite Liability Protection General Questions (e.g.,

Cumulative Effects of Regulation)

Federal Register (80 FR 72358), November 19, 2015

ANPR Areas of Interest 7

Diameter of circle shows relative number of comments submitted by topic

8 Illustrative Milestones

Level 1 Permanent cessation of operations and all fuel in spent fuel pool Level 2 Spent fuel has sufficiently decayed (10 hour1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> adiabatic heatup time)

Level 3 All fuel is in dry cask storage Level 4 All fuel removed from site Decommissioning Levels 9

Decommissioning EP Levels 10

EP Planning Basis 11

• The overall objective of EP is to provide dose savings for a spectrum of accidents that could produce offsite doses in excess of PAGs

• Planning basis elements consider distance, timing, materials

• EPZs are areas for which planning is needed to assure that prompt and effective actions can be taken to protect the public in the event of an accident

• After permanent cessation of operations:

The spectrum of accidents are fewer DBAs will not exceed EPA PAGs offsite At least 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> available before release occurs

NUREG-1738, Technical Study of Spent Fuel Pool Accident Risk at Decommissioning Nuclear Power Plants NUREG-2161, Consequence Study of a Beyond-Design-Basis Earthquake Affecting the Spent Fuel Pool for a U.S. Mark I Boiling Water Reactor Supporting Research Studies (ADAMS ML16110A416)

Analysis of Mitigative Actions Spent Fuel Decay Time Dose Rate of Accidental Radiological Release from Spent Fuel Pool Research to Support Rulemaking 12

• Implementation of a graded approach to EP Minimize licensing actions Regulatory standards commensurate with radiological risk Consistent with approved EP exemptions but based on considerations of EP as a separate layer of defense-in-depth

• Emergency Plan Change Process Transition to Levels Changes within Levels Changes in FSAR Changes in EAL Classifications and Scheme(s)

• Draft Regulatory Guide to accompany proposed rule Decommissioning Rulemaking 13

• Advance Notice of Proposed Rulemaking November 19, 2015

• Draft Regulatory Basis March 15, 2017

• Final Regulatory Basis November 2017

• Proposed Rule/Draft Regulatory Guidance Provide to Commission in May 2018

• Final Rule/Final Regulatory Guidance Goal: Provide to Commission CY2019 Decommissioning Rule Schedule 14

15 The Future of EP

• Rulemaking to develop a clear set of rules and guidance for small modular reactors (SMRs) and other new technologies (ONT)

Principle of dose-at-distance and consequence-oriented approach to determine EPZ size Risk-Informed, Performance Based Technology Neutral EP for SMRs & ONT 16

• Rule would consider Event classification and mitigation Protective actions Communications Command and control Staffing Radiological assessment

• Guidance General information (non-design specific)

Design specific guidance would be developed after rulemaking SMR & ONT Rulemaking 17

• Draft Regulatory Basis April, 2017

• Final Regulatory Basis November 2017 (ML17206A265)

• ACRS Subcommittee meeting August 2018

• ACRS full meeting October 2018

• Commission Submission October 2019

• Proposed Rule/Draft Regulatory Guidance January 2019 SMR & ONT Rulemaking Schedule 18

NUREG-0654/FEMA-REP-1 Revision Timeline 19 2013 Revision 2 development 2015 Distribution of draft Revision 2 for public comment 2016 Comment adjudication and draft Revision 2 rewrite/adjustments 2018 Issue Revision 2 after final management concurrence and OMB review

NRC Research in Emergency Preparedness 20

ORO Study The NRC seeks to better understand offsite response organization (ORO) capabilities and practices for protective actions in the intermediate phase of emergency response to a nuclear power plant (NPP) incident Study Areas Outcome NUREG/CR report to be published by March 2018 21

• Identification of radiological hot spots

• Relaxation of evacuation and relocation orders

• Food condemnation or embargo

• Drinking water safety

• Beyond the 10-mile emergency planning zone (EPZ)

• Notable observations

Evacuation Time Estimate (ETE) Study Applied research study to examine topics associated with the modeling and simulation of evacuations and independent verification of the NRCs methodology for ETE development Study Areas

• Shadow evacuation analysis

• Distance of evacuation travel

• Manual traffic control

• Determination of variable importance Outcome

• NUREG/CR report published late 2018

• NUREG/CR-7002 update prior to 2020 census 22

ETE Study Model Comparison EPZ POPULATION MODEL EPZ POPULATION MODEL STATS 0-10 MILE 0-10 MILE 20% SHADOW INTER-SECTIONS MILES OF ROAD LINKS/

CONNECTORS SMALL 0 - 50,000 7500 3000 174 1196 376/863 MEDIUM 50,000 - 200,000 200,000 30,000 449 3313 2645/3846 LARGE

> 200,000 325,000 60,000 974 3712 10605/14719 23

24

25 How does the NRC use this research?

MACCS What is MACCS?

• MELCOR Accident Consequence Code System

• Probabilistic analysis tool for developing realistic estimates of consequences of nuclear power plant incidents

• Developed by NRC and Sandia National Laboratory

• Extensive use by NRC and domestic and international organizations How is MACCS used?

• Cost-benefit analysis

• Level 3 Probabilistic Risk Assessment (PRA)

• Consequence studies

• Risk-informed decision-making 26

MACCS 27 Weather Data Site Data Source Term Dose Conversion Factors Food Chain Data Atmospheric Transport and Dispersion Output Measures Health Effects Land Contamination Economic Costs Displaced Population Emergency Phase Intermediate Phase Long-Term Phase Typical Duration

~ 1 week Weeks to years Months to years Protective Actions Evacuation Sheltering Relocation KI Ingestion Relocation Interdiction Decontamination Condemnation Exposure Pathways Cloudshine Groundshine Inhalation Skin Deposition Groundshine Inhalation of resuspended materials Groundshine Inhalation of resuspended materials Food & water ingestion

Example Gaussian Plume Segment Transport 28

MACCS Emergency Phase Modeling

• Protective actions (evacuation, sheltering, relocation, KI)

• Cohort timeline (general population, schools, special facilities, evacuation tail, shadow evacuees, non-evacuees)

How parameters are informed

• Evacuation time estimate (ETE) studies and traffic simulation codes

• MACCS modeling best practices

• Discussions with state and local authorities 29

EP Research The NRC is conducting a number of research studies to inform emergency preparedness regulations or guidance and to assess the impact of EP in reducing consequences Studies to Inform Regulations or Guidance

• EPZ Size Methodology of NUREG-0396

• Non-radiological impacts of evacuations

• MACCS model improvements Consequence Studies

• Sequoyah SOARCA

• Level 3 PRA 30

Back to the Future EP is evolving, but the NRCs mission to protect the health and safety of the public remains the same

• EP of the past informs the future NUREG-0396 planning basis

• Guidance updates incorporate decades of experience

• Research enhances our understanding and informs and validates our technical approach 31

Contact Information Todd Smith, PhD Ed Roach EP Specialist Senior EP Specialist NSIR/DPR/POB NSIR/DPR/POB (301)-287-3744 (301) 287-9229 todd.Smith@nrc.gov ed.roach@nrc.gov Robert Kahler, Chief NSIR/DPR/POB (301) 287-3756 robert.kahler.@nrc.gov 32