Joint WG on Guidance for an Integrated Transport and Storage Safety Case for Dual Purpose Casks TM-44897 TM to Produce Consolidated Drafts of the IAEA’s New Transport Safety Standards Taking into Account the Results of the 2011 International Conference on the Safe and Secure Transport of Radioactive Material Yumiko Kumano Radioactive Waste and Spent Fuel Management Unit Division of Radiation, Transport and Waste Safety - NSRW

Overview Recent Development of Safety Standards related to management of radioactive waste (RW) and spent nuclear fuel (SNF) SSG-23 / DS-284 / SSG-15 Background / Objective of the WG Output and Work Plan of the WG 2 2

Structure of Safety Standards 2010 Under development Under development Published in 2011-12 Published in 2011 Approved by CSS in September 2008 Under development 2009 Under development 2009 Published in 2011 Under development NEW!! Under development

SSG-23: The Safety Case and Safety Assessment for Disposal of RW 1. Publication of SSG-23 SSG-23: The Safety Case and Safety Assessment for Disposal of RW 1. INTRODUCTION 2. DEMONSTRATING THE SAFETY OF RADIOACTIVE WASTE DISPOSAL 3. SAFETY PRINCIPLES AND SAFETY REQUIREMENTS 4. THE SAFETY CASE FOR DISPOSAL OF RADIOACTIVE WASTE 5. RADIOLOGICAL IMPACT ASSESSMENT FOR THE PERIOD AFTER CLOSURE 6. SPECIFIC ISSUES Evolution of the safety case Graded approach Defence in depth Robustness Time frame for the assessment etc. 7. DOCUMENTATION AND USE OF THE SAFETY CASE 8. REGULATORY REVIEW PROCESS

2. Current Status of DS284 1. INTRODUCTION 2009 1. INTRODUCTION BACKGROUND, OBJECTIVE, SCOPE, STRUCTURE 2. DEMONSTRATING THE SAFETY OF PREDISPOSAL MANAGEMENT OF RADIOACTIVE WASTE 3. SAFETY FUNDAMENTALS AND REQUIREMENTS SF, REQUIREMENTS FOR SC / SA 4. SC FOR PREDISPOSAL MANAGEMENT OF RW ROLE AND DEVELOPMENT OF THE SC, COMPONENTS, UNCERTAINTIES, DESIGN OPTIMIZATION, INTERACTION 5. RADIOLOGICAL IMPACT ASSESSMENT APPROACH, CONTEXT, DESCRIPTION SCENARIO DEVELOPMENT AND JUSTIFICATION MODELS, PERFORMANCE AND ANALYSIS OF THE RESULT 6. SPECIFIC ISSUES EVOLUTION OF THE SC, GRADED APPROACH DEFENCE IN DEPTH, RELIABILITY EXPECTED LIFETIME OF THE FACILITY LONG TERM STORAGE 7. DOCUMENTING AND USING THE SAFETY CASE 8. REGULATORY REVIEW PROSESS 2013? The Safety Case and Safety Assessment for Predisposal Management of Radioactive Waste

SSG-15: Storage of Spent Nuclear Fuel 3. Publication of SSG-15 SSG-15: Storage of Spent Nuclear Fuel 1. INTRODUCTION BACKGROUND, OBJECTIVE, SCOPE, STRUCTURE 2. PROTECTION OF HUMAN HEALTH AND ENVIRONMENT 3. ROLES AND RESPONSIBILITIES 4. MANAGEMENT SYSTEM SPENT FUEL MANAGEMENT RESOURCE MANAGEMENT PROCESS IMPLEMENTATION 5. SAFETY CASE AND SAFETY ASSESSMENT DOCUMENTATION OF THE SAFETY CASE 6. GENERAL SAFETY CONSIDERATIONS FOR STORAGE OF SPENT FUEL GENERAL DESIGN OF SPENT FUEL STORAGE FACILITIES COMMISSIONING OF SPENT FUEL STORAGE FACILITIES OPERATION OF SPENT FUEL STORAGE FACILITIES DECOMMISSIONING OF SPENT FUEL STORAGE FACILITIES 2012

Background / Objective of the WG Growing number of SNFs caused by delays in decision on SF disposition Necessity of additional storage capacity 1. Wet storage 2. Dry storage … Use of the DPCs designed for both transport / storage Intention to provide guidance to MSs for integrating safety cases for storage and transport in a holistic manner Establishment of a joint international working group Objective To provide an IAEA document containing recommendations and guidance for the structure and contents of an Integrated Safety Case for a dual purpose storage and transport cask. Recommendation for changes to be made to existing IAEA documents 7

Output and Work Plan of the WG (1) Target of the document Dual Purpose Casks – Transport / Storage - Guideline for establishing integrated safety cases in consideration of the interface issues between storage and transport casks. Storage period – 50 years (short term) / 100 years (long term) - Specific description with examples for explaining the application of the methodology, including aging assessments Mainly for metallic casks, consideration for canisters being added later April 2011: 1st Plenary meeting Adoption of the TOR Agreement with the objective and working methodologies Drafting of the IAEA document (outline and contents) Base document: Technical Guide – Package Design Safety Reports for the Transport of Radioactive Material (PDSAR) by European Association of Competent Authorities 8

Output and Work Plan of the WG (2) April 2012: 2nd Plenary meeting Review / Comment / Revise the first draft Major issues Definition of Safety Case for Dual Purpose Casks? How to address Acceptance Criteria? How to / To what extent discuss aging issues? Further integration / expansion of the scope of WG in the future? Discussion on recommendation to WASSC / TRANSSC Output: Draft Document on “Guidance for preparation of a safety case for a dual purpose cask containing spent fuel” Initial recommendation for WASSC / TRANNSC Conformity to future transport regulations with potential changes is an issue for dual purpose casks waiting for future transportation. Although some transitional arrangements would be necessary in the future, it would not be possible to propose specific arrangements at this moment because we do not know the new regulations yet. Therefore it is recommended to establish a procedure to stipulate the arrangements in the current TS-G 1.1. For instance, once new regulatory changes are established, a gap analysis should be made to identify any impact to the existing dual purpose casks. Compensating arrangements, if necessary, should be proposed at that time. (reference: Initial recommendation to WASSC) Current SSG-15 “Storage of Spent Nuclear Fuel” describes an “ageing management program”, only generally. It would be more informative for member states if it could include a guideline for preparing an “ageing management program”. Therefore, it is recommended to WASSC to include the final text from 1.10(d), by the end of 2013, in the SSG-15 “Storage of Spent Nuclear Fuel” as an ANNEX. 9

Output and Work Plan of the WG (2) November 2012: Consultancy Review / Comment to the draft from the second plenary meeting Consistency among sections Discussion on future plan for the WG Discussion on recommendation to WASSC / TRANSSC Output: Further improved document (Restructured Table of Contents / Word Definitions in relation to design process etc.) Draft recommendation to WASSC / TRANSSC April 2013: 3rd Plenary meeting Review / Comment / Revise the latest draft Final draft to be prepared for publication Finalize recommendation to WASSC / TRANSSC 10

Initial recommendation to TRANSSC(1) Conformity to future transport regulations with potential changes is an issue for DPCs waiting for future transportation. Any change of the transport regulations shall consider that in the section Transitional Arrangements that DPCs are considered in an appropriate way so that they can be operated after storage. This includes not only future DPC designs but also those DPCs already fabricated and being used for storage of spent fuel. After regulatory changes are established, a gap analysis should be made to identify any impact to the dual purpose casks safety case and to existing DPCs. Compensating arrangements, if necessary, should be proposed at that time. The gap analysis should consider change in regulations and change in knowledge since the previous approval period. 11

Initial recommendation to TRANSSC(2) The key issue is how to maintain the DPCSC for transport during storage – recognizing that storage may be for an extended time – so that the DPC can be used for transport regardless of the period of storage. This requires periodic review of the SC and periodic inspections of the DPC. TRANSSC shall consider the introduction of DPC packages in the regulatory regime considering aging to harmonize transport package design approval with that for storage. There should be a requirement or guidance in the transport regulations to consider aging for packages that are intended to be used for storage of spent fuel and transport. 12

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