For Official Use NEA/RWM/IGSC/A(2009)3 Organisation de Coopération et de Développement Économiques Organisation for Economic Co-operation and Development 29-Oct-2009 ___________________________________________________________________________________________ English - Or. English NUCLEAR ENERGY AGENCY RADIOACTIVE WASTE MANAGEMENT COMMITTEE For Official Use NEA/RWM/IGSC/A(2009)3 Integration Group for the Safety Case (IGSC) Cementitious Materials in Safety Cases for Geological Repositories for Radioactive Waste: Role, Evolution and Interactions A Workshop of the NEA IGSC, hosted by ONDRAF/NIRAS 17-20 November 2009 Brussels, Belgium English - Or. English JT03273176 Document complet disponible sur OLIS dans son format d'origine Complete document available on OLIS in its original format NEA/RWM/IGSC/A(2009)3 Cementitious Materials in Safety Cases for Geological Repositories for Radioactive Waste: Role, Evolution and Interactions BRUSSELS, BELGIUM 17-20 November 2009 A workshop organised by the OECD/NEA Integration Group for the Safety Case and hosted by ONDRAF/NIRAS Final Programme 2 NEA/RWM/IGSC/A(2009)3 CEMENTITIOUS MATERIALS IN SAFETY CASES FOR GEOLOGICAL REPOSITORIES FOR RADIOACTIVE WASTE: ROLE, EVOLUTION AND INTERACTIONS An NEA IGSC Workshop Hosted by ONDRAF/NIRAS Brussels, Belgium 17-20 November 2009 Final Programme FOCUS OF THE WORKSHOP Cementitious materials will be used in almost every programme for geological disposal of radioactive waste, as, for example, many concepts use cementitious materials in grouts and plugs. Cementitious materials are in routine use as industrial materials, but have mainly been studied with respect to their evolution over periods on the order of several decades. However, the disposal of long-lived radioactive wastes requires understanding and assessment of the interactions of cementitious materials with other repository materials, host rocks and ground waters over thousands of years. There are currently no international co-operative tasks on this topic; hence, the need for an international workshop. The objectives of the workshop will be to bring together the wide range of people necessarily involved in supporting safety case development and having an interest in cementitious materials, namely cement and concrete experts, repository designers, scientists, safety assessors, disposal programme managers and regulators. The workshop will focus on: • The uses of various cementitious materials in the different repository designs. • The evolution of cementitious materials over long time scales (1 000’s to 100 000’s of years). • Cross-cutting issues: namely, the interaction of different cementitious materials with surrounding components of the repository (e.g., waste, container, buffer, backfill, host rock). The workshop will include plenary sessions that will present state-of-the-art information on repository design and the phenomenology of cementitious materials and their interactions. In addition, dedicated working group sessions will discuss key safety assessment and safety case questions in more detail. For example: • How strong is the scientific basis for incorporating the various different aspects of the behaviour and interactions of cementitious materials in safety assessments and safety cases? 3 NEA/RWM/IGSC/A(2009)3 • How can the behaviour and interactions of cementitious materials best be incorporated within the safety case, and how can the safety case be used to help inform repository design choices? • Which are the main open questions and uncertainties? The workshop is open to organizations of all NEA Member Countries active in the field of nuclear waste management. The aim of this workshop is to share experience across a range of disciplines, in order to aid the application of current understanding to the context of deep geological disposal. Thus, participation is encouraged from cement and concrete experts, repository designers, scientists, safety assessors, disposal programme managers and regulators who have an interest in the topic. Participation from the academic community and cement industry is also welcome. SCIENTIFIC PROGRAMME COMMITTEE The Scientific Programme Committee defines the workshop scope and agenda, invites speakers and session leaders, and makes decision regarding poster presentations. The Committee will also review the workshop proceedings prior to publication. The members of the Scientific Programme Committee are: M. Van Geet (ONDRAF/NIRAS, host), D. Bennett (TerraSalus Ltd.), X. Bourbon (Andra), B. Forinash (NEA), D. Ilett (Environmental Agency of England and Wales), K. Kunc (RAWRA), S. Norris (NDA), R. Pabalan (CNWRA), D. Pellegrini (IRSN), I. Puigdomenech (SKB), and B. Schwyn (Nagra). 4 NEA/RWM/IGSC/A(2009)3 WORKSHOP PROGRAMME DAY 1 – 17 November 2009 09:00 – 09:30 Welcome Addresses ONDRAF/NIRAS, NEA Introduction: Scope and Objectives of the Workshop Maarten VAN GEET, Programme Committee (ONDRAF/NIRAS, Belgium) 09:30 – 10:15 INTRODUCTORY PRESENTATION: Context for the Workshop The use of cementitious materials in different national programmes: functions, similarities, differences and the main questions and interactions David BENNETT (TerraSalus Consulting, UK) 10:15 SESSION I: USE AND EVOLUTION OF CEMENTITIOUS MATERIALS Chair: Jason MARTINO (AECL, Canada) Rapporteur: Roberto PABALAN (CNWRA, USA) Each presentation is 20 minutes with 10 minutes for questions and discussion 10:15 – 10:45 Engineering Feasibility for the Fabrication and Emplacement of Cementitious Repository Materials: Results from the EC-ESDRED Project Maria CRUZ ALONSO (IETcc of the Spanish National Research Council) and Jose Luis GARCÍA SIÑERIZ (AITEMIN), Spain 10:45 – 11:15 Break and poster session 11:15 – 11:45 Compositions and Use of Cementitious Materials: Experience From Onkalo Johanna HANSEN (Posiva, Finland) 11:45 – 12:15 Upscaling of Mechanical and Hydromechanical Aspects of Cementitious Materials Jian-Fu SHAO and Nicholas BURLION (LML-University of Lille, France) 12:15 – 13:30 Lunch and poster session 13:30 – 14:00 Chemical Evolution of Cementitious Materials Barbara LOTHENBACK (EMPA) and Erich WIELAND (PSI), Switzerland 5 NEA/RWM/IGSC/A(2009)3 14:00 – 14:30 Implications for Solubility and Retention of Radionuclides over Long Timescales Steve WILLIAMS and Simon NORRIS (NDA, UK) 14:30 – 14:45 Introduction to the Working Groups Format, topics, objectives, etc. Workshop participants will be divided into several working groups to discuss topics related to central themes of the plenary session and the integration of information in the safety case (see annex A). Each working group will address one or two questions, to be assigned. 14:45 WORKING GROUP S SESSION I 14:45 – 16:45 Parallel working group session 16:45 – 17:30 break + poster session 17:30 – 18:00 Working group reporting (5-10 minutes each) Moderated by Chair and Rapporteur of Session I 19:00 – 22:00 Workshop Dinner END OF DAY 1 6 NEA/RWM/IGSC/A(2009)3 DAY 2 – 18 November 2009 09:00 SESSION II: CROSS-CUTTING ISSUES – INTERACTION OF CEMENTITIOUS MATERIALS WITH REPOSITORY COMPONENTS Chair: Colin WALKER (JAEA, Japan) Rapporteur: Ignasi PUIGDOMENECH (SKB, Sweden) Each presentation is 20 minutes with 10 minutes for questions and discussions 09:00 – 09:30 Interaction of Cementitious Materials with High-level Waste (HLW) Karel LEMMENS (SCK•CEN, Belgium) 09:30 – 10:00 Alkaline Plume on Crystalline Rock Russell ALEXANDER (Bedrock Geosciences, Switzerland) 10:00 – 10:30 Alkaline Plume on Clayey Material François MARSAL (IRSN, France) 10:30 – 11:00 Overview of Recent and Future Work on Material Development and Usage of Cementitious Materials in Salt Repositories Ralk MAUKE and Jürgen WOLLRATH (BfS); Nina MÜLLER-HOEPPE (DBE); Dirk-Alexander BECKER and Ulrich NOSECK (GRS-Braunschweig); Germany 11:00 – 11:30 Break and poster session 11:30 – 12:00 Corrosion Aspects of Steel Radioactive Waste Containers in Cementitious Materials Nick SMART (Serco, UK) 12:00 – 12:30 Consequences of Chemical Interactions at the Interface Between Cement and Clay Barriers – Potential Effects on Gas Migration Paul MARSCHALL (Nagra, Switzerland) 12:30 – 14:00 Lunch and poster session 7 NEA/RWM/IGSC/A(2009)3 14:00 PARALLEL WORKING GROUPS SESSION II Workshop participants will again be divided into several working groups to discuss topics related to central themes of the plenary session and the integration of information in the safety case (see Annex A). Each group will address 1 or 2 questions, to be assigned. 14:00 – 16:00 Parallel working group session 16:30 – 17:15 Break and poster session 17:15 – 18:00 Working group reporting (5-10 minutes each) Moderated by Chair and Rapporteur of Session II END OF DAY 2 8 NEA/RWM/IGSC/A(2009)3 DAY 3 – 19 November 2009 09:00 SESSION III: INTEGRATION IN THE SAFETY CASE AND IMPLICATIONS FOR LONG-TERM SAFETY Chair: Lawrence JOHNSON (Nagra, Switzerland) Rapporteur: David BENNETT (TerraSalus Consulting, UK) Each presentation is 20 minutes with 10 minutes for questions and discussions 09:00 – 09:30 Strategic Choices in the Belgian Supercontainer Design and its Treatment in a Safety Case Maarten VAN GEET (ONDRAF/NIRAS) and Eef WEETJENS (SCK•CEN), Belgium 09:30 – 10:00 Safety Case Approach for KBS Repository in Crystalline Rock Barbara PASTINA (Saanio & Riekkola Oy, Finland), Jarmo LEHIKOINEN (B+Tech Oy) and Ignasi PUIGDOMENECH (SKB, Sweden) 10:00 – 10:30 Environmental Safety Case and Cement-related Issues for Intermediate-level Waste in a Co-located Geological Disposal Facility Simon NORRIS and Steve WILLIAMS (NDA, UK) 10:30 – 11:00 Break 11:00