Comments on SR 97 chapters 4 and 5 and supporting documents

A review was conducted on Chapters 4 and 5 of the SKB SR 97 - Post Closure Safety Main Report, with a background study of Chapters 1-3, as well as a study of the related sections of support documents SKB TR 95-22, SKB TR 99-20 and SKB TR 99-07. Main comments include: (1) Need for Iteration and Integration between Model Conceptualization and Model Investigations; (2) Need for Reviews by Two Types of Experts; (3) Need for Structured Expert Elicitation and Documentation; (4) Need for Careful Definition of Base Scenario; (5) Suggestion of the Use of Zeroth Order Scenario; (6) Confusion in the Definition of 'Variables'; (7) Need to Ensure Inclusion of Tertiary and Higher-Order Coupled Processes; (8) Need to Consider Model Abstraction and Associated Uncertainty; (9) Need for Care in Handling Analyses at Different Levels of Details. Additional comments are made more specifically on the THMC diagrams