Module VI Deterministic safety analysis F. Adorján

Transcript:Module VI Deterministic safety analysis F. Adorján:
Module VI Deterministic safety analysis F. Adorján HAEA (retired) ferencadorjan@gmail.com Learning objectives After completing Module 6, the trainee will be: able to understand the essence and the methodology of deterministic safety analyses. able to understand the significance of plant states and the related safety analyses. able to understand the concept of postulated initiating events and the methodology for selecting them. able to understand the difference between conservative and best estimate approaches. familiar with the different applications of deterministic analyses. 7 - 18 May & 18 - 29 June 2018 Module 6 - DSA 2 Contents Safety assessment – deterministic safety analysis Plant states Initiating events – postulated initiating event Acceptance criteria Types of deterministic safety analyses Conservative deterministic safety analysis Best estimate plus uncertainty analysis Sensitivity and uncertainty analysis Computer codes for deterministic safety analysis Verification and validation of computer codes Applications of deterministic safety analyses 7 - 18 May & 18 - 29 June 2018 Module 6 - DSA 3 Safety assessment – deterministic safety analysis 5 Safety assessment – deterministic safety analysis Learning objectives After completing this chapter, the trainee will be able to: Describe the main purpose of performing safety analyses. Identify whose responsibility is the performance of safety analyses. Describe the main goals/outcomes of deterministic safety assessments. 5 7 - 18 May & 18 - 29 June 2018 Module 6 - DSA 6 DETERMINISTIC SAFETY ANALYSIS - INTRODUCTION This Module covers Deterministic Safety Analyses, which are analytical studies aimed at demonstrating that safety requirements are met. That corresponds to detailed, computational model based calculations or series of such calculations. The initial and boundary conditions shall be well defined (DETERMINISTIC) and shall be as closely reflecting the real technology, as possible or practicable. They address all possible modes of normal operating conditions of the plant, assuming various initiating events. They are essential elements of the plant design process and their review is central element of the licensing process. 6 7 - 18 May & 18 - 29 June 2018 Module 6 - DSA 7 Safety analysis and safety assessment The terms “safety analysis” and “safety assessment” are sometimes used interchangeably. When assessment and analysis are distinguished, then the safety assessment is a general term, including any methodology to judge the safety of the plant or an activity; the term safety analysis is used for model based transient and accident analysis calculations. There are two main categories of