BS IEC/TR 61838:2001

FOREWORD
INTRODUCTION
Clause
1 Scope
2 Reference documents
3 Definitions and abbreviations
   3.1 Definitions
4 Limitations regarding the use of PSA
5 The use of PSA: methods and results
   5.1 Introduction
   5.2 Use of PSA in the design of future NPPs
       5.2.1 Overall scope
       5.2.2 Methods
       5.2.3 Plant analysis and modelling I&C in PSA
   5.3 Benefits of the use of PSA for existing NPPs
6 The use of PSA for classification
   6.1 General
   6.2 Approach 1: time and reactor states based approach
       6.2.1 Use of PSA in conjunction with a functional
             deterministic method
       6.2.2 Classification of functions, systems and
             equipment
       6.2.3 Associated technical requirements
       6.2.4 Complementary use of PSA alongside the
             iterative design process
   6.3 Approach 2: quantitative importance based approach
       6.3.1 Quantitative assignment criteria
       6.3.2 Quantitative criteria
       6.3.3 Category assignment
       6.3.4 Classification procedure
       6.3.5 Determination of requirements
Annex A (informative) Proposal for modelling I&C in PSA
        A.1 Scope
            A.1.1 Background
            A.1.2 I&C modelling in PSA
        A.2 Modelling description
            A.2.1 Global description
            A.2.2 Sensor part
            A.2.3 Logic part
            A.2.4 Actuator part
        A.3 Quantitative analysis: unavailability values
            A.3.1 Use of less classified systems for
                  safety functions and modelling in PSA
            A.3.2 Sensor part
            A.3.3 Specific logic part
            A.3.4 Non-specific logic part
            A.3.5 Actuator part
        A.4 Use of modelling in the event trees of PSA
            A.4.1 Taking account of different I&C configurations
            A.4.2 Importance of the actuators
            A.4.3 Integration in PSA event trees
Annex B (informative) Bibliography