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|  DOE-STD -3009-94
3.3.2.3.1 Planned Design and Operational Safety
Improvements ................................................................. 38
3.3.2.3.2 Defense in Depth ............................................. 38
3 .3.2.3.3 Worker Safety ................................................. 42
3.3.2.3.4 Environmental Protection ................................ 43
3.3.2.3.5 Accident Selection ........................................... 45
3.4
Accident Analysis ........................................................................................... 48
3.4.1
Methodology .................................................................................... 51
3.4.2
Design Basis Accidents .................................................................... 51
3.4.2.X [Applicable DBA] ............................................................... 52
3.4.2.X.1 Scenario Development .................................. 53
3.4.2.X.2 Source Term Analysis ................................... 53
3.4.2.X.3 Consequence Analysis .................................. 53
3.4.2.X.4 Comparison to the Evaluation Guideline......53
3.4.2.X.5 Summary of Safety-Class SSCs and TSR
Controls ...................................................... 53
3.4.3
Beyond Design Basis Accidents ..................................................... 54
CHAPTER FOUR
Safety Structures, Systems, and Components
Purpose ......................................................................................................................... 55
Application of the Graded Approach ........................................................................... 55
Content Guidance
4.1
Introduction ..................................................................................................... 57
4.2
Requirements ................................................................................................... 57
4.3
Safety-class Systems, Structures, and Components ......................................... 57
4.3.X [Applicable Safety-class System, Structure, or Component] ............ 57
4.3.X.1 Safety Function ..................................................................... 57
4.3.X.2 System Description ............................................................... 58
4.3.X.3 Functional Requirements ...................................................... 58
4.3.X.4 System Eva luation ................................................................ 59
4.3.X.5 Controls (TSRs) .................................................................... 59
4.4
Safety-significant Structures, Systems, and Components ............................... 59
4.4.X [Applicable Safety-significant System, Structure, or Component] ........ 60
4.4.X.1 Safety Function ..................................................................... 60
4.4.X.2 System Description ............................................................... 60
4.4.X.3 Functional Requirements ...................................................... 61
4.4.X.4 System Evaluation ................................................................ 61
4.4.X.5 Controls (TSRs) .................................................................... 61
4.5
Specific administrative controls ...................................................................... 62
4.5.X [Applicable Specific Administrative Control] ....................................... 62
4.5.X.1 Safety Function ..................................................................... 62
4.5.X.2 SAC Description ................................................................... 62
4.5.X.3 Functional Requirements ...................................................... 63
4.5.X.4 SAC Evaluation .................................................................... 63
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