Safety and Environmental Guidance for Fusion Conceptual Design Studies

ARIES Electronic Project Meeting
December 4, 1998

Comparison of Design Basis Safety Analysis and No-evacuation Assessment

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Safety Functions

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Accident Considerations

	No-Evacuation Assessment	Design Basis Assessment
Dose Criteria for Off-normal conditions (per event)	10 mSv (1 rem)	250 mSv (25 rem)
Type of Dose	Early dose to most exposed individual	Plume passage dose to most exposed individual
Type of Calculation	Best Estimate. Need to know expected response of facility	Conservative with safety margin documented
Risk criteria	Down to 10^-8/yr	Down to 10^-6/yr
Accident Scenario Selection	Broad range of events but no severe external events	Subset of the identified event scenarios. May use probabilistic and deterministic approaches Rationale for probabilistic approaches should be documented