Process Spill Dose Consequences

While the maximum potential consequences are similar for the process spill and the SCB fire DBAs, the process spill scenario dominates the overall risk to the public by several orders of magnitude as compared to all other DBAs. The maximum potential consequence at the exclusion area boundary (3000 m.) is calculated to be 2 Rem, and the sequence of events that results in this dose is assessed to be extremely unlikely. Accidents that are expected to occur within the lifetime of the facility are (conservatively) calculated to have dose consequences of up to several miliirem at the exclusion area boundary. These DBAs bound ail other potential accidents that have been postulated to occur in the facility. 

These process spill scenarios range from anticipated events which result in dose consequences of 2 to 13 mrem at the exclusion area boundary to extremely unlikely events which result in dose consequences of 1.8 Rem. 

The maximum potential dose consequence at the 3000 meter exclusion area boundary of 1.8 Rem for the process spill scenario is well below the evaluation guideline of 25 rem. 

Potential doses at the exclusion area boundary (3000 m) have been evaluated using the methodology described in Section 3.4.1. These techniques have been used to calculate the potential dose consequences resulting from the released source term for this DBA, which are 110% of the process spill scenario, or a maximum of 2 rem. The probability of a fire in an SCB, however, has been assessed in Appendix 3E.3 to be three or more orders of magnitude lower than spill events (Appendix 3E.2), and fires which could result in release of radioactive materials are even less likely. 

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