Maximum Hypothetical Accident Analysis for the Natura Resources Molten Salt Research Reactor at Abilene Christian University

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2023-12

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Abstract

This work proposes a mechanism for and the consequences of a Maximum Hypothetical Accident at the Natura Resources Molten Salt Research Reactor on the campus of Abilene Christian University. This accident should be constructed as to have consequences that envelop all credible accident consequences. For this work, which is not exactly representative of evaluations performed for licensing, it is proposed to be a full-inventory fuel salt spill due to a catastrophic pipe failure coupled with a simultaneous loss of site power. Nuclide liberation from the salt was predicted from documentation from Oak Ridge National Laboratory’s Molten Salt Reactor Experiment and MATLAB, atmospheric transport was evaluated utilizing the methods presented in Regulatory Guide 1.145, which was coupled with dose coefficients from Federal Guidance Reports 11 and 12 and the ICRP dose compendium. After 60 days with no intervention and highly conservative conditions, the dose consequence to individuals directly on the property downwind of the building for the full duration of the accident was 0.8024 mSv, and 0.5680 mSv for those at the property line. These doses are well below the yearly allowable dose to members of the public, and demonstrate that the MSRR operations, including any credible accidents, do not endanger the health and safety of the public or environment.

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