Molten salt reactors (MSRs) are often advocated as a radical but worthwhile alternative to traditional reactor concepts based on solid fuels. In a paper published in the Annals of Nuclear Energy in January 2015, Ali Ahmad, Edward McClamrock and Alexander Glaser study the resource requirements and proliferation-risk attributes of denatured molten salt reactors.
The analysis presented in the paper confirms that MSRs could offer significant advantages with regard to resource efficiency compared to conventional thermal reactors based on light-water reactor technology. Depending on specific design choices, even fully denatured reactors could reduce uranium and enrichment requirements by approximately a factor of 3–4, even when operated on an open fuel cycle. As for the implications associated with proliferation risk, fully denatured single-fluid reactors using low-enriched make-up fuel appear as the most promising candidate technology minimizing overall proliferation risks and should, in our view, therefore receive particular attention despite being less attractive from the perspective of resource utilization.