Offshore Power Systems Floating Nuclear Plants (1-8). Docket No. STN 50-437. Supplement No. 3

摘要

Supplement No. 3 to the Safety Evaluation Report for the Offshore Power System's application for a license to manufacture eight standardized floating nuclear plants in a shipyard-like facility in Jacksonville, Florida has been prepared by the Office of Nuclear Reactor Regulation of the Nuclear Regulatory Commission. This Supplement provides an evaluation of a refractory sacrificial bed, called a core ladle, proposed by Offshore Power Systems to be included in the design of the Floating Nuclear Plant to delay the melt-through penetration of molten core debris in the unlikely event of a core meltdown accident. This design feature is in response to a specific requirement in the Floating Nuclear Plant Final Environmental Statement, Part III, NUREG-0502, that the concrete pad beneath the reactor vessel be replaced with a pad constructed of magnesium oxide or other equivalent refractory material, that will provide increased resistance to melt-through by a molten reactor core, that will not react with core debris to form a large volume of gases and that will not have any deleterious effects on safety.