Primary Inventor: Krishna P. Singh
Contributing Inventor(s): John Griffiths
Date: Sep. 13, 2022
Status: Granted
Jurisdiction: US
Assignee: Holtec International
Equipment Type: Fuel Basket
Docket Number: HOL-137
Application Number: 17/220,560
Patent Number: US 11,443,862 B2

Prior Publication Data: US 2021/0343438 A1

Related U.S. Application Data: Provisional application No. 63/003,431, filed on Apr. 1, 2020.

Abstract: A radioactive nuclear waste storage system includes a cask comprising a hermetically sealed internal cavity configured for holding the waste such as spent nuclear fuel submerged in an inventory of water. One or more pressure surge capacitors disposed inside the cask include a vacuum cavity evacuated to sub-atmospheric conditions prior to storage of fuel in the cask. At least one rupture disk seals a vacuum chamber inside each capacitor. Each rupture disk is designed and constructed to burst at a predetermined burst pressure level occurring inside the cask external to the capacitor. This allows excess cask pressure occurring during a high pressure excursion resulting from abnormal operating conditions to bleed into capacitor, thereby returning the pressure inside the cask to acceptable levels. In one embodiment, the capacitors are located in peripheral regions of the cask cavity adjacent to the circumferential wall of the cask body.