High-Density Subterranean Storage System for Nuclear Fuel and Radioactive Waste

Primary Inventor: Krishna P. Singh
Date of Publication: December 26, 2017
Status: Granted
Jurisdiction: US
Assignee: Holtec International, Inc.
Equipment Type: HI-STORM CIS
Docket NumberHOL-078
Publication Number: US 2018/0144841 A1
Application Number: 15/838,414

Related U.S. Publication Data: Provisional application No. 14/760,215, published as  US 2015/0357066 A1, and now Patent No.  US 9,852,822 B2.  Provisional application No. 61/750,986, filed in January 10, 2013.

PCT Filed: Jan. 10, 2014
PCT No.: PCT/US2014/010967
PCT Pub. NoWO 2014/110318 A1

Abstract: An underground ventilated system for storing nuclear waste materials. The system includes a storage module having an outer shell defining an internal cavity and an inner shell. A majority of the height of the outer shell may be disposed below grade. The outer shell may include a hermetically sealed bottom. First and second canisters are positioned in lower and upper portions within the cavity respectively in vertically stacked relationship. A centering and spacing ring assembly is interspersed between the first and second canisters to transfer the weight of the upper second canister to the lower first canister. The assembly may include centering lugs which laterally restrain the first and second canisters in case of a seismic event. A natural convection driven ventilated air system cools the canisters to remove residual decay heat to the atmosphere. In one non-limiting embodiment, the shells are made of steel.