Primary Inventor: Krishna P. Singh
Date: Aug. 15, 2023
Status: Granted
Jurisdiction: US
Assignee: Holtec International, Inc.
Equipment Type: HI-STORM CIS
Docket NumberHOL-078
Patent Number: US 11,728,061 B2
Application Number: 17/866,797

Prior Publication Data: US 2023/0005635 A1 – Jan. 5, 2023

Related U.S. Publication Data:

  • Continuation of application No. 17/200,333, filed on Mar. 12, 2021, now Pat. No. US 11,469,008 B2, which is continuation of application No. 16/453,282, filed on Jun. 26, 2019, now Pat. No. US 10,950,361 B2, which is a continuation of application No. 15/838,414, filed on Dec. 12, 2017, now Pat No. US 10,446,287 B2, which is a continuation of application No. 14/760,215, filed as application No. PCT/US2014/010967 on Jan. 10, 2014, now Pat. No.  US 9,852,822 B2.  
  • Provisional application No. 61/750,986, filed in January 10, 2013.

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.