Primary Inventor: Krishna P. Singh
Contributing Inventor(s): Stefan Anton
Date: Dec. 29, 2020
Status: Granted
Jurisdiction: US
Assignee: Holtec International
Equipment Type: MPC
Docket Number: HOL-124
Application Number: 16/568,078
Patent Number: US 10,878,973 B2

Prior Publication Data: US 2020/0082953 A1, Mar. 12, 2020

Related U.S. Application Data: Provisional application No. 62/729,482, filed on Sep. 11, 2018.

Abstract: A passively cooled storage module for spent nuclear fuel includes an elongated body including a top end, bottom end, sidewall, baseplate, detachable lid, and cavity for holding a fuel canister containing heat-emitting spent nuclear fuel assemblies. Cooling air inlet ducts spaced draw ambient cooling air radially inwards into a lower portion of the cavity. The air flows upwards in the cavity along the canister and is discharged from the top end of the module to atmosphere via natural circulation. The air inlet ducts may have a multi-angled and recurving configuration comprising one or more obliquely angled sections in one embodiment. The exterior inlet end openings of the inlet ducts are arranged at a higher elevation than the interior outlet end openings to prevent the ingress of standing and flood-related waters. The ducts and lid include radiation shielding features.