Shutdown System for a Nuclear Steam Supply System

Primary Inventor: Krishna P. Singh
Contributing Inventor(s): Joseph Rajkumar
Date of Publication:  October 30, 2018
Status: Granted
Jurisdiction: US
Assignee: SMR Inventec, LLC
Equipment Type: SMR Shutdown System
Docket Number: HOL-073
Application Number: 14/433,394
Patent No.: US 10,115,487 B2

Prior Publication Data: US 2016/0260508 A1

Related U.S. Application Data:

  • Continuation-in-part of application No. 14/620,390, filed on February 12, 2015, which is a continuation-in-part of application No. PCT/US2013/054961, filed on Aug 14, 2013.
  • Provisional application No. 61/709,436, filed on Oct. 4, 2012, provisional application No. 61/683,021, filed on Aug 14, 2012.

PCT Filed: October 4, 2013
PCT No: PCT/US2013/063405
PCT Pub NoWO 2014/099101 A2
PCT Pub Date: June 26, 2014

Abstract: A nuclear steam supply system having a shutdown system for removing residual decay heat generated by a nuclear fuel core. The steam supply system may utilize gravity-driven primary coolant circulation through hydraulic-ally interconnected reactor and steam generating vessels forming the steam supply system. The shutdown system may comprise primary and secondary coolant systems. The primary coolant cooling system may include a jet pump comprising an injection nozzle disposed inside the steam generating vessel A portion of the circulating primary coolant is extracted, pressurized and returned to the steam generating vessel to induce coolant circulation under reactor shutdown conditions. The extracted primary coolant may further be cooled before return to the steam generating vessel in some operating modes. The secondary coolant cooling system includes a pumped and cooled flow circuit operating to circulate and cool the secondary coolant, which in turn extracts heat from and cools the primary coolant.