A Fail-Safe Control Rod Drive System for Nuclear Reactor

Primary Inventor: Krishna P. Singh
Contributing Inventor(s): Leyland Vann, Patrick Ingravallo
Date of Publication: 02/09/2017
Status: Published
Jurisdiction: US, International
Equipment Type: CRDS, SMR-160
Docket NumberHOL-067, HOL-067-US-CON
Publication Number: US 2017/0040070 A1, WO 2014025700 A2
Application Number: 15/288,436
Patent Number(s):

Related U.S. Application Data:

  • Provisional Application No. 14/417,628, previously published as US 2015/0325318 A1, and assigned Patent No.  US 9,496,057 on November 15, 2016.
  • Provisional Application No. 61/680,133 filed on August 6, 2012

Abstract: A control rod drive system (CRDS) for use in a nuclear reactor. In one embodiment, the system generally includes a drive rod mechanically coupled to a control rod drive mechanism (CRDM) operable to linearly raise and lower the to drive rod along a vertical axis, a rod cluster control assembly (RCCA) comprising a plurality of control rods insertable into a nuclear fuel core, and a drive rod extension (DRE) releasably coupled at opposing ends to the drive rod and RCCA. The CRDM includes an electromagnet which operates to couple the CRDM to DRE. In the event of a power loss or SCRAM, the CRDM may be configured to remotely uncouple the RCCA from the DRE without releasing or dropping the drive rod which remains engaged with, the CRDM and in position.