skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: CRDM designs with separate SCRAM latch engagement and locking

Abstract

A control rod drive mechanism (CRDM) includes a lifting rod supporting a control rod and a holding mechanism comprising an electromagnetic circuit with magnetic poles drawn together when the electromagnetic circuit is energized to hold the lifting rod. The hold is released upon de-energizing the electromagnetic circuit. A translation mechanism linearly translates the lifting rod held by the holding mechanism. The holding mechanism may include a non-magnetic spacer between the magnetic poles that defines a gap between the drawn together magnetic poles. The translation mechanism may include latches configured to engage an upper end of the lifting rod, and the holding mechanism draws the magnetic poles together to hold the latches engaged with the upper end of the lifting rod. A four-bar cam assembly may be used to cam the latches closed in response to a vertical actuation force applied to the cam bars.

Inventors:
; ; ; ;
Issue Date:
Research Org.:
BWXT mPower, Inc., Charlotte, NC (United States); BWXT Nuclear Operations Group, Lynchburg, VA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1576350
Patent Number(s):
10410755
Application Number:
14/255,201
Assignee:
BWXT mPower, Inc. (Charlotte, NC); BWXT Nuclear Operations Group, Inc. (Lynchburg, VA)
Patent Classifications (CPCs):
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
G - PHYSICS G21 - NUCLEAR PHYSICS G21C - NUCLEAR REACTORS
DOE Contract Number:  
NE0000583
Resource Type:
Patent
Resource Relation:
Patent File Date: 2014 Apr 17
Country of Publication:
United States
Language:
English

Citation Formats

DeSantis, Paul K., Stambaugh, Kevin J., Goodyear, Brett T., Edwards, Michael J., and Ales, Matthew W.. CRDM designs with separate SCRAM latch engagement and locking. United States: N. p., 2019. Web.
DeSantis, Paul K., Stambaugh, Kevin J., Goodyear, Brett T., Edwards, Michael J., & Ales, Matthew W.. CRDM designs with separate SCRAM latch engagement and locking. United States.
DeSantis, Paul K., Stambaugh, Kevin J., Goodyear, Brett T., Edwards, Michael J., and Ales, Matthew W.. Tue . "CRDM designs with separate SCRAM latch engagement and locking". United States. https://www.osti.gov/servlets/purl/1576350.
@article{osti_1576350,
title = {CRDM designs with separate SCRAM latch engagement and locking},
author = {DeSantis, Paul K. and Stambaugh, Kevin J. and Goodyear, Brett T. and Edwards, Michael J. and Ales, Matthew W.},
abstractNote = {A control rod drive mechanism (CRDM) includes a lifting rod supporting a control rod and a holding mechanism comprising an electromagnetic circuit with magnetic poles drawn together when the electromagnetic circuit is energized to hold the lifting rod. The hold is released upon de-energizing the electromagnetic circuit. A translation mechanism linearly translates the lifting rod held by the holding mechanism. The holding mechanism may include a non-magnetic spacer between the magnetic poles that defines a gap between the drawn together magnetic poles. The translation mechanism may include latches configured to engage an upper end of the lifting rod, and the holding mechanism draws the magnetic poles together to hold the latches engaged with the upper end of the lifting rod. A four-bar cam assembly may be used to cam the latches closed in response to a vertical actuation force applied to the cam bars.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {9}
}

Patent:

Save / Share:

Works referenced in this record:

Multi-function magnetic jack control drive mechanism
patent, July 1986


Automatic controller for magnetic jack type control rod drive mechanism
patent, May 1987


Apparatus with linear movement
patent, February 1987


Hydraulic latch scram release mechanism
patent, February 1980


Method and apparatus for preventing relative rotation of tube members in a control rod drive mechanism
patent, August 2001


Nuclear reactor control apparatus
patent, November 1983


Apparatus for handling constituent elements of reactor core
patent, December 1989


Rod cluster having improved vane configuration
patent, September 1989


Regulating rod drive of nuclear reactor
patent, November 1978


Control element assembly position system
patent, July 2000


Hybrid nuclear reactor grey rod to obtain required reactivity worth
patent, November 1991


Tool for handling a cluster of rods of consumable poison
patent, July 1993


Reconstitutable control assembly having removable control rods with detachable split upper end plugs
patent, August 1992


Segmented coil assembly for control rod drive
patent, April 1994


Reconstitutable control assembly having removable control rods with detachable split upper end plugs
patent, February 1991


Advanced gray rod control assembly
patent, August 2008


Device for Controlling and Shutting-Down Pressurized-Water Nuclear Reactor
patent, May 1973


Rod assembly for nuclear reactors
patent-application, May 2009


Control rod driveline and grapple
patent, December 1987


Reconstitutable control assembly having removable control rods with detachable split upper end plugs
patent, December 1989


Monitoring control rod element assembly position
patent, July 2002


Nuclear reactor control apparatus
patent, October 1983


Electromagnetic safety device of a screw/nut type
patent, October 1986


Drive mechanism nuclear reactor control rod
patent, November 1978


Control rod drive mechanism for a nuclear reactor
patent, November 1976


Control rod drive mechanism
patent, July 1998


Operating devices for control rods in a nuclear reactor
patent, September 1984


Internal control rod drive for a BWR
patent, November 1994