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Title: Control rod drive for reactor shutdown

Abstract

A means for rapidly shutting down or scramming a nuclear reactor, such as a liquid metal-cooled fast breeder reactor, and serves as a backup to the primary shutdown system. The control rod drive consists basically of an in-core assembly, a drive shaft and seal assembly, and a control drive mechanism. The control rod is driven into the core region of the reactor by gravity and hydraulic pressure forces supplied by the reactor coolant, thus assuring that common mode failures will not interfere with or prohibit scramming the reactor when necessary.

Inventors:
 [1];  [2];  [2];  [1]
  1. (Los Gatos, CA)
  2. (San Jose, CA)
Publication Date:
Research Org.:
General Electric Co., Sunnyvale, Calif. (USA). Breeder Reactor Dept.
OSTI Identifier:
862454
Patent Number(s):
US 3933581
Application Number:
05/476,173
Assignee:
United States of America as represented by United States Energy (Washington, DC) NETL
DOE Contract Number:
AT(04-3)-893
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
control; rod; drive; reactor; shutdown; means; rapidly; shutting; scramming; nuclear; liquid; metal-cooled; fast; breeder; serves; backup; primary; consists; basically; in-core; assembly; shaft; seal; mechanism; driven; core; region; gravity; hydraulic; pressure; forces; supplied; coolant; assuring; common; mode; failures; interfere; prohibit; liquid metal-cooled; pressure forces; control drive; common mode; drive mechanism; hydraulic pressure; rod drive; seal assembly; breeder reactor; reactor coolant; fast breeder; drive shaft; control rod; nuclear reactor; liquid metal; reactor shutdown; core region; core assembly; cooled fast; metal-cooled fast; /376/976/

Citation Formats

McKeehan, Ernest R., Shawver, Bruce M., Schiro, Donald J., and Taft, William E. Control rod drive for reactor shutdown. United States: N. p., 1976. Web.
McKeehan, Ernest R., Shawver, Bruce M., Schiro, Donald J., & Taft, William E. Control rod drive for reactor shutdown. United States.
McKeehan, Ernest R., Shawver, Bruce M., Schiro, Donald J., and Taft, William E. 1976. "Control rod drive for reactor shutdown". United States. doi:. https://www.osti.gov/servlets/purl/862454.
@article{osti_862454,
title = {Control rod drive for reactor shutdown},
author = {McKeehan, Ernest R. and Shawver, Bruce M. and Schiro, Donald J. and Taft, William E.},
abstractNote = {A means for rapidly shutting down or scramming a nuclear reactor, such as a liquid metal-cooled fast breeder reactor, and serves as a backup to the primary shutdown system. The control rod drive consists basically of an in-core assembly, a drive shaft and seal assembly, and a control drive mechanism. The control rod is driven into the core region of the reactor by gravity and hydraulic pressure forces supplied by the reactor coolant, thus assuring that common mode failures will not interfere with or prohibit scramming the reactor when necessary.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1976,
month = 1
}

Patent:

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  • A means is described for rapidly shutting down or scramming a nuclear reactor, such as a liquid metal-cooled fast breeder reactor. The system serves as a backup to the primary shutdown system. The control rod drive consists basically of an in-core assembly, a drive shaft and seal assembly, and a control drive mechanism. The control rod is driven into the core region of the reactor by gravity and hydraulic pressure forces supplied by the reactor coolant, thus assuring that common mode failures will not interfere with or prohibit scramming the reactor when necessary.
  • A temperature responsive, self-actuated nuclear reactor shutdown control rod assembly 10. The upper end 18 of a lower drive line 17 fits within the lower end of an upper drive line 12. The lower end (not shown) of the lower drive line 17 is connected to a neutron absorber. During normal temperature conditions the lower drive line 17 is supported by detent means 22,26. When an overtemperature condition occurs thermal actuation means 34 urges ring 26 upwardly sufficiently to allow balls 22 to move radially outwardly thereby allowing lower drive line 17 to move downwardly toward the core of themore » nuclear reactor resulting in automatic reduction of the reactor powder.« less
  • This patent describes a nuclear reactor having a reactor core and a reactor coolant flowing therethrough, a temperature responsive, self-actuated nuclear reactor shutdown control rod assembly, comprising: an upper drive line terminating at its lower end with a substantially cylindrical wall member having inner and outer surfaces; a lower drive line having a lower end adapted to be attached to a neutron absorber; a ring movable disposed about the outer surface of the wall member of the upper drive line; thermal actuation means adapted to be in heat exchange relationship with coolant in an associated reactor core and in contactmore » with the ring, and balls located within the openings in the upper drive line. When reactor coolant approaches a predetermined design temperature the actuation means moves the ring sufficiently so that the balls move radially out from the recess and into the space formed by the second portion of the ring thereby removing the vertical support for the lower drive line such that the lower drive line moves downwardly and inserts an associated neutron absorber into an associated reactor core resulting in automatic reduction of reactor power.« less