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Title: High temperature control rod assembly

Abstract

A high temperature nuclear control rod assembly comprises a plurality of substantially cylindrical segments flexibly joined together in succession by ball joints. The segments are made of a high temperature graphite or carbon-carbon composite. The segment includes a hollow cylindrical sleeve which has an opening for receiving neutron-absorbing material in the form of pellets or compacted rings. The sleeve has a threaded sleeve bore and outer threaded surface. A cylindrical support post has a threaded shaft at one end which is threadably engaged with the sleeve bore to rigidly couple the support post to the sleeve. The other end of the post is formed with a ball portion. A hollow cylindrical collar has an inner threaded surface engageable with the outer threaded surface of the sleeve to rigidly couple the collar to the sleeve. the collar also has a socket portion which cooperates with the ball portion to flexibly connect segments together to form a ball and socket-type joint. In another embodiment, the segment comprises a support member which has a threaded shaft portion and a ball surface portion. The threaded shaft portion is engageable with an inner threaded surface of a ring for rigidly coupling the support member tomore » the ring. The ring in turn has an outer surface at one end which is threadably engageably with a hollow cylindrical sleeve. The other end of the sleeve is formed with a socket portion for engagement with a ball portion of the support member. In yet another embodiment, a secondary rod is slidably inserted in a hollow channel through the center of the segment to provide additional strength. A method for controlling a nuclear reactor utilizing the control rod assembly is also included.« less

Inventors:
 [1]
  1. (Solana Beach, CA)
Publication Date:
Research Org.:
GENERAL ATOMICS
OSTI Identifier:
868100
Patent Number(s):
US 5075072
Assignee:
General Atomic (San Diego, CA) OSTI
DOE Contract Number:
AC03-88SF17367
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
temperature; control; rod; assembly; nuclear; comprises; plurality; substantially; cylindrical; segments; flexibly; joined; succession; ball; joints; graphite; carbon-carbon; composite; segment; hollow; sleeve; receiving; neutron-absorbing; material; form; pellets; compacted; rings; threaded; bore; outer; surface; support; post; shaft; threadably; engaged; rigidly; couple; formed; portion; collar; inner; engageable; socket; cooperates; connect; socket-type; joint; embodiment; coupling; engageably; engagement; secondary; slidably; inserted; channel; center; provide; additional; strength; method; controlling; reactor; utilizing; included; threaded surface; neutron-absorbing material; temperature control; hollow cylindrical; rod assembly; assembly comprises; provide additional; surface portion; absorbing material; control rod; nuclear reactor; outer surface; carbon composite; substantially cylindrical; reactor utilizing; threadably engaged; segment comprises; shaft portion; cylindrical sleeve; nuclear control; hollow channel; temperature nuclear; temperature graphite; threadably engage; sorbing material; ball joint; carbon-carbon composite; /376/

Citation Formats

Vollman, Russell E. High temperature control rod assembly. United States: N. p., 1991. Web.
Vollman, Russell E. High temperature control rod assembly. United States.
Vollman, Russell E. 1991. "High temperature control rod assembly". United States. doi:. https://www.osti.gov/servlets/purl/868100.
@article{osti_868100,
title = {High temperature control rod assembly},
author = {Vollman, Russell E.},
abstractNote = {A high temperature nuclear control rod assembly comprises a plurality of substantially cylindrical segments flexibly joined together in succession by ball joints. The segments are made of a high temperature graphite or carbon-carbon composite. The segment includes a hollow cylindrical sleeve which has an opening for receiving neutron-absorbing material in the form of pellets or compacted rings. The sleeve has a threaded sleeve bore and outer threaded surface. A cylindrical support post has a threaded shaft at one end which is threadably engaged with the sleeve bore to rigidly couple the support post to the sleeve. The other end of the post is formed with a ball portion. A hollow cylindrical collar has an inner threaded surface engageable with the outer threaded surface of the sleeve to rigidly couple the collar to the sleeve. the collar also has a socket portion which cooperates with the ball portion to flexibly connect segments together to form a ball and socket-type joint. In another embodiment, the segment comprises a support member which has a threaded shaft portion and a ball surface portion. The threaded shaft portion is engageable with an inner threaded surface of a ring for rigidly coupling the support member to the ring. The ring in turn has an outer surface at one end which is threadably engageably with a hollow cylindrical sleeve. The other end of the sleeve is formed with a socket portion for engagement with a ball portion of the support member. In yet another embodiment, a secondary rod is slidably inserted in a hollow channel through the center of the segment to provide additional strength. A method for controlling a nuclear reactor utilizing the control rod assembly is also included.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1991,
month = 1
}

Patent:

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  • This patent describes a control rod assembly for use in nuclear reactor control. It comprises segments, each the segment being made of a graphite composite material, each the segment having a chamber for containing neutron-absorbing material, wherein the chamber compromises a hollow cylindrical sleeve having a first end formed with an opening for receiving the neutron-absorbing material, and having a second end formed with a sleeve bore and an outer sleeve surface; a cylindrical weight-bearing support post positioned substantially centrally of the sleeve, the support post having a first end formed as a ball surface portion and a second endmore » formed as a ball surface portion and a second end formed as a shaft, the shaft being engageable with the sleeve bore for rigidly coupling the support post axially within the hollow sleeve, a hollow cylindrical collar having a socket lip portion correspondingly shaped to receive the ball surface portion of an adjacent support post, and having an inner surface for engaging the outer sleeve surface on the second end of the sleeve to rigidly couple the collar to the sleeve.« less
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  • The valve assembly for use with high temperature and high pressure fluids has inner and outer spaced shells and a valve actuator support of inner and outer spaced members which are connected at their end portions to the inner and outer shells, respectively, to extend substantially normal to the longitudinal axis of the inner shell. A layer of resilient heat insulating material covers the outer surfaces of the inner shell and the inner actuator support member and is of a thickness to only occupy part of the spaces between the inner and outer shells and inner and outer actuator supportmore » members. The remaining portion of the space between the inner and outer shells and the space between the inner and outer members is substantially filled with a body of castable, rigid refractory material. A movable valve member is disposed in the inner shell. A valve actuator assembly is supported in the valve actuator support to extend into the inner shell for connection with the movable valve member for movement of the movable valve member to positions from a fully open to a fully closed position to control flow of fluid through the inner shell. An anchor means is disposed adjacent opposite sides of the axis of the valve actuator support and attached to the inner shell so that relative radial movement between the inner and outer shell is permitted by the layer of resilient heat insulating material and relative longitudinal movement of the inner shell to the outer shell is permitted in opposite directions from the anchor means to thereby maintain the functional integrity of the movable valve member by providing an area of the inner shell surrounding the movable valve member longitudinally stationary, but at the same time allowing radial movement. 4 figs.« less