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Title: Nuclear reactor safety device

Abstract

A safety device is disclosed for use in a nuclear reactor for axially repositioning a control rod with respect to the reactor core in the event of an upward thermal excursion. Such safety device comprises a laminated helical ribbon configured as a tube-like helical coil having contiguous helical turns with slidably abutting edges. The helical coil is disclosed as a portion of a drive member connected axially to the control rod. The laminated ribbon is formed of outer and inner laminae. The material of the outer lamina has a greater thermal coefficient of expansion than the material of the inner lamina. In the event of an upward thermal excursion, the laminated helical coil curls inwardly to a smaller diameter. Such inward curling causes the total length of the helical coil to increase by a substantial increment, so that the control rod is axially repositioned by a corresponding amount to reduce the power output of the reactor.

Inventors:
 [1]
  1. (Wilmette, IL)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL
OSTI Identifier:
865840
Patent Number(s):
US 4587085
Assignee:
United States of America as represented by United States (Washington, DC) ANL
DOE Contract Number:
W-31109-ENG-38
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
nuclear; reactor; safety; device; disclosed; axially; repositioning; control; rod; respect; core; event; upward; thermal; excursion; comprises; laminated; helical; ribbon; configured; tube-like; coil; contiguous; slidably; abutting; edges; portion; drive; connected; formed; outer; inner; laminae; material; lamina; coefficient; expansion; curls; inwardly; diameter; inward; curling; causes; total; length; increase; substantial; increment; repositioned; corresponding; amount; reduce; power; output; reactor safety; safety device; power output; device comprises; control rod; nuclear reactor; reactor core; helical coil; thermal coefficient; helical ribbon; corresponding amount; /376/976/

Citation Formats

Hutter, Ernest. Nuclear reactor safety device. United States: N. p., 1986. Web.
Hutter, Ernest. Nuclear reactor safety device. United States.
Hutter, Ernest. 1986. "Nuclear reactor safety device". United States. doi:. https://www.osti.gov/servlets/purl/865840.
@article{osti_865840,
title = {Nuclear reactor safety device},
author = {Hutter, Ernest},
abstractNote = {A safety device is disclosed for use in a nuclear reactor for axially repositioning a control rod with respect to the reactor core in the event of an upward thermal excursion. Such safety device comprises a laminated helical ribbon configured as a tube-like helical coil having contiguous helical turns with slidably abutting edges. The helical coil is disclosed as a portion of a drive member connected axially to the control rod. The laminated ribbon is formed of outer and inner laminae. The material of the outer lamina has a greater thermal coefficient of expansion than the material of the inner lamina. In the event of an upward thermal excursion, the laminated helical coil curls inwardly to a smaller diameter. Such inward curling causes the total length of the helical coil to increase by a substantial increment, so that the control rod is axially repositioned by a corresponding amount to reduce the power output of the reactor.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1986,
month = 1
}

Patent:

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