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Title: Nuclear reactor safety device

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