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Title: Control rod driveline and grapple

Abstract

A control rod driveline and grapple is disclosed for placement between a control rod drive and a nuclear reactor control rod containing poison for parasitic neutron absorption required for reactor shutdown. The control rod is provided with an enlarged cylindrical handle which terminates in an upwardly extending rod to provide a grapple point for the driveline. The grapple mechanism includes a tension rod which receives the upwardly extending handle and is provided with a lower annular flange. A plurality of preferably six grapple segments surround and grip the control rod handle. Each grapple rod segment grips the flange on the tension rod at an interior upper annular indentation, bears against the enlarged cylindrical handle at an intermediate annulus and captures the upwardly flaring frustum shaped handle at a lower and complementary female segment. The tension rods and grapple segments are surrounded by and encased within a cylinder. The cylinder terminates immediately and outward extending annulus at the lower portion of the grapple segments. Excursion of the tension rod relative to the encasing cylinder causes rod release at the handle by permitting the grapple segments to pivot outwardly and about the annulus on the tension rod so as to open themore » lower defined frustum shaped annulus and drop the rod. Relative movement between the tension rod and cylinder can occur either due to electromagnetic release of the tension rod within defined limits of travel or differential thermal expansion as between the tension rod and cylinder as where the reactor exceeds design thermal limits.« less

Inventors:
 [1]
  1. San Jose, CA
Issue Date:
Research Org.:
General Electric Co., Boston, MA (United States)
OSTI Identifier:
866448
Patent Number(s):
4713210
Assignee:
General Electric Company (San Jose, CA)
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:  
AT03-76SF70030
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
control; rod; driveline; grapple; disclosed; placement; drive; nuclear; reactor; containing; poison; parasitic; neutron; absorption; required; shutdown; provided; enlarged; cylindrical; handle; terminates; upwardly; extending; provide; mechanism; tension; receives; annular; flange; plurality; preferably; six; segments; surround; grip; segment; grips; interior; upper; indentation; bears; intermediate; annulus; captures; flaring; frustum; shaped; complementary; female; rods; surrounded; encased; cylinder; immediately; outward; portion; excursion; relative; encasing; causes; release; permitting; pivot; outwardly; defined; drop; movement; occur; due; electromagnetic; limits; travel; differential; thermal; expansion; exceeds; design; upwardly extending; differential thermal; reactor control; rod drive; control rod; thermal expansion; nuclear reactor; reactor shutdown; relative movement; neutron absorption; rod release; extending annulus; rod driveline; segments surround; /376/294/976/

Citation Formats

Germer, John H. Control rod driveline and grapple. United States: N. p., 1987. Web.
Germer, John H. Control rod driveline and grapple. United States.
Germer, John H. Thu . "Control rod driveline and grapple". United States. https://www.osti.gov/servlets/purl/866448.
@article{osti_866448,
title = {Control rod driveline and grapple},
author = {Germer, John H},
abstractNote = {A control rod driveline and grapple is disclosed for placement between a control rod drive and a nuclear reactor control rod containing poison for parasitic neutron absorption required for reactor shutdown. The control rod is provided with an enlarged cylindrical handle which terminates in an upwardly extending rod to provide a grapple point for the driveline. The grapple mechanism includes a tension rod which receives the upwardly extending handle and is provided with a lower annular flange. A plurality of preferably six grapple segments surround and grip the control rod handle. Each grapple rod segment grips the flange on the tension rod at an interior upper annular indentation, bears against the enlarged cylindrical handle at an intermediate annulus and captures the upwardly flaring frustum shaped handle at a lower and complementary female segment. The tension rods and grapple segments are surrounded by and encased within a cylinder. The cylinder terminates immediately and outward extending annulus at the lower portion of the grapple segments. Excursion of the tension rod relative to the encasing cylinder causes rod release at the handle by permitting the grapple segments to pivot outwardly and about the annulus on the tension rod so as to open the lower defined frustum shaped annulus and drop the rod. Relative movement between the tension rod and cylinder can occur either due to electromagnetic release of the tension rod within defined limits of travel or differential thermal expansion as between the tension rod and cylinder as where the reactor exceeds design thermal limits.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {1}
}

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