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Title: Electric heater for nuclear fuel rod simulators

Abstract

The present invention is directed to an electric cartridge-type heater for use as a simulator for a nuclear fuel pin in reactor studies. The heater comprises an elongated cylindrical housing containing a longitudinally extending helically wound heating element with the heating element radially inwardly separated from the housing. Crushed cold-pressed preforms of boron nitride electrically insulate the heating element from the housing while providing good thermal conductivity. Crushed cold-pressed preforms of magnesia or a magnesia-15 percent boron nitride mixture are disposed in the cavity of the helical heating element. The coefficient of thermal expansion of the magnesia or the magnesia-boron nitride mixture is higher than that of the boron nitride disposed about the heating element for urging the boron nitride radially outwardly against the housing during elevated temperatures to assure adequate thermal contact between the housing and the boron nitride.

Inventors:
 [1];  [2];  [3]
  1. (Knoxville, TN)
  2. (Oak Ridge, TN)
  3. (Concord, TN)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
864185
Patent Number(s):
4326122
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
electric; heater; nuclear; fuel; rod; simulators; directed; cartridge-type; simulator; reactor; studies; comprises; elongated; cylindrical; housing; containing; longitudinally; extending; helically; wound; heating; element; radially; inwardly; separated; crushed; cold-pressed; preforms; boron; nitride; electrically; insulate; providing; thermal; conductivity; magnesia; magnesia-15; percent; mixture; disposed; cavity; helical; coefficient; expansion; magnesia-boron; urging; outwardly; elevated; temperatures; assure; adequate; contact; radially inward; radially inwardly; cylindrical housing; heating element; elevated temperatures; thermal conductivity; boron nitride; thermal expansion; nuclear fuel; elevated temperature; fuel rod; longitudinally extending; radially outwardly; radially outward; thermal contact; housing containing; electric heater; electric heat; reactor studies; percent boron; elongated cylindrical; type heat; helically wound; wound heat; electrically insulate; /219/29/338/376/976/

Citation Formats

McCulloch, Reginald W., Morgan, Jr., Chester S., and Dial, Ralph E. Electric heater for nuclear fuel rod simulators. United States: N. p., 1982. Web.
McCulloch, Reginald W., Morgan, Jr., Chester S., & Dial, Ralph E. Electric heater for nuclear fuel rod simulators. United States.
McCulloch, Reginald W., Morgan, Jr., Chester S., and Dial, Ralph E. Fri . "Electric heater for nuclear fuel rod simulators". United States. https://www.osti.gov/servlets/purl/864185.
@article{osti_864185,
title = {Electric heater for nuclear fuel rod simulators},
author = {McCulloch, Reginald W. and Morgan, Jr., Chester S. and Dial, Ralph E.},
abstractNote = {The present invention is directed to an electric cartridge-type heater for use as a simulator for a nuclear fuel pin in reactor studies. The heater comprises an elongated cylindrical housing containing a longitudinally extending helically wound heating element with the heating element radially inwardly separated from the housing. Crushed cold-pressed preforms of boron nitride electrically insulate the heating element from the housing while providing good thermal conductivity. Crushed cold-pressed preforms of magnesia or a magnesia-15 percent boron nitride mixture are disposed in the cavity of the helical heating element. The coefficient of thermal expansion of the magnesia or the magnesia-boron nitride mixture is higher than that of the boron nitride disposed about the heating element for urging the boron nitride radially outwardly against the housing during elevated temperatures to assure adequate thermal contact between the housing and the boron nitride.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {1}
}

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