Electric heater for nuclear fuel rod simulators
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.
- Assignee:
- Dept. Of Energy
- Patent Number(s):
- US 4326122
- Application Number:
- TRN: 82-018874
- OSTI ID:
- 5195136
- Resource Relation:
- Patent File Date: Filed date 14 Jul 1980; Other Information: PAT-APPL-168977
- Country of Publication:
- United States
- Language:
- English
Similar Records
Boron nitride insulating material
Boron nitride insulating material
Related Subjects
FUEL RODS
SIMULATORS
BORON NITRIDES
ELECTRICAL INSULATION
HEATERS
HELICAL CONFIGURATION
MAGNESIUM COMPOUNDS
PARTICLES
STAINLESS STEELS
TESTING
THERMAL CONDUCTIVITY
ZIRCALOY
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
ANALOG SYSTEMS
BORON COMPOUNDS
CHROMIUM ALLOYS
CONFIGURATION
CORROSION RESISTANT ALLOYS
FUEL ELEMENTS
FUNCTIONAL MODELS
IRON ALLOYS
IRON BASE ALLOYS
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
REACTOR COMPONENTS
STEELS
THERMODYNAMIC PROPERTIES
TIN ALLOYS
ZIRCONIUM ALLOYS
ZIRCONIUM BASE ALLOYS
220600* - Nuclear Reactor Technology- Research
Test & Experimental Reactors