MONITOR FOR MATERIAL IN REACTOR

PURPOSE:To monitor the deterioration on ageing of the structural material in an atomic reactor by using a mechanism with the strain increasing in accordance with the operating time of the reactor in the loading system of a test piece container. CONSTITUTION:The pellets 2a-2f obtained by sintering a...

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Bibliographic Details
Main Author YAMAMOTO MICHIYOSHI
Format Patent
LanguageEnglish
Published 16.11.1990
Subjects
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
NUCLEAR ENGINEERING
NUCLEAR PHYSICS
NUCLEAR REACTORS
PHYSICS
TESTING
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Summary:PURPOSE:To monitor the deterioration on ageing of the structural material in an atomic reactor by using a mechanism with the strain increasing in accordance with the operating time of the reactor in the loading system of a test piece container. CONSTITUTION:The pellets 2a-2f obtained by sintering a mixture of Al2O3 and B4C are enclosed in the test piece container 1 made of stainless steel, and a current from a DC power source 6 is intermittently switched by a current polarity switching device and supplied to the feeder terminals 8a and 8b of the container 1 through a lead wire 7. The measuring terminals 3 connected to a multiplexer through a lead wire 4 are switched by the potential difference, and the potential difference is measured by micropotentiometers 5a-5f. When the internal stress in the container 1 is gradually increased by the cubic expansion of the pellets of the mixed powder of Al2O3 and B4C in the container 1 in the atomic reactor and generation of gaseous H2, the material of the container 1 is progressively deteriorated in the process of operation by the thermal stress. Consequently, the state can be measured and monitored with the lapse of time.
Bibliography:Application Number: JP19890100151