Abstract
The overall temperature coefficient of reactivity of VHTRC-1 core was measured at the Very High Temperature Reactor Critical Assembly (VHTRC) to examine the calculation accuracy of temperature dependent neutronic characteristics of the High Temperature Engineering Test Reactor (HTTR). The core of VHTRC consists of pin-in-block type fuel using coated particles of low-enriched UO2. The whole assembly was heated by electric heaters and the reactivity change due to the temperature rise up to 200°C was measured by the pulsed neutron method to determine the overall temperature coefficient of reactivity in isothermal condition. The experimental results indicated that the temperature coefficient was −1.71 × 10−4 Δk/k/°C on the average in the measured range from 25 to 200°C and the absolute value was smaller by 20% near room temperature than at the higher temperature. The calculation by the SRAC code system using the ENDF/B-IV nuclear data well predicted the experimental results.
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