Comparison of the Special Properties of Supercritical Water by Thermal and Cold Dynamic Neutron Radiography

Abstract

The supercritical-water-cooled reactor will work at high temperature and high pressure above the thermodynamic critical point of water. It is very important task to gain an understanding of the fluid mechanic behavior of the supercritical water. Dynamic neutron radiography is able to provide visual information about the motion of hydrogen containing materials (e.g. heavy and light water). A special sample holder family and a special measuring frame were developed at the Budapest research reactor to study the properties of water at high temperature and at high pressure by thermal neutrons. These investigations were extended using cold neutrons of FRM II. Some subtleties of water’s thermo-hydraulic behavior near the critical point were observed.