Basic Test on Cooling Characteristics of JCO Precipitation Vessel using a Mock-up Device

摘要

This test concerns thermal characteristic of the JCO precipitation vessel, and aims at confirming evaporation effect and grasping behavior of solution temperature change. A mock-up device was manufactured, and cooling characteristick tests for plateau part in the accident were performed by changing the power of electric heaters based on the observed data of the JCO gamma-ray area monitory. Relation between equilibrium temperature and cooling-water flow rate for the observed initial power was measured. Significant amount of water evaporation and temperature change in the plateau part were measured, and the experimental condition was found having a possibility of giving a condition of the accident.