Thermo-fluid analysis for nuclear fuel reprocessing plant

In order to evaluate a confinement of radioactive materials in the event of fire, explosion and criticality as DBA in the reprocessing plant, it is necessarily to obtain transport phenomena of burning materials containing radioactive aerosols due to thermo-fluid flows in the network of ventilation system of the plant. Computer codes of one, two and three-dimensional thermo-fluid analyses have been made in JAERI for fire and explosion accidents under the entrustment by the Science and Technology Agency. These codes can be calculated not only the thermo-fluid analysis for pressure, temperature and velocity in the network of cells and ducts but also generation of radioactive materials from a accident source, transport and deposition of radioactive aerosols, integrity of HEPA filter, and release of radioactive materials to environment. Results by these codes are compared now with those of large-scale demonstration tests simulated to fire and explosion accidents in the reprocessing plant. (author)