Development of fire and explosion analysis code system -P2A- for HTGR hydrogen production system. Contact research

One of the most important safety design issues for a High Temperature Gas-cooled Reactor (HTGR) hydrogen production system is to ensure reactor safety against fire and explosion accidents in the hydrogen production plant because a large amount of combustible fluid is dealt with in the hydrogen production system. The Japan Atomic Energy Research Institute has the demonstration test plan to connect the hydrogen production system by steam reforming of methane gas with the High Temperature engineering Test Reactor (HTTR). In the plan, we considered effective measures against the fire and explosion accidents in the HTTR hydrogen production system, which were applicable to the HTGR hydrogen production system of a commercial base, and also developed the P2A code system to analyze event sequences and consequences in detail, on assumed fire and explosion accidents in the HTGR hydrogen production system and the HTTR hydrogen production system. It is possible that the P2A analyzed the process of leakage, dispersion, ignition, and combustion including deflagration and detonation of the combustible fluid in the internal and external area of the reactor building. In this report, we describe the facilities and the events that are analyzed by the P2A, the outline and the usage of the P2A, and the results of preliminary calculations. (author)