Development and substantiation of a method for safe use of hydrogen in the event of overheating of the working fuel in the steam turbine cycle of nuclear power plants

In the article, within the framework of solving the problem of providing NPPs with a base load due to combination with a hydrogen complex, a new principle of ensuring the safety of hydrogen use during overheating of the working fluid in the steam turbine cycle of NPPs is substantiated. For the first time, a system for removing unreacted hydrogen from the vapor phase of the working fluid of the steam turbine cycle of NPPs has been developed based on a catalytic hydrogen recombiner and magnetic separation with underground placement of the main equipment of the hydrogen complex. A detailed review is given on the experience of using catalytic recombiners in power engineering, as well as magnetic field technologies for gas separation and in obtaining hydrogen by water electrolysis, which proves the practical mastery of these technologies in the world. The principle of underground placement of the main equipment of the hydrogen complex is presented. A methodology for assessing the risk of fire and explosion of hydrogen when mixing with an oxidizer in the event of an emergency is given. Based on the developed system for removing unreacted hydrogen, new indicators have been obtained for reducing the likelihood of an explosion or fire when mixing hydrogen with an oxidizer. New results have been obtained for assessing the overall risk of explosion or fire when mixing hydrogen with an oxidizer in the event of an accident.

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