Radiation protection protocol for environmental defense using nano-scopic water spray in nuclear accident

•New kind of radiation protection concept is introduced.•The shielding concept is accompanied with the water spray system.•Cheap and practical method is suggested.•The major impact is variable by the random emerging of fission products.

The environmental defense system in the nuclear power plants (NPPs) using water spray is investigated. A new kind of radiation protection system modeling is introduced in the case of NPPs accidents. The spray system is added to the conventional radiation protection barriers for the nuclear defense in depth concept where the water is considered as nano-scopic molecular substance. The effectiveness of aqueous solution is verified in a NPPs accident. The quantitative simulation for solubility of radioactive material is performed by the Monte-Carlo method, which is produced in the nuclear fuels. The safety concept is newly modified in the multiple barriers for the post accident. The cheap and simple system is suggested for the ecological safety in the NPPs accident as the political protocol.