Westinghouse Electric Co. signed an agreement with Siempelkamp Nukleartechnik GmbH (SNT) subsidiaries Siempelkamp Nuclear Services Inc (SNS) and NIS Ingenieurgesellschaft mbH (NIS) to jointly market and provide Passive Autocatalytic Recombiner (NIS-PAR) technology and analysis to the nuclear industry in the U.S. and worldwide.
Westinghouse will perform the design and analysis of the hydrogen control system using codes like MAAP and MELCOR to predict the generation and transport of hydrogen for severe accident scenarios and the number of NIS-PARs needed to preclude hydrogen detonation. Under terms of the agreement, Siempelkamp will provide joint marketing support, the NIS-PAR devices, test and cleaning devices, as well as needed supports for mounting the devices.
The NIS-PAR technology uses hydrogen recombination to prevent the buildup of hydrogen gas or other flammable gases like carbon monoxide that can collect and create an explosive atmosphere. The function is completely passive and self-starting at low temperatures and in steam environments. It is driven by natural convection generated by the heat from the hydrogen recombination. Each NIS-PAR has a hood to protect against containment spray. A great number of international test programs were conducted with the NIS-PAR module that verifies operability under accident conditions. A great variety of NIS-PAR device options allows the flexible adaption to the plant-specific needs and for the needed depletion rates in the nuclear power plant containment, auxiliary building or spent fuel pool locations. In addition, NIS-PAR allows for the periodic testing and cleaning of cartridges should they be exposed to contaminants.
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