![]() The weighting factor thus defines how much of the fission power (and possibly gamma heating) from a neutronic volume contributes to the heat generated in a given thermal-hydraulic volume. The sum of the weighting factors of the neutronic volumes contributing to a given thermal-hydraulic volume should be equal to unity. The relative weight of a neutronic volume to a thermal-hydraulic volume for the neutronic to thermal-hydraulic coupling. The weighting factor thus defines how much of the fuel temperature and the moderator temperature and/or density from a thermal-hydraulic volume should be used for retrieving the corresponding nuclear material data for a given neutronic volume. The sum of the weighting factors of the thermal-hydraulic volumes contributing to a given neutronic volume should be equal to unity. The relative weight of a thermal-hydraulic volume contributing to a neutronic volume for the thermal-hydraulic to neutronic coupling. A coupling coefficient can be seen as follows:
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