![]() ![]() The fact causes this difference, and the deuterium nucleus is twice as heavy as the hydrogen nucleus. Pure heavy water (D 2O) has a density about 11% greater than water but is otherwise physically and chemically similar. Due to the different relative power of fuel assemblies in a core, these fuel assemblies have different hydraulic resistance and this may induce local lateral flow of primary coolant and it must be considered in thermal-hydraulic calculations. The pressure loss due to the coolant acceleration in an isolated fuel channel is then:
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