# Here the parameter ? is the average number of neutrons released per ssion (mu). For a thermal water.

Here the parameter ν is the average number of neutrons

released per ssion (mu). For a thermal water reactor fueled with U-235, a

typical value of ν is 2.4. Using this parameter, estimate the effective

multiplication factor when there are only thermal neutrons in the core, and

then estimate the effective multiplication factor when there are both fast and

thermal neutrons in the core. What is the approximate difference (or percentage

error) between the two estimates in this case?

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Here the parameter ? is the average number of neutrons released per ssion (mu). For a thermal water.

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