Fast Spectrum Reactors by Alan E. Waltar, Donald R. Todd, Pavel V. Tsvetkov

By Alan E. Waltar, Donald R. Todd, Pavel V. Tsvetkov

With a special concentrate on the services of speedy spectrum reactors to handle nuclear waste transmutation concerns, this publication describes how briskly spectrum reactors give a contribution to the worldwide nuclear renaissance whereas minimizing nuclear proliferation matters.

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2b, with blanket assemblies at the center and in concentric rings. 2. The core of a fast reactor is smaller than that of a thermal reactor of comparable power. A thermal reactor is optimized at some particular fuel-to-moderator ratio, and any core smaller than optimum represents a less economic configuration. For a fast reactor, there are great incentives to minimize the size of the core, both for neutronics and cost considerations. No moderator is needed; in fact, a moderator is normally excluded by design in order to maintain a hard spectrum.

13) more precise, but the sensitivity of the doubling time to the breeding gain and fissile specific inventory is readily apparent. 4 results in a factor-of-two reduction in doubling time. The fissile specific inventory for a fast spectrum reactor with oxide fuel is in the range of 1–2 kg/MWth. 13) can also be used to estimate doubling times for thermal breeders. Two thermal breeder designs have received considerable development—the light water seed-and-blanket breeder and the molten salt breeder.

A thermal reactor is optimized at some particular fuel-to-moderator ratio, and any core smaller than optimum represents a less economic configuration. For a fast reactor, there are great incentives to minimize the size of the core, both for neutronics and cost considerations. No moderator is needed; in fact, a moderator is normally excluded by design in order to maintain a hard spectrum. By squeezing out as much coolant and structural material as possible to increase the fuel volume fraction, the neutron leakage is decreased, and the fissile fraction can be decreased.

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