A comparative study of reactivity feedback effects for a HALEU molybdenum-producing PHWR fuel bundle and a standard PHWR fuel bundle

Haroon, Jawad; Nichita, Eleodor

doi:10.1016/j.nucengdes.2020.110545

Cited by 2 publications

(2 citation statements)

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“…The fuel temperatures in each discrete region of the pin are set, for each bundle type, according to the calculated radial temperature profiles in Ref. 4 given at zero burnup or 20-day burnup. The radial temperature profile for the MPB is significantly different from that for the SCB (Ref.…”

Section: Vb Detailed Bundle Modelmentioning

confidence: 99%

“…The study concluded that the reactivities, bundle-averaged twogroup homogenized cross sections and reaction rates at the fuel pin level during normal, steady-state, operation are quasi-identical for the MPB and the SCB. A separate comparative study of the reactivity feedback effects of the two fuel bundles 4 concluded that they have almost identical reactivity feedback effects for coolant density, moderator density, coolant temperature, moderator temperature, fuel temperature and moderator poison concentration.…”

Section: Introductionmentioning

confidence: 99%

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PHWR Reactivity Device Incremental Macroscopic Cross Sections and Reactivities for a Molybdenum-Producing Bundle and a Standard Bundle

Haroon

Nichita

2021

Nuclear Technology

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A new 37-element PHWR fuel bundle, designed for molybdenum-99 production, has been proposed previously. The new bundle has been shown to have lattice properties and reactivity feedback effects equivalent to the standard PHWR bundle. This study looks at the effect the use of molybdenum-99-producing bundles has on the reactivity worth of reactivity devices, through the prism of reactivity-device macroscopic-cross-section increments. The study utilizes three-dimensional supercell configurations and the neutron transport code DRAGON to calculate and compare the incremental macroscopic cross sections and supercell reactivity for adjuster absorbers, shutoff absorber rods and liquid zone controllers when surrounded by molybdenum-99-producing bundles and by regular bundles. Two geometrical representations of fuel bundles are used: a detailed, cluster, representation, whereby all fuel pins are modeled separately, and an annularized representation, whereby each ring of fuel pins and corresponding coolant is represented as a homogeneous annulus. The latter model is the one customarily used in production calculations for finding cross-section increments of reactivity devices.The study finds that reactivity-device cross-section and supercell reactivity increments are very similar (< 2% difference in reactivity increments) for the case of the molybdenum-producing bundle and the regular bundle. The study also finds that the use of a detailed, cluster, geometrical representation of the fuel bundle produces slightly different cross-section increments and supercell reactivity increments than the use of an annularized geometrical representation. The supercell reactivity-increment difference between the two representations is found to be ~8.0% for adjuster absorbers and ~11.0% for shutoff absorber rods.

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Section: Vb Detailed Bundle Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%