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Transient and load-following characteristics of a fully integrated single-cell thermionic fuel element

Journal Article · · Nuclear Technology; (United States)
OSTI ID:6540235
; ;  [1]
  1. Univ. of Mexico, Albuquerque (United States)
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A thermionic transient analyses model is developed to simulate transient and steady-state operations of a fully integrated, single-cell thermionic fuel element (TFE). The response of the TFE to a step input in reactivity and changes in the cesium pressure or in the size of the interelectrode gap, the coolant temperature, and the load demand are investigated. Also, the effects of these parameters on the load electric power, emitter temperature, overall conversion efficiency, and load following characteristics of the TFE are determined. Results show that although nuclear reactors having negative temperature reactivity coefficients are always load following, TFEs are only partially load following. For TFEs having a large interelectrode gap, it is desirable to conserve cesium by lowering its vapor pressure at the beginning of life since increasing the cesium pressure insignificantly affects the load electric power. However, should fuel swelling reduce the width of the interelectrode gap (after operating the reactor for an extended period of time), both the conversion efficiency and the load electric power will decrease. In this case, the load electric power could be restored by increasing the fission power and only partially by increasing the cesium vapor pressure.

OSTI ID:
6540235
Journal Information:
Nuclear Technology; (United States), Journal Name: Nuclear Technology; (United States) Vol. 102:2; ISSN 0029-5450; ISSN NUTYBB
Country of Publication:
United States
Language:
English

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21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210600* -- Power Reactors
Auxiliary
Mobile Package
& Transportable
ALKALI METALS
CESIUM
COMPUTERIZED SIMULATION
CONVERSION
COOLANTS
DIRECT ENERGY CONVERSION
EFFICIENCY
ELEMENTS
ENERGY CONVERSION
ENERGY EFFICIENCY
FUEL ELEMENTS
MATHEMATICAL MODELS
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NESDPS Office of Nuclear Energy Space and Defense Power Systems
OPERATION
PERFORMANCE
POWER REACTORS
REACTIVITY
REACTIVITY INSERTIONS
REACTOR COMPONENTS
REACTOR OPERATION
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SIMULATION
SPACE POWER REACTORS
STEADY-STATE CONDITIONS
SWELLING
THERMIONIC CONVERSION
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