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VERSION:2.0
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SUMMARY:LRS² - Fanny Vitullo\, Statistical burnup distribution of moving 
 pebbles in HTR-PM reactor
DTSTART:20180718T110000
DTEND:20180718T120000
DTSTAMP:20260510T223920Z
UID:8f8e8505cf217d88bd81a6f6029372507e203eac4d1dff2a0ac68a45
CATEGORIES:Conferences - Seminars
DESCRIPTION:Fanny Vitullo\nLRS Lab Research Seminar\nSeason 2\n\nFanny Vit
 ullo\, Statistical burnup distribution of moving pebbles in HTR-PM reactor
 \n\nIn the pebble-bed high temperature reactor under construction in China
 \, called HTR-PM\, the spherical fuel elements continuously flow downward 
 in the cylindrical core. After the discharge\, the burnup of each pebble i
 s checked at the core outlet and\, according to the achieved burnup level\
 , the pebble might be disposed or reinserted into the upper section of the
  core\, distributing randomly in the radial direction and defining a varia
 ble number of passes necessary to achieve the average maximum burnup of 90
  MWd/kgU. Discrete Element Method (DEM) simulations have been carried out 
 to achieve a clear understanding of the movement of 420\,000 fuel pebbles 
 in the HTR-PM core. At the same time\, neutronic properties have been inve
 stigated for a single pebble and for the full core with Serpent 2 Monte Ca
 rlo code in order to perform a parametrization of the one-group microscopi
 c cross sections at the core-level. The pebble movement has been coupled w
 ith the neutronic behavior of a single pebble in a dedicated burnup script
  called Moving Pebble Burnup (MPB)\, developed in Matlab. 3\,000 single pe
 bble burnup histories were simulated to obtain sufficient statistics and i
 nsight on the burnup process in the HTR-PM. The decrease of the average bu
 rnup gained per single pass implies that a miss-handling of recirculated f
 uel elements is unlikely to lead to exceedance of the maximum allowed burn
 up of 100 MWd/kgU. Furthermore\, the core demonstrates a self-compensation
  effect of burnup\, meaning that it always compensates burnup under- or ov
 er-runs in the successive passes. Finally\, it is possible to conclude tha
 t the fuel cycle of the HTR-PM\, as it has been laid out\, is well-designe
 d and feasible.
LOCATION:PH L1 503 - Salle Aquarium https://plan.epfl.ch/?room=PHL1503
STATUS:CONFIRMED
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