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SUMMARY:Uncertainty Quantification in FPDH using 235U(nth\,f) and 239Pu(nt
 h\,f) JEFF-4 fission yield evaluations
DTSTART;VALUE=DATE-TIME:20260506T084000Z
DTEND;VALUE=DATE-TIME:20260506T092000Z
DTSTAMP;VALUE=DATE-TIME:20260514T132028Z
UID:indico-contribution-30544@indico.ific.uv.es
DESCRIPTION:Speakers: Oscar  Cabellos (Universidad Politécnica de Madrid\
 , Madrid)\nThis work investigates the impact of the JEFF-4.0 fission yield
  evaluation\, including associated uncertainties and covariance data on Fi
 ssion Pulse Decay Heat (FPDH).  Using thermal fission of ²³⁵U and ²³
 ⁹Pu as case studies\, uncertainty quantification is performed through a 
 Monte Carlo approach based on random sampling of correlated fission yield 
 datasets.\nCalculations of Fission Pulse Decay Heat (FPDH) are carried out
  using the ACAB code. The results show that the inclusion of fission yield
  correlations leads to a strong and systematic reduction of propagated unc
 ertainties\, both in short-term and long-term decay heat quantities.\nA de
 tailed analysis of decay chains and dominant contributors highlights the r
 ole of correlations—particularly negative correlations—in significantl
 y reducing variance. However\, the magnitude of this reduction raises ques
 tions about a possible underestimation of uncertainties when full covarian
 ce information is considered.\nThese findings emphasize the importance of 
 consistent and comprehensive covariance data in fission yield evaluations\
 , with direct implications for uncertainty propagation in reactor observab
 les and antineutrino spectrum predictions.\nIn addition\, calculations of 
 depletion-related isotopes (134Cs\, 135Xe and 149Sm) are carried out using
  the WIMSD5 codes for a typical 17x17 PWR fuel assembly as a function of t
 he burnup. The results show also a strong and systematic reduction of prop
 agated uncertainties.\n\nhttps://indico.ific.uv.es/event/8411/contribution
 s/30544/
LOCATION:Universe Salón de Actos del Edificio de Cabecera (PCUV) 
URL:https://indico.ific.uv.es/event/8411/contributions/30544/
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