Fissionproductyields(FY)arefundamentalnucleardataforseveralapplications,includingdecay heat, shielding, dosimetry, burn-up calculations. To be safe and sustainable, modern and future nuclear systems require accurate knowledge on reactor parameters, with reduced margins of uncertainty. Present nuclear data libraries for FY do not provide consistent and complete uncertainty information which are limited, in many cases, to only variances. In the present work we propose a methodology to evaluate covariance matrices for thermal and fast neutron induced fission yields. The semi-empirical models adopted to evaluate the JEFF-3.1.1 FY library have been used in the Generalized Least Square Method available in CONRAD (COde for Nuclear Reaction Analysis and Data assimilation) to generate covariance matrices for several fissioning systems such as the thermal fission of U235, Pu239 and Pu241 and the fast fission of U238, Pu239 and Pu240. The impact of such covariances on nuclear applications has been estimated using deterministic and Monte Carlo uncertainty propagation techniques. We studied the effects on decay heat and reactivity loss uncertainty estimation for simplified test case geometries, such as PWR and SFR pin-cells. The impact on existing nuclear reactors, such as the Jules Horowitz Reactor under construction at CEA-Cadarache, has also been considered.

Covariance generation and uncertainty propagation for thermal and fast neutron induced fission yields / Terranova, N.; Serot, O.; Archier, P.; Nullc, nullDe Saint Jean; Sumini, M.. - In: EPJ WEB OF CONFERENCES. - ISSN 2101-6275. - ELETTRONICO. - 146:(2017), pp. 02013-1-02013-3. (Intervento presentato al convegno ND 2016: International Conference on Nuclear Data for Science and Technology tenutosi a Bruges nel September 11–16, 2016) [10.1051/epjconf/201714602013].

Covariance generation and uncertainty propagation for thermal and fast neutron induced fission yields

TERRANOVA, NICHOLAS;SUMINI, MARCO
2017

Abstract

Fissionproductyields(FY)arefundamentalnucleardataforseveralapplications,includingdecay heat, shielding, dosimetry, burn-up calculations. To be safe and sustainable, modern and future nuclear systems require accurate knowledge on reactor parameters, with reduced margins of uncertainty. Present nuclear data libraries for FY do not provide consistent and complete uncertainty information which are limited, in many cases, to only variances. In the present work we propose a methodology to evaluate covariance matrices for thermal and fast neutron induced fission yields. The semi-empirical models adopted to evaluate the JEFF-3.1.1 FY library have been used in the Generalized Least Square Method available in CONRAD (COde for Nuclear Reaction Analysis and Data assimilation) to generate covariance matrices for several fissioning systems such as the thermal fission of U235, Pu239 and Pu241 and the fast fission of U238, Pu239 and Pu240. The impact of such covariances on nuclear applications has been estimated using deterministic and Monte Carlo uncertainty propagation techniques. We studied the effects on decay heat and reactivity loss uncertainty estimation for simplified test case geometries, such as PWR and SFR pin-cells. The impact on existing nuclear reactors, such as the Jules Horowitz Reactor under construction at CEA-Cadarache, has also been considered.
2017
ND 2016: International Conference on Nuclear Data for Science and Technology
02013-1
02013-3
Covariance generation and uncertainty propagation for thermal and fast neutron induced fission yields / Terranova, N.; Serot, O.; Archier, P.; Nullc, nullDe Saint Jean; Sumini, M.. - In: EPJ WEB OF CONFERENCES. - ISSN 2101-6275. - ELETTRONICO. - 146:(2017), pp. 02013-1-02013-3. (Intervento presentato al convegno ND 2016: International Conference on Nuclear Data for Science and Technology tenutosi a Bruges nel September 11–16, 2016) [10.1051/epjconf/201714602013].
Terranova, N.; Serot, O.; Archier, P.; Nullc, nullDe Saint Jean; Sumini, M.
File in questo prodotto:
Eventuali allegati, non sono esposti

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/609681
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 1
social impact