### Abstract

The topic of this paper is the development of sensitivity
and uncertainty analysis capability to the reactor
physics code CASMO-4 in the UAM (Uncertainty Analysis in
Best-Estimate Modelling for Design, Operation and Safety
Analysis of LWRs) benchmark. The developed calculation
system enables the uncertainty analysis of homogenized
multi-group cross-sections, diffusion coefficients and
pin powers with respect to nuclear data. The uncertainty
analysis methodology is deterministic, meaning that the
sensitivity profiles of the responses are computed first,
after which uncertainty is propagated by combining the
sensitivity profiles with the covariance matrices of the
uncertain nuclear data. The sensitivity analysis is based
on perturbation theory which enables computing the
sensitivity profiles efficiently by solving one
generalized adjoint system for each response. The
mathematical background of this work is reviewed and the
main conclusions related to the implementation are
summarized. Special emphasis is placed on the sensitivity
analysis of two-group homogenized diffusion coefficients
which require some modifications to the standard
equations of generalized perturbation theory. Numerical
results are presented and analyzed for a PWR fuel
assembly with control rods out and inserted. The
computational efficiency of the calculations is
discussed.

Original language | English |
---|---|

Title of host publication | Proceedings of the international conference on physics of reactors |

Subtitle of host publication | PHYSOR2014 |

Number of pages | 12 |

Volume | JAEA-Conf 2014-003 |

DOIs | |

Publication status | Published - 2015 |

MoE publication type | A4 Article in a conference publication |

Event | International Conference on the Physics of Reactors, PHYSOR 2014: The Role of Reactor Physics toward Sustainable Future - Kyoto, Japan Duration: 28 Sep 2014 → 3 Oct 2014 |

### Conference

Conference | International Conference on the Physics of Reactors, PHYSOR 2014 |
---|---|

Abbreviated title | PHYSOR2014 |

Country | Japan |

City | Kyoto |

Period | 28/09/14 → 3/10/14 |

## Fingerprint Dive into the research topics of 'Adjoint-based sensitivity and uncertainty analysis of lattice physics calculations with CASMO-4'. Together they form a unique fingerprint.

## Cite this

Pusa, M. (2015). Adjoint-based sensitivity and uncertainty analysis of lattice physics calculations with CASMO-4. In

*Proceedings of the international conference on physics of reactors: PHYSOR2014*(Vol. JAEA-Conf 2014-003). [1106024] https://doi.org/10.11484/jaea-conf-2014-003