ANALYSIS OF TIME-EIGENVALUE AND EIGENFUNCTIONS IN THE CROCUS BENCHMARK

Time-dependent neutron transport in non-critical state can be expressed by the natural mode equation. In order to estimate the dominant eigenvalue and eigenfunction of the natural mode, CEA had extended the α - k method and developed the generalized iterated fission probability method (G-IFP) in the...

Celý popis

Uložené v:
Podrobná bibliografia
Vydané v:EPJ Web of Conferences Ročník 247; s. 04011
Hlavní autori: Nauchi, Yasushi, Jinaphanh, Alexis, Zoia, Andrea
Médium: Journal Article
Jazyk:English
Japanese
Vydavateľské údaje: EDP Sciences 01.01.2021
Predmet:
continuous-energy
crocus
generalized iterated fission probability
monte carlo
natural mode equation
Physics
QC1-999
time-dependent
ISSN:2100-014X, 2100-014X
On-line prístup:Získať plný text
Tagy: Pridať tag
Žiadne tagy, Buďte prvý, kto otaguje tento záznam!
Popis
Shrnutí:Time-dependent neutron transport in non-critical state can be expressed by the natural mode equation. In order to estimate the dominant eigenvalue and eigenfunction of the natural mode, CEA had extended the α - k method and developed the generalized iterated fission probability method (G-IFP) in the TRIPOLI-4® code. CRIEPI has chosen to compute those quantities by a time-dependent neutron transport calculation, and has thus developed a time-dependent neutron transport technique based on k -power iteration (TDPI) in MCNP-5. In this work, we compare the two approaches by computing the dominant eigenvalue and the direct and adjoint eigenfunctions for the CROCUS benchmark. The model has previously been qualified for keff s and kinetic parameters by TRIPOLI-4 and MCNP-5. The eigenvalues of the natural mode equations by α - k and TDPI are in good agreement with each other, and closely follow those predicted by the inhour equation. Neutron spectra and spatial distributions (flux and fission neutron emission) obtained by the two methods are also in good agreement. Similar results are also obtained for the adjoint fundamental eigenfunctions. These findings substantiate the coherence of both calculation strategies for natural mode.
ISSN:2100-014X
2100-014X
DOI:10.1051/epjconf/202124704011