Transport theory calculation for a heterogeneous multi-assembly problem bycharacteristics method with direct neutron path linking technique

Authors
Citation
S. Kosaka et E. Saji, Transport theory calculation for a heterogeneous multi-assembly problem bycharacteristics method with direct neutron path linking technique, J NUC SCI T, 37(12), 2000, pp. 1015-1023
Citations number
10
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Nuclear Emgineering
Journal title
JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY
ISSN journal
0022-3131 → ACNP
Volume
37
Issue
12
Year of publication
2000
Pages
1015 - 1023
Database
ISI
SICI code
0022-3131(200012)37:12<1015:TTCFAH>2.0.ZU;2-H
Abstract
A characteristics transport theory code, CHAPLET, has been developed for th e purpose of making it practical to perform a whole LT LWR core calculation with the same level of calculational model and accuracy as that of an ordi nary single assembly calculation. The characteristics routine employs the C ACTUS algorithm for drawing ray tracing lines, which assists the two key fe atures of the flux solution in the CHAPLET code. One is the direct neutron path linking (DNPL) technique which strictly connects angular fluxes at eac h assembly interface in the flux solution separated between assemblies. Ano ther is to reduce the required memory storage by sharing the data related t o ray tracing among assemblies with the same configuration. For faster comp utation, the coarse mesh rebalance (CMR) method and the Aitken method were incorporated in the code and the combined use of both methods showed the mo st promising acceleration performance among the trials. In addition, the pa rallelization of the Bur solution was attempted, resulting in a significant reduction in the wall-clock time of the calculation. By all these efforts, coupled with the results of many verification studies, a whole LWR core he terogeneous transport theory calculation finally became practical. CHAPLET is thought to be a useful tool which can produce the reference solutions fo r analyses of an LWR core.