Argonne National Laboratory
RERTR
Reduced Enrichment for Research and Test Reactors
Nuclear Engineering Division at Argonne
U.S. Department of Energy

Analysis Methods for Thermal Research and Test Reactors

HE-3 AND LI-6 POISONING OF THE MARIA REACTOR BERYLLIUM MATRIX

Teresa Kulikowska, Krzysztof Andrzejewski
Institute of Atomic Energy, Swierk, Poland


Manuel M. Bretscher
Argonne National Laboratory, USA

Abstract

This report discusses methods used to evaluate 6Li and 3He poison concentrations, initiated by the 9Be(n,a ) reaction, in the beryllium blocks of the MARIA reactor. The results are based on ENDF/B-VI neutron cross sections, 3D diffusion neutron fluxes, and solutions to the differential equations which describe the time-dependent poison concentrations as function of reactor operation and shutdown periods. MCNP Monte Carlo calculations were used to verify calculated poison levels for observed critical configurations. Previous evaluations used somewhat less refined methods based on asymptotic solutions for the poison concentrations. It was found that 3He and 6Li in the beryllium blocks limit the available excess reactivities and alter flux and power distributions. Based on analyses of critical cores, it was determined that poison concentrations need be evaluated for only an in-core region and for an ex-core region and not for each beryllium block.


PDF version available
This document is available in PDF format.

DOWNLOAD full paper in PDF format.


Contact:
Teresa Kulikowska
Institute of Atomic Energy,
05-400 Otwock-Swierk,
Poland

Email: e02kul@cx1.cyf.gov.pl

2016 RERTR Meeting

The 2016 International RERTR Meeting (RERTR-2016) will take place in Belgium. Stay tuned for further details.

2015 RERTR Meeting

The 2015 International RERTR Meeting (RERTR-2015) took place in Seoul, Korea on Oct. 11-14, 2015.
For more information visit RERTR-2015.

Useful Links

DOCUMENTS


ARGONNE NATIONAL LABORATORY, Nuclear Engineering Division, RERTR Department
9700 South Cass Ave., Argonne, IL 60439-4814
A U.S. Department of Energy laboratory managed by UChicago Argonne, LLC
 

Last modified on July 29, 2008 11:32 +0200