Abstract In this paper, an absolute measurements technique for the subcriticality determination is presented. The development of accelerator driven systems (ADS) requires the development of methods to monitor and control the subcriticality of this kind of system, without interfering with its normal operation mode. This method is based on the stochastic neutron and photon transport theory that can be implemented by presently available neutron transport codes. As a by-product of the methodology a monitoring measurement technique has been developed and verified using two coupled Monte Carlo programs. The first one, LAHET, simulates the spallation collisions and the high energy transport and the other, MCNPDSP, is used to estimate the counting statistics from neutron ray counter in fissile system, and the transport for neutrons with energies less than 20 Mev. Through the analysis of the counter detectors it is possible to determine the kinetics parameters and the k eff value. We present two different ways to obtain these parameters using the accelerator or using a Cf-252 source. A good agreement between theory and simulations has been obtained with both sources.
[1]
K. Behringer,et al.
On the problem of monitoring the neutron parameters of the fast energy amplifier
,
1999
.
[2]
Richard R. Spencer,et al.
A Measurement of the Average Number of Prompt Neutrons from Spontaneous Fission of Californium-252
,
1982
.
[3]
G. I. Bell,et al.
Nuclear Reactor Theory
,
1952
.
[4]
Y. Rugama,et al.
A stochastic transport theory of neutron and photon coupled fields
,
2000
.
[5]
J. Mihalczo.
The Use of Californium-252 as a Randomly Pulsed Neutron Source for Prompt-Neutron Decay Measurements
,
1974
.
[6]
G. I. Bell,et al.
On the Stochastic Theory of Neutron Transport
,
1965
.
[7]
Gumersindo Verdú,et al.
Stochastic neutron transport theory: Neutron counting statistics in nuclear assemblies
,
1987
.