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The paper discusses the basic design of the critical facility, whose main purpose is the physics validation of AHWR. Apart
from moderator level control, the facility will have shutdown systems based on shutoff rods and multiple ranges of neutron
detection systems. In addition, it will have a flux mapping system based on 25 fission chambers, distributed in the core.
We are planning to use this reactor for experiments with a suitable source to simulate an ADS system. Any desired sub-criticality
can be achieved by adjusting the moderator level. Apart from perfecting our experimental techniques, in simple configurations,
we intend to study the one-way coupled core in this facility. Preliminary calculations, employing a Monte Carlo code TRIPOLI,
are presented.
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In recent years, there has been an increasing worldwide interest in accelerator driven systems (ADS) due to their perceived
superior safety characteristics and their potential for burning actinides and long-lived fission products. Indian interest
in ADS has an additional dimension, which is related to our planned large-scale thorium utilization for future nuclear energy
generation.
The physics of ADS is quite different from that of critical reactors. As such, physics studies on ADS reactors are necessary
for gaining an understanding of these systems. Development of theoretical tools and experimental facilities for studying the
physics of ADS reactors constitute important aspect of the ADS development program at BARC. This includes computer codes for
burnup studies based on transport theory and Monte Carlo methods, codes for studying the kinetics of ADS and sub-critical
facilities driven by 14 MeV neutron generators for ADS experiments and development of sub-criticality measurement methods.
The paper discusses the physics issues specific to ADS reactors and presents the status of the reactor physics program and
some of the ADS concepts under study.
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