Conceptual Design of a Two-Phase Flow Absorber System for Neutron Flux Regulation in a CANDU-PHW-1250 Reactor

Abstract

Improved spatial neutron flux control for future CANDU power reactors is becoming increasingly important. During the past five years, a Two-Phase Absorber Control (TOPAC) System has been under development at the Chalk River Nuclear Laboratories to meet these needs.

Only certain aspects of this conceptual design study are presented in the paper, such as

• - system controllability
• - in-reactor noise sensitivity
• - effect of equipment malfunctions on plant operation, and
• - a comparison with competing systems.

The TOPAC System is shown to be a viable alternative to existing and future neutron flux regulating systems based on liquid H₂0 zone compartments.