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In pressurized water reactors (PWRs), including Russian-type reactors, slow changes in reactivity are controlled using boric acid dissolved in the coolant of the primary circuit. Dissolved boric acid is also one of the solutions used by the nuclear industry to prevent any criticality events in spent fuel pools. Today it is still standard practice to measure boric acid concentration on a non-continuous basis via chemical analysis for those usages (titration).

Continuous Measurement of Boron Concentration allows the early detection of disturbances on an almost real-time basis.
The measuring principle is based on the absorption of neutrons by the isotope B-10, which depends on the boron content of the coolant. Neutrons from an Am-Be source diffuse through the coolant and a portion of these neutrons is absorbed. The remaining neutron radiation is then detected by suitably positioned counter tubes.

For signal acquisition and processing TELEPERM XS – Framatome’s instrumentation and control platform for safety-related applications – is used.

Your Benefits

  • Early detection of disturbances in the boric acid concentration within the primary circuit and the fuel pool cooling system up to medium temperatures of 200°C
  • Rapid qualitative measurement within seconds
  • A fully qualified system for safety-related applications
  • Optimized installation of the equipment and systems in the plant with no welding intervention on pipes and easy integration in an expert system to support plant chemistry
  • Easy service and maintenance by means of automatic diagnostics of all components

Interested in Continuous Measurement of Boron Concentration – COMBO?

CANDU Reactors VVER Reactors CANDO VVER Westinghouse