SYMPOSIA PAPER Published: 01 January 2001

A System Design for Measuring Boron Concentration in Pressurized Light Water Reactor Cooling Water


A new technique has been proposed for measurement of the boron concentration in primary cooling water in Pressurized Light Water Reactors (PLWRs). This designed system consists of two types of photon detectors and a compact external neutron source. The boron concentration is, in principle, determined by the count rule of 0.48 MeV prompt γ-rays emitted after 10B(n,α)7Li* reactions induced by thermal neutron irradiation, diving by that of 2.2 MeV capture γ-rays from 1H(n,γ) reactions. In the first design, a cadmium zinc telluride (CZT) semiconductor and a bismuth germante (BGO) scintillator were selected as promising detectors and their response functions were evaluated by Monte Carlo calculations. Pulse height distributions have been simulated considering the background photons emitted from a neutron source and radioactive impurities in cooling water. The error in evaluating the boron concentration was also estimated; for example, the concentration of 100 ppm with 1% error might be measured within 20 seconds in a thermal neutron field of 5×104 cm-2s-1.

Author Information

Oda, K
Kobe University of Mercantile Marine, Kobe, Japan
Kojima, T
Kobe University of Mercantile Marine, Kobe, Japan
Nakagawa, K
Kobe University of Mercantile Marine, Kobe, Japan
Yamauchi, T
Kobe University of Mercantile Marine, Kobe, Japan
Ohashi, S
Kansai Electric Power Co., Inc., Osaka, Japan
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Developed by Committee: E10
Pages: 819–826
DOI: 10.1520/STP13675S
ISBN-EB: 978-0-8031-5450-6
ISBN-13: 978-0-8031-2884-2