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A 16N/19O Monitor for Leak Detection in a Steam Generator
Volume 155 · Number 3 · September 2006 · Pages 350-357
Technical Paper · Nuclear Plant Operations and Control
Shengyao Ding, Kun Xu, Xiaojian Huang, Zheng Wang
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This paper describes a new system for monitoring leaks in a steam generator. The new system extends the traditional 16N monitor to detect both the rate and the location of a leak. Because the transit time is different for radioactive 16N and 19O to travel from the reactor core via the hot bottom side, cold bottom side, or bend region of the U-tube in a steam generator to the gamma-ray detector, the new system uses the different transit times to identify the location of leaks. Specifically, the ratio S0 of 16N to 19O activities in the reactor core of a swimming pool reactor was calculated by combining the cross sections  np(E) and n (E) with the neutron spectra  n(E). The ratio S1 of 16N to 19O activities in the measurement room was also calculated and measured by the high-purity germanium and NaI(Tl) detectors. The result of the calculation agrees with the measurement within an acceptable range.
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