Steam Generator Leak Rate Monitor
Monitoring steam generator leak rate in PWR nuclear power plants by measuring ¹⁶N activity
The SGLM 202K monitor forms part of the RAMSYS product line. It has been designed to detect and quantify leaks between the primary and the secondary circuits of a steam generator in a nuclear power plant. It operates on the principle that radioactive nitrogen (16N) produced in the reactor core during operation crosses into the secondary circuit through a steam generator tube crack (or hole). The 16N is carried away by the steam and is detected in the main steam line (MSL) outside containment.
For the SGLM 202K version: the NaI(TI) detector is enclosed inside a 2 π / 5 cm (2”) thick lead shielding to ensure protection against the ambient gamma background noise. This detector has no thermal insulation.
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