H2/O2 Hydrogen/Oxygen Gas Monitoring Analyzers for Nuclear Applications from Meggitt Safety Systems - smart engineering for extreme environments

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Meggitt Safety Systems

CAMS Analyzers for the Amended Rule, Notes

Although procurement of new systems may now consider good quality commercial equipment, both the hydrogen and oxygen analyzers must function correctly post accident and therefore be compatible with post-accident conditions. Key concerns to ensure functionality are to verify sample-wetted materials, materials in contact with containment atmosphere, are selected from the list of materials previously proven to be compatible with predicted post accident sample conditions. Those conditions include steam, high levels of radiation and rapid changes in temperature and pressure.

Formal environmental qualification is not required for the hydrogen analyzer and is being questioned for the oxygen analyzer. Regardless of the outcome of the discussion, the equivalent of environmental qualification per 1.89 is needed to provide evidence that critical analyzer components (the sensors and non metallic materials as noted above) in contact with containment atmosphere can withstand the harsh post accident conditions.

An additional consideration is that the system’s pressure retaining components must continue to meet current regulations imposed on containment penetrations. More specifically, pressure retaining welds be thoroughly examined and the application of non-metallic materials as pressure retaining seals (as noted above) be compatible with post accident conditions.