Nuclear Plant Journal, September-October 2015 NuclearPlantJournal.com
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operator based on locations of
the sensors and the available,
and applicable mitigation for the
risk conditions
HRMS monitoring elements consist
of in-containment Gas Monitoring Units
(GMU) with a paired Gas Monitoring
Unit Controller (GMUC), which is
mounted outside of containment,
and Outside Containment Hydrogen
Monitors (OCHM). HRMS integrates
the various sensor measurements in the
Signal Processing Unit (SPU), which
is located in the control room. The
SPU continuously scans, stores, and
displays real time conditions during
normal and SA conditions. The SPU
has unique capabilities to evaluate the
conditions and provide explosive risk
information to the operator through
its integrated local display and remote
displays. Pre-programmed into the SPU
are the appropriate mitigating actions
by location, which is displayed to the
operator. An event recorder is also
incorporated into HRMS so that it can
digitally store over 1 year of data from all
of the sensors.
Conclusion
The Fukushima SA showed that
a need exists for SA instrumentation.
GLSEQ undertook development of a
new advanced GLSEQ Severe Accident
(SA) Hydrogen Monitoring System,
which is part of the GLSEQ Intrinsically
Smart- Severe Accident Instrumentation
Line, designed to make nuclear plants
even safer. The R&D effort successfully
demonstrated performance of the
GLSEQ Hydrogen Sensors. The R&D
for this project was a part of the results
of the collaborative project by Japanese
electric power companies and plant
manufacturers that was carried out as the
Safety Enhancement for LWRs program
by Agency for Natural Resources and
Energy.
Contact: Jim Gleason, GLSEQ,
LLC, 120 Seven Cedars Dr., Huntsville,
AL 35802; telephone: (256) 369-8857,
email:
