IMAS-H2: Monitoring of H2-accumulation
Major task of the system
Detection of local H2-accumulations in boiling water reactors (BWRs).
Scheme and function
- monitoring of temperatures at selected points of steam lines
- temperature monitoring using 2 totally independent measurement systems
- 3rd system checks function of the 2 monitoring systems
- if limit is exceeded an alarm is sent to plant control room
- quick-look evaluation of data in control room
- measures determined on the basis of this quick-look evaluation
Highlights
- two totally independent measurement chains
- two totally independent measurement systems
- two totally independent power supplies
- additional check of the monitoring systems by a 3rd system
- hard- and software function control by internal and external watchdog
- local and central data storage
- alarm output in case of violation of limits
- alarm output in case of hardware defect
- alarm at the I&C cabinet and at the control room
- visual check of the measured data in case of an alarm
