Traversing in-core probes for periodic calibration
Traversing In-Core Gamma & Neutron Probes (TIPs)
GE offers two types of Reuter Stokes traversing in-core probes (TIPs): the gamma TIP and the neutron TIP. TIP sensors are inserted in the calibration tube of the LPRM assemblies to perform periodic calibration of the four LPRM sensors.
- Reuter Stokes gamma and neutron TIP sensors that are movable DC ion chambers which measure gamma and neutron flux, respectively, at the elevation of each LPRM sensor
- Sensor operates in a neutron flux range from 1.5 E13 nv to 1.5 E14 nv, or from about 10 to 100 percent of the rated reactor power
- Both styles of TIP sensors are driven in or out of the calibration tube by a drive mechanism that engages a helical drive cable that forms the outer sheath of the sensor signal cable
- Between calibrations, the TIP sensor is withdrawn to a storage location outside primary containment
- Several LPRMs can be calibrated with a single TIP sensor that is guided to the LPRM calibration tubes with an indexing mechanism