Each SR / IR channel consists of:

• Wide range detector assembly (with integral cable)
• Junction box
• In-containment cable assembly (from junction box to inside penetration)
• Amplifier cable assembly (from outside penetration to amplifier)
• Amplifier assembly
• Combined (or separate) source and intermediate range rack mount signal processor(s)
• Shut down margin monitor

We have performed complete Neutron Flux Monitoring System upgrades, including portions of the Reactor Protection Systems, at several nuclear power plants. The upgrades provided new state-of-the-art Class 1E Safety-Related Source Range, Intermediate (or Wide) Range and Power Range Nuclear Instrument Systems, including detector, cable and electronic assemblies. The Neutron Flux Monitoring System has been designed for ease of installation, operation and maintenance. Its modularity allows easy installation, quick troubleshooting and repair.

The PR (power range) channel consists of:

• Power range detector assembly
• Power range amplifier assembly (optional)
• Power range monitor (in the NIS cabinet)

The power range detector assembly houses two guarded fission chambers (or uncompensated ion chambers). Stainless steel housing is provided to protect the chambers from the harsh environment and for ease of handling.

The amplifier assembly houses the power supplies and the electronics that condition the detector signal for transmission to the signal processor. The direct current supplies for the amplifier electronics and the high voltage supply for detector excitation are provided as part of the amplifier assembly to minimize the number of interconnecting wires and eliminate the hazard, voltage drop, or noise pick up associated with long power supply cables.

The power range monitors are provided in 19 inch rack mount enclosures with all of the required displays and outputs.