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产品类别- 核反应堆检测系统 >>中子通量监控系统 >>
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Wide Range Neutron Flux Monitoring System
From cold shutdown to 200 percent of reactor power, the Thermo Scientific Wide Range System reliably and accurately measures neutron flux level. The Wide Range Channel replaces both Source and Intermediate Range channels of your older reactor instrumentation. The electronics contain no high voltage, coaxial or triaxial cable in the control room.
The Thermo Scientific Wide Range Channel provides neutron flux measurement from reactor shutdown to reactor full power level or from 10-2 nv to 1010 nv in a harsh environment. It is designed to measure neutron flux with the detector in a high gamma radiation and electrical noise environment. The system is designed to operate for 40 years under normal conditions and to survive a design basis event (DBE) providing reliable measurement before, during and after the DBE.

This fission chamber based neutron flux monitoring system has a 40-year qualified life and has been completely qualified for 1E Safety-Related applications and satisfies U.S. NRC Regulatory Guide 1.97 Post Accident Monitoring Requirements.

Typically there are four identical wide range channels in the nuclear instruments system. The modularity of our system allows easy installation, quick troubleshooting and repair.

Each wide range 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
  • Optical isolator assembly
  • Signal processor cables
  • Wide range signal processor (combining Source / Intermediate Range functions into a single drawer)
  • Shut down margin monitor assembly
  • Wall mount signal processor assembly

The signals from the wide range amplifier are connected to the rack mount signal processor. There, the monitor converts the signals from the amplifiers into signals that represent the source range count rate, the intermediate range power level, and the rate-of-change of reactor power level, as well as provide adjustable alarms when the SR or IR levels exceed their set points. The wide range signal processor is provided in a 19 inch rack mounted enclosure with LCD digital and bar graph meters.

The front panel meters include:

  • Source range              Power (log) count rate in CPS
  • Intermediate range      Power (log) in percent
  • Rate                            Rate of change in DPM