Features

A typical reactor may be equipped with eight WRNM sensor channels installed in dry tubes. GE's Reuter Stokes WRNM functions as a fission counting device, counting single neutron events from below the source level up to 10⁹ nv, or approximately 10^-3 percent of the rated reactor power. As pulse pileups from single neutron counts begin to affect measurement linearity, the signal processing electronics connected to the sensor can be switched to analyze the sensor output using the voltage variance (Campbell) method. This signal analysis technique permits accurate measurement of neutron flux from 10⁸ to 1.5 x 10¹³ nv, or to approximately 10 percent of the rated reactor power.

• Single, stationary sensor replaces moveable SRM and IRM instrumentation eliminating mechanical drive system
• Hands-off operation
• Continuous power indication for entire startup period, requiring no range selection switches
• Long-life detector
• Nominal lifetime is 1.2 x 10²² nvt, but operational experience at some power plants has exceeded an average life of 1.7 x 10²² nvt (or approximately 10 full-power years)
• Reduces undervessel activities, maintenance and exposure during outages
• Environmentally and seismically qualified, meeting requirements of U.S. NRC Reg Guide 1.97 for post-accident monitoring

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