Startup/Wide Range Detectors (SRNM/WRNM)

WRNM Detector

Single, Stationary Sensor

GE designed its Reuter Stokes wide range detector (WRNM) to perform the functions of both the source range monitor (SRM) and the intermediate range monitor (IRM) during reactor startup. Our WRNM detectors operate in a dry tube inside the reactor, core, and are permanently fixed within the reactor core, even at full-power operation, throughout the entire fuel cycle.

  

Features and Benefits

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

Related Offerings

For More Information

Contact one of these resources:

Commercial Operations
Call: Fred Askins at:
+1 330-963-2314
Send email to: frederick.askins@ge.com

Call: William Stringer at:
+1 330-963-2292
Send email to: william.stringer@ge.com

Global Sales
Call: Warren Phelan at:
+1 330-963-2458
Send email to: warren.phelan@ge.com

Product Line Leader
Call: Dan Waltermire at:
+1 330-963-2311
Send email to: dan.waltermire@ge.com

Call: Garrick Joseph at:
+1 330-486-0545
Send email to: garrick.joseph@ge.com

For existing order and shipment status
Call: Dianah McDonald at:
+1 330-963-2465
Send email to: dianah.mcdonald@ge.com