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Perimeter Monitoring Upgrade at Canadian Nuclear Power Station
Posted on December 3rd, 2015

Nuclear power plants regulated by the Canadian Nuclear Safety Commission (CNSC) are required to comply with CNSC Regulation Document 2.10.1 “Nuclear Emergency Preparedness and Response” (REGDOC-2.10.1).  This set of requirements specifies program elements that must be incorporated into operating plants’ emergency preparedness programs to ensure protection of the environment and public, and to ensure national security.  For reactors with thermal capacity exceeding 10 Megawatts, additional protections must be implemented including real-time fixed perimeter radiological detection and monitoring systems, and the capability to perform expedient estimates of the dose to the public based on source term, plume dispersion and dose modeling. 

Recently, a Canadian power plant upgraded their perimeter monitoring equipment to comply with CNSC REGDOC-2.10.1.  This 660 Megawatt unit implemented a comprehensive monitoring system manufactured by Mirion Technologies and received commissioning support and training from Mirion staff and Jason Stevenson of RSCS. The system installed consisted of 16 monitoring stations (out to 1 km (0.62 miles)), 2 repeaters, 1 active antenna, and a server running TeleView 3000 Telemetry software. The monitors and repeaters are solar powered with multiple days of backup battery power.

This perimeter monitoring system is capable of detecting gamma radiation levels from 0.01 µSv/hr to 10 Sv/hr (1 µrem/hr to 1000 rem/hr) and sends information back to the server on Mirion’s WRM2 900 MHz network. Repeaters were used to ensure excellent site coverage by the current system, and provide the ability to expand the system in the future. Information from the entire system is gathered by an active antenna and transferred to a central server running TeleView 3000 software. The radiological information (as well as system status including battery, tamper, and charging statuses) is displayed on a site image map showing each location. The information can be accessed by anyone connected to the site network.

RSCS and Mirion Technologies provided training to the power plant staff from three different groups.  Operations and Sustainability staff were trained on the installation and operation of the system, power requirements, detection capacity, and customization options.  Staff from the Electrical Instrumentation & Control (EI&C) group were trained on the calibration and maintenance of the system detectors, repeaters, power units, and peripherals.  The Emergency Planning group were trained on the functionality of the system, use of TeleView 3000 software, and real time data available for continual assessment of any emergency condition and characterization of exposure risk to the public and environment as per REGDOC-2.10.1.

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