• Radiation Monitoring
• Nuclear Power Plant Radiation Monitoring
• Environmental and Plant Monitoring
• Radioactive Callibration Standards (PDF)
• Installations
• Electronic Personal Dosimeter

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MAJOR ASSEMBLIES

• RD-52 Gas Detector
• RM-80 Microprocessor
• RM-23L Control/Display Module
• Power Control Center
• customer Interface Junction Box
• Sample Pump

FEATURES RD-52 Gas Detector 6-decade range 4π lead shielding Integral checksource RM-80 Microprocessor Data acquisition and control Application-specific data base Local status indication Analog outputs External digital communications Multiple history files Continuous self-test Online diagnostics RM-23L Control/Display Module Local operator interface Digital display Status indication Purge, checksource and pump control OPTIONS Equipment RM-23A Control/Display Module Isokinetic Sample Probe Assembly Process Flow Rate Measurement System Qualifications Seismic - IEEE 344-1975 Environmental - IEEE 323-1974

OPERATION Modular Design Open-frame skid NEMA-12 enclosures Centralized customer connections Single-point power connection Enclosed wireways/conduit Process Sampling Self-contained sample pump Visual flowmeter Automatic or manual purge Automatic flow control Automatic isokinetic process flow tracking Gas Sampler Cylinder Particulate and Iodine Samplers DOCUMENTATION Equipment Manual Operation and maintenance instructions Engineering drawings Parts lists

The RD-5 Gas Detector consists of a thin plastic scintillation detector, checksource, 3-in. lead shield, and a stainless steel sample chamber. The detector is housed in the sample chamber and measures beta radiation providing an output pulse rate proportional to the concentration of radioactive gases in the sample stream. The checksource can be actuated, automatically or manually, to verify the operability of the detector and associated circuitry. The 3-in. lead shield minimizes the effects of background radiation.

Sample flow is provided through the RD-52 Gas Detector by a 120 V ac, single-phase, 1/2-HP, diaphragm pump. A cylinder is provided for collecting gas samples. Samplers are provided for collecting separate particulate and iodine samples.

The RM-80 Microprocessor performs data acquisition and control functions, and provides alarm relays, analog outputs, and digital communications. The RM-80 Microprocessor data base, which can be programmed for specific applications as required by the user, contains the calibration constants for the RD-52 Gas Detector, alarm set points, and history files (twenty-four 10-min averages, twenty-four 1-hr averages, and twenty-eight 24-hr averages).

Operator interface with the Gas Monitor is provided by a dedicated Control/Display Module or an integrated SE Central Computer System. The RM-23L and an optional RM-23A Control/Display Module continuously poll the RM-80 Microprocessor for the radiation level and operation status. The RM-23L Control/Display Module displays status and radiation level and allows the operator to control purge, checksource, and pump functions. Expanding the operator interface, the RM-23A Control/Display Module provides complete monitor control and allows display and alteration of channel and monitor items in the RM-80 Microprocessor data base. In addition, the RM-23A Control/Display Module provides alarm relay drivers and 4-to-20 mA analog outputs for peripherals such as a strip-chart recorder. Redundant RM-80 Microprocessor communication ports are provided to interface the Gas Monitor with an integrated SE Central Computer System.

SPECIFICATIONS

RD-52 Gas Detector: Beta scintillation detector; stainless steel sample chamber; shield assembly with hinged door; integral checksource assembly

Range: 8 x 10^-8 to 8 x 10^-2 µCi/cm³ (Xe¹³³) with 1 mR/hr background

Sample Temperature: 40° to 120°F (4° to 49°C)

Sample Pressure: 15 psig (1.05 kg/cm²) maximum

Sample Flow: 3 scfm (1.4 l/min) nominal; 1 to 4 scfm (.47 to 1.9 l/min) range

Power: 120 V ac, 50 to 60 Hz, 10 A nominal

Cabling: All skid cabling complete and contained in metal conduit for electrical shielding.

Weight: 1800 lb (820 kg) approximate

Plumbing: Type 304 or 316 stainless steel for all wetted parts except gaskets, detector cover, and the aluminum pump casing

Customer Piping Interfaces: 1/2-in., stainless steel pipe flanges or 3/4-in. compression fittings for sample inlet and outlet

Signal Processor: RM-80 Microprocessor; Integrated dose, 10³ Rad

Alarms: Two-level radiation-activated alarms (alert and high) independently adjustable over full range; one instrument operational alarm (operate status). Operate alarm activated by loss of power, loss of detector counts, checksource test failure, or loss of sample flow. Each alarm provided through relay contacts rated at 7.5 A at 120 V ac

Self-Test: Remote-controlled or automatic solenoid-operated checksource; automatic operation and self-diagnostics of the RM-80 Microprocessor; remote-controlled or automatic solenoid-operated purge.