Our high performance analytical systems have been used in the nuclear industry since 1980. They enable operators to monitor hydrogen and oxygen levels at critical locations within both boiling water reactors (BWR) and pressurised water reactors (PWR).
Latest sensing technologies are combined with state-of-the-art conditioning to provide an automated approach to gaseous hydrogen and oxygen analysis.
Our industry experts can select from a range of sensors, hardware and software to ensure optimum performance for your application.
See the full range of gas monitoring solutions.
The analyser system is arranged as two assemblies:
Remote control assembly: This is designed for mild environment locations.
It includes a PLC based control and conditioning assembly, a touch screen display and system switch panel.
Sample station assembly: This is designed for harsh post-accident conditions.
Components within the local sample station are limited to only those required to extract, measure and return sample to containment. Interconnect between the assemblies is electrical only. All signals are robust and low impedance requiring no special cabling beyond normal considerations for analogue signals.
For the INSITU system, the sensors and a local calibration gas supply are mounted on a bracket for installation in containment. (what does this mean?)
Packaging options are available including free-standing enclosures or re-use of existing free-standing enclosures.
Approved for safety categories 2 and 3 (Amended Rule 10CFR 50.44)
The microprocessor assembly contains all of the programming and processing power required for Category 1 CAMS operation, supervision and control. This assembly also provides the primary operator interface via the chassis front touch screen display. It is packaged within a rail mounted enclosure designed for installation into a free-standing enclosure. Once installed, access to the modules making up the PLC may be accomplished by removing the screws retaining the front panel to the enclosure, pulling the unit forward on its slide rails.
The microprocessor PLC includes a set of modules selected to process data accumulated from the local analyser sample station, provide logic output for operation of all sample station ON-OFF functions, provide information to the field in the forms of analogue output signals, alarm contact closures and as a visual display. (need to review and simplify text)
Sample enters the sample loop assembly through SV1, passes through a short section of tubing into a container within which sample liquid content is separated from the sample and collected by a condensate trap. The sample continues onto the detection chamber through a section of heat traced tubing. At and within the detection chamber, all partial and total pressure measurements are obtained. Sample exits the detection chamber, passing through a flow switch and finally through the sample pump used to drive sample out of the sample loop assembly through SV7. FR1 is included to provide the user a convenient method for determining sample loop flow rate.
The mild environment systems are suitable for applications including Containment inerting, Waste Gas Monitoring, and Off Gas Monitoring. Electrochemical sensing technology is combined with “state of the art” PLC based signal conditioning to provide an automated approach for monitoring hydrogen and/or oxygen. The system is arranged in two subassemblies, the Control center and the sample loop assembly.
The Control Center includes a user friendly touch screen human interface (shown) and a PLC (not shown). The sample loop assembly is completely assembled onto a unistrut frame suitable for installation into a free standing enclosure or attachment to plant structure. All sensors and sample handling components are included within the sample loop assembly. The Control Center controls the sample loop assembly and processes all sensor signals to provide the required concentration in units of volume % (wet basis).
(need to review and simplify text)
We can provide an analytical solution to meet your application needs. The selection considers both operating conditions as well as performance needs. Although the technologies used may be extended beyond the ranges shown, typical specifications are as listed below.
| Parameter | Value |
|---|---|
| Range: | 500 PPM to 100% |
| Operating Conditions: Temperature Pressure Humidity |
-20°C to 152°C (-4°F to 306°F) 0.5 Atmosphere to 5 Atmospheres 0 to 100% (non-condensing) |
| System Outputs: | 4-20 mADC Visual Display Alarm Contacts |
| Alarm Contact Rating: | Up to 10 Amps |
| Calibration Frequency: | 3 to 6 Months |
Scheduled maintenance tasks have been identified to enhance the overall reliability and accuracy of the system. This is accomplished through the following activities:
The following is a tabulation of maintenance activities, along with recommended frequency and a brief description of the task. The frequency column represents the maximum interval between performance of the activity. For Category 1 applications, the maximum interval should not be exceeded except under conditions identified in the table.
| Activity | Frequency | Task |
|---|---|---|
| Primary Calibration | 90 days | Initiate auto cal to a partial pressure sensor two point check. Record total pressure for future reference. |
| Pump Motor Assembly | 12 Months | Inspect motor mounting hardware and, if Sample Station is normally in Standby, check motor insulation resistance. |
| Conditioner Status | 18 Months | Check Transducer Drive Voltage, Power Supply Outputs and DAC Outputs |
| Pump Motor Assembly | 18 Months | Verify dead-head pressure. Rebuild if significant change. |
| Alarms | 18 Months | Verify Alarm Functions |
| Cal Gas Supply | 36 Months | Check Gas Cylinder pressures and note usage rate. Leak check supply manifold if usage rate is excessive. Update Cal Gas Data if cylinders are changed. |
| Pressure Transducer (RTD if Applicable) |
36 Months > | Perform two point check of the total pressure (and, if applicable, temperature) measurement function. Update factors as needed. |
| Pump Motor Assembly | 36 Months | Refurbish pump. If pump operation is intermittent, it can be deferred to 60 months. |
| Pump Motor Assembly | 5 Years | Rebuild Pump. If in continuous operation, pump rebuild should be every 36 months. |
| Partial Pressure Sensors | 10 Years | Replace Partial Pressure Sensors |
| Solenoid Coil Replacement | 14 Years | Replace Coils for 1E Asco Solenoid Valves. Operating life is based on 109°F ambient temperature and may be extended if unit is operating at a lower ambient temperature or is normally in Standby mode. |
The sample station, contains only the equipment required to extract sample from containment, perform the required measurements, and return the sample back to containment. All other system components required to complete the sampling system functions and control are located at the Remote Control Center. This arrangement permits complete operation of the system from the mild-environment Remote Control Center location.
Our analyzers are used worldwide in Nuclear power plants to monitor the H2/O2 gas concentration level of Waste or Off Gas post-accident. The analyzers provide critical information in which plant operators can take action to prevent a catastrophic explosion accident.
Our state of the art Nuclear Analyzers are used by power generation utilities worldwide in North America, France, other European countries, China, and Korea. Our OEM customers include Westinghouse, KHNP, and EDF.
For more information, please contact MSSI-SCSupport@meggitt.com .
