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The EMERSON 1C31129G03 is a Safety-Class Ventilation Radiation Monitor Module designed for nuclear containment systems, delivering continuous airborne particulate monitoring in Class 1E environments. As part of Emerson’s Ovation® Safety Platform, this IEC 61508 SIL 3 / IEEE 603-certified module detects alpha/beta/gamma radiation in containment ventilation ducts with triple-redundant processing. The 1C31129G03 interfaces with scintillation detectors and air-sampling systems, providing automatic alarm initiation when radioactivity exceeds NRC-approved setpoints. Its radiation-hardened design withstands 100 kRad TID (Total Ionizing Dose) and operates under seismic events (IEEE 344 Category I). For nuclear power plants requiring compliance with 10CFR50 Appendix B, the EMERSON 1C31129G03 ensures failsafe containment integrity monitoring during normal operations and accident scenarios, featuring automatic range switching from background to post-accident levels (1–10⁶ Bq/m³) with ±5% accuracy.
Engineered for 40-year service life, the module incorporates drift-compensated signal conditioning and HEPA filter clog detection. Dual 4–20mA outputs and Form-C relays enable integration with reactor trip systems and emergency control panels. The EMERSON 1C31129G03‘s modular hot-swap design reduces outage durations during maintenance while its embedded diagnostics validate channel integrity every 30 seconds. For PWR/BWR containment ventilation isolation systems, this module provides the critical data link between radiation surveillance and engineered safety features.
EMERSON 1C31129G03
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | 1C31129G03 |
| Manufacturer | Emerson (formerly Westinghouse Nuclear) |
| Product Type | Nuclear Radiation Monitor Module |
| Detection Range | 1–1,000,000 Bq/m³ (adjustable ranges) |
| Detector Compatibility | Scintillation Counters (Alpha/Beta/Gamma) |
| Accuracy | ±5% of reading (±10% at 1 Bq/m³) |
| Response Time | < 2> |
| Output Signals | Dual 4–20mA (isolated), 2 Form-C relays |
| Alarm Setpoints | 4 field-configurable (NRC-approved) |
| Safety Certification | IEEE 603, IEC 61513 SIL 3, Class 1E |
| Environmental Qualification | Seismic Cat I (5g), 100 kRad radiation |
| Operating Temperature | 0°C to +50°C (+32°F to +122°F) |
| Power Supply | 48V DC ±10% / 120V AC backup |
| Communication | Modbus TCP (optional) |
| Calibration Stability | <2> |
| MTBF | > 200,000 hours |
| Dimensions | 356 x 240 x 89 mm (14 x 9.4 x 3.5 in) |
Main Features and Advantages
Triple-Redundant Safety Architecture: Three independent measurement chains with 2oo3 voting ensure spurious alarm rates <1E>
Accident-Range Monitoring: Patented auto-ranging circuitry transitions seamlessly from background levels (1 Bq/m³) to post-LOCA concentrations (1 MBq/m³) without manual intervention. Dynamic compensation for noble gas interference improves accuracy during severe accidents.
Self-Diagnostic Capability: Continuous verification includes:
Hourly background noise correction
Weekly pulse generator functional test
HEPA differential pressure monitoring
Detector voltage stability checks
Regulatory Compliance: Pre-approved setpoint methodologies and FSAR documentation packages meet NRC Regulatory Guide 1.97 requirements. Full QAM-1 manufacturing traceability with NUPIC-compliant calibration records.
Modernization Path: Backward-compatible with legacy Westinghouse ventilation monitors (e.g., 1C31127G01). Hot-swap trays allow retrofit during 24-hour outages.
Application Field
The EMERSON 1C31129G03 is mission-critical in nuclear containment safety systems:
Containment Isolation: Triggers HVAC isolation dampers when duct radioactivity indicates potential leakage, preventing radioactive release during accidents.
Post-Accident Monitoring: Quantifies airborne Cs-137/I-131 concentrations in containment atmosphere for emergency response decisions.
HEPA Efficiency Verification: Monitors filter breakthrough during normal operations via upstream/downstream detector arrays.
Personnel Access Control: Interlocks containment airlocks when particulate levels exceed access thresholds.
Waste Gas Decay Storage: Controls hold-up time for radioactive gases prior to stack release.
Deployed in PWR/BWR containment penetrations and ventilation stacks, the 1C31129G03 serves as the primary input for ESF-2 (Engineered Safety Feature) systems. Its radiation tolerance allows installation inside bio-shields near equipment hatches.
EMERSON 1C31129G03
Related Products
EMERSON 1C31128G03: Alpha-specific monitor for plutonium detection in MOX fuel facilities.
EMERSON DS200LCCAG1A: Legacy monitor upgradeable to 1C31129G03 via retrofit kit.
EMERSON 1C31219G01: Gamma background compensator for high-ambient areas.
EMERSON A6250A: Dual scintillator detector assembly for 1C31129G03 integration.
EMERSON 1C31444G01: Class 1E power supply for redundant 1C31129G03 configurations.
EMERSON Ovation SIS: Safety controller processing 1C31129G03 trip signals.
EMERSON 1C3109B: Test source assembly for in-situ calibration.
EMERSON 1C31129G02: Previous-gen module requiring G03 upgrade for digital comms.
