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The WESTINGHOUSE 1C31169G02 is a critical safety-grade input/output module from Westinghouse’s Common Q™ platform, designed for nuclear power plant protection systems. Engineered to meet IEEE 603 and IEC 61513 standards, this module performs high-integrity signal conditioning and voting logic for reactor trip functions. The 1C31169G02 integrates dual-channel processing with automatic self-testing, detecting faults within 50 ms to prevent spurious shutdowns. Its radiation-hardened design withstands 10⁶ rad total dose exposure, while seismic certification (IEEE 344) ensures operation during earthquakes. As part of Westinghouse’s digital I&C (Instrumentation & Control) architecture, this module interfaces with sensors monitoring neutron flux, coolant pressure, and temperature, converting signals for safety processors. The WESTINGHOUSE 1C31169G02 exemplifies nuclear-grade reliability with 60-year design life and NRC-approved fault tolerance.
WESTINGHOUSE 1C31169G02
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | 1C31169G02 |
| Manufacturer | Westinghouse Electric Company |
| Product Type | Nuclear Safety I/O Module |
| Input Types | Analog (4–20 mA), Digital (24 V DC) |
| Isolation | 2500 V AC channel-to-channel |
| Accuracy | ±0.1% FS (analog), ±1 µs (digital) |
| Response Time | <100> |
| Self-Test Interval | Continuous (hardware/software diagnostics) |
| Operating Temperature | -15°C to +55°C |
| Seismic Rating | 5g peak acceleration (IEEE 344) |
| Radiation Tolerance | 1×10⁶ rad (TID), 1×10¹³ n/cm² (neutron) |
| Power Supply | 48 V DC ±2% (redundant) |
| Certifications | IEEE 603 Class 1E, IEC 61508 SIL 3 |
| MTBF | >250,000 hours |
| Connector Type | MIL-DTL-38999 Series III |
Main Features and Advantages
Nuclear-Grade Fault Tolerance: The WESTINGHOUSE 1C31169G02 implements 2-out-of-4 voting logic with diverse redundancy (separate CPUs for analog/digital processing), achieving <10>
Radiation Hardened Design: Silicon-on-insulator (SOI) technology and borated aluminum shielding maintain functionality in 10⁶ rad environments. Gold-plated connectors prevent tin whisker growth in neutron flux.
Deterministic Performance: Dedicated FPGA logic executes safety algorithms without OS latency. Analog inputs feature 24-bit Σ-Δ conversion with drift compensation for RTD/thermocouple signals.
Cyber-Secure Architecture: Physical write-protect jumpers block firmware tampering. All data transmissions use Manchester encoding with CRC-32 validation for EMI immunity.
Application Areas
The WESTINGHOUSE 1C31169G02 is exclusively deployed in nuclear safety systems. In pressurized water reactors (PWRs), it processes signals for reactor trip breakers (RTBs) when neutron flux exceeds setpoints. For coolant systems, it monitors pressurizer level transmitters, initiating safety injection during LOCA (Loss-of-Coolant Accidents). The module enables turbine trip coordination during seismic events via accelerometer inputs. In spent fuel pools, it safeguards cooling pumps by validating temperature/pH sensor data against redundant channels. All applications leverage its NRC-licensed design basis for Class 1E systems.
Related Products
WESTINGHOUSE 1C31203G01: Safety processor for 1C31169G02 signal voting
WESTINGHOUSE 1C31232G01: Fission chamber interface module
WESTINGHOUSE 1C31181G03: HART-enabled analog input variant
WESTINGHOUSE 1C31264G01: Digital output module (200 V DC)
WESTINGHOUSE 1C31207G02: Power supply for Common Q racks
WESTINGHOUSE 1C31169G02
Installation and Maintenance
Pre-installation preparation: Perform gamma radiation survey to confirm <1>
Maintenance recommendations: Execute monthly online diagnostics through WDPF (Westinghouse Distributed Processing Family). Replace every 20 years per nuclear lifecycle management. Calibration requires NRC-approved procedures using traceable standards. Never hot-swap in safety-critical loops.
