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The WESTINGHOUSE 1C31124G01 is a high-integrity Neutron Monitoring Channel module engineered for nuclear power plant safety systems. As part of Westinghouse’s core instrumentation platform, this safety-class (IEEE 603/IEC 61513) component provides real-time neutron flux measurement for reactor power control and protection functions. The 1C31124G01 integrates signal conditioning, range switching, and trip logic for ex-core neutron detectors, enabling precise monitoring from startup to full power operation. Its dual-channel redundant architecture with cross-comparison diagnostics ensures fail-safe performance in Class 1E environments. Designed for 40+ year service life, the WESTINGHOUSE 1C31124G01 features radiation-hardened components, EMI/RFI immunity, and seismic qualification (IEEE 344), making it indispensable for reactor safety systems where measurement integrity prevents catastrophic events.
Operating across six decades of neutron flux (10⁻⁹ to 10⁻³ A), this module supports automatic source range/intermediate range/power range transitions with overlapping calibration. The 1C31124G01‘s patented drift compensation maintains ±1% accuracy over 18-month fuel cycles, while its isolated 4–20mA outputs and relay contacts interface with reactor trip systems and control rooms. For nuclear operators requiring NRC-compliant instrumentation, the WESTINGHOUSE 1C31124G01 delivers unparalleled reliability in boiling water reactors (BWR) and pressurized water reactors (PWR), with built-in test capabilities reducing refueling outage durations.
WESTINGHOUSE 1C31124G01
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | 1C31124G01 |
| Manufacturer | Westinghouse Electric Company |
| Product Type | Nuclear Instrumentation Channel (Neutron Monitoring) |
| Input Signal | Neutron Detector Current (10⁻¹² to 10⁻³ A) |
| Measurement Ranges | Source (10⁻⁹–10⁻⁶ A), Intermediate (10⁻⁶–10⁻³ A), Power (10⁻⁵–10⁻¹ A) |
| Accuracy | ±1% of reading (±2% full scale) |
| Output Signals | 4–20mA (isolated), Form-C relay contacts |
| Response Time | < 500> |
| Safety Classification | Class 1E (IEEE 603) |
| Environmental Qualification | Seismic Category I (IEEE 344), Radiation Hardened |
| Operating Temperature | 0°C to +50°C (+32°F to +122°F) |
| Power Supply | 120V AC ±10% / 48V DC backup |
| EMC Compliance | IEEE 323, IEC 61000-6 |
| Calibration Interval | 18 months (typical) |
| MTBF | > 250,000 hours |
| Dimensions | 430 x 280 x 180 mm (17 x 11 x 7 in) |
Main Features and Advantages
Multi-Range Precision: Automatic range switching with overlapping calibration ensures seamless neutron flux monitoring from shutdown to 120% power. Proprietary temperature compensation maintains accuracy across ambient fluctuations in containment buildings.
Safety-Grade Diagnostics: Dual processing channels with continuous “compare-for-trouble” logic detect discrepancies before initiating reactor trips. On-demand self-test verifies measurement chain integrity without interrupting operations.
Seismic Resilience: Components qualified for 5g sinusoidal vibration and 12g shock loads, ensuring functionality during seismic events. Conformal-coated circuit boards resist humidity and hydrogen atmospheres.
Legacy Compatibility: Interfaces directly with Westinghouse’s neutron detectors (AXIS90 series) and replaces obsolete models like 1C31122G01 without rewiring. Backplane-compatible with WDPF and Ovation® control systems.
Regulatory Compliance: Full documentation suite includes FSAR references, QAM-1 manufacturing records, and NUPIC audit trails for 10CFR50 Appendix B compliance.
Application Field
The WESTINGHOUSE 1C31124G01 is deployed exclusively in nuclear power generation for critical safety functions:
Reactor Protection: Initiates scram signals when neutron flux exceeds safe thresholds during startup or power operations
Power Range Monitoring: Provides real-time % power data to control rod drive mechanisms and feedwater systems
Periodic Testing: Verifies reactor period safety limits during low-power physics testing
Shutdown Margin Monitoring: Confirms subcriticality during refueling via source range measurements
LOOP Mitigation: Detects abnormal flux oscillations during loss-of-offsite-power scenarios
Specifically designed for Westinghouse PWRs (AP1000®, CAP1400) and BWRs, it integrates with digital control cabinets in containment penetration areas. The 1C31124G01‘s radiation tolerance (>100 kRad) makes it suitable for in-containment installation near reactor vessel heads.
WESTINGHOUSE 1C31124G01
Related Products
WESTINGHOUSE 1C31232G01: Wide-range neutron monitor for research reactors, sharing backplane with 1C31124G01.
WESTINGHOUSE A2000N: Ex-core neutron detector compatible with 1C31124G01 input circuits.
WESTINGHOUSE 1C31222G01: Predecessor model requiring retrofit to 1C31124G01 for modern compliance.
WESTINGHOUSE 1C31134G01: Gamma-compensated channel for mixed radiation fields.
WESTINGHOUSE 1C3101A: Test console for calibrating 1C31124G01 channels during outages.
WESTINGHOUSE 1C31315G01: Signal processor module for 1C31124G01 output conditioning.
WESTINGHOUSE 1C31444G01: Class 1E power supply for redundant 1C31124G01 configurations.
WESTINGHOUSE AXIS-90: Digital safety platform integrating multiple 1C31124G01 channels.
