Description

The WESTINGHOUSE 1C31233G01 is a Class 1E-certified Sequence of Events Recorder (SOE) Module designed for nuclear power plant safety systems, providing timestamped event resolution down to 1ms for critical fault analysis. As part of Westinghouse’s Digital Integrated Protection System (DIPS), this IEEE 603-compliant module captures and sequences digital status changes from safety-related sensors, relays, and trip logic channels during transient events. The 1C31233G01 features dual-redundant processing with radiation-hardened memory (75 kRad TID), storing up to 10,000 events with nanosecond-synchronized timestamps derived from IRIG-B timecode inputs. Engineered for post-incident forensic analysis, it interfaces with reactor protection systems to document trip initiation sequences, valve actuations, and pump status changes for NRC compliance. For nuclear operators investigating reactor transients or design-basis events, the WESTINGHOUSE 1C31233G01 delivers uncompromising data integrity with tamper-proof audit trails and seismic resilience (IEEE 344 Category I).

Integrated within Westinghouse’s safety instrumented platforms, the 1C31233G01 supports 64 optically isolated digital inputs with change-of-state detection. Its patented timestamp synchronization maintains ±100ns accuracy across distributed systems, enabling precise reconstruction of event cascades. The module’s front-accessible CompactFlash storage allows secure data extraction without containment entry during outages. For PWR and BWR facilities requiring 10CFR50 Appendix B compliance, the WESTINGHOUSE 1C31233G01 provides vital documentation for FSAR updates and regulatory audits.

WESTINGHOUSE 1C31233G01

Technical Specifications

Main Features and Advantages

Atomic-Precision Timing:
Dual oven-controlled crystal oscillators (OCXO) with GPS-disciplined IRIG-B synchronization maintain ±100ns timestamp accuracy across plant-wide systems. Automatic leap-second correction ensures regulatory compliance.

Radiation-Hardened Architecture:
Error-correcting memory (ECC SDRAM) and SEU-resistant FPGAs prevent data corruption under neutron flux. Conformal-coated PCBs withstand containment atmospheres.

Forensic-Grade Data Capture:
64-channel parallel scanning detects state changes in 100μs. Configurable dead-band filtering eliminates contact bounce artifacts. Secure chain-of-custody logging meets NRC RG 1.180 requirements.

Rapid Incident Reconstruction:
Built-in analysis tools correlate events across multiple 1C31233G01 units. Automatic generation of IEEE 384-compliant sequence reports accelerates root cause analysis.

Maintenance Optimization:
On-demand channel health diagnostics detect aging contacts or wiring degradation. Hot-swappable storage modules enable data retrieval without system shutdown.

Application Field

The WESTINGHOUSE 1C31233G01 is indispensable in nuclear safety systems:

Reactor Trip Analysis: Timestamps scram initiation signals, control rod insertion, and safety injection triggers

ESF Actuation Verification: Sequences containment isolation valves, emergency cooling pumps, and HVAC dampers

Post-Accident Documentation: Captures event progression during LOCA or LOOP scenarios for NRC reporting

Periodic Testing: Validates safety system response times during surveillance tests (ANSI/ANS-4.5)

Cyber Event Logging: Records unauthorized access attempts to safety-critical systems

Installed in Class 1E control cabinets outside containment, the 1C31233G01 monitors Westinghouse DIPS, Common Q™, and Eagle 21 platforms. Its seismic qualification ensures functionality during design-basis earthquakes.

Related Products

WESTINGHOUSE 1C31234G01: 128-channel expansion module for 1C31233G01

WESTINGHOUSE 1C31166G01: RCP monitor providing input signals to 1C31233G01

WESTINGHOUSE DIPS-CPU: Protection system processor timestamped by 1C31233G01

WESTINGHOUSE 1C31233G02: Enhanced version with 1GigE interface

WESTINGHOUSE 1C31444G01: Class 1E power supply for SOE chassis

WESTINGHOUSE IRIG-BG: GPS clock generator for 1C31233G01 synchronization

WESTINGHOUSE 1C31235G01: Analog SOE module for transient waveform capture

WESTINGHOUSE 1C3109B: Calibration test set for 1C31233G01 verification