Nuclear Energy

Nuclear Instrumentation and Controls

Protection & Safety When It Counts

Discrete Logic Solving System (DLSS) protects nuclear power plants by monitoring, calculating and actuating protective elements to ensure safety measures are operational when needed.

DLSS is a non-digital system implemented in custom hardware-based logic that has a familiar PLC-like form, fit, and function. DLSS operates without FPGA, microcontroller or microprocessor running software.

A Unique Non-Digital Design Approach

DLSS offers a hardware-based architecture, solid-state electronics, analog and discrete logic circuits; and a simple configuration of common input/output modules and application-specific logic solving modules. Platform configuration (input/output distribution) is strategically defined to maximize availability (minimize downtime) of the critical functions.
 

DLSS Features

  • Non-digital, hardware-based architecture
  • Triple Modular Redundancy (TMR) for fault tolerance
  • Built-In Test (BIT) to detect faults
  • Hot Standby and Hot Swap Capabilities
  • Decentralized BIT isolates faults to Lowest Replaceable Unit (LRU)
  • Superior reliability through stringent derating criteria
  • Visual indicators at the LRU-level to report faults
  • Common platform approach reusable/ deployable to multiple applications
  • Long service life with decades of product support

DLSS Benefits

Simplified Controls

No software-like features avoid complexity & licensing risks associated with digital I&C make DLSS significantly less complex than general purpose platforms (e.g. PLCs).

Safe, Reliable System

Modern analog electronics enhance safety, reliability and efficiency while eliminating the risk of software common-cause failure. DLSS is designed, qualified and produced under a 10 CFR 50 Appendix B Quality Assurance Program.

Flexible Applications

The DLSS modular design can be integrated with new and retrofit applications and supports system diversity.

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