IEEE PC37.98/D3, Jan 2023 is a draft standard for seismic qualification testing of protective relays and auxiliaries used in nuclear facilities. It addresses how these control and protection devices should be evaluated so they can continue to perform under earthquake conditions. For power, energy, and nuclear engineering applications, the document helps define a common basis for testing and acceptance, reducing uncertainty when specifying equipment intended for safety-related service.

Overview of IEEE PC37.98/D3, Jan 2023

This draft technical document focuses on seismic qualification methods for protective relays and auxiliary equipment associated with nuclear installations. IEEE PC37.98/D3, Jan 2023 is relevant where control and protection functions must remain dependable during and after seismic events. The standard is important because it helps align test expectations, equipment evaluation, and documentation practices for devices that may support critical electrical protection schemes. Its scope is centered on qualification testing rather than general design guidance.

Typical use cases

IEEE PC37.98/D3, Jan 2023 is typically used when specifying, testing, or reviewing protective relays and auxiliaries for nuclear plant electrical systems. It may support procurement and qualification programs for relay panels, protective devices, and related control hardware that must meet seismic performance expectations. Engineers, test labs, and utilities can use it when preparing qualification evidence for safety-related applications, especially where equipment must be assessed for earthquake resilience before installation or service.

Why it matters

Seismic qualification is a critical part of risk control in nuclear facilities, and IEEE PC37.98/D3, Jan 2023 helps provide a clearer testing framework for that purpose. Using a defined standard can improve consistency between suppliers, laboratories, and plant owners while supporting compliance and documentation needs. It also helps reduce ambiguity in test scope and acceptance criteria, which is especially important for protective relays and auxiliaries that may influence system response during an earthquake.

• Seismic qualification testing
• Protective relays and auxiliary devices
• Nuclear facility electrical systems
• Testing and acceptance criteria
• Safety-related performance documentation