IEEE 946-1985

946-1985 is a technical standard for related DC auxiliary power systems used in nuclear power generating stations. It addresses the design and application context for direct-current support systems that help keep essential station functions available when normal power sources are interrupted. As a superseded document, it remains relevant for understanding historical design expectations, legacy equipment, and compliance references tied to nuclear auxiliary power arrangements in the power, energy, and industry applications field.

What is 946-1985?

946-1985 defines guidance for related DC auxiliary power systems in nuclear power generating stations, where dependable low-voltage direct-current supply is a critical part of plant support infrastructure. The standard is concerned with technical requirements that may influence system arrangement, performance expectations, and coordination with other station electrical equipment. In practice, it serves as a reference point for engineers, buyers, and compliance teams working with nuclear plant auxiliary DC systems, especially when reviewing legacy designs or documentation.

Where is 946-1985 used?

This standard is typically used in nuclear power generating stations and related engineering workflows involving DC auxiliary power distribution, control, and support equipment. It is most relevant where station batteries, chargers, protective devices, and associated DC circuits must operate reliably as part of the plant’s auxiliary electrical architecture. Teams involved in design review, maintenance planning, procurement, or retrofit assessment may use 946-1985 to interpret historical requirements for system coordination and technical consistency.

Why is 946-1985 important?

946-1985 matters because DC auxiliary power is often tied to essential station reliability, especially in environments where uninterrupted support power can affect control, monitoring, and protection functions. Using a defined standard helps reduce ambiguity in design intent, supports consistent specification writing, and can improve procurement and verification of related equipment. For legacy nuclear installations, it also provides a useful reference for comparing existing systems against earlier engineering expectations and maintaining documentation discipline.

• DC auxiliary power for nuclear stations
• Legacy design and documentation reference
• Support for station battery systems
• Engineering and procurement consistency
• Superseded technical guidance