Control and Instrumentation

DOE-HDBK-6004-99

IEEE 577 Std., Standard Requirements for Reliability Analysis in the Design and Operation of

Safety Systems for Nuclear Power Generating Stations

IEEE 603 Std., Standard Criteria for Safety Systems for Nuclear Power Generating Stations

Radiation/Contamination and Equipment Life

Provisions should be made to avoid installation of safety-class electrical equipment, systems, and

components in areas of high radiation/contamination levels to prelude exposure that could degrade

the elements quality.

The electrical emergency/back-up power system, equipment and components should be qualified for

the life time radiation environment. The equipment structural design and qualification analysis should

use conservative end of life parameters. If a component expected lifetime is less than the facility

design life, the design should provide for component replacements.

Control and Instrumentation

The emergency/back-up power systems should be provided with instrumentation and control elements

and components to monitor the necessary parameters to perform their safety functions for normal

operation and for cases of emergency (Design Basis Accidents). The safety analysis should identify

and the design should implement:

1. Instrumentation to monitor the safety-class parameters.

2. Controls to maintain the measured parameters within the operational limits.

The design of safety-class systems should include sufficient redundancy and diversity to ensure that

single failure will not result in total loss of instrumentation or controls for required safety function.

Design Considerations

General

The preferred supply voltages are 13,800V, 3-phase, 60-Hz for all motors rated 3000-hp and above;

4,160V, 3-phase, 60-Hz, for all motors rated 251 to 2500-hp; and 480V, 3-phase, 60-Hz for all

motors 1 to 250-hp. Motors rated 3/4-hp and less may operate at 120V, single phase, 60-Hz, except

critical equipment and motor-operated valves (MOVs) that will be operated at a supply voltage of

480V, 3-phase, 60-Hz.

Electrical equipment and systems essential to safety functions defined in the safety analysis should be

identified as Safety Class, should conform to IEEE standards and guides for Class 1E electrical

systems and components.

Safety-class Diesel Generators and/or Combustion Turbine Generators

One non-safety-class and two safety-class diesel generators or combustion turbine-generators should

be provided for the fusion facility.