IEEE DRAFT 741 : D1 2006

1 Scope
2 Normative references
3 Definitions
4 General design criteria
5 Principal design criteria and requirements
  5.1 AC power distribution systems
  5.2 DC power system
  5.3 Instrumentation and control power system
  5.4 Primary containment electrical penetration assemblies
  5.5 Valve actuator motors (direct gear driven)
6 Testing and surveillance
  6.1 Device testing
  6.2 Preoperational tests
  6.3 Surveillance
Annex A (informative) Illustration of concepts associated with
        degraded voltage protection
      A.1 Purpose
      A.2 Discussion
      A.3 Degraded voltage relay voltage settings
      A.4 Degraded voltage relay time delay settings
      A.5 Loss of voltage relay settings
      A.6 High voltage conditions
      A.7 Off-Site system voltage considerations
      A.8 Tolerances
      A.9 Bibliography
Annex B (informative) Guidelines for selection of overload
        protection for valve actuator motor circuits
      B.1 Purpose
      B.2 Definitions
      B.3 Discussion
      B.4 Overload protection devices
      B.5 Typical procedures for selection of TORs
      B.6 Bibliography
Annex C (informative) Auxiliary system automatic bus transfer -
        protection concerns
      C.1 Purpose
      C.2 Discussion
      C.3 Bus transfer analysis
      C.4 Bus transfer protection issues
      C.5 Implementation of a bus transfer scheme using dynamic
          modeling
      C.6 Bibliography
Annex D (informative) Use of high-speed magnetic circuit
        breakers for special applications
      D.1 Purpose
      D.2 Discussion
Annex E (informative) Bibliography

Presents criteria that establish protection requirements for Class 1E power systems and equipment. It specifies the purpose of and the means for obtaining protection from electrical and mechanical damage, or failures that can occur within a time period that is shorter than that required for operator action. It includes testing and surveillance requirements.