Skip to content

Enum: ReactorOperatingStateEnum

Operational states of nuclear reactors

URI: valuesets:ReactorOperatingStateEnum

Permissible Values

Value Meaning Description
STARTUP None Reactor transitioning from shutdown to power operation
CRITICAL None Reactor achieving self-sustaining chain reaction
POWER_ESCALATION None Reactor increasing power toward full power operation
FULL_POWER_OPERATION None Reactor operating at rated thermal power
LOAD_FOLLOWING None Reactor adjusting power to match electrical demand
REDUCED_POWER None Reactor operating below rated power
HOT_STANDBY None Reactor subcritical but at operating temperature
COLD_SHUTDOWN None Reactor subcritical and cooled below operating temperature
REFUELING None Reactor shut down for fuel replacement
REACTOR_TRIP None Rapid automatic shutdown due to safety system actuation
SCRAM None Emergency rapid shutdown of reactor
EMERGENCY_SHUTDOWN None Shutdown due to emergency conditions

Slots

Name Description
reactor_operating_state Current operational state of nuclear reactor

Identifier and Mapping Information

Schema Source

  • from schema: https://w3id.org/linkml/valuesets

LinkML Source

name: ReactorOperatingStateEnum
description: Operational states of nuclear reactors
from_schema: https://w3id.org/linkml/valuesets
rank: 1000
permissible_values:
  STARTUP:
    text: STARTUP
    description: Reactor transitioning from shutdown to power operation
    annotations:
      neutron_level:
        tag: neutron_level
        value: increasing
      control_rod_position:
        tag: control_rod_position
        value: withdrawing
      power_level:
        tag: power_level
        value: rising from zero
      duration:
        tag: duration
        value: hours to days
      operator_attention:
        tag: operator_attention
        value: high
    title: Startup
  CRITICAL:
    text: CRITICAL
    description: Reactor achieving self-sustaining chain reaction
    annotations:
      neutron_multiplication:
        tag: neutron_multiplication
        value: k-effective = 1.0
      power_level:
        tag: power_level
        value: minimal but self-sustaining
      control_rod_position:
        tag: control_rod_position
        value: critical position
      milestone:
        tag: milestone
        value: first criticality achievement
    title: Critical
  POWER_ESCALATION:
    text: POWER_ESCALATION
    description: Reactor increasing power toward full power operation
    annotations:
      power_level:
        tag: power_level
        value: increasing incrementally
      testing:
        tag: testing
        value: ongoing at each power level
      duration:
        tag: duration
        value: days to weeks
      procedures:
        tag: procedures
        value: systematic power increases
    title: Power Escalation
  FULL_POWER_OPERATION:
    text: FULL_POWER_OPERATION
    description: Reactor operating at rated thermal power
    annotations:
      power_level:
        tag: power_level
        value: 100% rated power
      operation_mode:
        tag: operation_mode
        value: commercial electricity generation
      duration:
        tag: duration
        value: typically 12-24 months
      fuel_burnup:
        tag: fuel_burnup
        value: accumulating
    title: Full Power Operation
  LOAD_FOLLOWING:
    text: LOAD_FOLLOWING
    description: Reactor adjusting power to match electrical demand
    annotations:
      power_level:
        tag: power_level
        value: variable based on demand
      control_mode:
        tag: control_mode
        value: automatic load following
      flexibility:
        tag: flexibility
        value: grid demand responsive
      frequency:
        tag: frequency
        value: daily power variations
    title: Load Following
  REDUCED_POWER:
    text: REDUCED_POWER
    description: Reactor operating below rated power
    annotations:
      power_level:
        tag: power_level
        value: <100% rated power
      reasons:
        tag: reasons
        value: maintenance, grid demand, testing
      control_rod_position:
        tag: control_rod_position
        value: partially inserted
    title: Reduced Power Operation
  HOT_STANDBY:
    text: HOT_STANDBY
    description: Reactor subcritical but at operating temperature
    annotations:
      criticality:
        tag: criticality
        value: subcritical
      temperature:
        tag: temperature
        value: operating temperature maintained
      pressure:
        tag: pressure
        value: operating pressure maintained
      ready_time:
        tag: ready_time
        value: rapid return to power possible
    title: Hot Standby
  COLD_SHUTDOWN:
    text: COLD_SHUTDOWN
    description: Reactor subcritical and cooled below operating temperature
    annotations:
      criticality:
        tag: criticality
        value: subcritical with margin
      temperature:
        tag: temperature
        value: <200°F (93°C) typically
      refueling:
        tag: refueling
        value: possible in this state
      maintenance:
        tag: maintenance
        value: major maintenance possible
    title: Cold Shutdown
  REFUELING:
    text: REFUELING
    description: Reactor shut down for fuel replacement
    annotations:
      reactor_head:
        tag: reactor_head
        value: removed
      fuel_handling:
        tag: fuel_handling
        value: active fuel movement
      criticality_control:
        tag: criticality_control
        value: strict procedures
      duration:
        tag: duration
        value: typically 30-60 days
    title: Refueling
  REACTOR_TRIP:
    text: REACTOR_TRIP
    description: Rapid automatic shutdown due to safety system actuation
    annotations:
      shutdown_speed:
        tag: shutdown_speed
        value: seconds
      cause:
        tag: cause
        value: safety system activation
      control_rods:
        tag: control_rods
        value: fully inserted rapidly
      investigation:
        tag: investigation
        value: cause determination required
    title: Reactor Trip
  SCRAM:
    text: SCRAM
    description: Emergency rapid shutdown of reactor
    annotations:
      shutdown_type:
        tag: shutdown_type
        value: emergency shutdown
      control_rod_insertion:
        tag: control_rod_insertion
        value: fastest possible
      operator_action:
        tag: operator_action
        value: manual or automatic
      follow_up:
        tag: follow_up
        value: immediate safety assessment
    title: Scram
  EMERGENCY_SHUTDOWN:
    text: EMERGENCY_SHUTDOWN
    description: Shutdown due to emergency conditions
    annotations:
      urgency:
        tag: urgency
        value: immediate shutdown required
      safety_systems:
        tag: safety_systems
        value: may be activated
      investigation:
        tag: investigation
        value: extensive post-event analysis
      recovery:
        tag: recovery
        value: detailed restart procedures
    title: Emergency Shutdown