Enum: ReactorOperatingStateEnum

Operational states of nuclear reactors

URI: valuesets:ReactorOperatingStateEnum

Permissible Values

Value	Title	Meaning	Description	Cause	Control Mode	Control Rod Insertion	Control Rod Position	Control Rods	Criticality	Criticality Control	Duration	Flexibility	Follow Up	Frequency	Fuel Burnup	Fuel Handling	Investigation	Maintenance	Milestone	Neutron Level	Neutron Multiplication	Operation Mode	Operator Action	Operator Attention	Power Level	Pressure	Procedures	Reactor Head	Ready Time	Reasons	Recovery	Refueling	Safety Systems	Shutdown Speed	Shutdown Type	Temperature	Testing	Urgency
STARTUP	Startup		Reactor transitioning from shutdown to power operation				withdrawing				hours to days									increasing				high	rising from zero
CRITICAL	Critical		Reactor achieving self-sustaining chain reaction				critical position												first criticality achievement		k-effective = 1.0				minimal but self-sustaining
POWER_ESCALATION	Power Escalation		Reactor increasing power toward full power operation								days to weeks														increasing incrementally		systematic power increases										ongoing at each power level
FULL_POWER_OPERATION	Full Power Operation		Reactor operating at rated thermal power								typically 12-24 months				accumulating							commercial electricity generation			100% rated power
LOAD_FOLLOWING	Load Following		Reactor adjusting power to match electrical demand		automatic load following							grid demand responsive		daily power variations											variable based on demand
REDUCED_POWER	Reduced Power Operation		Reactor operating below rated power				partially inserted																		<100% rated power					maintenance, grid demand, testing
HOT_STANDBY	Hot Standby		Reactor subcritical but at operating temperature						subcritical																	operating pressure maintained			rapid return to power possible							operating temperature maintained
COLD_SHUTDOWN	Cold Shutdown		Reactor subcritical and cooled below operating temperature						subcritical with margin									major maintenance possible														possible in this state				<200°F (93°C) typically
REFUELING	Refueling		Reactor shut down for fuel replacement							strict procedures	typically 30-60 days					active fuel movement												removed
REACTOR_TRIP	Reactor Trip		Rapid automatic shutdown due to safety system actuation	safety system activation				fully inserted rapidly									cause determination required																	seconds
SCRAM	Scram		Emergency rapid shutdown of reactor			fastest possible							immediate safety assessment										manual or automatic												emergency shutdown
EMERGENCY_SHUTDOWN	Emergency Shutdown		Shutdown due to emergency conditions														extensive post-event analysis														detailed restart procedures		may be activated					immediate shutdown required

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
instantiates:
- valuesets_meta:ValueSetEnumDefinition
description: Operational states of nuclear reactors
title: Reactor Operating State
from_schema: https://w3id.org/linkml/valuesets
contributors:
- orcid:0000-0002-6601-2165
- https://github.com/anthropics/claude-code
status: DRAFT
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