Resilience Metrics and Definitions
Resilience is measurable: availability, reliability, ride-through, restoration time, and independence duration each capture part of it.
Defining the terms
Resilience is often used loosely; here it is broken into measurable properties. Each captures a distinct aspect of how well installation power survives disruption, and each can be designed to and reported honestly.
- Availability: fraction of time producing usable power (burner 0.86–0.995).
- Reliability: probability of running without failure over a mission interval.
- Ride-through: how long the system carries load through a source loss.
- Restoration time: how fast full power returns after an outage (MTTR + black-start).
- Independence duration: how long the base runs with no external supply.
Why several metrics are needed
No single number captures resilience. A unit can have high independence duration (long fuel interval) but modest availability (trips and maintenance). The system-level goal is to combine sources so that every metric meets the mission requirement, not just one. Reporting all of them prevents a favourable number from masking a weak one.
Honest reporting
Kronos reports the availability figure that the physics and engineering support (0.86–0.995), against the Tier III reference (0.99982), rather than an aspirational single value. The other metrics are set largely by the storage and redundancy design, which is where much of the resilience is actually engineered.
No single number captures resilience
A unit can have long independence duration but modest availability, so reporting one favourable metric can mask a weak one. The system goal is that every dimension — availability, reliability, ride-through, restoration time, independence duration — meets the mission requirement. Kronos reports the availability the physics supports (0.86–0.995) against the Tier III reference, not an aspirational single value.