Selection Pick a plant, analysis window, and peer group
Diablo Canyon 1 2016-01-01 to 2025-12-31 · data through 2026-08-24
Snapshot key PRA inputs at a glance
Empirical PRA Inputs normalized per reactor-year
| PRA Input | Value | Units | Basis |
|---|---|---|---|
| Initiating Event Frequencies (unplanned / forced) | |||
| IE-SHORT-TRANSIENT | 0.2000 | per reactor-year | 2 events, ≤2 d |
| IE-MEDIUM-TRANSIENT | 0.0000 | per reactor-year | 0 events, 3-5 d |
| IE-LONG-OUTAGE | 0.1000 | per reactor-year | 1 events, >5 d |
| IE-ALL-UNPLANNED | 0.3000 | per reactor-year | 3 events total |
| Exposure (duration-based) | |||
| EXPOSURE-SHORT | 0.300 | days / reactor-year | avg dur 1.50 d |
| EXPOSURE-MEDIUM | 0.000 | days / reactor-year | avg dur 0.00 d |
| EXPOSURE-LONG | 0.800 | days / reactor-year | avg dur 8.00 d |
| Plant Operating State Fractions (time-based) | |||
| STATE-FULL-POWER | 0.9015 | fraction | power > 90% |
| STATE-TRANSITION | 0.0337 | fraction | online, 1-90% |
| STATE-EARLY-SHUTDOWN | 0.0016 | fraction | forced, elapsed ≤2 d |
| STATE-MID-SHUTDOWN | 0.0014 | fraction | forced, 3-7 d |
| STATE-EXTENDED-SHUTDOWN | 0.0000 | fraction | forced, >7 d |
| STATE-REFUELING | 0.0619 | fraction | scheduled outages |
| Planned Outages (refueling) | |||
| REFUEL-FREQ | 0.5999 | per reactor-year | 6 outages |
| REFUEL-AVG-DAYS | 37.67 | days | mean scheduled duration |
Operating-State Distribution 3,653 observed days
Fuel Reliability Sample · INPO Sustained Fuel Reliability
The Sustained Fuel Reliability index (0 to 10, higher is better) is an INPO performance indicator of fuel-cladding integrity sustained over the last two operating cycles. It is a graded health index, not a Poisson frequency, so POET reports it as a benchmarked metric (value, trend, fleet rank), not as a gamma-Bayesian rate. For PRA it informs fuel-barrier / source-term and enterprise-risk judgments rather than an initiating-event frequency.
The Analyst tier adds the 2012-present trend chart and the U.S.-fleet benchmark for this indicator.
Sample from the INPO Performance Indicator program (Sustained Fuel Reliability), Jan 2012 to Apr 2026. Grade and quartile are as reported by INPO; percentile and fleet range are computed by POET over NukeWorker-tracked U.S. units. Import your own PIC export (grouped by owner) for current values.
Full PRA Report Analyst tier
Unlock the full, defensible PRA report
You are viewing the free summary above. The Analyst report turns these point estimates into a submittal-ready package:
- Bayesian credible intervals on every frequency (RADS-style 5th / mean / 95th)
- Per-event drill-down of every outage behind the numbers
- Year-by-year trend of the initiating event rate
- Fleet & peer benchmarking with the transient multiplier
- NRC industry-average comparison plus a Bayesian update against the NRC prior
- Fleet concurrency & seasonality
- Empirical-Bayes fleet model and initiating-event cause attribution (turbine trip, LOOP, loss of feedwater… from NRC event text)
- PRA Reference Library: component reliability, common-cause failure, and LOOP non-recovery data
- A printable full report (save as PDF) plus CSV / Excel / JSON / licensing-text export with full traceability metadata
Traceability
Plants included: 1 | Exposure: 10.00 reactor-calendar-years, 9.35 reactor-critical-years
Classification thresholds: SHORT<=2d, MEDIUM 3-5d, LONG>5d
Data source: NukeWorker outage database (NRC daily power reactor status + classified outage events)
Generated: 2026-08-24T08:25:13-04:00 | Full methodology & calculation logic →