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Meno — Infrastructure Intelligence Report

☢ Sizewell C

Nuclear Condition Monitoring · 52.2155°N, 1.6195°E · Analysis date: 2026-04-13
Comparison: July 2024 (Summer) vs June 2025 (Summer) · Sentinel-2 L2A · 10m resolution

Executive Summary

19.5% of the Sizewell monitoring area shows genuine year-on-year land-use change

19.5% of monitored pixels (108,101 out of 553,608) show anomalous year-on-year change. This is split between vegetation increase (50,353 pixels — regrowth, crop changes) and vegetation decrease (57,748 pixels — construction, clearing, new infrastructure). The NW perimeter shows concentrated vegetation increase suggesting possible encroachment, while the cooling intake and access road areas show surface disturbance consistent with the construction programme.

Key Metrics

19.5%
Anomalous Change
91%
Confidence
94%
Cloud-Free Coverage
12 days
Revisit Cycle

Risk Assessment

RED
Zone A — NW Perimeter
35.2% anomalous · Magnitude: 0.21
Action: Priority ground inspection within 7 days. 35% of pixels show anomalous change — concentrated vegetation increase suggests encroachment.
RED
Zone C — Access Road
42.3% anomalous · Magnitude: 0.22
Action: Priority ground inspection within 7 days. Highest anomaly rate on site — ground clearing and construction activity.
AMBER
Zone B — Cooling Intake
14.6% anomalous · Magnitude: 0.19
Action: Schedule ground inspection within 30 days. Moderate disturbance — verify against construction schedule.
GREEN
Zone D — Coastal Buffer
1.7% anomalous · Magnitude: 0.09
Action: Continue routine 12-day monitoring. Minimal change within coastal buffer zone.

Satellite Imagery

Sizewell C — NIR False Colour (June 2025)
Sizewell C — NIR False Colour (June 2025)
Bright red = healthy vegetation. Grey/white = bare soil, construction, infrastructure. Dark blue = water. The construction zone is clearly distinct from surrounding agricultural land.
Anomalous Year-on-Year Change
Anomalous Year-on-Year Change
Only pixels that changed more than ±0.08 NDVI between summer 2024 and summer 2025. Green = vegetation increase. Red = vegetation decrease. Black = no significant change (filtered out).
Change Zones — Annotated
Change Zones — Annotated
Same anomalous change map with monitoring zones overlaid. Zone A (NW Perimeter) shows encroachment. Zone B (Cooling Intake) shows construction. Zone C (Access Road) shows clearing.

Methodology

We compared two Sentinel-2 captures from the same season — July 2024 and June 2025 (both summer) — eliminating seasonal variation as a confounding factor. Any detected change represents genuine year-on-year land-use change, not just winter dormancy. Pixels are only flagged as anomalous if the NDVI change exceeds ±0.08, filtering out normal annual variation in vegetation health.

Confidence note: High confidence: same-season comparison eliminates seasonal noise. 94% cloud-free coverage. Anomaly threshold (+/-0.08 NDVI) filters sub-threshold variation.

Commercial Value

Satellite-based monitoring could reduce Sizewell C condition monitoring costs by an estimated 60–75% while increasing temporal resolution from quarterly to every 12 days.

Inspection Frequency
Quarterly (4/yr)
Every 12 days (30/yr)
7.5x more frequent
Cost per Inspection Cycle
£45,000–£65,000
£8,000–£12,000
~80% reduction
Annual Monitoring Cost
£180,000–£260,000
£60,000–£90,000
£120,000–£170,000 saved
Detection Latency
3–6 months
12 days
90%+ reduction
Site Access Required
Yes — security clearance
No — remote sensing
Zero site disruption

Strategic Implications

Same-season comparison proves that satellite monitoring can distinguish genuine land-use change from seasonal cycles. For the NDA’s £4.9m Condition Monitoring pipeline, this means automated, continuous 12-day surveillance that catches changes between quarterly inspections — a step-change in operational efficiency.

Procurement target: NDA £4.9m Condition Monitoring pipeline · ITT Close: Apr 2026 · Award: Jul 2026
Meno — AI-Powered Infrastructure Intelligence
AS9100 Quality Framework · CAA Orbital Compliance
Discovery Phase v0.1.0
Generated: 2026-04-17