l0grisk intelligence · english

// analysis tool · v1.0.0

Thermal-discharge threshold selector

The rule is public. Its activation depends on the plant, date and grid context.

Five French nuclear plants. No scenario predicts river temperature, reactor safety or biological response.

// l0g tool

Which thermal limit applies?

Choose a plant, date and grid context. The tool returns published rules. It does not decide whether RTE needs the unit or predict the actual ecological effect.

Available only for Bugey from 12 to 20 July 2026.

Applicable regimeNormal climatic conditionssummer regime
Downstream temperature≤ 26 °C
Upstream-downstream warming≤ 5 °C
ScopePlant units under the applicable prescriptions
Documentary basisEDF Open Data, amended 2014 Bugey decision

This tool describes a published rule. It does not forecast river temperature, future compliance, reactor safety or biological response.

Method and limitations

The rule engine applies a selected set of public EDF and ASNR prescriptions for five sites. An RTE requirement activates the permanent second tier where available. The temporary Bugey decision can only be selected from 12 to 20 July 2026 and only when RTE requires reactors 4 and 5. Consolidated legal texts and operator measurements remain the legal and operational reference.

Sources: EDF Open Data, ASNR July 2025 technical note and ASNR decision 2026-DC-052.

  1. EDF Open Data, thermal-discharge thresholds and limits
  2. ASNR, thermal discharges during summer periods, July 2025
  3. ASNR decision 2026-DC-052, 10 July 2026

Model v1.0.0 · 2026-08-20