## Future realism upgrades

- [x] Steam generator UA·ΔT_lm heat exchange and pump head/flow curves; keep validating temps under nominal load.
- [x] Rod banks with worth curves, xenon/samarium buildup, and delayed-group kinetics per bank.
- [x] Pressurizer behavior, primary/secondary inventory and level effects, and pump NPSH/cavitation checks.
- [x] Model feedwater/steam-drum mass-energy balance, turbine throttle/efficiency maps, and condenser back-pressure.
- [x] Introduce CHF/DNB margin, clad/fuel split temps, and SCRAM matrix for subcooling loss or SG level/pressure trips.
- [x] Flesh out condenser behavior: vacuum pump limits, cooling water temperature coupling, and dynamic back-pressure with fouling.
- [ ] Dashboard polish: compact turbine/generator rows, color critical warnings (SCRAM/heat-sink), and reduce repeated log noise.
- [ ] Dashboard multi-page view (F1/F2): retain numeric view on F1; future F2 schematic should mirror real PWR layout with ASCII art, flow/relief status, and minimal animations; add help/status hints and size checks; keep perf sane.
- [x] Core thermal realism: add a simple radial fuel model (pellet/rim/clad temps) with burnup-driven conductivity drop and gap conductance; upgrade CHF/DNB correlation (e.g., Groeneveld/Chen) parameterized by pressure, mass flux, and quality, then calibrate margins.
- [ ] Transient protection ladder: add dP/dt and dT/dt trips for SG overfill/depressurization and rod-run-in alarms; implement graded warn/arm/trip stages surfaced on the dashboard.
- [ ] Chemistry & fouling: track dissolved oxygen/boron and corrosion/fouling that degrade HX efficiency and condenser vacuum; let feedwater temperature/chemistry affect steam purity/back-pressure.
- [ ] Balance-of-plant dynamics: steam-drum level controller with shrink/swell, feedwater valve model, turbine throttle governor/overspeed trip, and improved load-follow tied to grid demand ramps.
- [ ] Component wear & maintenance: make wear depend on duty cycle and off-nominal conditions (cavitation, high ΔP, high temp); add preventive maintenance scheduling and show next-due in the dashboard.
- [ ] Scenarios & tooling: presets for cold start, load-follow, and fault injection (pump fail, relief stuck) with seedable randomness; snapshot diff tooling to compare saved states.
- [ ] Incremental realism plan:
  - [x] Add stored enthalpy for primary/secondary loops and a steam-drum mass/energy balance (sensible + latent) while keeping existing pump logic and tests passing. Target representative PWR conditions: primary 15–16 MPa, 290–320 °C inlet/320–330 °C outlet, secondary saturation ~6–7 MPa with boil at ~490–510 K.
  - [x] Adjust HX/pressure handling to use stored energy (saturation clamp and pressure rise) and validate steam formation with both pumps at ~3 GW. Use realistic tube-side material assumptions (Inconel 690/SS cladding) and clamp steam quality to phase-equilibrium enthalpy.
  - [x] Update turbine power mapping to consume steam enthalpy/quality and align protection trips with real steam presence; drive inlet steam around 6–7 MPa, quality/enthalpy-based flow to ~550–600 MW(e) per machine class if steam is available.
  - [x] Add integration test: cold start → gens/pumps 2/2 → ramp to ~3 GW → confirm steam quality threshold at the secondary drum → enable all turbines and require electrical output. Include a step that tolerates one secondary pump off for a period to prove redundancy still yields steam.
- [x] Dashboard follow-ups: replace turbine “Steam P” with a more useful steam availability signal (enthalpy × steam flow).
- [x] Relief modeling: vent both loops gradually to ~1 MPa when reliefs are open, removing steam enthalpy/mass and capping pump targets to prevent instant repressurization.