diff --git a/TODO.md b/TODO.md
index d8a7cfa..e703992 100644
--- a/TODO.md
+++ b/TODO.md
@@ -4,7 +4,7 @@
 - [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.
-- [ ] Introduce CHF/DNB margin, clad/fuel split temps, and SCRAM matrix for subcooling loss or SG level/pressure trips.
+- [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.