Reviewing 50BF in a breaker-and-a-half nuclear switchyard: current and 52a detection, re-trip and DTT, and how a center breaker failure hits offsite power circuits.
Prompted by Hanul Unit 4, where a turbine-generator protection signal cascaded into a reactor trip, we set out the priority of turbine-trip coupling interlocks in the reactor protection system (RPS) and I/O design principles.
Control-level interlocks for PWR load following: accept turbine load requests based on rod insertion limit, delta-I band and post-xenon return reactivity margin.
The SDA main review of the 700 MW-class i-SMR has begun. A conceptual look at the interlock signals for the in-vessel hydraulic CRDM, alongside boron-free operation and passive safety.
Start interlocks for large MV motors such as nuclear circulating water pumps: bus voltage dip and re-acceleration, start counts, and discharge valve timing by pump type.
A mis-entered turbine control valve position limiter setpoint tripped Saeul Unit 3 during commissioning. How to add hard barriers at HMI acceptance, with an I/O map and ST pseudocode.
Isolating controlled-area ventilation on a radiation signal: enforcing supply stop, filter train diversion and normal exhaust closure in order, plus channel voting and degraded logic.
Bypass (2/3) or tripped state (1/3) for an RPS channel under maintenance, judged by spurious-trip margin and hardwired mutual exclusion.
Operating several SMR modules from one control room: end-to-end checks of module identifier and authority token at the module controller, plus shared system concurrency limits.
Why ESFAS seal-in and reset must be split into signal reset and equipment reset, and the traps in permissives and manual blocks.