From Grid to Core: How a Nuclear Power Plant Works, for the Engineer Who Has Never Seen One.

Have you ever wondered what happens when a skilled software, electrical, or control systems engineer opens a nuclear plant simulator for the first time? You instantly recognize the generators, turbines, and grid connection. But then you hit a screen labeled Reactor Kinetics, a value called pcm, or a button marked SCRAM, and find yourself in uncharted territory.

From Grid to Core is written specifically to bridge that gap.

Unlike traditional nuclear textbooks that begin with dense atomic physics and hand down axioms from page one, this book takes a deliberately reversed engineering approach. We start at the 400 kV switchyard—ground you already own as an engineer—and walk upstream, room by room, until we reach the nuclear core. Every new concept is explained using the language you already speak: control loops, negative feedback paths, numerical solvers, and component degradation.

Try the Live Software Demo Now!

This book is a hands-on, deeply integrated companion guide to NEXUS-1, a fully interactive, browser-based nuclear plant operator console and digital twin.

No server, no installation, and zero setup required. The entire simulator runs locally in your browser. You can load it right now, play with the control rods, monitor the core parameters, and watch the physics engines calculate the math live:

👉 Play with the Live Simulator: https://gregory82gr.github.io/Nexus-1-phase-0/

What’s Under the Hood? (The Engineering Blueprint)

This is not a cosmetic layout or a sci-fi game. The companion book explains the literal software architecture and mathematical implementations executing live inside the NEXUS-1 Phase 0 demonstrator:

• The Point-Kinetics Engine: Learn how the simulator solves the standard reactor dynamics equations using 6 delayed-neutron precursor groups (U-235 data) and a 12-group decay heat afterheat model.
• The Closed-Loop Feedback: Explore how the system self-regulates through physical negative feedback loops: Doppler gain (fuel temperature), moderator gain (coolant temperature), and Xenon-135 worth.
• Solver Validation & Verification: See how the live numerical integration scheme (built to handle stiff differential equations) is verified in real-time against textbook closed-form equations like the inhour equation and prompt-jump formula.
• Advanced Modules: Dive into the architecture of predictive diagnostics, automated alarm flood correlation using causal fault-propagation graphs, and interpretable reinforcement learning (Q-learning) for autonomous rod control.

How Every Chapter is Structured

To ensure maximum utility, every single chapter follows a predictable engineering blueprint:

1. What You Already Know: The structural bridge from your existing enterprise software, electronics, or control systems background.
2. The Concept: A clear, prose explanation of the system's real-world physics.
3. See it in NEXUS-1: Direct guidance on where and how that concept lives live on your simulator screen.
4. Try It (Drills): Guided interactive drills to manipulate the console (e.g., triggering a +10 pcm step or a post-shutdown Xenon transient) and analyze the telemetry response.
5. Honest Boundary: A completely transparent look at exactly where the Phase 0 simulator simplifies engineering realities and where it faithfully integrates exact textbook physics.

👤 Who This Is For

This project requires zero prior nuclear knowledge. If you are fluent in software engineering, systems design, control theory, or basic engineering, and you want to demystify how a modern Pressurized Water Reactor (PWR) works by driving a real, live-computed simulator, this book is built for you.