A Realistic Nuclear Reactor Simulator in Scratch

ScratchCoder_027

Hello everyone, I would like to share with you my attempt at making a realistic Nuclear Reactor Simulator in Scratch.

This game simulates a BWR-5 reactor (A boiling water reactor).

Turbowarp Link (recommended): https://turbowarp.org/1205592173/fullscreen?interpolate&clones=Infinity&hqpen
Scratch Link: https://scratch.mit.edu/projects/1205592173/fullscreen/

This was inspired by the games RBWR and EGS (on a platform I can't name)

Credits:
- Much of the mathematics and the code was adapted from the document RBWR Reactor Physics by Delfino Delphis
- The Text Engine was created by @awesome-llama on scratch
- R304B by the US NRC

Last edited by ScratchCoder_027 (Sept. 19, 2025 16:40:33)

ScratchCoder_027

Some Terms:
Neutron Monitoring Systems:

APRM - Average Power Range Monitoring System: (Basically the reactor power as a percent)
LPRM - Local Power Range Monitor: (Basically the reactor power out of 60 at a particular location in the reactor)
IRM - Intermediate Range Monitor: It shows the reactor power at low powers on a scale, you increase the range (from 1 to 10) as you increase power
SRM - Source Range Monitor: Shows the neutron count at that location, you move it up (withdraw it) to help keep it undamaged
TIP - Traversing Incore Probe : Here we use it only to calibrate the LPRMs

Other:

RRC - Reactor ReCirculation: It prevents steam bubbles (voids) from forming in the reactor and thus increases reactivity
Reactor Period- How fast power is increasing (lower means faster)
UPSC - Upscale: Reading High
DNSC - Downscale: Reading low
RWM - Rod Worth Minimizer: Tells you which rod you should pull
TRIP/SCRAM - Emergency Shutdown

ScratchCoder_027

DON'T WORRY IF THESE TERMS FEEL CONFUSING AT FIRST
These terms are quite technical, and are only used for descriptions.
The mechanics are actually quite simple and easy to control.
This game is more intended for a advanced audience familiar with some aspects of nuclear energy

Startup Procedure (and video) coming soon!

EPICSANSISAWSOME

I like this idea

ScratchCoder_027

Version 1.2.1:

Improved Rod Position display
Smoothened SRM

ScratchCoder_027

Official documentation released:
https://raw.githubusercontent.com/scratchcoder27/scratchcoder27.github.io/main/uploads/Reactor%20Startup%20SOP.pdf

Slight Edit:
In RUN mode, remember to increase recirculation flow once over 30 APRM

ScratchCoder_027

All documents and startup video are available here:
https://scratchcoder27.github.io/reactorsop

Last edited by ScratchCoder_027 (Sept. 23, 2025 14:27:02)

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