RBWR 1.7.0 Update Log – Welcome to the Next Era
With version 1.7.0, we’re not just releasing another update, we’re opening the gates to something much bigger. This marks the beginning of a bold new chapter in RBWR’s development history. Packed with core system rewrites, long-requested features, and foundational improvements, 1.7.0 sets the stage for something unprecedented.
But this is only the beginning.
Introducing the RBWR Overhaul Series (2025)
Welcome to the RBWR Overhaul Series, a massive, multi-update series initiative that will define the rest of 2025 for RBWR and the broader reactor community.
Starting with version 1.7.0 and continuing through Part 2 and Part 3, this series will deliver some of the most transformative updates in RBWR’s history. Each part will introduce groundbreaking features, sweeping design changes, and behind-the-scenes rewrites that will elevate RBWR to a whole new level of polish, realism, and performance. This is more than just an update series. It’s a redefinition of what RBWR is and what it can be.
The Overhaul Series will:
- Lay the groundwork for long-term scalability
- Rebuild outdated systems from the ground up
- Implement long-requested community features
- Deliver visual, technical, and functional upgrades like never before
Now let’s get onto the actual update…
We’re thrilled to announce the release of V1.7.0: The Blast To The Past Update!
Our developers have been hard at work nearly every day for the past two months to bring this update to life, arguably one of the most ambitious in RBWR’s history. This milestone wouldn’t have been possible without the tireless support of our dedicated QA testers, knowledgeable nuclear industry professionals, and the feedback from our beta testing community. Together, this team has helped shape an update that pushes RBWR to new levels of realism, stability, and depth.
We know you’ll love this update just as much as we do!
Revamped Unit 02 MCR
For the first time in RBWR history, we have FULLY revamped the Unit 02 MCR!
- Featuring an entirely new layout, from panels to desks!
- New switches, MSRV, and scram system.
- New annunciator functionality & alarm sounds.
- New vertical panels & revamped content on them.
- And much more!
A Look Back: The Legacy of Unit 2’s MCR
Since RBWR’s original release in September 2022, the Unit 2 Main Control Room (MCR) has remained one of the last untouched pieces of the game’s early foundation. While Unit 1 received a major revamp on October 22nd, 2023, bringing it in line with modern standards, Unit 2’s MCR held onto much of its original design. In mid-2023, Unit 2 did receive a partial update, introducing refreshed gauges, switches, annunciators, and a handful of other improvements. However, its core structure, layout, and interaction systems have largely remained unchanged since day one aside from various additions throughout the months and years. As we move into the RBWR Overhaul Series, Unit 2 is finally getting the full attention it deserves.
Complete Exterior Overhaul (Part 1)
We have completely overhauled the exterior of the map!
- New roads, parking lots, markings & more.
- New Oil Treatment Building. (Not functional this update)
- Updated & relocated the EDG building.
- New spray ponds (Not functional) & a second cooling tower.
- Marine filter wheels at the water treatment building.
- New park!
- Evacuation zone has been moved and is clearly marked now.
- And much more!
New Features
Plant Messaging System [PMS]
- The Plant Monitoring System has been added as an additional method of communication between U2 MCR operators and various areas of the plant. See dropdown for detailed information regarding the PMS.
Plant Messaging System [PMS]
The PMS can be used to quickly deliver important messages to other control stations within the facility. It uses pre-written messages that cannot be changed to ensure clarity and operational efficiency.
Each unit has its own warning bell, which rings for one second if a message is received or continuously if an urgent message is received. The warning bell can be silenced by utilizing the acknowledge function (described below).
Each unit possesses 6 control buttons, which are listed below:
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Power Button (PWR) | If the unit is unpowered/offline, the power button will begin the boot sequence. If the unit is online/powered, the power button will shut down the unit.,
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Restart Button (RSTRT) | For cases where the unit may not be responding or functioning as intended, a quick reboot button is provided. When activated, the device will restart by shutting down and automatically restarting the boot-up sequence.,
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Clear Messages (CLR) | If the unit memory becomes full (maximum 9 active messages displayed), a clear button is provided. The clear function will erase all existing messages from memory and will clear them from the display. Caution: use of the clear button will permanently erase all messages, and they will not be retrievable after clearing.,
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Acknowledge Previous Message (ACK) | The acknowledge function allows operators to quickly and efficiently deliver a message of acknowledgment to the last unit from which a message has been received. Pressing the acknowledge button after a message has been received will automatically send ‘ACKNOWLEDGED’ to the previous station. It will silence the warning bell if an urgent message has been received. If the receiving unit’s memory is full, or it is offline, an error message will be displayed.,
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Send Function (SEND) | The send function will send the currently prepared message to the intended receiving unit. The receiving unit’s warning bell will sound for 1 second, and the message will appear on its display. If the receiving unit activates its acknowledge function, the sending unit will receive an ‘ACKNOWLEDGED’ message (always of normal importance; I.e. never urgent).,
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Send Urgent Function (SEND URG) | Similar to the send function, the Send Urgent function will send the currently prepared message to the intended receiving unit, instead of marking it as an urgent message. Utilizing this function is normally identical to the Send Function, however, the receiving unit will automatically prefix the message with ‘!! URGENT !!’ and the warning bell will ring continuously until silenced.
Second EDG for Unit 2 & EDG Refueling
- A second EDG was added to Unit 2. Operators can control it remotely from the MCR or manually start it from the EDG bay. EDGs now have a more complex (and realistic) startup process and have to be refueled via the refueling system, also located in the EDG bay.
CRD Drive System
- The CRD (Control Rod Drive) system is now simulated in-game. CRD pumps are responsible for moving the control rods in and out of the reactor. Control rod pressure and tank levels need to be monitored to ensure the rods can be manipulated correctly.
LPR Monitoring System
- U2 has been retrofitted with an all-new Local Power Range Monitoring System to allow for a more in-depth experience by reading the local neutron flux of certain regions of the reactor with miniature fission chambers. Beware though, you can trip the unit by allowing local neutron flux in any region of the core to get too high so ensure you pay attention!
MSRV System
- MSRV (Main steam relief valve) controls have been added to the MCR and can be used as a way to vent steam (and therefore pressure) from the system.
Phone Call Logs
- Located in the supervisor room, phone calls are now logged and can be reviewed both for moderation and archival purposes.
Revamped Features
Annunciators & Annunciator Sounds
- All annunciators in the U2 MCR received new sounds. Additionally, new annunciators have been added around the MCR for multiple systems.
Recirculation Panel
All Unit 2 Reactor Modes
- All 4 reactor modes (stable, classic, self-circulating, RBMK) received some minor tweaking to accommodate the new system additions into the MCR.
ECCS/RHR System
- The RHR panel has undergone a complete overhaul and has been further integrated with the LPCI and RCIC turbine system; functionality should remain the same, bar a couple of new annunciators.
RPS Scram System
- Overhauled the scram system. Both RPS channels A and B are simulated, as well as two actual scram points. While it currently may seem basic, it was an essential backend overhaul to prepare for a future update… Stay tuned! See dropdown for detailed information regarding the RPS Logic.
RPS Logic
Trip Scheduling:
APRM Upscale: > 125%
APRM Downscale: < 3% in RUN mode
Low RPV Level: < -4m
LPRM Upscale: > 140% (> 160% for RBMK)
LPRM Low Period: < 15 Seconds
Offsite Power Loss: APRM > 50% & loss of offsite power
RPV Pressure: > 10MPa
Low Period: < 20 Seconds
RPS is a system that is responsible for tripping (initiating a SCRAM) when dangerous reactor conditions are approached. It features two channels, A and B, which are always energized (on). If an RPS channel trips, it becomes de-energized (unpowered). If both RPS channels trip simultaneously, the reactor will SCRAM.
The RPS annunciators are as follows:
- Reactor Trip State | Activates during reactor SCRAM
- Reactor Half Trip | Actives when ONE channel has tripped, but not both
- RPS Channel Trip A | Activates when RPS channel A has tripped
- RPS Channel Trip B | Actives when RPS channel B has tripped
- Various RPS annunciators | These activate when the reactor has tripped (BOTH RPS channels) based on their name; they essentially show the reactor trip reason.
The new Manual SCRAM buttons correspond to one RPS channel each (although there are two sets; they do the same thing). Pressing one will trip that RPS channel and the reactor will half-trip (a loud buzzer will continuously sound).
When an RPS channel trips, its respective trip buttons and annunciator will light up. The channel must be reset manually by using the buttons next to the Manual SCRAM buttons.
RPS channels may individually trip (half trip) if a condition is NEAR a trip threshold, but not met.
Example:
The reactor APRM is reading 123%. This in itself does not trip the reactor, but a sensor may return a slightly false value, causing only one RPS channel to trip. This must be promptly reset.
The chance of the reactor spontaneously half-tripping near trip thresholds is about 15% per second.
If the reactor trips, the RPS channels will be reset automatically once the SCRAM has been completed.
Pressing the buttons with all rods fully in will have no effect.
Weather Monitoring System
- The Weather Monitoring System has been rebuilt from the ground up and optimized by changing to Roblox EditableGuis allowing for a better weather forecasting system.
Select Gauges & Decals
- Numerous gauges in both the MCR and throughout the plant have been reworked or had their decals reworked for both aesthetic and functionality purposes.
Technology in U2 MCR
- Monitors in the MCR (such as the engineer’s screen, the demand screen, and the server configuration panel, to name a few) have been fully reworked and have been given a “retro” overhaul to better match the timeframe in which the MCR was constructed.
Moved Old U2 MCR Panels to Museum
- The old U2 panels were removed from the MCR down to the museum located on the first floor of the main plant building.
FCD Lights
FCD Lights
The lights on the full core display are simple and represent the following:
- Green | Illuminates when the respective control rod group is fully inserted into the reactor (FULL IN)
- Red | Illuminated when the respective control rod group is fully withdrawn from the reactor (FULL OUT)
- SCRAM | Illuminates when the reactor is currently undergoing a reactor trip state (REACTOR SCRAM)
AND SO MUCH MORE!