No, Not Pressing AZ-5 Would Not Save Chernobyl - Nuclear Engineer Reacts to That Chernobyl Guy

No, Not Pressing AZ-5 Would Not Save Chernobyl - Nuclear Engineer Reacts to That Chernobyl Guy

by T. Folse Nuclear

Applied Sciences & Engineering Energy THEnergy technology and engineeringTHKNuclear power and engineering
🎙 T. Folse Nuclear 👥 1.4M 📅 January 12, 2026 ⏱ 25 min 👁 395K 📄 expert opinion 🧭 2026-08-16
Available in: English (current) Français

Keywords

ChernobylAZ-5RBMKvoid coefficientreactor safety

Summary

In this reaction video, nuclear engineer Tyler Folse analyzes a video by ‘That Chernobyl Guy’ that explores the hypothetical scenario of not pressing the AZ-5 button at Chernobyl. Folse argues that the accident was not caused by the AZ-5 press but by a combination of design flaws and operational violations. He explains the positive void coefficient, the reactor’s instability at low power, and the insufficient shutdown margin. He reviews two hypothetical scenarios: one where the reactor stabilizes and another where it experiences a smaller power surge, but concludes that an automatic scram would likely have occurred anyway, leading to a similar outcome. Folse emphasizes that the real lesson is the violation of defense-in-depth and the need for fundamental design improvements, not blaming a single action. He provides technical insights into reactor physics, control rod behavior, and safety principles, ultimately concluding that not pressing AZ-5 would not have saved Chernobyl.

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Critical Evaluation

Value of the Information & Strength of the Argument

The video provides valuable insights into nuclear reactor physics and the Chernobyl accident, correcting common misconceptions. The argumentation is solid, based on the engineer’s professional experience and technical knowledge. He systematically deconstructs the hypothetical scenario, explaining why the reactor was already in an unstable state and why the AZ-5 press was not the root cause. He uses clear analogies and references to reactor safety principles, making the technical content accessible. The analysis is well-structured, addressing both the immediate cause and the deeper systemic issues.

Scientific Rigor, Source Quality, Title Accuracy

The video demonstrates scientific rigor by referencing reactor physics concepts, safety principles, and historical data. The engineer cites his own experience and mentions a scientific paper from 1988, but does not provide specific citations. The title accurately reflects the content, and the video stays on topic. The reaction format allows for expert commentary, but the reliance on the original video’s model may introduce uncertainties. Overall, the sources are credible, but the lack of explicit references limits verifiability.

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Title / Content Match

The title accurately reflects the content: the engineer refutes the claim that not pressing AZ-5 would have saved Chernobyl, providing a detailed technical analysis.

Quality & Reliability

8/10

The video is presented by a nuclear engineer with over 10 years of commercial nuclear power experience, providing expert analysis. The content is technically accurate, referencing reactor physics principles and historical data. However, it is a reaction video, and the analysis is based on the original creator's model, which may have limitations. The engineer's expertise lends credibility, but the format limits depth.

Key Moments

Markers derived by PSI from the transcript: the creator did not define chapters.

Cited Sources

Concurring Sources

  • INSAG-7: The Chernobyl Accident — IAEA report confirming the role of design flaws and operator errors.

Dissenting Sources

Contribution & Novelties

The video provides a unique expert perspective on the Chernobyl disaster, debunking the myth that not pressing AZ-5 would have saved the reactor. It offers a detailed technical analysis of the reactor’s instability and the role of design flaws. The engineer’s professional experience adds credibility and practical insights.

Pour aller plus loin :

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Radar Profile

The radar profile shows high scores in quality of information and technical level, reflecting the expert analysis. The quantity of information is also high, but the overall reliability is slightly lower due to the reaction format and reliance on the original video's model.

Reliability 8/10

💬 Très positif. Sur les 30 commentaires analysés, les spectateurs expriment un fort enthousiasme pour la collaboration entre les deux chaînes et saluent la qualité de l'analyse technique, avec des commentaires comme 'Finally! He's finally doing one the That Chernobyl Guy videos' et 'This is thrilling to watch'.