google-site-verification=Bi5tI8WZLmgLQCt3p-aIw8z5CkJAHeD9rrURuZtohHM Chernobyl (Part 5) - Human Factors Minute

Episode 53

Chernobyl (Part 5)

...and now for another Human Factors Minute! Highly-trained and experienced operators can often compensate for a poor design; however, in the case of the Chernobyl disaster, the designers gave the operators too difficult a task. The design was not at all forgiving of operator mistakes. It may have been difficult for the operators to have compensated for design failures that they did not know about. Not only were the plant operators unaware of key design weaknesses, the designers were unaware as well. One example is the material used in the control rods. Control rods made of boron are lowered into the reactor core to slow the nuclear reaction. However, the tip of the control rods at Chernobyl were made of graphite, which temporarily increase the reaction as they enter the core. The emergency AZ-5 button reinserts all of the control rods, which shuts down the reaction. When this button was pressed as a last resort, the large number of descending graphite tips led to a huge surge in reactor power. Then, as parts of the system ruptured, the control rods were blocked from moving further down and so the graphite tips continued to accelerate the reaction, leading to the inevitable explosion. The operators at Chernobyl were under the impression that the AZ-5 button was a fail-safe shut-down. They were not aware of this design flaw. If they had understood, it may have influenced some of their decisions. To this day, some major companies continue to blame control room operators, pilots, train drivers and offshore drillers, rather than explore design issues or leadership behaviours that set these staff up to fail. The Chernobyl plant wasn’t just operated by humans, it was also designed by humans; and all humans can make mistakes. This has been another Human Factors Minute! Be sure to check out our main show at our official website: Support us on these platforms to get access to the entire Human Factors Minute library: Patreon: Buy us a coffee: Join us on Discord: Follow us: Human Factors Cast Merchandise Store: Follow us on Twitch: Follow us on YouTube: Follow us on LinkedIn: Follow us on Twitter: Follow us on Facebook: Resources: Music by Kevin McLeod:

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Human Factors Minute
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About your host

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Nick Roome

Nick is currently a Senior UX Researcher at Turvo in the Pacific Northwest, focused on developing innovative solutions and optimizing human performance for SaaS based supply chain logistics programs. Alongside colleague and friends, Blake Arnsdorff and Barry Kirby, Nick hosts and produces Human Factors Cast, a weekly podcast that investigates the sciences of human factors, psychology, engineering, biomechanics, industrial design, physiology and anthropometry and how it affects our interaction with technology. Nick’s other areas of interest include, but are not limited to virtual, augmented, and mixed reality, systems engineering, and artificially intelligent systems.

Nick Started Human Factors Cast in early 2016 as a side-project. He believed that the way Human Factors concepts were being communicated is broken and saw a way to fix it. After getting initial traction, Nick moved to work on the Human Factors Cast Digital Media Lab and began assembling a multi-disciplinary team to test out new concepts in Human Factors communication.