Sunday, April 26, at 1:23 a.m. local time will mark 40 years since the most severe nuclear accident in history: the meltdown of Unit 4 at the Chernobyl nuclear power plant in Ukraine, then part of the Soviet Union.

A clarification: While it is accurate to call the accident at Chernobyl a meltdown, it is important to understand the fundamental difference between it and the accidents at Fukushima Daiichi and Three Mile Island. As you will read below, the accident at Chernobyl was a catastrophic, reactivity-induced meltdown that unfolded in a matter of seconds and minutes. In contrast, the gradual loss-of-coolant-induced meltdowns at both Fukushima and TMI unfolded over the course of hours and were orders of magnitude less destructive by every conceivable metric.

In the ensuing four decades, countless books, documentaries, articles, and conference sessions have examined Chernobyl’s history and impact from various angles. There is a similar abundance of outlooks in the archives of Nuclear News, where hundreds of scientists, advocates, critics, and politicians have shared their thoughts on Chernobyl over the years. Today, we will take a look at some highlights from the pages of NN to see how the story of Chernobyl evolved over the decades.

Gago

The governing board of the World Association of Nuclear Operators has appointed José Gago as the new WANO chair. He was formerly the general manager and chief executive officer of the Asociacion Nuclear Asco-Vandellos (ANAV) in Spain.

Gago will succeed the current chair, Tom Mitchell, on March 1, 2025, after Mitchell completes his full six-year term in the role.

Background: Gago has been ANAV’s governor at the WANO Paris Centre’s governing board since 2012 and was elected its chairperson in 2020. He has been the president of the Spanish Nuclear Society and a member of the Foro Nuclear board of directors, and he has kept close contact with the nuclear industry, serving on several advisory boards and participating in the International Atomic Energy Agency expert missions.

Nuclear powerhouse Constellation announced today the signing of a 20-year power purchase agreement with Microsoft that will pave the way for the restart of Three Mile Island Unit 1—under a new name to honor Chris Crane, former chief executive of Exelon when Constellation was part of the larger company.

Pate

Zack T. Pate, the former chief executive officer of the Institute of Nuclear Power Operations (INPO) and chair of the World Association of Nuclear Operators (WANO), passed away recently at the age of 86. Pate will be remembered for his many important contributions to the global nuclear energy industry, especially regarding nuclear plant performance and safety, as well as his lengthy service in the U.S. Navy. He was a longtime member of the American Nuclear Society.

Navy: Pate was originally from Leesburg, Ga. He graduated from the United States Naval Academy in 1958 and continued to serve with distinction in the navy for 22 years, working on several nuclear submarines and reaching the rank of captain. He was executive officer of the USS Thomas Jefferson and commander of the USS Sunfish.