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The “Race” to Resolve the Boiling Water Reactor Safety Limit Problem

, director, Nuclear Safety Project

General Electric (GE) informed the Nuclear Regulatory Commission (NRC) in March 2005 that its computer analyses of a depressurization event for boiling water reactors (BWRs) non-conservatively assumed the transient would be terminated by the automatic trips of the main turbine and reactor on high water level in the reactor vessel. GE’s updated computer studies revealed that one of four BWR safety limits could be violated before another automatic response terminated the event.

Over the ensuring decade-plus, owners of 28 of the 34 BWRs operating in the US applied for and received the NRC’s permission to fix the problem. But it’s not clear why the NRC allowed this known safety problem, which could allow nuclear fuel to become damaged, to linger for so long or why the other six BWRs have yet to resolve the problem. UCS has asked the NRC’s Inspector General to look into why and how the NRC tolerated this safety problem affecting so many reactors for so long. Read more >

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Japan’s Nuclear Hawks Could Block US-North Korean Agreement on Denuclearization

, China project manager and senior analyst

Momentum has been building for a productive meeting between President Trump and Kim Jung-un that could lead to an agreement on North Korean denuclearization. But after speaking with Japanese Prime Minister Shinzo Abe, Trump warned the world that he might cancel or walk out of the meeting if “it is not going to be fruitful.” Read more >

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Commendable Nuclear Safety Catch at the Susquehanna Nuclear Plant

, director, Nuclear Safety Project

The owner of the two boiling water reactors (BWRs) at the Susquehanna Steam Electric Station in northeastern Pennsylvania notified the Nuclear Regulatory Commission (NRC) on April 2, 2018, that workers’ mistakes rendered an emergency core cooling system on Unit 1 vulnerable to being disabled by an earthquake at the same time that another emergency core cooling system was out of service for work on its power supply system. This is good news—not in having two safety systems impaired while the reactor operated, but in how quickly the problem was detected and corrected. Read more >

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Nuclear Regulatory Commission SAGging?

, director, Nuclear Safety Project

The Screen Actors Guild (SAG) is part of a labor union that represents nearly 160,000 actors and others in America. I don’t know how many NRC senior managers are SAG members, but with more and more individuals acting as senior managers for longer and longer periods, SAG may need to open an office in Rockville, Maryland where NRC is headquartered. Read more >

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