susquehanna


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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UCS Causes Meltdowns at US Nuclear Reactors (no, really)

, director, Nuclear Safety Project

Disaster by Design/ Safety by Intent #46

Disaster by Design

You won’t see it on our website. You won’t find it in materials we mail out to our members. You won’t hear it in the webinars we hold for prospective donors. But UCS caused a meltdown at a U.S. nuclear power reactor. Well, that’s only half the story. UCS caused meltdowns at two U.S. nuclear power reactors. In our defense, they (being the Nuclear Regulatory Commission (NRC) and the nuclear industry, started it. We only finished it. Read more >

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Nuclear Plant Containment Failure: Isolation Devices

, director, Nuclear Safety Project

Disaster by Design/Safety by Intent #32

Disaster by Design

Containment structures at nuclear power plants have multiple purposes. Containments protect vital safety equipment from damage caused from external events like high winds and the debris they can fling. And containments protect nearby communities against radiation released from reactor cores damaged during accidents. Read more >

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Severe Accident Management Guidelines for Nuclear Plants

, director, Nuclear Safety Project

Disaster by Design/Safety by Intent #22

Disaster by Design

The March 1979 accident at the Three Mile Island nuclear plant near Harrisburg, Pennsylvania showed that the procedures used by workers in responding to accidents could be significantly improved. Read more >

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When Safety Relief Valves Fail to Provide Safety or Relief at Nuclear Plants

, director, Nuclear Safety Project

Disaster by Design: Safety by Intent #6

Disaster by Design

The light water reactors currently operating in the U.S. are either boiling water reactors (BWRs) or pressurized water reactors (PWRs). In both designs, water flowing past the nuclear fuel in the reactor cores gets heated to over 500°F. Water is able to be heated to this temperature because it is pressurized—to over 1,000 pounds per square inch (psi) in BWRs and to over 2,000 psi in PWRs. The 1,000 psi pressure is equivalent to the pressure submerged more than 2,200 feet below the ocean’s surface. Read more >

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