Nuclear Power Safety

The probability of a nuclear accident is small but the consequences can be catastrophic. Our experts analyze nuclear safety issues from the past and present, making recommendations for a safer nuclear fleet.


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Latest Nuclear Power Safety Posts

Update: Turkey Point Fire and Explosion

, director, Nuclear Safety Project

An earlier commentary described how workers installing a fire retardant wrap around electrical cables inside Switchgear Room 3A at the Turkey Point nuclear plant in Florida inadvertently triggered an explosion and fire that blew open the fire door between the room and adjacent Switchgear Room 3B.

I submitted a request under the Freedom of Information Act (FOIA) for all pictures and videos obtained by the special inspection team dispatched by the NRC to Turkey Point to investigate this event. The NRC provide me 70 color pictures in response to my request. This post updates the earlier commentary with some of those pictures. Read more >

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Why NRC Nuclear Safety Inspections are Necessary: Indian Point

, director, Nuclear Safety Project

This is the second in a series of commentaries about the vital role nuclear safety inspections conducted by the Nuclear Regulatory Commission (NRC) play in protecting the public. The initial commentary described how NRC inspectors discovered that limits on the maximum allowable control room air temperature at the Columbia Generating Station in Washington had been improperly relaxed by the plant’s owner. This commentary describes a more recent finding by NRC inspectors about an improper safety assessment of a leaking cooling water system pipe on Entergy’s Unit 3 reactor at Indian Point outside New York City. Read more >

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Why NRC Nuclear Safety Inspections are Necessary: Columbia Generating Station

, director, Nuclear Safety Project

The Nuclear Regulatory Commission (NRC) adopted its Reactor Oversight Process (ROP) in 2000. The ROP is far superior to the oversight processes previously employed by the NRC. Among its many virtues, the NRC treats the ROP as a work in progress, meaning that agency routinely re-assesses the ROP and makes necessary adjustments.

Earlier this year, the NRC initiated a formal review of its engineering inspections with the goal of making them more efficient and more effective. During a public meeting on October 11, 2017, the NRC working group conducting the review outlined some changes to the engineering inspections that would essentially cover the same ground but with an estimated 8 to 15 percent reduction in person-hours (the engineering inspections and suggested revisions are listed on slide 7 of the NRC’s presentation). Basically, the NRC working group suggested repackaging the inspections so as to be able to examine the same number of items, but in fewer inspection trips.

The nuclear industry sees a different way to accomplish the efficiency and effectiveness gains sought by the NRC’s review effort—they propose to eliminate the NRC’s engineering inspections and replace them with self-assessments. The industry would mail the results from the self-assessments to the NRC for their reading pleasure. Read more >

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Nuclear Plant Risk Studies: Then and Now

, director, Nuclear Safety Project

Nuclear plant risk studies (also called probabilistic risk assessments) examine postulated events like earthquakes, pipe ruptures, power losses, fires, etc. and the array of safety components installed to prevent reactor core damage. Results from nuclear plant risk studies are used to prioritize inspection and testing resources–components with greater risk significance get more attention. Read more >

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Tennessee Valley Authority’s Nuclear Safety Culture Déjà vu

, director, Nuclear Safety Project

The Nuclear Regulatory Commission (NRC) issued a Confirmatory Order to the Tennessee Valley Authority (TVA) on July 27, 2017.  An NRC team inspecting the Watts Bar Nuclear Plant in fall 2016 determined that TVA failed to comply with elements of another Confirmatory Order that NRC had issued to TVA on December 22, 2009. Specifically, the 2009 Confirmatory Action required TVA to implement measures at all its nuclear plant sites (i.e., Watts Bar and Sequoyah in Tennessee and Browns Ferry in Alabama) to ensure that adverse employment actions against workers conformed to the NRC’s employee protection regulations and whether the actions could negatively impact the safety conscious work environment. The NRC inspection team determined that TVA was not implementing several of the ordered measures at Watts Bar. Read more >

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