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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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North Korea’s Next Test?

, China project manager and senior analyst

North Korean Foreign Minister Ri Yong Ho warned reporters in New York that his country may place a live nuclear warhead on one of its missiles, launch it, and then detonate the bomb in the open air.

It would not be the first time a country conducted such a test. The Soviet Union did it in 1956, The United States did it in 1962. But perhaps the most relevant historical precedent is the Chinese test in 1966. Read more >

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North Korea’s Sept. 15 Missile Launch over Japan

, co-director and senior scientist

North Korea conducted another missile test at 6:30 am September 15 Korean time (early evening on September 14 in the US). Like the August 28 test, this test appears to have been a Hwasong-12 missile launched from a site near the Pyongyang airport. The missile followed a standard trajectory—rather than the highly lofted trajectories North Korea used earlier this year—and it flew over part of the northern Japanese island of Hokkaido (Fig. 1). 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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