Nuclear power generation

A man casts his shadow in the coal port of the Mehrum coal-fired power plant in the district of Peine in Hohenhameln, Germany, Wednesday, Jan. 15, 2020. Germany wants to gradually phase out the climate-damaging combustion of coal for electricity generation by 2038. ( Julian Stratenschulte/dpa via AP)

An emergency alert issued by the Canadian province of Ontario reporting an unspecified “incident” at a nuclear plant is shown on a smartphone Sunday, Jan. 12, 2020. Ontario Power Generation later sent a message saying the alert “was sent in error." The initial message said the incident had occurred at the Pickering Nuclear Generating Station, though it added there had been no abnormal release of radioactivity from the station. (AP Photo/Robert Gillies)

FILE - In this Dec. 23, 2019 file photo released by the Atomic Energy Organization of Iran, technicians work at the Arak heavy water reactor's secondary circuit, as officials and media visit the site, near Arak, Iran. Britain, France and Germany said Tuesday Jan. 14, 2020, they are triggering a dispute mechanism that is part of the nuclear deal with Iran over its failure to live up to terms of the pact. (Atomic Energy Organization of Iran via AP, File)

FILE - In this June 12, 2018, file photo, U.S. President Donald Trump, right, meets with North Korean leader Kim Jong Un on Sentosa Island, in Singapore. The U.S. strike that killed Iran’s top military commander may have had an indirect casualty: a diplomatic solution to denuclearizing North Korea. Experts say the escalation of tensions between Washington and Tehran will diminish already fading hopes for such an outcome and inspire North Korea’s decision-makers to tighten their hold on the weapons they see, perhaps correctly, as their strongest guarantee of survival. (AP Photo/Evan Vucci, File)

FILE - This March 11, 2012, file photo, shows three melted reactors, from left, Unit 1, Unit 2 and Unit 3 at Fukushima Dai-ichi nuclear power plant in Okuma, Fukushima prefecture, Japan. Japan revised a roadmap on Friday, Dec. 27, 2019, for the tsunami-wrecked Fukushima nuclear plant cleanup, further delaying the removal of thousands of spent fuel units that remain in cooling pools since the 2011 disaster. (Kyodo News via AP, File)

FILE - In this Nov. 12, 2014, file photo, a Tokyo Electric Power Co. (TEPCO) official wearing a radioactive protective gear stands in front of Advanced Liquid Processing Systems during a press tour at the Fukushima Dai-ichi nuclear power plant in Okuma, Fukushima Prefecture, northeastern Japan. Japan's economy and industry ministry has proposed gradually releasing or allowing to evaporate massive amounts of treated but still radioactive water at the tsunami-wrecked Fukushima nuclear plant. The proposal made Monday, Dec. 23, 2019, to a body of experts is the first time the ministry has narrowed down the options available to just releasing the water. (AP Photo/Shizuo Kambayashi, File)

Exterior view of the Muehleberg nuclear power plant in Muehleberg, Switzerland, Friday, 20 Dec. 2019. Switzerland is shutting down one of its oldest nuclear power plants after 47 years of operation. The Muehleberg Nuclear Power Plant near the capital Bern is being taken off the grid shortly after noon Friday. (Anthony Anex/Keystone via AP)

Pope Francis shakes hands with Matsuki Kamoshita as he meets with victims of the March 11, 2011 Fukushima nuclear plant disaster in northern Japan Monday, Nov. 25, 2019, in Tokyo, Japan. (AP Photo/Jae Hong)