"TOKYO — First, a rat gnawed through exposed wiring, setting off a scramble to end yet another blackout of vital cooling systems at the Fukushima Daiichi nuclear plant. Then, hastily built pits for a flood of contaminated water sprang leaks themselves. Now, a new rush of radioactive water has breached a barrier built to stop it, allowing heavily contaminated water to spill daily into the Pacific."

"SEOUL, South Korea — Like Japan, resource-poor South Korea has long relied on nuclear power to provide the cheap electricity that helped build its miracle economy. For years, it met one-third of its electricity needs with nuclear power, similar to Japan’s level of dependence before the 2011 disaster at its Fukushima plant. Now, a snowballing scandal in South Korea about bribery and faked safety tests for critical plant equipment has highlighted yet another similarity: experts say both countries’ nuclear programs suffer from a culture of collusion that has undermined their safety."

"Highly radioactive water seeping into the ocean from Japan's crippled Fukushima nuclear plant is creating an 'emergency' that the operator is struggling to contain, an official from the country's nuclear watchdog said on Monday."

"Two and a half years after the worst nuclear disaster since Chernobyl, the operator of Japan's wrecked Fukushima plant faces a daunting array of unknowns."

"The operator of Japan's stricken Fukushima nuclear power plant said on Monday that contaminated ground water had likely been flowing into the sea, acknowledging such a leakage for the first time."

"As China pushes an aggressive expansion of nuclear power it is running into a major stumbling block - a breakdown of trust, post-Fukushima, in official assurances of public safety."

"OAK HARBOR, Ohio — Davis-Besse is identified in a new economic report as one of a dozen U.S. nuclear reactors most likely to be closed by their utilities before their licenses expire because of changing energy markets, including falling natural gas prices, rising costs of nuclear operations, repairs, and post-Fukushima retrofits."

"ST. PETERSBURG, Russia -- So much for the lessons of Fukushima. Never mind oil spills, the Russian Federation is preparing an energy initiative that, if it has problems, will inject nuclear material into the maritime environment."

"TOKYO — The operator of the Fukushima Daiichi nuclear power plant stood ready Thursday to inject boric acid into one of its most heavily damaged reactors after it found steam emanating from the reactor building. The preventive measure would stave off sustained nuclear reactions in the reactor’s damaged core, though officials stressed that such reactions were a remote possibility."

"Significant progress was made last year in strengthening nuclear safety around the world, the U.N. atomic watchdog said in its annual review, despite the 'challenge' posed by a large number of ageing reactors."

"Tokyo Electric Power Co. has started taking measures to contain highly radioactive groundwater at the Fukushima No. 1 nuclear plant, but its strategy is based on a theory that is disputed by industry experts."

"Its stock is sliding. Its economic future is in question. The company that operated and is now responsible for shutting down the Paducah nuclear fuel plant insists it will meet its obligations to safely and cleanly return the aging facility to its owner, the U.S. Department of Energy, next year."

"Japan's nuclear regulator says radioactive water from the crippled Fukushima power plant is probably leaking into the Pacific Ocean, a problem long suspected by experts but denied by the plant's operator."

"Nuclear and radioactive materials are still going missing and the information the United Nations atomic agency receives about such incidents may be the tip of the iceberg, said a senior U.N. official."

"WASHINGTON — As more nuclear reactors across the country are closed, the problem of what to do with their waste is becoming more urgent, government officials and private experts said at a conference here this week."