Rising water threatened the cooling system at the Oyster Creek nuclear plant, in Toms River, N.J., on Monday night. The plant declared an alert at 8:45 PM, which is the second-lowest level of the four-tier emergency scale established by the Nuclear Regulatory Commission.
The water level was more than six feet above normal. At seven feet, the plant would lose the ability to cool its spent fuel pool in the normal fashion, according to Neil Sheehan, a spokesman for the Nuclear Regulatory Commission.
The plant would probably have to switch to using fire hoses to pump in extra water to make up for evaporation, Mr. Sheehan said, because it could no longer pull water out of Barnegat Bay and circulate it through a heat exchanger, to cool the water in the pool.
Having first come online in 1969, Oyster Creek is the nation's oldest operating nuclear reactor, and is of the same design as those that failed at the Fukushima Daiichi plant. The reactor is located 50 miles east of Philadelphia and 75 miles south of New York City; 4.5 million people live within its 50-mile radius.
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Cs (Cesium) deposition and precipitation amount on 15 March. The cyclone produced a few millimeters of rain in areas on Honshu Island engulfed by the FD-NPP plume, which led to 137Cs washout. Precipitation was strongest (6mm) near FD-NPP, which produced particularly large deposition amounts of up to nearly 1000kBqm-2 in the vicinity of FD-NPP.
Our simulation suggests that this was the main deposition event over Japan for the entire duration of the disaster. It was due to an unfortunate combination of three factors: (1) the highest emissions of the entire duration of the accident occurred during 14–15 March, (2) the winds transported these emissions over Japan, and (3) precipitation occurred over eastern Japan. Luckily, it did not rain (also confirmed by radar data) exactly at the time when – according to our simulation – the highest concentrations were advected over Tokyo and other major Japanese cities. In such a disastrous scenario, much higher 137Cs deposition in the major population centers would have been possible.
The report, "Independent Investigation Commission on the Fukushima Daiichi Nuclear Accident," is based on interviews with more than 300 officials, utility executives and TEPCO employees. ... The report quotes Kan's chief Cabinet secretary, Yukio Edano, as experiencing a "demonic scenario in my head" in which four of the plant's six reactors exploded, setting off more explosions at a nearby plant, with massive releases of radiation, according to reports from Japan.
"If that happens, Tokyo will be finished," Edano recalled thinking at the time, according to the foundation report. Edano's public statements at the time did mentioned those fears.
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