April 26, 2014 archive

Cross posted from The Stars Hollow Gazette

This is your morning Open Thread. Pour your favorite beverage and review the past and comment on the future.

Find the past “On This Day in History” here.

April 26 is the 116th day of the year (117th in leap years) in the Gregorian calendar. There are 249 days remaining until the end of the year.

On this day in 1986, the world’s worst nuclear power plant accident occurs at the Chernobyl nuclear power station in the Soviet Union. Thirty-two people died and dozens more suffered radiation burns in the opening days of the crisis, but only after Swedish authorities reported the fallout did Soviet authorities reluctantly admit that an accident had occurred.

The Chernobyl disaster was a nuclear accident that occurred on 26 April 1986 at the Chernobyl Nuclear Power Plant in the Ukrainian SSR (now Ukraine). An explosion and fire released large quantities of radioactive contamination into the atmosphere, which spread over much of Western Russia and Europe. It is considered the worst nuclear power plant accident in history, and is one of only two classified as a level 7 event on the International Nuclear Event Scale (the other being the Fukushima I nuclear incident, which is considered far less serious and has caused no direct deaths). The battle to contain the contamination and avert a greater catastrophe ultimately involved over 500,000 workers and cost an estimated 18 billion rubles, crippling the Soviet economy.

The disaster began during a systems test on 26 April 1986 at reactor number four of the Chernobyl plant, which is near the town of Pripyat. There was a sudden power output surge, and when an emergency shutdown was attempted, a more extreme spike in power output occurred, which led to a reactor vessel rupture and a series of explosions. These events exposed the graphite moderator of the reactor to air, causing it to ignite. The resulting fire sent a plume of highly radioactive smoke fallout into the atmosphere and over an extensive geographical area, including Pripyat. The plume drifted over large parts of the western Soviet Union and Europe. From 1986 to 2000, 350,400 people were evacuated and resettled from the most severely contaminated areas of Belarus, Russia, and Ukraine. According to official post-Soviet data, about 60% of the fallout landed in Belarus.

The accident raised concerns about the safety of the Soviet nuclear power industry, as well as nuclear power in general, slowing its expansion for a number of years and forcing the Soviet government to become less secretive about its procedures.

(Click on image to enlarge) Russia, Ukraine, and Belarus have been burdened with the continuing and substantial decontamination and health care costs of the Chernobyl accident. Thirty one deaths are directly attributed to the accident, all among the reactor staff and emergency workers. A UNSCEAR report places the total confirmed deaths from radiation at 64 as of 2008. Estimates of the number of deaths potentially resulting from the accident vary enormously: the World Health Organization (WHO) suggest it could reach 4,000; a Greenpeace report puts this figure at 200,000 or more; a Russian publication, Chernobyl, concludes that 985,000 excess deaths occurred between 1986 and 2004 as a result of radioactive contamination.

Decommissioning

After the explosion at reactor four, the remaining three reactors at the power plant continued to operate. In 1991, reactor two suffered a major fire, and was subsequently decommissioned. In November 1996, reactor one was shut down, followed by reactor three on December 15, 2000, making good on a promise by Ukrainian president Leonid Kuchma that the entire plant would be closed.

Even after the last reactor shutdown, people continue to work at the Chernobyl plant until reactor units 1, 2, and 3 are totally decommissioned, which is expected to take years. The first stage of decommissioning is the removal of the highly radioactive spent nuclear fuel, which is placed in deep water cooling ponds. However, storage facilities for this are not suitable for long term containment, and those on site do not have the capacity for all the spent fuel from units 1, 2 and 3. A second facility is planned for construction that will use dry storage technology suitable for long term storage and have the required capacity.

Removal of uncontaminated equipment has begun at unit 1 and this work could be complete by 2020-2022.

The remains of reactor unit 4 will remain radioactive for some time. The isotope responsible for the majority of the external gamma radiation dose at the site is Caesium-137 which has a half-life of about 30 years. It is likely that with no further decontamination work the gamma ray dosage at the site will return to background levels in about three hundred years. However, as most of the alpha emitters are longer lived, the soil and many surfaces in and around the plant are likely to be contaminated with transuranic metals such as plutonium and americium, which have much longer half-lives. It is planned that the reactor buildings will be disassembled as soon as it is radiologically safe to do so.

Welcome to the Health and Fitness News, a weekly diary which is cross-posted from The Stars Hollow Gazette. It is open for discussion about health related issues including diet, exercise, health and health care issues, as well as, tips on what you can do when there is a medical emergency. Also an opportunity to share and exchange your favorite healthy recipes.

Questions are encouraged and I will answer to the best of my ability. If I can’t, I will try to steer you in the right direction. Naturally, I cannot give individual medical advice for personal health issues. I can give you information about medical conditions and the current treatments available.

You can now find past Health and Fitness News diaries here and on the right hand side of the Front Page.

The Hass avocados I’ve been working with lately are nutty and rich, and I’ve been doing a lot more than slicing them up for sandwiches and mashing them for guacamole. I’ve been blending them with tomatillos and chiles into creamy salsas, and making surprising salads. One of them is a Chilean cabbage slaw that the chef Iliana de la Vega made at the recent “Healthy Kitchens, Healthy Lives” conference at the Culinary Institute of America in Napa Valley. That was a revelation – coleslaw meets guacamole, two of my favorite dishes rolled into one.

Although we are now seeing studies showing that saturated fats might not be so bad after all, I hesitate to say that avocados are filled with “good fats.” But the fact is, they are. The fats in avocados, which include a generous amount of a monounsaturated fatty acid called oleic acid, aid in the absorption not only of their own many fat-soluble phytonutrients, including antioxidants such as alpha- and beta-carotene and lutein, but also the nutrients in the foods you combine avocados with.

~Martha Rose Shulman~