1977 - A1 CANDU Nuclear Power Plant at Jaslovské Bohunice, Czechoslovakia, Melted Down - Fatal Defect Revealed

Video about this meltdown.. not in english, sorry.

According to Wikipedia; The "A1 plant, (a civilian nuclear power plant) at Jaslovské Bohunice, Czechoslovakia, melted down in 1977. 

The decision to build a nuclear power plant in Czechoslovakia was made in 1956. Construction of A-1 in Jaslovské Bohunice (western Slovakia) started in 1958 and took an unexpected 16 years. A-1 was commissioned on October 24, 1972.[1]

REACTOR DESIGN EXPERIMENTAL, TURNED INTO A FAILURE, MORE REACTORS CANCELLED

The KS 150 reactor was designed in the Soviet Union and built entirely in Czechoslovakia, by Škoda Works. This type of reactor had never been deployed before. One advantage of the design was its ability to use unenriched uranium mined in Czechoslovakia, similar to a CANDU reactor. 

Because of its experimental design the power plant suffered from accidents resulting in over 30 unplanned shutdowns. On January 5, 1976 two workers were killed due to a leak of carbon dioxide, which was used as a coolant. A 'technical' (mechanical?) failure occurred during refueling and a fresh fuel assembly was shot off the reactor into the reactor's hall.[1] The most serious accident from 1977 (see below) was rated INES-4. The damage could have been repaired with a large investment but on May 17, 1979 the government, dissatisfied with high costs, low performance and accidents, decided to decommission the plant. Plans to build the second reactor block A-2 were canceled.

NUCLEAR REACTOR ACCIDENTS WERE KEPT SECRET

The accidents were kept secret.... 

On February 22, 1977, during a fuel change, a combination of human mistakes and design problems caused the worst nuclear accident in Czechoslovakian history. Some fuel rods were being replaced while the reactor was active in a standard procedure. In this instance however humidity absorbers covering the rods were not removed, causing local overheating of the fuel (since transmission of heat to the coolant gas was reduced). The active zone was damaged, heavy water got in contact with the coolant and both primary and secondary circuits were contaminated. 

The accident was rated as level 4 on International Nuclear Event Scale."

Source: http://en.wikipedia.org/wiki/KS_150

Around the facility 1011 Bq and 109 Bq of radioactive iodine were measured in the air. 11 km north of EBO 480 Bq/kg Cs-137 was found in grass and 407 Bq/kg of iodine-131 was found in corn. On the 22nd of February 1976 this nuclear power plant become another casualty of melting fuel.

http://www.greenpeace.org/slovakia/sk/kampane/Energia/Jadrova-energia/Jadrove-havarie/Jaslovske-Bohunice-A1/

CANDU REACTORS USE HIGHLY RADIOACTIVE, HIGHLY VOLATILE NUCLEAR FUEL

Part of the problem with CANDU reactors is that they use highly radioactive, highly volatile fuel. Normal reactors use fresh uranium rods wrapped in zirconium. They can be handled safely, are not radioactive and do not need physical cooling until after they have been 'burned' up in a reactor. 

CANDU reactor fuel needs to be handled remotely. They are very hot both radioactively and physically. They need to be kept cool at all times especially when bundled together, or they may melt down and out. The FRESH MOX fuel did melt out at unit number 4 equipment pool at Fukushima, after the 3/11 disaster after the equipment pool containing fresh MOX fuel dried out. 

AGreenRoad - TEPCO/Fukushima Lies Exposed Around Building #4, SFP, Core. Equipment Pool, Melt Out; via @AGreenRoad
http://agreenroad.blogspot.com/2013/12/agreenroad-tepcofukushima-lies-exposed.html

Spent Fuel Pool #4 Allegedly Being 'Unloaded' By TEPCO Nov. 2013, The Coverup Continues; via @AGreenRoad
http://agreenroad.blogspot.com/2013/11/spent-fuel-pool-4-allegedly-being.html

"A further complication is the loading of highly radioactive DUPIC fuel into the CANDU reactor."
http://www.world-nuclear.org/info/Nuclear-Fuel-Cycle/Fuel-Recycling/Processing-of-Used-Nuclear-Fuel/

Of course, no one in the pro nuclear industry wants the world to know how dangerous this 'new' type of MOX or CANDU fuel is, so all of this is kept hush hush and very quiet. The pro nucleocrats either deny accidents happen with this new deadly, very volatile fuel, or they minimize any accidents and melting fuel rods, so that the accident does not sound like a melt down at all.

CANDU REACTOR SUFFER FROM DANGEROUS POWER PULSES THAT PUT THEM AT RISK OF MELTDOWN OR EXPLOSION, MUCH LIKE CHERNOBYL

Via Jebus November 23, 2014  "Reactor design puts safety of nuclear plants into question

Canadian nuclear safety regulators say they have underestimated the seriousness of a design feature at the country's electricity-producing reactors that would cause them to experience dangerous power pulses during a major accident. If reactors are not shut down quickly, their ability to keep radioactivity from escaping would be put to the test, according to an internal commission document.

The document says Canada's seven nuclear stations, which all use Candu technology, have a feature known as "positive reactivity feedback," in which their atomic chain reactions automatically speed up if the water pumped into the reactors to cool them leaks, one of the worst accidents possible at a nuclear station. If reactors aren't immediately shut down during this type of incident, positive reactivity leads to a quick snowballing in the pace of nuclear reactions, which in turn could cause potentially damaging overheating."

http://www.theglobeandmail.com/news/national/reactor-design-puts-safety-into-question/article4279995/

Risks of the CANDU reactor design
http://www.joint-project.org/upload/file/Risks_associated_with_CANDU_reactors.pdf

End

1977 - A1 CANDU Nuclear Power Plant at Jaslovské Bohunice, Czechoslovakia, Melted Down - Fatal Defect Revealed
http://agreenroad.blogspot.com/2014/04/1977-a1-nuclear-power-plant-at.html