It collapsed Destroying the bulkheads between the first three compartments and all the decks , tore Destroying a large hole in the hull , destroyed Destroying compartments four and five , and killed Killing everyone still alive forward of the nuclear reactor in the fifth compartment .

The nuclear reactors shut down Being_in_operation safely .

The Office of Atomic Energy for Peace ( OAEP ) , Thailand 's nuclear regulatory agency , was notified Telling when doctors came to suspect Suspicion radiation injury , some seventeen days after the initial exposure .

The Chernobyl disaster Catastrophe was a nuclear accident Catastrophe that occurred Presence on 26 April 1986 at the No .

4 nuclear reactor in the Chernobyl Nuclear Power Plant , near the city of Pripyat in the north of the Ukrainian Soviet Socialist Republic .

It is considered the worst nuclear disaster Catastrophe in history and is one of only two nuclear energy disasters Catastrophe rated at seven—the maximum severity—on the International Nuclear Event Scale , the other being the 2011 Fukushima Daiichi nuclear disaster Catastrophe in Japan .

It is considered the worst nuclear disaster Catastrophe in history and is one of only two nuclear energy disasters Catastrophe rated at seven—the maximum severity—on the International Nuclear Event Scale , the other being the 2011 Fukushima Daiichi nuclear disaster Catastrophe in Japan .

It is considered the worst nuclear disaster Catastrophe in history and is one of only two nuclear energy disasters Catastrophe rated at seven—the maximum severity—on the International Nuclear Event Scale , the other being the 2011 Fukushima Daiichi nuclear disaster Catastrophe in Japan .

The accident Catastrophe started Process_start during a safety test Testing on an RBMK-type nuclear reactor , which was commonly used Using throughout the Soviet Union .

This operating Being_in_operation gap was about one minute and had been identified Check as a potential safety problem that could cause Causation the nuclear reactor core to overheat Destroying .

The test Testing supervisor then failed to follow procedure , creating Creating unstable operating Being_in_operation conditions that , combined Cause_to_amalgamate with inherent RBMK reactor design flaws and the intentional disabling Destroying of several nuclear reactor safety systems , resulted in Causation an uncontrolled nuclear chain reaction .

The test Testing supervisor then failed to follow procedure , creating Creating unstable operating Being_in_operation conditions that , combined Cause_to_amalgamate with inherent RBMK reactor design flaws and the intentional disabling Destroying of several nuclear reactor safety systems , resulted in Causation an uncontrolled nuclear chain reaction .

The Chernobyl disaster Catastrophe is considered the worst nuclear power plant accident in history , both in terms of cost Cost and casualties Catastrophe .

The U.S. then constructed airfields on Saipan and Tinian where B-29s were based to conduct strategic bombing missions against the Japanese mainland until the end of World War II , including the nuclear attacks on Hiroshima and Nagasaki .

The conflict is bound in the political struggle of Iranian leadership against Israel and its declared Expressing_publicly aim to dissolve the Jewish state , with the counter aim Aiming of Israel to prevent Preventing_or_letting nuclear weapons being acquired Getting by the Iranian government and downgrading Cause_change_of_position_on_a_scale its allies and proxies such as the Lebanese Hezbollah party .

According to Mossad chief Yossi Cohen , `` As long as the current regime exists , with the nuclear agreement or without it , Iran will continue to serve Assistance as the main threat to Israel 's security '' .

It is also one of the very few instances of direct , conventional warfare between nuclear states ( i.e. , those possessing nuclear weapons ) .

It is also one of the very few instances of direct , conventional warfare between nuclear states ( i.e. , those possessing nuclear weapons ) .

India had conducted Action its first successful test in 1974 ; Pakistan , which had been developing Cause_to_make_progress its nuclear capability in secret since around the same time , conducted Action its first known tests in 1998 , just two weeks after a second series of tests by India .

According to Blair , the trigger Causation was Iraq 's failure Earnings_and_losses to take Getting a `` final Process_end opportunity '' to disarm Removing itself of alleged Statement nuclear , chemical , and biological weapons that U.S. and British officials called an immediate and intolerable threat Catastrophe to world peace .

It was the most significant accident in U.S. commercial nuclear power plant history .

The accident began Process_start with failures in the non-nuclear secondary system , followed Motion by a stuck-open pilot-operated relief valve in the primary system , which allowed large amounts of nuclear reactor coolant to escape .

The accident crystallized Change anti-nuclear safety concerns among activists and the general public , and resulted in Causation new regulations for the nuclear industry .

Operation Redwing was a United States series of 17 nuclear test Testing detonations from May to July 1956 .

Fission , primarily `` fast '' fission of the natural uranium tamper surrounding Surrounding the fusion capsule , greatly increases Cause_change_of_position_on_a_scale the yield of thermonuclear devices , and constitutes the great majority of the fallout , as nuclear fusion is a relatively clean reaction .

operation blowdown was an explosives test Testing carried out Military_operation in the iron range jungle of australia 's cape york peninsula in 1963 , to simulate Hold the effects of a nuclear weapon on tropical rainforest .

although never officially stated Statement , there is speculation Coming_to_believe that the test intended to determine Deciding the feasibility of using Using nuclear weapons in clearing the jungles of vietnam , at a time of australia 's increasing involvement in the vietnam war starting in 1962 .

Operation Grapple was the name of four series of British nuclear weapons tests Testing of early atomic bombs and hydrogen bombs Attack carried out Action in 1957 and 1958 at Malden Island and Kiritimati ( Christmas Island ) in the Pacific Ocean as part of the British hydrogen bomb programme .

nine nuclear explosions were initiated Process_start , culminating in the united kingdom becoming Becoming the third recognised possessor of thermonuclear weapons , and the restoration of the nuclear special relationship with the united states with the 1958 us-uk mutual defence Defending agreement .

nine nuclear explosions were initiated Process_start , culminating in the united kingdom becoming Becoming the third recognised possessor of thermonuclear weapons , and the restoration of the nuclear special relationship with the united states with the 1958 us-uk mutual defence Defending agreement .

During the Second World War , Britain had a nuclear weapons project , codenamed Tube Alloys , which was merged Cause_to_amalgamate with the American Manhattan Project in August 1943 .

The successful test Testing of an atomic bomb in Operation Hurricane in October 1952 represented an extraordinary scientific and technological achievement , but Britain was still several years behind the United States in nuclear weapons technology .

This was a true hydrogen bomb , but most of the yield came from nuclear fission rather than nuclear fusion .

This was a true hydrogen bomb , but most of the yield came from nuclear fission rather than nuclear fusion .

With an explosive yield of about , it remains Presence the largest British nuclear weapon ever tested Testing .

A final series of four tests Testing in August and September 1958 , known as Grapple Z , tested Testing techniques for boosting Cause_to_make_progress and making Manufacturing bombs immune to predetonation caused Causation by nearby nuclear explosions .

Operation Military_operation Wigwam involved Participation a single test Testing of the Mark 90 Betty nuclear bomb .

The purpose Aiming of `` Wigwam '' was to determine Deciding the vulnerability of submarines to deeply detonated Attack nuclear weapons , and to evaluate the feasibility of using such weapons in a combat situation .

Detonated Attack on March 1 , 1954 , the device was the most powerful nuclear device detonated Attack by the United States and its first lithium deuteride fueled Supply thermonuclear weapon .

For a time , geopolitical events Confronting_problem and natural disasters Catastrophe had strong short-term effects Influence on oil prices Cost , such as North Korean missile tests Testing , the 2006 conflict Hostile_encounter between Israel and Lebanon , worries over Iranian nuclear plans Arranging in 2006 , Hurricane Catastrophe Katrina Catastrophe , and various other factors .

the unk tests were a series of five nuclear bomb test Testing explosions Use_firearm conducted by india at the indian army 's pokhran test Research range in may 1998 .

It was the second instance of nuclear testing Testing conducted by India ; the first test Testing , code-named `` Smiling Buddha '' , was conducted Action in May 1974 .

the then chairman of the indian atomic energy commission described Statement each one of the explosions of `` unk '' to be `` equivalent to several tests carried out Action by other nuclear weapon states over decades '' .

Subsequently , India established Creating computer simulation capability to predict the yields of nuclear explosives whose designs are related to the designs of explosives used Using in this test Research .

On 13 May 1998 , two additional fission devices were detonated Attack , and the Indian government led by Prime Minister Atal Bihari Vajpayee shortly convened Come_together a press conference to declare Expressing_publicly India a full-fledged nuclear state .

Many names have been assigned Choosing to these tests ; originally these were collectively called Name_conferral `` Operation Shakti–98 '' , and the five nuclear bombs were designated Choosing `` Shakti-I '' through to `` Shakti-V '' .

With the success Achieve of Operation Hurricane , Britain became Becoming the third nuclear power after the United States and the Soviet Union .

during the second world war , britain commenced Process_start a nuclear weapons project , known as tube alloys , but the 1943 quebec agreement merged Cause_to_amalgamate it with the american manhattan project .

Several key British scientists worked Employment on the Manhattan Project , but after the war the Americans ended Process_end cooperation on nuclear weapons .

In January 1947 , a cabinet sub-committee decided Deciding , in response Response to an apprehension of American isolationism and fears of Britain losing Earnings_and_losses its great power status , to resume Process_start British efforts to build Building nuclear weapons .