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Tōkai (東海村; -mura) is a village located in Naka District, Ibaraki, Japan. It is approximately 120 km north of Tokyo, Japan on the Pacific coast. A village (æ‘ mura or son) is a local administrative unit in Japan. ...
Naka (那珂郡; -gun) is a district of Ibaraki, Japan. ...
Ibaraki Prefecture (茨城県; Ibaraki-ken) is located in the Kanto region on Honshu island, Japan. ...
View of Tokyos Shibuya district Long a symbol of Tokyo, the Nijubashi Bridge at the Kokyo Imperial Palace. ...
The Pacific Ocean (from the Latin name Mare Pacificum, peaceful sea, bestowed upon it by the Portuguese explorer Ferdinand Magellan) is the worlds largest body of water. ...
As of 1 January 2005, the village has an estimated population of 35,467 and a density of 946.29 persons per km². The total area is 37.48 km². January 1 is the first day of the calendar year in both the Julian and Gregorian calendars. ...
2005 (MMV) was a common year starting on Saturday of the Gregorian calendar. ...
Population density is a measurement of population per unit area or unit volume. ...
Square kilometre (US spelling: Square kilometer), symbol km², is an SI unit of surface area. ...
Aside from nuclear facilities, Tokai has lovely beaches.
JCO reactivity accident Tokai is best known for a nuclear accident that occurred on September 30, 1999, which killed two people. The accident was a Criticality accident. Pathways from airborne radioactive contamination to man This is a list of notable accidents involving nuclear material. ...
September 30 is the 273rd day of the year (274th in leap years) in the Gregorian calendar, with 92 days remaining. ...
1999 (MCMXCIX) was a common year starting on Friday, and was designated the International Year of Older Persons by the United Nations. ...
A criticality accident (also sometimes referred to as an excursion or power excursion) occurs when a nuclear chain reaction is accidentally allowed to occur in fissile material, such as enriched uranium or plutonium, or compounds thereof This releases neutron radiation which may be highly dangerous to surrounding personnel and which...
The Tokaimura nuclear accident happened at the JCO reconversion plant. Nuclear reprocessing separates any usable elements (e. ...
The accident was caused when seven times the allowable limit of 18.8% enriched uranium dioxide was mixed with nitric acid in order to form uranyl nitrate, and was put in a precipitation tank to homogenize. At 10:35 am, when the seventh bucket (making a total of 16 kg of enriched uranium) was poured into the precipitation tank by two technicians, a blue flash of radiation occurred and the two technicians felt severe pain, nausea and had trouble breathing. The radiation alarms went off and the two technicians and their supervising technicians immediately left the building. UO2 A black, radioactive, crystalline powder, once used in the late 1800s to mid-1900s in ceramic glazes. ...
R-phrases , S-phrases , , , , Flash point not applicable RTECS number QU5775000 Supplementary data page Structure and properties n, εr, etc. ...
Uranyl nitrate (UO2(NO3)2) is a water soluble yellow uranium salt. ...
Enriched uranium is uranium whose uranium-235 content has been increased through the process of isotope separation. ...
The criticality was stopped 20 hours later by draining the cooling water jacket around the precipitation tank and filling it with argon, and purging the tank with boric acid. General Name, Symbol, Number argon, Ar, 18 Chemical series noble gases Group, Period, Block 18, 3, p Appearance colorless Atomic mass 39. ...
Boric acid, also called boracic acid or orthoboric acid, is a mild acid often used as an antiseptic, insecticide, flame retardant, and as a precursor of other chemical compounds. ...
Due to the radiation they received, the two technicians died on December 22, 1999, and April 27, 2000, respectively. December 22 is the 356th day of the year (357th in leap years) in the Gregorian Calendar. ...
1999 (MCMXCIX) was a common year starting on Friday, and was designated the International Year of Older Persons by the United Nations. ...
April 27 is the 117th day of the year (118th in leap years) in the Gregorian Calendar, with 248 days remaining. ...
This article is about the year 2000. ...
External links - Tokai official website in Japanese
- [1] Report by the IAEA on the event.
- [2] A report on Soviet criticality events.
- [3] A review of criticality accidents, Warning it is a big file.
IAEA The International Atomic Energy Agency (IAEA), established as an autonomous organization on July 29, 1957, seeks to promote the peaceful use of nuclear energy and to inhibit its use for military purposes. ...
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