TOKYO - Sumber berita mengatakan Jepun telah memutuskan untuk meningkatkan tahap bahaya krisis nuklear akibat gempa dan tsunami kepada 7 - iaitu tahap tertinggi dan sama dengan bencana 1986 di Chernobyl di Kesatuan Soviet.
Mengutip sumber-sumber di Jepun Nuklear dan Badan Keselamatan Industri, agensi berita Kyodo dan NHK melaporkan bahawa NISA akan meningkatkan tahap serius bencana radiasi nuklear di kilang Fukushima Dai-ichi meningkat ke tahap 7 daripada 5, sebelum ini.
apakah maksud LEVEL 7?
Impact on people and environment
- Major release of radioactive material with widespread health and environmental effects requiring implementation of planned and extended countermeasuresThere have been only two such events to date:
Chernobyl disaster, 26 April 1986. A power surge during a test procedure resulted in a criticality accident, leading to a powerful steam explosion and fire that released a significant fraction of core material into the environment, resulting in a death toll of 56 as well as estimated 4,000 additional cancer fatalities among people exposed to elevated doses of radiation. As a result, the city of Chernobyl (pop. 14,000) was largely abandoned, the larger city of Pripyat (pop. 49,400) was completely abandoned, and a 30 km exclusion zone was established.
Fukushima I nuclear accidents, a series of events beginning on 11 March 2011. Rated level 7 on 11 April 2011 (genap sebulan) by the Japanese government's nuclear safety agency. Major damage to the backup power and containment systems caused by the 2011 Tōhoku earthquake and tsunami resulted in overheating and leaking from some of the Fukushima I nuclear plant's reactors (Note: Each reactor accident was rated separately as level 5; the situation as a whole was rated level 7). An exclusion zone of 20km was established around the plant.
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