المقياس الدولي للأحداث النووية

المقياس الدولي للأحداث النووية والإشعاعية (International Nuclear and Radiological Event Scale واختصاره INES) قـُدِّم في 1990[1] من الوكالة الدولية للطاقة الذرية (IAEA) لتمكن ابلاغ سريع بالمعلومات السلامة الهامة في حالة حادث نووي.

والمقصود أن يكون المقياس لوغاريتمي، مشابه لمقياس ريختر الذي كان يستخدم لوصف القوة المقارنة للزلازال. كل مستوى في المقياس يمثل حوالي عشر أضعاف المستوى السابق له. مقارنة بالزلازل، حيث يمكن تقييم شدة الحدث كميا، مستوى شدة كارثة من صنع الإنسان، مثل الحادث النووي، is more subject to interpretation. بسبب صعوبة التفسير، فإن المقياس الدولي للأحداث النووية يتم تعيينه بعد حدوث الحدث مباشرة. ولذلك، فإن قدرة المقياس محدودة للغاية بالمساعدة في نشر الإغاثة من الكوارث.


Commonly, the organisation where the nuclear incident occurs assigns a first provisional INES rating to an incident, after it is being reviewed and possibly revised by the designated national radiation authority.

A number of criteria and indicators are defined to assure coherent reporting of nuclear events by different official authorities. يوجد 7 مستويات في المقياس الدولي للأحداث النووية؛ 3 مستوياتللأحداث و4 مستويات-حوادث. ويوجد أيضا المستوى 0.

7 – حادث عظيم
6 – حادث خطير
5 – حادث ذو عواقب أوسع
4 – حادث ذو عواقب محلية
3 – حدث خطير
2 – حدث
1 – Anomaly
0 – Deviation (لا أهمية له من حيث السلامة)

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التفاصيل

The level on the scale is determined by the highest of three scores: off-site effects, on-site effects, and defence in depth degradation.


المستوى 7: حادث عظيم

التأثير على البيئة والإنسان
Major release of radio­active ­material with widespread health and environmental effects r­equiring implementation of planned and extended ­countermeasures

الحادثة الوحيدة:

  • كارثة تشرنوبل، 26 أبريل 1986. سبب ارتفاع الطاقة أثناء اجراء إختبار، حادث عظيم، إلى إنفجار بخاري قوي وحريق إدى إلى إنبعاث a significant fraction of core material إلى البيئة، مما تسبب في وفاة 56 شخص كما قدر عدد المصابين بالسرطان بأكثر من مليون شخص ممن تعرضوا لجرعات مترفعة من الإشعاعات [2] وفقدان مساحات سكنية شاسعة. وكان هذا هو الحادث الوحيد الذي وقع من المستوى 7.

المستوى 6: حادث خطير

التأثير على البيئة والإنسان
Significant release of radioactive material likely to require implementation of planned countermeasures.

مثال

  • Kyshtym disaster في ماياك، الاتحاد السوڤيتي، 29 سبتمبر 1957. إنهيار نظام التبريد في منشأة معالجة نفايات نووية عسكرية أدى إلى ان at a military nuclear waste reprocessing facility caused a steam explosion that released 70–80 tons of highly radioactive material into the environment. Impact on local population is not fully known.[3]

المستوى 5: حادث ذو عواقب أوسع

Impact on People and Environment
Limited release of radioactive ­material likely to require i­mplementation of some planned­ countermeasures.
Several deaths from ­radiation.

مثال

  • Windscale fire (United Kingdom), 10 October 1957. Annealing of graphite moderator at a military air-cooled reactor caused the graphite and the metallic uranium fuel to catch fire, releasing radioactive pile material as dust into the environment.
Impact on Radiological Barriers and Control
Severe damage to reactor core.
Release of large quantities of radioactive material within an installation with a high probability of significant public exposure. This could arise from a major criticality accident or fire.

Example: Three Mile Island accident (Harrisburg, United States), 28 March 1979. A combination of design and operator errors caused a gradual loss of coolant, leading to a partial meltdown. Radioactive gases were released into the atmosphere.

أمثلة أخرى:

  • First Chalk River Accident Chalk River, Ontario, Canada, 12 December 1952. Reactor core damaged.
  • Goiânia accident (البرازيل), 13 September 1987. An unsecured caesium chloride radiation source left in an abandoned hospital was recovered by scavenger thieves unaware of its nature and sold at a scrapyard. 249 people were contaminated and 4 died.

المستوى 4: حادث ذو عواقب محلية

Impact on People and the Environment
Minor release of radioactive material unlikely to result in implementation of planned countermeasures other than local food controls.
At least one death from radiation.
Impact on Radiological Barriers and Control
Fuel melt or damage to fuel ­resulting in more than 0.1% release of core inventory.
Release of significant quantities of radioactive material within an installation with a high ­probability of significant public exposure.

الأمثلة:

المستوى 3: حدث خطير

Impact on People and Environment
Exposure in excess of ten times the statutory annual limit for workers.
Non-lethal deterministic health effect (e.g., burns) from radiation.
Impact on Radiological Barriers and Control
Exposure rates of more than 1 Sv/h in an operating area.
Severe contamination in an area not expected by design, with a low probability of ­significant public exposure.
Impact on Defence-in-Depth
Near accident at a nuclear power plant with no safety provisions remaining.
Lost or stolen highly radioactive sealed source.
Misdelivered highly radioactive sealed source without adequate procedures in place to handle it.

الأمثلة:

المستوى 2: حدث

Impact on People and Environment
Exposure of a member of the public in excess of 10 mSv.
Exposure of a worker in excess of the statutory annual limits.
Impact on Radiological Barriers and Control
Radiation levels in an operating area of more than 50 mSv/h.
Significant contamination within the facility into an area not expected by design.
Impact on Defence-in-Depth
Significant failures in safety ­provisions but with no actual ­consequences.
Found highly radioactive sealed orphan source, device or transport package with safety provisions intact.
Inadequate packaging of a highly radioactive sealed source.

الأمثلة:

المستوى 1: Anomaly

Impact on Defence-in-Depth
Overexposure of a member of the public in excess of statutory ­annual limits.
Minor problems with safety components with significant defence-in-depth remaining.
Low activity lost or stolen radioactive source, device or transport package.

(Arrangements for reporting minor events to the public differ from country to country. It is difficult to ensure precise consistency in rating events between INES Level-1 and Below scale/Level-0)

أمثلة:

  • Gravelines (Nord, France), 8 August 2009; during the annual fuel bundle exchange in reactor #1, a fuel bundle snagged on to the internal structure. Operations were stopped, the reactor building was evacuated and isolated in accordance with operating procedures. [6]
  • TNPC (Drôme, France), July 2008; leak of 6000 litres of water containing 75 kg of Uranium into the environment.

المستوى 0: Deviation

لا أهمية له من حيث السلامة.

أمثلة:

خارج المقياس

There are also events of no safety relevance, characterized as "out of scale".

أمثلة:

انظر أيضا


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الهامش

  1. ^ "Event scale revised for further clarity". World-nuclear-news.org. 2008-10-06. Retrieved 2010-09-13.
  2. ^ "IAEA Report". In Focus: Chernobyl. Archived from the original on 2007-12-17. Retrieved 2006-03-29.
  3. ^ http://www.iaea.org/Publications/Factsheets/English/ines.pdf
  4. ^ G A M Webb; et al. (2006). "Classification of events with an off-site radiological impact at the Sellafield site between 1950 and 2000, using the International Nuclear Event Scale". Journal of Radiological Protection. 26 (1): 33. doi:10.1088/0952-4746/26/1/002. PMID 16522943. {{cite journal}}: Explicit use of et al. in: |author= (help); Unknown parameter |month= ignored (help)
  5. ^ "Explosion at nuclear plant, thousands missing after Japan earthquake, tsunami" (Website). stuff. 13/03/2011. Retrieved 12/03/2011. {{cite web}}: Check date values in: |accessdate= and |date= (help); Cite has empty unknown parameter: |coauthors= (help)
  6. ^ (AFP) – 10 août 2009. "AFP: Incident "significatif" à la centrale nucléaire de Gravelines, dans le Nord". Google.com. Retrieved 2010-09-13.{{cite web}}: CS1 maint: numeric names: authors list (link)
  7. ^ News | Slovenian Nuclear Safety Administration
  8. ^ http://200.0.198.11/comunicados/18_12_2006.pdf
  9. ^ http://www.jaea.go.jp/02/press2005/p06021301/index.html (Japanese)
  10. ^ http://www.aerb.gov.in/t/annrpt/2002/chapter8.pdf
  11. ^ أ ب NRC: SECY-01-0071 – Expanded NRC Participation in the Use of the International Nuclear Event Scale

وصلات خارجية