1.1-2
•
ל
SBCP Part) - Annex 1.1
Major Acode()
Setous Acer deat)
VASSdeat with off-
Site (aka)
(Aendent mainly in
nstallation)
Lovidents
3
(Serious Incident)
CONFIDENTIAL
Table 2 - Application of the International Nuclear Event Scale
Critena
Externaj release of a large traction of the reactor core inventory typically involving a mixture of short and long-lived radioactive fission products (in quenuues radiologically equivalent to more than tens of thousands of tera becquerels of iodine-131).
Possibility of acule nexith effects. Delaved health effects over a wide ares, posucuy Lavolving more than one country. Long term evaraamental. Consequences.
External release of fission products (in quanuues radiologically equivalent to the order of thousands to tens of thousands of terabecquerels of iodine- 131). Full impienentation of local energency plans most likely nezded to Virtut serious health effects.
Exteroni release of fisnon products (in quenques radiologiculy equivalent to une order of hundreds to thousands of lerabecquerdis of iodine-131). Parnal umplementation of energency plans (e.g.`local sheiterng and/or evacuauion) required in some cases to lesɔm the likelihood of heath effects.
Severe damage to large fracucu of the core due to mechanical effects and/or melting. -
External release of radioactivity resulting in a dose to the most exposed individual oil-site of the order of a few millisieverts. * Nerd for off-site protecnon actions generally unlikely except posmbly for local food control.
Some damage to reactor core due to mechanical effects and/or melting.
Worker doses that can lead to acute health effects (of the order of 1 siever).
External relcase of radioactivity above authorized limits, resulting in a dose to the most exposed individual off site of the order of teaths of a millisievert " Off-site protective measures not neezieri.
High radiation levels and/or contamination on-site due to equipment failures or operational incidents. Over-exposure of workers (individual doses exceeding 30 millisieverts).**
Examples
Chamoovi, USSR 1986
Windscale, UK 1957
Three Mile isiend.
USA, 1979
Saint Laurent France, 1980
Incidents in which a further failure of safety systems could lead to accident conditions, or a situation in which safety systems would be unable w prevent an accident if certain initiators were to occur.
Vandellos. Spain
1989
ļ
2
(acident)
1
(Anomaly)
Below stelażero
Technical incidents or anomalies which, although not directly oT immediately affecting plant safety, are liable to lead to subsequent re- evaluation of safety provisions.
Funcional or operational anomalies which do not pose a risk but whuch indicate a lack of safety provisions. This may be due to equipment failure, human error or procedural inadequacies. (Such anomalies should be distinguished from situations where operational limits and conditions are not exceeded and which are properly managed in accordance with adequate procedures. These are typically below scale').
No safety significance
The dexes are expressed in terms of effective dose equivalent (whole body dose). Those criteria, where appropriate, also em be expressed in terms of corresponding annual effluent discharge limits authorized by Nabonal euthentics.
Those dusts also are expressed, for simplicity, in terms of effective dose equivalents (Sieverts), although the dules in the range involving acute health effects should be expressed in terms of absorbed dose (Grays).
AX-01-01.DOC (Mar-93)
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