INES Levels
INES N/A
INES 0
INES 1
INES 2
INES 3
INES 4
INES 5
INES 6
INES 7

INES 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. Also, it is difficult to ensure precise consistency in rating events between INES Level-1 and Below scale/Level-0)
Legenda & explanation
date title location 
2000-01-31Loss of power of a 220 VAC safety bus barArgentinaEMBALSE
2003-07-01Radiological incident occurred in the fuel element auxiliary pool, involving Co-60 withdrawn from an adjuster unitArgentinaEMBALSE
2006-12-07Incidental Exposure during maintenance tasksArgentinanon nuclear
2015-03-14Found category 4 source, shutter of the source container partly openAustriaAustrian-Italian border station
2008-08-03Incident involving radioactive material at IAEA safeguards laboratoryAustriaIAEA Safeguards Seibersdorf Laboratory
2001-10-09Iridium source lost in a stolen vanBelgiumBINCH
2011-09-13Melting of Orphan SourceBelgiumDuferco - la Louvière
1991-03-19LEAKAGE IN THE GASEOUS WASTE PROCESSING SYSTEM (GWPS)BrazilANGRA-1
1993-03-05COOLANT RADIOACTIVITY EXCEEDING OPERATING LIMITS DUE TO FUEL ROD FAILUREBrazilANGRA-1
1991-07-15FIRE IN LOW LEVEL RADIOACTIVE WASTE STORAGEBulgariaKOZLODUY-1
1991-07-18EARTHQUAKE IN CENTRAL EUROPEBulgariaKOZLODUY-1
1991-07-22CONTAMINATION OF SOIL ON SITEBulgariaKOZLODUY-1
1991-08-06NEW RADIOACTIVE "HOT SPOTS" DISCOVERED AT KOZLODUY NPPBulgariaKOZLODUY-1
1992-06-10CONTAMINATED PARTICLES DISCOVERED ON-SITEBulgariaKOZLODUY-1
1994-05-15DETERIORATION OF NATURAL CIRCULATION DURING REPAIR WORKS AT UNIT NO. 1BulgariaKOZLODUY-1
1994-11-24LOSS OF ELECTRICAL SUPPLY OF THE BANK PUMP STATION OF KOZLODUY NPPBulgariaKOZLODUY-1
1994-11-24LOSS OF OFF-SITE AC POWERBulgariaKOZLODUY-1
1990-12-21REACTOR COOLANT LEAKAGE DUE TO FAILURE OF SEALING OF MAIN REACTOR FLANGEBulgariaKOZLODUY-2
1991-02-05PRESSURIZER DISCHARGE TANK MEMBRANE RUPTUREBulgariaKOZLODUY-2
1993-01-02SMALL STEAM LEAK FROM THE MAIN FLANGE OF THE PRIMARY COOLANT PUMP NO. 4BulgariaKOZLODUY-2
2003-01-20Reactor Protection Actuation and safety injectionBulgariaKOZLODUY-3
1996-05-15Small leak of radioactive water from auxiliary building no. 2BulgariaKOZLODUY-3
2000-08-27Increase in the gamma background in front of the reactor building of unit 3BulgariaKOZLODUY-3
1991-09-14SMALL STEAM LEAK FROM THE MAIN FALNGE OF THE PRIMARY COOLANT PUMP NO. 6BulgariaKOZLODUY-4
1991-05-11UNPLANNED EXPOSURE OF PERSONNEL DURING REFUELLINGBulgariaKOZLODUY-5
1992-09-22SMALL FIRES CAUSED BY SHORT-CIRCUITBulgariaKOZLODUY-5
1996-05-16Disturbance of forced reactor coolant circulation in cold shutdown conditionBulgariaKOZLODUY-5
2012-09-03Stolen and lately recovered intact radioactive sourceBulgariaSofia
1993-03-05UNITS DERATED TO 60% REACTOR POWER DUE TO SAFETY ANALYSIS CONCERNSCanadaBRUCE-1
1995-05-14SPURIOUS OPENING OF REACTOR COOLANT LIQUID RELIEF VALVECanadaBRUCE-5