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 
2000-04-15Moderator water leak in moderator roomIndiaNARORA-2
1991-05-03FAILURE OF FUEL OIL LINE IN RUNNING DG-2IndiaKALPAKKAM-2
1992-03-30DROPPING OF A SPENT FUEL BUNDLE IN INSPECTION BAYIndiaKALPAKKAM-2
1992-09-16TRITIUM RELEASE DUE TO SPILLAGE OF HEAVY WATER FROM MODERATOR SYSTEMIndiaKALPAKKAM-2
1990-10-23MG-TRIPPING ON UNDER/OVER FREQUENCY PROTECTIONIndiaKALPAKKAM-1
1991-01-07SHUT DOWN OF MAPS UNITS 1 AND 2 FOLLOWING INABILITY TO MEET MINIMUM STAFF REQUIREMENTIndiaKALPAKKAM-1
1991-03-07HEAVY WATER SPILL FROM MODERATOR SYSTEMIndiaKALPAKKAM-1
1991-11-04LOSS OF CLASS III SUPPLY DUE TO FAULT IN CLASS III BUS SUPPLY BREAKERIndiaKALPAKKAM-1
1994-08-12INADVERTENT LOADING OF FUEL COLUMN DURING ON-POWER REFUELLING OF COOLANT CHANNELIndiaKALPAKKAM-1
1991-12-13CONTAMINATION OF SUBSOIL AT DHRUVA - CIRUS COMPLEXIndiaDHRUVA
2006-11-16Theft of Nucleonic Density Gauge Device containing Cs-137 sourceIndiaCoal washery
1994-04-12IRRADIATED FUEL ROD REMAINING IN THE FLASK WITHOUT COOLING - HUMAN ERRORIndiaCIRUS
2019-06-26Loss and subsequent recovery of a radiography device containing sourceIndiaChakan, Pune
2019-01-21Drop of a source into a logging wellHungaryPécs
1988-06-30DEGRADATION OF NATURAL CIRCULATIONHungaryPAKS-4
1994-01-03RENDERING AN EMERGENCY FEEDWATER PUMP AND AN AUXILIARY EMERGENCY FEEDWATER PUMP AVAILABLE FOR A SHORT TIME WITHOUT ADHERANCE TO THE REQUIREMENTS OF THE TECSPECSHungaryPAKS-4
1994-07-14SIMULTANEOUS INOPERABILITY OF TWO HIGH-PRESSURE ECCS PUMPSHungaryPAKS-4
1993-05-03UNCONTROLLED INCREASE OF REACTOR POWERHungaryPAKS-4
2006-06-22Temperature increase of control rod drive housing 6/7 during restart of Unit 4HungaryPAKS-4
1992-12-23LEVEL DECREASE IN ECCS TANK 20TJ20B001,2HungaryPAKS-2
1993-09-15DETERIORATION OF NATURAL CIRCULATIONHungaryPAKS-2
1991-07-18REACTOR SCRAM AND COOLDOWN BECAUSE OF LEAKAGE IN A PRIMARY CIRCUIT MEASURING SYSTEMHungaryPAKS-1
2012-09-05Inadequate planned repair of the 10UV68S201 quick-acting gate valve despite of the regulations of the Operational Limits and ConditionsHungaryPAKS-1
2008-07-07Deterioration of the containment depression of unit 1 during an air locking operation for maintenance activitiesHungaryPAKS-1
2022-05-29Violation of Operational Limits and Conditions is the Interim Spent Fuel Storage FacilityHungaryPaks, Interim Spent Fuel Storage Facility
2021-02-11Violation of OL&C in the Interim Spent Fuel Storage Facility at PaksHungaryPaks
2022-04-21Rod type source of a level gauge became openHungaryNitronénművek Co Ltd.
2021-05-23Failure of a defectoscope during industrial radiography testHungaryBorsodchem PLC
2000-12-28Radioactive source found in scrap recycling facility in GreeceGreeceHELLENIC STEEL PRODUCTION CO.
2002-01-18Radioactice source found in a scrap recycling facility in GreeceGreeceHalivourgiki / Aspropirgos