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 
1988-06-30DEGRADATION OF NATURAL CIRCULATIONHungaryPAKS-4
1990-01-01FUEL BUNDLE LATTICE SPACING FAILURESFinlandLOVIISA-1
1990-05-28FEEDWATER TUBE RUPTURE DUE TO EROSION CORROSIONFinlandLOVIISA-1
1990-07-07REACTOR COOLANT LEAK ON REACTOR TEMPERATURE DETECTORSpainVANDELLOS-2
1990-07-22LOSS OF POWER SUPPY TO REACTOR COOLANT PUMPS DUE TO 6 KV CABLE FIRERussian FederationSMOLENSK-2
1990-09-04REACTOR START UP WITH DEGRADED REACTOR SHUT DOWN SYSTEMSSwitzerlandLEIBSTADT
1990-10-01FAULTY WELD DETECTED ON PRIMARY CIRCUITSwedenOSKARSHAMN-1
1990-10-16DROPPING OF SPENT FUEL BUNDLES OF CHANNEL P-09 IN SOUTH SIDEFUEL TRANSFER CAVITYIndiaRAJASTHAN-1
1990-10-23MG-TRIPPING ON UNDER/OVER FREQUENCY PROTECTIONIndiaKALPAKKAM-1
1990-12-06TURBINE SJAES STEAMING DUE TO PLANT PERSONNEL ERRORRussian FederationSMOLENSK-3
1990-12-21REACTOR COOLANT LEAKAGE DUE TO FAILURE OF SEALING OF MAIN REACTOR FLANGEBulgariaKOZLODUY-2
1991-01-07SHUT DOWN OF MAPS UNITS 1 AND 2 FOLLOWING INABILITY TO MEET MINIMUM STAFF REQUIREMENTIndiaKALPAKKAM-1
1991-01-11UNIT SHUTDOWN DUE TO SG-4 PULSE LINE RUPTURERussian FederationNOVOVORONEZH-5
1991-02-05PRESSURIZER DISCHARGE TANK MEMBRANE RUPTUREBulgariaKOZLODUY-2
1991-03-07HEAVY WATER SPILL FROM MODERATOR SYSTEMIndiaKALPAKKAM-1
1991-03-19LEAKAGE IN THE GASEOUS WASTE PROCESSING SYSTEM (GWPS)BrazilANGRA-1
1991-03-31WRONG POSITIONING OF THE FUEL ASSEMBLY WHILE PERFORMING FUEL ROD CLADDING INTEGRITY TESTRussian FederationKOLA-2
1991-04-07MISGRAPPLING OF FUEL BUNDLE MB-140 IN THE CORE OF UNIT NO. 2IndiaTARAPUR-2
1991-05-03FAILURE OF FUEL OIL LINE IN RUNNING DG-2IndiaKALPAKKAM-2
1991-05-11UNPLANNED EXPOSURE OF PERSONNEL DURING REFUELLINGBulgariaKOZLODUY-5
1991-05-28FUEL ASSEMBLY TILTED OVER DURING CORE LOADINGSwedenRINGHALS-2
1991-06-01UNIT SHUTDOWN DUE TO PERSONNEL ERRORS AND DAMAGE TO RCP 6 KV BREAKERRussian FederationKALININ-2
1991-07-09HIGH ACTIVITY IN TB PITIndiaRAJASTHAN-2
1991-07-15FIRE IN LOW LEVEL RADIOACTIVE WASTE STORAGEBulgariaKOZLODUY-1
1991-07-18EARTHQUAKE IN CENTRAL EUROPEBulgariaKOZLODUY-1
1991-07-18REACTOR SCRAM AND COOLDOWN BECAUSE OF LEAKAGE IN A PRIMARY CIRCUIT MEASURING SYSTEMHungaryPAKS-1
1991-07-22CONTAMINATION OF SOIL ON SITEBulgariaKOZLODUY-1
1991-08-06NEW RADIOACTIVE "HOT SPOTS" DISCOVERED AT KOZLODUY NPPBulgariaKOZLODUY-1
1991-08-14DEVIATION FROM OPERATING INSTRUCTIONSSwedenOSKARSHAMN-2
1991-09-08INADVERTENT STEAM RELEASE INTO THE REACTOR HALL DUE TO STOP OF PUMP IN RESIDUAL HEAT REMOVAL SYSTEMSwedenBARSEBECK-2