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 
1991-09-10REVEAL OF INADVERTENTLY CLOSED MANUAL SERVICE VALVES AT VERIFICATION TESTS OF THE SCRAM SYSTEM BEFORE PREPARATIONS TO RESTARTSwedenFORSMARK-2
1991-09-14SMALL STEAM LEAK FROM THE MAIN FALNGE OF THE PRIMARY COOLANT PUMP NO. 6BulgariaKOZLODUY-4
1991-09-18ONE FUEL ASSEMBLY TILTED DURING REFUELLINGSwedenRINGHALS-4
1991-09-19FUEL BUNDLE DAMAGE DURING TRANSFER TO SPENT FUEL BAYCanadaGENTILLY-2
1991-09-20INCREASE ACTIVITY OF WASTE WATER FROM THE A-1 AND V-1 NPPSSlovakiaBOHUNICE-1
1991-11-04LOSS OF CLASS III SUPPLY DUE TO FAULT IN CLASS III BUS SUPPLY BREAKERIndiaKALPAKKAM-1
1991-12-06DEVIATION FROM THE NORMAL ON-LOAD REFUELING REGIME DUE TO FUEL ASSEMBLY SEPARATION FROM THE CONNECTING BARRussian FederationSMOLENSK-3
1991-12-13CONTAMINATION OF SUBSOIL AT DHRUVA - CIRUS COMPLEXIndiaDHRUVA
1992-01-18AN IMPORTANT LOSS OF COMMUNICATIONS IN MAIN CONTROL ROOMMexicoLAGUNA VERDE-1
1992-01-24HEAVY WATER LEAK FROM RUPTURED HOSEIndiaRAJASTHAN-2
1992-03-30DROPPING OF A SPENT FUEL BUNDLE IN INSPECTION BAYIndiaKALPAKKAM-2
1992-04-16DEGRADED WATER CHEMISTRY IN THE PRIMARY CIRCUIT DUE TO CEMENT MORTAR INGRESS INTO THE BORATED WATER STORAGE TANKRussian FederationKOLA-2
1992-05-09REACTOR SHUTDOWN BY TECHNICAL SPECIFICATIONS APPLICATION (UNUSUAL EVENT)MexicoLAGUNA VERDE-1
1992-05-13RECIRCULATION TRANSIENT WITH A SUDDEN INCREASE IN POWER OVER 100%MexicoLAGUNA VERDE-1
1992-05-13UNIT-2 EMERGENCY CONDENSER LOOP A TUBE FAILUREIndiaTARAPUR-2
1992-05-15DEUTERIUM EXCURSION IN MODERATOR COVER GASIndiaRAJASTHAN-2
1992-05-28A NON USUAL EVENT DUE TO THE LIBERATION OF GASES INSIDE THE PLANTMexicoLAGUNA VERDE-1
1992-06-04INOPERABILITY OF HERMETIC COMPARTMENT PRESSURE INDICATORS OF ESFASCzech RepublicDUKOVANY-2
1992-06-10CONTAMINATED PARTICLES DISCOVERED ON-SITEBulgariaKOZLODUY-1
1992-06-28TRITIUM ACTIVITY IN PROCESS WATER RETURNIndiaRAJASTHAN-2
1992-07-04INSPECTION HEAD LEFT IN CHANNEL G-09 IN UNIT-2IndiaRAJASTHAN-2
1992-07-06FAILURE OF TWO DIESEL GENERATORS WHILE ROUTINE TESTING DURING UNIT MAINTENANCERussian FederationBALAKOVO-2
1992-08-18LOW ACTIVITY BORATED WATER LEAK FROM MAKE-UP SYSTEMCzech RepublicDUKOVANY-1
1992-08-19STARTUP AUXILIARY TRANSFORMER X03B OUTAGE EXCEEDING SEVEN DAYS LIMITIndiaTARAPUR-2
1992-08-21SOIL CONTAMINATION WHILE PUMPING OUT RAIN WATER FROM TAPS-TRAP TRANSFER LINE INSPECTION PITIndiaTARAPUR-1
1992-09-03LOSS OF 250V DC CONTROL POWER SUPPLY TO 415 V BKRS CONNECTED WITH CLASS-III BUS L&LXIndiaRAJASTHAN-2
1992-09-16TRITIUM RELEASE DUE TO SPILLAGE OF HEAVY WATER FROM MODERATOR SYSTEMIndiaKALPAKKAM-2
1992-09-17TRITIUM ACTIVITY DISCHARGE TO LAKEIndiaRAJASTHAN-2
1992-09-18LOSS OF INTERNAL POWER DUE TO THE TRIP OF THE MAIN TRANSFORMER (T-1)MexicoLAGUNA VERDE-1
1992-09-22SMALL FIRES CAUSED BY SHORT-CIRCUITBulgariaKOZLODUY-5