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 
1996-07-18Erroneous line-up before start-up of vent pipe valves to the scrubber systemSwedenFORSMARK-1
2013-05-30EDG failed to start after unintentional loss of two phases on 400 kV incoming offsite supplySwedenFORSMARK-3
1996-04-19ECI impairment due to check valve failure resulting in forced outage of Pickering stationCanadaPICKERING-1
1991-07-18EARTHQUAKE IN CENTRAL EUROPEBulgariaKOZLODUY-1
1990-10-16DROPPING OF SPENT FUEL BUNDLES OF CHANNEL P-09 IN SOUTH SIDEFUEL TRANSFER CAVITYIndiaRAJASTHAN-1
1992-03-30DROPPING OF A SPENT FUEL BUNDLE IN INSPECTION BAYIndiaKALPAKKAM-2
1995-02-14DROP TIME OF CONTROL RODS OUT OF CRITERIONChinaGUANGDONG-1
2019-01-21Drop of a source into a logging wellHungaryPécs
1996-05-16Disturbance of forced reactor coolant circulation in cold shutdown conditionBulgariaKOZLODUY-5
2001-04-04Discovery of an Interlock Defeat applied to the Fuelling Machine d/P/dT Protection system without applicationUnited KingdomDUNGENESS-B1 UNIT A
2019-12-12Discovered Ra-226 source in transport container containing scrap metal.NorwayHermod Teigen AS, Egersund, Norway
2020-11-24Discovered Ra-226 source in Copper scrap metalsIranIslamic Republic of, Northwest border
1993-06-03DIESEL GENERATOR START FAILURESlovakiaBOHUNICE-3
1991-12-06DEVIATION FROM THE NORMAL ON-LOAD REFUELING REGIME DUE TO FUEL ASSEMBLY SEPARATION FROM THE CONNECTING BARRussian FederationSMOLENSK-3
1995-11-15DEVIATION FROM TECHNICAL SPECIFICATIONSSwedenRINGHALS-4
1991-08-14DEVIATION FROM OPERATING INSTRUCTIONSSwedenOSKARSHAMN-2
1992-05-15DEUTERIUM EXCURSION IN MODERATOR COVER GASIndiaRAJASTHAN-2
1994-02-24DETERIORATION OF THE PRIMARY CIRCUIT INTEGRITYLithuaniaIGNALINA-2
2008-07-07Deterioration of the containment depression of unit 1 during an air locking operation for maintenance activitiesHungaryPAKS-1
1994-05-15DETERIORATION OF NATURAL CIRCULATION DURING REPAIR WORKS AT UNIT NO. 1BulgariaKOZLODUY-1
1993-09-15DETERIORATION OF NATURAL CIRCULATIONHungaryPAKS-2
2009-07-24Detachment, spreading and recovery of industrial radiography sourcePeruLima
2001-12-14DESTRUCTION OF A PIPING INSIDE CONTAINMENTGermanyBRUNSBUETTEL
1995-08-26DESIGN DEFICIENCIES IN DIESEL GENERATORS FOUND DURING EXTENDED TESTINGSwedenOSKARSHAMN-1
1995-01-01DESIGN DEFICIENCIES IDENTIFIED IN SEPARATION OF ELECTRICAL SYSTEM, AVOIDANCE OF COMMON CAUSE FAILURES IN THE REACTOR PROTECTION SYSTEM AND OVERPRESSURE RELEASE IN THE AUX BUILD.SwedenOSKARSHAMN-1
1992-04-16DEGRADED WATER CHEMISTRY IN THE PRIMARY CIRCUIT DUE TO CEMENT MORTAR INGRESS INTO THE BORATED WATER STORAGE TANKRussian FederationKOLA-2
1996-06-12Degraded pressure subpression (PS) functionSwedenBARSEBECK-2
1997-05-16Degraded containment pressure suppression function during shutdown of reactor before outage periodSwedenFORSMARK-2
1988-06-30DEGRADATION OF NATURAL CIRCULATIONHungaryPAKS-4
1996-07-12Degradation of essential service water (ES'W) for a year due to a defficient design modificationSpainASCO-1