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 
1997-05-16Degraded containment pressure suppression function during shutdown of reactor before outage periodSwedenFORSMARK-2
1991-09-10REVEAL OF INADVERTENTLY CLOSED MANUAL SERVICE VALVES AT VERIFICATION TESTS OF THE SCRAM SYSTEM BEFORE PREPARATIONS TO RESTARTSwedenFORSMARK-2
1995-07-15ONE CLOSED VALVE IN THE CONTAINMENT PRESSURE RELIEF LINE TO THE ATMOSPHERE AND TWO CLOSED VALVES IN THE VENTING LINE TO THE EMERGENCY FILTERSwedenFORSMARK-2
1996-07-18Erroneous line-up before start-up of vent pipe valves to the scrubber systemSwedenFORSMARK-1
2001-07-19Underdimensioned rupture disc installed in the FILTRA-systemSwedenBARSEBECK-2
1993-10-12IMPENETRABILITY TEST OF CONTAINMENT NOT APPROVEDSwedenBARSEBECK-2
1994-08-31LEAKING ISOLATION VALVES IN THE EMERGENCY CORE COOLING SYSTEMSwedenBARSEBECK-2
1991-09-08INADVERTENT STEAM RELEASE INTO THE REACTOR HALL DUE TO STOP OF PUMP IN RESIDUAL HEAT REMOVAL SYSTEMSwedenBARSEBECK-2
1996-06-12Degraded pressure subpression (PS) functionSwedenBARSEBECK-2
1994-08-26MISSING LUBRICATION GREASE TO THE ECC SYSTEM'S CORE SPRAY PUMPSSwedenBARSEBECK-1
1994-09-28PROTECTION SYSTEM FOR INITIATING BLOW DOWN NOT COMPLETELY REESTABLISHED AFTER REFUELLING OUTAGESwedenBARSEBECK-1
1995-07-10UNINTENTIONAL RELEASE TO THE SEA OF A MINOR AMOUNT OF SLIGHTLYCONTAMINATED WATERSwedenBARSEBECK-1
2014-05-02Inspection of Container No.TSAU 2600500 for Radioactive ContaminationSri Lankasri lanka colombo port
2013-12-13Contaminated Transport Package-Used Machineries and spare partsSri LankaColombo port-Consignee-M/S Tsukuba Lanka
1990-07-07REACTOR COOLANT LEAK ON REACTOR TEMPERATURE DETECTORSpainVANDELLOS-2
1997-03-26Worker contamination for AM-241 inhalation when manipulating a radiation detectorSpainVANDELLOS-1
1996-02-28Internal Contamination of Several Workers While Cleaning up EquipmentSpainVANDELLOS-1
1999-01-28Loss of reactor annulus integritySpainTRILLO-1
1994-01-18CRACK IN CONTROL ROD HOUSINGSpainJOSE CABRERA-1 (ZORITA)
1997-02-05Supposedly empty shipping containers found to contain nuclear materialSpainENUSA
1996-07-12Degradation of essential service water (ES'W) for a year due to a defficient design modificationSpainASCO-1
1997-01-17Slow insertion of control rodsSpainALMARAZ-2
2003-12-23Contamination of Demineralized Water System & Uncontrolled Minor Radioactivity ReleaseSouth KoreaYONGGWANG-5
2002-04-05Steam Generator Tube FailureSouth KoreaULCHIN-4
1999-09-10Loss of 185 MBq of I-131 in type A packagingSouth AfricaSOUTH AFRICAN AE CORP.
2002-11-28Improper performance of radiographySloveniaWelding Institute, Ljubljana
1993-11-26HUMAN ERROR INITIATED SAFETY INJECTION/REACTOR TRIPSloveniaKRSKO
1995-06-02TURBINE/REACTOR TRIP CAUSED BY AN ERROR IN THE EH CONTROL SYSTEM OF THE TURBINE GENERATORSloveniaKRSKO
2019-10-01Theft and recovery of a moisture/density gaugeSlovakiaBratislava-Podunajské Biskupice
2000-06-15Unplanned exposure of workersSlovakiaBOHUNICE-4