Research Article

Uncertainty Analysis of Method-Based Operating Event Groups Ranking

Table 3

ID and description for selected event groups with presence in the respected country database.

IDDescriptionFRDE

01.2Loss of offsite power-loss of electrical bus barNY

02.3Reactivity events-transient pressure or temperature changesYN

03Loss of heat removal systemYY

04.1Leakages from the primary circuitYN
04.2Leakages from primary to secondary circuitNY
04.3Primary coolant leakage outside cont.YY

05.1Essential water intake clogging YN
05.2Failures in the component cooling or service water systems operating trainsYY

07.1Scram with influence on reactivityYY

08.2Other instrumentation and control failures affecting the reactor protection systemNY
08.3Instrumentation and control failures related to other safety systemsY

09.1Complete emergency diesel generator failure YY
09.3Incipient emergency diesel generator failure YN

10.2Control rod events without influence on reactivityNY

12Common cause failure events YN

13.2Failure of 1 safety system redundancy Y
13.3Failure of a safety system component Y
13.4Failure of safety features redundancies Y

14Actuation of safety features YY

15Lubricant YN

16.1Circuit misalignment (human/organization) YN
16.2Risk analysis (human/organization) YN
16.3Inadequate maintenance quality (human/organization) YN

17.1Failure after release from maintenance or design modificationY
17.2Failure caused by plant design modificationY
17.3Failure caused by using temporary devicesY
17.4Failure related to NPP modificationY

18.1Event external to the site YN

19.3Other reportable internal fires NY

21Design/construction YN

Y or N designates existence of the particular event group in the FR and DE country database.