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Extra info for Common-Cause Failures of Emergency Diesel Generators (csni-r2000-20)
Example text
7 Other Root Cause Two events were identified resulting from causes that did not fit the other categories of root causes. Both of these causes were identified as setpoint drift, with no underlying reason for the setpoint drift. Both events occurred in the I&C subsystem, one on the overspeed protection circuit and the other on the governor control unit. In both events, the multiple EDG failures were coupled by shared hardware design. One event was fail-to-start and the other was fail-to-run. 50 NEA/CSNI/R(2000)20 8.
Corrective actions distribution for cooling subsystem. 54 NEA/CSNI/R(2000)20 8 7 No. of Events 6 5 4 3 2 1 0 2 3 4 5 6 7 8 CCCG Size Fail to Run Fail to Start Figure 8-4. CCCG size distribution for cooling subsystem. 9 8 No. of Events 7 6 5 4 3 2 1 Te st Ma int en an ce Ins pe c ti on De ma nd 0 Detection Method Fail to Run Fail to Start Figure 8-5. Detection method distribution for cooling subsystem. 1 Engine Overview Reviewers assigned 16 events to the engine subsystem. The failure mode for 13 of those events is fail-to-run and fail-to-start for three events.
Figure 7-2 contains the distribution by corrective actions by failure mode. Figure 7-3 contains the distribution for CCCG size by failure mode. Figure 7-4 contains the distribution for detection method by failure mode. No environmental events were detected by either the “demand” or “maintenance” detection methods. Figure 7-5 contains the distribution for subsystem by failure mode. More environmental events affected the cooling system than any other subsystem; primarily due to the dependence of the cooling system on the ultimate heat sink temperature and debris level, two factors that are not in direct licensee control.