ML11221A299

521- R326C B&W Tech Cross Training - Chapter 15 Rancho Seco Loss of ICS Power

ML11221A299
Person / Time
Site:	Rancho Seco
Issue date:	08/01/2011
From:	NRC/HR/ADHRTD/RTTB-PWR
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Download: ML11221A299 (17)

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RancoSecoLoss of ICS Power Chapter 15.0B&WCrossTrainingCourse 1 B&W Cross-Training Course R-326C OBJECTIVES1.Describe the symptoms of an overcooling transient.2.Explain how the loss of power to the ICS controlstationsresultedin:

2 control stations resulted in:a.An overheating event and b.A subsequent overcooling event.3.Describe the effect of operating a multi-stage centrifugal pump without a suction

source.

Appendix -Sequence of Events 3

Appendix -Sequence of Events 4

Appendix -Sequence of Events 5

Appendix -Sequence of Events 6

Appendix -Sequence of Events 7

Appendix -Sequence of Events 8

Appendix -Sequence of Events 9

Appendix -Sequence of Events 10 ICS Power Supplies Fig 15-1 11 Fig. 15-1 12Main Steam System (Fig. 15-2)

MFW reg. valves assume 50% open positions.MFW block valves close.

13Main Feedwater System (Fig. 15-3) 14Auxiliary Feedwater System (Fig. 15-4) 15High Pressure Injection System (Fig. 15-5)

Dominant Core Vulnerability Sequence Event Tree Fig 15 6 16 Fig. 15-6 Dominant Core Damage Sequence Event TreeFig. 15-7 17