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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Ranco Seco Loss of ICS Power Chapter 15.0 B&W Cross-Training Cross Training Course R-326C 1

OBJECTIVES

1. Describe the symptoms of an overcooling transient.

2. Explain how the loss of power to the ICS 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.

2

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 Fig.

11

12 Main Steam System (Fig. 15-2)

MFW reg. valves assume 50% open positions.

MFW block valves close.

13 Main Feedwater System (Fig. 15-3)

14 Auxiliary Feedwater System (Fig. 15-4)

15 High Pressure Injection System (Fig. 15-5)

Dominant Core Vulnerability Sequence Event Tree Fig 15-6 Fig. 15 6 16

Dominant Core Damage Sequence Event Tree Fig. 15-7 17