P11 - CST/CRWST Transfer

Question 1

What valves auto close on high flow? and why?

Answer 1

P11-F514, 513, F011 (CRWST valves) to supply water to CTMT fire water system.

Question 2

What flow do the CRWST valves close at? (high flow due to CTMT fire water system)
and when will they reopen?

Answer 2

Close @ > 9.9” water column after 5 sec TD

re-open @ < 9.9” water column

Question 3

What’s the purpose of CST/CRWST transfer system?

Answer 3

Primary source of water of HPCS, RCIC, CRD, seal steam, and CTMT fire protection system. Also transfers water from upper CTMT pool during refueling operations and from cask storage.

Question 4

What is lost if instrument air is lost?

Answer 4

Fire water to CTMT (normal supply)

Question 5

In the event of a group 6 isolation, what will be lost?

Answer 5

Fire water to CTMT

Question 6

Where are the RWST pumps operated?

Answer 6

Locally

Question 7

What are the RWST pump trips?

Answer 7

Low suction pressure, MPD

Question 8

How do the valves fail on loss of air?

Answer 8

All close except for F505 (condensate transfer pump recirc valve fails open)

Question 9

What’s the only continuously supplied load from CRWST system?

Answer 9

Seal steam

Question 10

When will the standby condensate transfer pump start?

Answer 10

< 76 psig (must be manually secured)

Question 11

What’s the normal suction supply of the condensate transfer pumps?

Answer 11

CST