Inadvertent ESAS

Question 1

What are the effects of ES Channel 1 or 2 and actions taken?

Answer 1

Effects: Valves will isolate (BWST recirc, QT sample, RB Sump to AB Sump, RBVH Isol, RCP SBO valves, 3820, SW Crossties, 1214/1216, 1233, 1301. HPI will initiate and HPI blocks open. Lose associated A-1/A-2 bus due to Unit aux feed opening. EDGs will both start.

Actions: Trip RX, secure HPI pump, restore SW/ACW, restore seal injection, restore letdown and normal RCP SBO alignment.

Question 2

What are the effects of ES Channel 3 or 4 and actions taken?

Answer 2

Effects: Valves isolate (1441, N2 to RB, FW to RB, QT outlet, Purge valves, RB Leak detector. LPI actuates, and EFIC A/B actuates.

Actions: Secure EFW, Secure LPI pump and close BWST outlet, restore systems.

Question 3

What are the effects of ES Channel 5 or 6 and actions taken?

Answer 3

Effects: Isolate ICW to RB, chill water to RBCC. Pent vent starts, and RB cooling starts.

Actions: Trip RX, Trip RCPs, Perform RT-5, Place ICW valves in man and open, blah blah blah, secure pent vent.

Question 4

What are the effects of ES Channel 7 or 8 and actions taken?

Answer 4

Effects: RB spray actuation

Actions: Secure RB spray pump and close RB spray block valve.

Question 5

Which Inadvertent ES channels require Rx trip?

Answer 5

1,2,5,6

1 & 2 because loss of A bus

5 & 6 because RCP loss of ICW

Question 6

What are the purposes of attachment 11 and 12?

Answer 6

Attachment 11: Restore SW/ACW

Att 12: Restore MU & SI