Systems Exam 2 - RCDT

Question 1

RCDT Pump Trips

Answer 1

→Low level: 20%, manual restart
→Low flow: <50 gpm, manual restart
→must be manually restarted following blackout
→must be manually restarted after SI (buses are load shed, MCC must be energized again)

powered from:
→pump #1: uEB1-2
→pump #2: uEB2-2

Question 2

RCDT HX Design

Answer 2

→HX designed to maintain RCDT <170°F (10 gpm @ 600°F and 25 gpm from excess letdown)
→Normal: cool PRT from 200°F to 120°F in 8 hours using CCW
→Abnormal - cool PRT using Rx Makeup fill/drain in 1 hour

Question 3

LCV-1003 Design Reqs

Answer 3

→closes on phase A
→used to automatically maintain tank @ 39% by transfer to RHUT
→if both pumps running, RCDT HX must be bypassed and u-7135 must be opened to prevent exceeding design flow of HX (120 gpm) and LCV-1003 (80 gpm)
→discharges to RHT (Normal), SFP (Makeup Source) or WHT

Question 4

Tech Spec 3.6.3 Containment Isolation Valves (CIVs)

Answer 4

→each CIV shall be OPERABLE (Modes 1-4)
→7126 & 7150
→7135, 7136, 1003 (level control & bypass CIVs)
→also FC on Loss of Air

Question 5

What is notable about Manual Bypass valve u7135?

Answer 5

→goes around LCV-1003
→locked closed
→classified as a CIV

Question 6

What is the purpose of the RCDT?

Answer 6

The RCDT is used to recirculate, drain, or aid in purification of the contents of the PRT, RCS Loops, SI accumulators, and Refueling Cavity.

Question 7

The PRT can be aligned to be cooled by…

Answer 7

the RCDT using the Hx.

Question 8

Where can RCDT flow go?

Answer 8

→RHUT
→SFP
→WHT
→PRT

Question 9

Where can RCDT flow come from?

Answer 9

→vessel head O-ring leakoff
→Excess Letdown
→#2 RCP seal
→RCS Loops (need spoolpiece)
→SI Accumulators (need spoolpiece)
→PRT (for cooling)
→Refueling Canal