MUP Flashcards
Purpose of makeup and purification system
- Supply RCS with fill and operational M/U water
- Provide seal injection and seal return for RCPs
- Provide purification of RCS
- Control Boric Acid and Chemical Control
- Deal with changes in RCS volume
- Supply borated water to CFT
- PZR aux spray source
- Borated water injection for ES
Design Basis
- Control RCS inventory and boric acid via letdown/makeup
- Purify letdown (max flow 160gpm, min 45 gpm=1 vol/day)
- Accommodate for thermal expansion
- ES
- ECCS
- long term cooing after loca
- emergency boration
Which valves of letdown coolers get an ES signal?
the outlet valves
Is leakage from a letdown cooler pressure boundary leakage?
Yes, until that cooler is isolated.
Letdown coolers - tube side is ___, shell side is _____
RCS
Nuke ICW
Explain letdown isolation valve timing
When opening, the ICW inlet opens for 20 sec, then the LD valve opens
When closing, the LD valve closes for 8 sec, then the ICW valve closes
What is the expansion tank for after the letdown coolers?
N-16 decay, minimizes dose in people space
What is CV-1221?
- Closes on ES 2
- UNPPR
- only single valve that can normally isolate letdown,
- ALSO closes if letdown @ 135F to protect resin
When is MU-4 used and why?
used in a shutdown condition to ensure adequate flow in letdown line.
When is MU-4 used and why?
used in a shutdown condition to ensure adequate flow in letdown line.
Explain Gross/iodine ratio
Gross goes up = ratio gets bigger = crud burst
iodine goes up = ratio goes down = fuel failure
Flow Limits for m/u filters, l/d coolers, demin.
How many gpm to turn over 1 rcs/day?
45 gpm min letdown flow = 1 RCS/day
80 gpm max per M/U filter
87.5 gpm max per L/D Cooler
123 gpm max per L/D Demin
What is CV-1223?
Letdown orifice bypass flow control valve
closed post trip to minimize letdown flow
fails closed on loss of IA
Where does PSV-1236 relieve to?
ABEDT
Letdown Demin T-36s - which is aligned, why?
What valves fail?
Max and Min flow?
- B is normally aligned, A is for Delith
- Inlet valves fail closed on loss of IA or loss of Y-02
- 25 gpm - 123 gpm
Discuss Letdown 3-way valve CV-1248 and any setpoints.
if MUT is 18”, 1248 auto realigns to letdown position
Feed/Bleed I/L prevents inadvertent dilution of RCS
Discuss Makeup filters F-3A/B
- Max diff press 75 psid, alarm at 25 psid
- Max Flow is 80 gpm per filter
- air to open, inlet valves fail closed on loss of power or IA
How does CV-1222 fail?
Fails as-is on loss of IA to revert to 45 gpm
Discuss Makeup tank T-4
-normal level 55-86 in
-Vent valve 1257 vents to vac degas and auto opens at 18” in T-4
ALSO aligns 1248 3-way valve to letdown if in bleed
-Relief valve at 100 psig, not designed to relieve water
-Lo/Hi press <10/>90psig
What is normal MUP discharge pressure?
2750psig
Discuss MUP ES actuation.
- ES 1 and 2
- MOD aligned to OP pump bus (a-3/4), Opposite train brkr open
- A & C pumps start after 5 second delay (EDG loading)
- B pump starts after 7 second delay IF A-3/4 MOD is closed, ‘A’/’C’ HPI not running, A-3/4 energized with normal volts
- HPI iso vavles open
- Recirc valves 1300 & 1301 close (min 55 gpm recirc on pump)
What does MUP suction relief valve lift @ and where to?
450 psig to the ABEDT
MUP electric oil pump auto starts when pump gets an ES signal and turns off __ seconds later
20 seconds
Aux lube oil pump starts at __ psig
6 psig
