[AS] - Auxiliary Steam Flashcards
Why do we send [AS] to MSRs?
-steam blanket while the MT is offline
-prevent tube corrosion
[AS]
When would you use [AS] to provide [GS] to the Main Turbine and MFWPs?
Aux Feed
Main Feedwater Pumps
-unit startup
[AS]
What does [AS] provide overspeed testing for?
(2)
Main FW Pumps
‘A’ [AF] Pump
[AS]
[SG] provides steam to [AS] through pressure reducing valves during Normal Ops. What supplies this during shutdown/startup?
[AS] of another operating unit
[AS]
What is the typical pressure for Main Steam and what pressure does it get reduced to for use in [AS] ?
1000-1150 psig
to 250 psig
[AS]
What pressure will [AS] reliefs lift?
275 psig
[AS]
[AS] pressure is reduced again to 50 psig for use by what components?
(3)
[LR]
Gas stripper
BAC
Evaporator
What pressure is [AS] reduced before being sent to MSRs for steam blanketing?
52.3 psig
[AS]
What does RU-7 monitor?
[AS] Condensate Receiver Tank
What does [NH] power in [AS]? What happens if we lose [NH]?
-Condensate Receiver Transfer Pumps
1- [AS] in AB secured until power is restored
2- Gas stripper, Evaporator, and BAC will be OOS
[AS]
What does [NC] do for [AS]?
What happens if we lose [NC]?
[AS] Vent Condenser cooling
-[AS] to AB secured until [NC] is restored
[AS]
[AS] and loss of [SQ] ?
[SQ] Radiation Monitoring System
sample Condensate before sending back to the main condenser
[AS]
If [AS] system condensate drains are contaminated, where are they sent to?
[LR] Liquid Radwaste
[AS]
Why do we establish a steam blanket in the MSRs during a shutdown?
-corrosion inhibition
[AS]
What is the Condensate Receiver volume? Design operating pressure?
335 gallons
50 psig
[AS]
What is the purpose of the [AS] Vent Condenser?
-Condenses steam which would otherwise vent to atmosphere and returns it to the receiver
[AS]
What cools the [AS] Vent Condenser?
(Tube Side)
[NC] Nuclear Cooling Water
[AS]
What is the purpose of the [AS] Condensate Transfer Pump min flow lines?
-Returns 5 gpm to the receiver
-prevents pump from overheating
[AS]
Where is the Condensate Receiver Package located?
AB 51’ 6”
What will happen if RU-7 detects high radioactivity in the condensate?
What must be done when the condition clears?
Condensate will be directed to the [LR] TDS holdup tanks
ASN-RV-11A must be manually reset by lifting the latch lever upward until it engages with the latch.
How do ASN_RV-11A and -11B fail upon a loss of instrument air?
RV-11A fails closed, RV-11B fails open
What is auto feature associated with [AS] supply valves to [LR] BAC, Evap, and gas stripper, AS-PV-331 and -332? What activates it?
-trip shut on a ruptured [AS] line in AB, CST pipe tunnel, or HUT tunnel
-20 pressure switches scattered throughout the building (1.0 +/- 0.1 psig)
Valves manually reset by lifting latch lever
During all modes of operation, [AS] can provide low pressure steam to what equipment?
gas stripper
LR evaporator
BAC
If a unit is receiving [AS] from another unit, where does the condensate go?
-sent to the [CD] receiver package and returned to the main [CD] of the unit supplying the [AS]