[AS] - Auxiliary Steam Flashcards

1
Q

Why do we send [AS] to MSRs?

A

-steam blanket while the MT is offline
-prevent tube corrosion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

[AS]

When would you use [AS] to provide [GS] to the Main Turbine and MFWPs?

Aux Feed
Main Feedwater Pumps

A

-unit startup

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

[AS]

What does [AS] provide overspeed testing for?

(2)

A

Main FW Pumps

‘A’ [AF] Pump

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

[AS]

[SG] provides steam to [AS] through pressure reducing valves during Normal Ops. What supplies this during shutdown/startup?

A

[AS] of another operating unit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

[AS]

What is the typical pressure for Main Steam and what pressure does it get reduced to for use in [AS] ?

A

1000-1150 psig

to 250 psig

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

[AS]

What pressure will [AS] reliefs lift?

A

275 psig

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

[AS]

[AS] pressure is reduced again to 50 psig for use by what components?

(3)

A

[LR]
Gas stripper
BAC
Evaporator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What pressure is [AS] reduced before being sent to MSRs for steam blanketing?

A

52.3 psig

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

[AS]

What does RU-7 monitor?

A

[AS] Condensate Receiver Tank

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What does [NH] power in [AS]? What happens if we lose [NH]?

A

-Condensate Receiver Transfer Pumps

1- [AS] in AB secured until power is restored
2- Gas stripper, Evaporator, and BAC will be OOS

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

[AS]

What does [NC] do for [AS]?
What happens if we lose [NC]?

A

[AS] Vent Condenser cooling

-[AS] to AB secured until [NC] is restored

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

[AS]

[AS] and loss of [SQ] ?

[SQ] Radiation Monitoring System

A

sample Condensate before sending back to the main condenser

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

[AS]

If [AS] system condensate drains are contaminated, where are they sent to?

A

[LR] Liquid Radwaste

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

[AS]

Why do we establish a steam blanket in the MSRs during a shutdown?

A

-corrosion inhibition

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

[AS]

What is the Condensate Receiver volume? Design operating pressure?

A

335 gallons

50 psig

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

[AS]

What is the purpose of the [AS] Vent Condenser?

A

-Condenses steam which would otherwise vent to atmosphere and returns it to the receiver

17
Q

[AS]

What cools the [AS] Vent Condenser?

(Tube Side)

A

[NC] Nuclear Cooling Water

18
Q

[AS]

What is the purpose of the [AS] Condensate Transfer Pump min flow lines?

A

-Returns 5 gpm to the receiver
-prevents pump from overheating

19
Q

[AS]

Where is the Condensate Receiver Package located?

A

AB 51’ 6”

20
Q

What will happen if RU-7 detects high radioactivity in the condensate?
What must be done when the condition clears?

A

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.

21
Q

How do ASN_RV-11A and -11B fail upon a loss of instrument air?

A

RV-11A fails closed, RV-11B fails open

22
Q

What is auto feature associated with [AS] supply valves to [LR] BAC, Evap, and gas stripper, AS-PV-331 and -332? What activates it?

A

-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

23
Q

During all modes of operation, [AS] can provide low pressure steam to what equipment?

A

gas stripper

LR evaporator

BAC

24
Q

If a unit is receiving [AS] from another unit, where does the condensate go?

A

-sent to the [CD] receiver package and returned to the main [CD] of the unit supplying the [AS]

25
What makes up the [AS] condensate receiver package?
receiver tank vent condenser 2 [AS] condensate transfer pumps
26
Where does [AS] vent condenser send non condensable gases?
[HA] AB HVAC
27
Where does the AS condensate from the turbine building drain to?
main condenser
28
How does the AS system interface with the ED (feedwater heater extraction steam and drain) system?
AS sends aux steam condensate drains to the ED blowdown stack
29
describe the manual and auto controls of the AS condensate transfer pump.
manual: local three position switch- start, stop and auto Auto: controlled through alternator and level switches (hi-hi, lo-lo, high and low)
30
All AS steam is eventually condensed, with one exception. What happens to the steam after it leaves the A aux. feedwater pump turbine?
exhausted to atmosphere
31
Normally, all units have their AS systems cross-tied, With one unit having ASN-V015 open and the other two have ASN-V014 open. What is the purpose of this?
allows a rapid restoration of turbine GS steam via the cross tie in the event of a MSIS
32
Define water hammer. What causes it?
Pressure change in a closed system resulting from a change in liquid velocity. Change in liquid momentum exerts an impulse (F*t) on the liquid, and the associated energy change dissipates as a pressure shock wave. This shock wave travels at the speed of sound in the liquid. rapid throttling of valves, introducing liquid to a voided line, steam/water interfaces where condensing steam may suddenly remove a resistance to flow of either liquid or seam