[AS] - Auxiliary Steam

Question 1

Why do we send [AS] to MSRs?

Answer 1

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

Question 2

[AS]

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

Aux Feed
Main Feedwater Pumps

Answer 2

-unit startup

Question 3

[AS]

What does [AS] provide overspeed testing for?

(2)

Answer 3

Main FW Pumps

‘A’ [AF] Pump

Question 4

[AS]

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

Answer 4

[AS] of another operating unit

Question 5

[AS]

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

Answer 5

1000-1150 psig

to 250 psig

Question 6

[AS]

What pressure will [AS] reliefs lift?

Answer 6

275 psig

Question 7

[AS]

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

(3)

Answer 7

[LR]
Gas stripper
BAC
Evaporator

Question 8

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

Answer 8

52.3 psig

Question 9

[AS]

What does RU-7 monitor?

Answer 9

[AS] Condensate Receiver Tank

Question 10

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

Answer 10

-Condensate Receiver Transfer Pumps

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

Question 11

[AS]

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

Answer 11

[AS] Vent Condenser cooling

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

Question 12

[AS]

[AS] and loss of [SQ] ?

[SQ] Radiation Monitoring System

Answer 12

sample Condensate before sending back to the main condenser

Question 13

[AS]

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

Answer 13

[LR] Liquid Radwaste

Question 14

[AS]

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

Answer 14

-corrosion inhibition

Question 15

[AS]

What is the Condensate Receiver volume? Design operating pressure?

Answer 15

335 gallons

50 psig

Question 16

[AS]

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

Answer 16

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

Question 17

[AS]

What cools the [AS] Vent Condenser?

(Tube Side)

Answer 17

[NC] Nuclear Cooling Water

Question 18

[AS]

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

Answer 18

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

Question 19

[AS]

Where is the Condensate Receiver Package located?

Answer 19

AB 51’ 6”

Question 20

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

Answer 20

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.

Question 21

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

Answer 21

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

Question 22

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

Answer 22

-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

Question 23

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

Answer 23

gas stripper

LR evaporator

BAC

Question 24

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

Answer 24

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

Question 25

What makes up the [AS] condensate receiver package?

Answer 25

receiver tank
vent condenser
2 [AS] condensate transfer pumps

Question 26

Where does [AS] vent condenser send non condensable gases?

Answer 26

[HA] AB HVAC

Question 27

Where does the AS condensate from the turbine building drain to?

Answer 27

main condenser

Question 28

How does the AS system interface with the ED (feedwater heater extraction steam and drain) system?

Answer 28

AS sends aux steam condensate drains to the ED blowdown stack

Question 29

describe the manual and auto controls of the AS condensate transfer pump.

Answer 29

manual: local three position switch- start, stop and auto

Auto: controlled through alternator and level switches (hi-hi, lo-lo, high and low)

Question 30

All AS steam is eventually condensed, with one exception. What happens to the steam after it leaves the A aux. feedwater pump turbine?

Answer 30

exhausted to atmosphere

Question 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?

Answer 31

allows a rapid restoration of turbine GS steam via the cross tie in the event of a MSIS

Question 32

Define water hammer. What causes it?

Answer 32

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