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EO1 > EO1 B2 Stator Cooling/H2/CO2 > Flashcards

EO1 B2 Stator Cooling/H2/CO2 Flashcards

1
Q

The purpose of the _____ system is to remove heat from the main generator windings and exciter rectifiers.

A. Hydrogen
B. Stator Cooling Water
C. Generator Seal Oil
D. lsophase Bus Cooling

A

B

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2
Q

Proper operation of the Stator Cooling Water system ensures __

A. exciter stator winding insulation integrity and cooling of the exciter rectifiers
B. exciter stator winding insulation integrity and cooling of the high voltage bushing connectors
C. main generator stator winding insulation integrity and cooling of the exciter rectifiers
D. main generator stator winding insulation integrity and cooling of the high voltage bushing connectors

A

C

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3
Q

Which ONE of the following identifies correct flowpath order of Stator Cooling Water system components during NORMAL operations?
Start at the Storage Tank Outlet.

  1. Temperature Control Valve
  2. Pressure Control Valve
  3. Storage Tank Debubbler
  4. Stator Cooling Water Pump
  5. Stator Cooling Water Heat Exchanger

A. 3, 4, 5, 2, 1
B. 4,5, 1,2,3
C. 4,5,2, 1,3
D. 5,2, 1,3,4

A

B

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4
Q

The Stator Cooling Water system is provided with a Pressure Regulator which has MINIMUM and MAXIMUM stops on it. The 37 psig CLOSED mechanical stop (1 ) and the 55 psig OPEN mechanical stop (2).

A. (1) prevents a complete loss of cooling flow
(2) reduces the potential for leakage into the Generator.
B. (1) reduces the potential for leakage into the Generator
(2) prevents a complete loss of cooling flow.
C. (1) prevents a complete loss of Service Water cooling
(2) prevents overpressurization.
D. (1) prevents a complete loss of cooling flow
(2) ensures at least 8 psig pressure differential from Hydrogen gas pressure.

A

A

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5
Q

The Stator Cooling Water Skid Pressure Control Valve (PDV 2495) functions to maintain Stator Coolant Water pressure ____ than Generator Hydrogen gas pressure.

A. 3 psi HIGHER
B. 8 psi HIGHER
C. 3 psi LOWER
D. 8 psi LOWER

A

C

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6
Q

Which ONE of the following statements describes Stator Cooling Water system indications available to the Control Room operator? (Excluding computer points).

A. ONLY annunciators are provided in the Control Room. NO parameter indicators are available.
B. Control Room indicators are available for the same parameters which are provided with local indicators.
C. Besides Control Room annunciators, the ONLY Control Room indicator available is Stator Cooling Water pump discharge pressure.
D. No Annunciators or parameter indications for the Stator Cooling Water System are located in the Control Room.

A

A

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7
Q

The Main Turbine will trip during a Loss of Stator Cooling Water runback if generator load is NOT less than ___ % within ____ minutes from the start of the runback.

A. 80, 2.0
B. 40, 2.5
C. 20, 3.5
D. 24, 2.0

A

A

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8
Q

The plant is operating at 100% power.
Which ONE of the following sets of annunciators will be in alarm on a loss of BOTH Stator Cooling Water Pumps?

  1. 14-6-D, ICS IN TRACK
  2. 15-4-B, EHC CABINET TRBL
  3. 15-5-B, EHC CTRL PANEL TRBL
  4. 16-1-G, STAT-CLNT LOSS T-G RNBK
  5. 16-2-B, FIELD CURRENT HIGH
  6. 16-2-F, STAT-CLNT INLET FLOW LO

A. 1, 2, 5
B. 1,4,6
C. 2, 3, 6
D. 3,4, 5

A

B

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9
Q

The Stator Cooling Water System three-way temperature control valve has lost its instrument air signal. How will the valve fail?

A. “As is”
B. Full flow thru the heat exchanger
C. Full bypass flow
D. Closed. Stop all flow

A

B

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10
Q

The plant is operating at 100% power The following conditions are observed: Annunciators
* STAT-CLNT CNDCT >0.5, 16-6-F in alarm
* STAT-CLNT CNDCT >9.9, 16-5-F in alarm
The Zone 2 Operator reports CIT 2463, Stator Winding Inlet Conductance and CIT 2464, Stator Winding Outlet Conductance are both indicating greater than 9.9 µS/cm
Which ONE of the following actions is correct, given these conditions?

A. Trip the Turbine
Go to DB-OP-02500, Turbine Trip
B. Verify makeup water is isolated
Refer to DB-OP-06209, Stator Cooling Water System Operating Procedure
C. Start a rapid shutdown
Go to DB-OP-02504, Rapid Shutdown
D. Trip the Reactor
Go to DB-OP-02000, RPS, SFAS, SFRCS Trip or SG Tube Rupture

A

C

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11
Q

The following plant conditions exist:
* Reactor power is 100%.
* All systems are in a normal lineup.
The following indication is observed
PS2476D, MN TURB GEN CASING (INLET WATER) TURBINE RUNBACK, has failed low.
Which one of the following is the expected plant response to this condition?
A. No effect on the plant because the turbine runback requires 2 out of 3 logic for low pressure
B. No effect on the plant because the runback is caused by low flow switches.
C. Turbine load will be reduced to less than 24% due to a single failure causing a runback.
D. Turbine will trip after 5 minutes due to the runback being blocked by the 2 out of 3 logic.

A

A

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12
Q

The purpose of using Hydrogen in the Main Generator is to transfer the heat generated in the
internals of the
A. Exciter to the Stator Cooling Water System

B. Exciter to the Turbine Plant Cooling Water System

C. Main Generator to the Component Cooling Water System

D. Main Generator to the Turbine Plant Cooling Water System

A

D

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13
Q

The purpose of the Carbon Diox

A. remove heat from the Main

B. allow an onsite source of C

C. provide a CO₂ fire suppression system for the Main Generator Seal Oil Room

D. provide a means for safely scavenging or filling the generator casing with hydrogen or air

A

D

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14
Q

During purging operations in preparations for maintenance on the Main Generator, Hydrogen

A. enters the top, CO₂ leaves the bottom

B. leaves the top, CO₂ enters the bottom

C. enters the bottom, CO₂ leaves the top

D. leaves the bottom, CO₂ enters the top

A

B

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15
Q

Which ONE of the following is correct concerning the hydrogen reserve bottles?

A. The hydrogen reserve bottles are pressurized from the hydrogen trailer.

B. The hydrogen trailer is kept pressurized from the hydrogen reserve bottles.

C. The hydrogen reserve bottles are used as a surge volume for the Main Generator.

D. The hydrogen reserve bottles are floated on the hydrogen header to maintain system pressure
during temperature fluctuations.

A

A

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16
Q

Which ONE of the following is correct with regard to why Hydrogen is used in the Main Generator?
(advantage)
A. Leaks easily, prevents oxidation, economical.

B. Economical, non-corrosive, explosive.

C. Good heat capacity, non-corrosive, economical.

D. Prevents oxidation of insulation, no windage losses, leaks easily.

A

C

17
Q

DB-OP-06210, CO2 and Hydrogen System Procedure, requires that hydrogen purity be maintained greater
than 75%.
Which ONE of the following is the basis for this requirement?

A. The main generator is at risk of exploding.

B. The seal oil breaks down.

C. The heat generated at full load cannot be removed.

D. We are ensured the hydrogen purity meter is working properly.

A

A

18
Q

Which ONE of the following is the location of the in-plant generator alarm panel?

A. Turbine Building 632’, North West corner

B. Turbine Building 603’, under generator

C. Turbine Building 585’, under generator

D. Turbine Building 585’, Aux. Boiler Panel

A

C

19
Q

When working with the Hydrogen and CO₂ System which ONE of the following combinations of
indications is available from the Control Room?
A. Machine gas pressure, machine gas temperature.

B. Machine gas temperature, hydrogen purity.

C. Hydrogen purity, gas analyzer flow.

D. Machine gas pressure, hydrogen purity.

A

D

20
Q

Annunciator 16-2-E, H2 GAS PURITY LO alarms. The operator can determine hydrogen purity

A. locally ONLY

B. ONLY in the Control Room

C. BOTH in the control room and locally

D. by computer point ONLY

A

C

21
Q

Which ONE of the following is NOT on the local Generator Hydrogen Alarm Panel 39?

A. GEN H2 GAS PRESS

B. GEN GAS MONITOR

C. GEN H2 GAS PURITY LOW

D. GEN H2 GAS COLD TEMP. HI

A

B

22
Q

The plant is operating at 100% The following Annunciators alar
* 16-5-E, GEN CASING LI

  • 16-6-H, H2 DETRAINING

These alarms could

A. indicate a hydrogen leak in

B. cause overheating of the high voltage bushings.

C. restrict stator cooling due to leakage.

D. indicate a problem with turbine lube oil.

A

B

23
Q

Annunciator 16-2-E, H2 GAS PURITY LO alarms. The operator can determine hydrogen purity

A. locally ONLY.

B. ONLY in the CTRM.

C. BOTH in the control room and locally.

D. by computer point ONLY.

A

C

24
Q

During a plant tour you notice high level in the Generator Liquid Detector. Upon draining the
fluid, you discover that it is oil.

Which ONE of the following sources would allow oil into this detector?

A. Seal oil

B. Exciter bearing oil

C. Main Turbine lube oil to bearings

D. Main Turbine lube oil to lift pumps

A

A

25
Q

The plant is operating at 100% power. The following indications are observed:
* Hydrogen leakage has been determined to be 1470 scfd (three times normal).
* Hydrogen purity is 98%.

  • Machine gas pressure is 60 psig.

Which ONE of the following describes the actions that are to be performed?

A. Shutdown the Auxiliary Boiler, if operating.

B. Shutdown the Main Generator.

C. Isolate the outside hydrogen bottles.

D. No action is required, temperature fluctuations will cause this.

A

A

26
Q

The Main Generator has been purged and contains air. Which ONE of the following describes how
Hydrogen is normally prevented from entering the casing under these conditions?
A. The casing is kept pressurized to 100 psig to preclude a b.P for entry of Hydrogen.

B. The Hydrogen line is disconnected and vented at its supply at the Hydrogen trailer.

C. The spool piece is removed from the Hydrogen supply line and the supply line is blank flanged.
D. A freeze seal is placed on the Hydrogen supply line to prevent leakage of Hydrogen into the
casing.

A

C

EO1 (14 decks)

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