4501 & 4502

Question 1

Why should the Integrity status tree be disregarded during E-3?

Answer 1

False reading possible in ruptured loop CL indication w no RCPs during a SGTR. This is because of pooling.

Question 2

Why will SG Level rise more quickly with RCPs tripped?

Answer 2

Less heat transfer because the SG is not steaming as much.

Question 3

Why is there an overfill concern during a SGTR with no RCPs?

Answer 3

Loop transport times will result in a slower cool down

Question 4

When cooling down in E-3 using the dumps, what should you not do? And why!?

Answer 4

Do NOT use Turbo bc it can cause a SLI

Question 5

What is the purpose of getting the Pressurizer to the saturation temperature of the ruptured SG pressure?

Answer 5

To minimize flow between the RCS and SGs

Question 6

What is the equation for figuring out a new leak rate after a change in pressure?

Answer 6

Leak 2 / Leak 1 = (square root of DP2) / (square root of DP1)

Question 7

If you lose 2 PR NIs, what happens?

Answer 7

It takes out your source range and will trip you during a start up (

Question 8

What are OTDT inputs?

Answer 8

DT
Tave
AFD
Pzr pressure

Question 9

What does OTDT protect from?

Answer 9

DNB

Question 10

What are the inputs to OPDT?

Answer 10

DT

Tave

Question 11

What does OPDT protect from?

Answer 11

KW/Ft

Question 12

At 8% power and under compensated, what does this look like? Why?

Answer 12

Both intermediate range NIs look the same because neutrons are overwhelming.

Question 13

After a trip, what do the intermediate range NIs look like if one was under compensated? What does this prevent?

Answer 13

The NI that is under compensated will give a false high indication. The intermediate range current will stay above the P6 setpoint, preventing the source range detectors from auto energizing

Question 14

What is the back up auto deenergization for the source range NIs?

Answer 14

P10

Question 15

At 100% power, what happens if a power range NI fails off scale high?

Answer 15

Rods will insert, but they will not come back out because of the C2 Rod stop

Question 16

When above the point of adding heat, what does moving rods cause?

Answer 16

The reactor power will follow steam demand

Question 17

When below the point of adding heat, what will moving rods do?

Answer 17

Adds reactivity, but no effects are seen

Question 18

What does bank overlap provide?

Answer 18

More uniform AFD and more uniform differential rod worth

Question 19

What is QPTR for?

Answer 19

Radial flux

Question 20

What will a dropped rod affect?

Answer 20

QPTR AND RADIAL FLUX

Question 21

What will maintaining a AFD and QPTR do for us?

Answer 21

It will maintain power density and DNB in spec

Question 22

If above 90% power and not within the target band what must we do per tech spec?

Answer 22

Get back within target band or below 90% power within 15 minutes

Must be either less than 90% or back within target band within an additional 15 minutes

If you cannot accomplish target band within a total of 30 minutes, you must be under 90% power!

Question 23

What happens to voltage and current if you lose a battery charger and you were on the battery?

Answer 23

Voltage will go down

Current will go up

Question 24

How long is the 250 V DC battery good for during a loss of offsite power?

Answer 24

3 hrs

Question 25

How long is the 250 V DC battery good for during a Station black out?

Answer 25

4 hrs

Question 26

If you have CCW in or out leakage when on RHR, what must you do within one hour?

Answer 26

SDM

Question 27

If there is a fire on the unit one main transformer, how many fire pump should be running?

Answer 27

2

Question 28

What are the manual actions that must be taken during a main transformer fire if parallel to the grid?

Answer 28

Trip the generator and verify deluge actuates Turbine trip if < P8 Reactor trip if > P8

Question 29

If the control room is destroyed and you are in the SAMGs, what would you prioritize the use of an AEO for?

Answer 29

Starting TDAFP

Question 30

What would be an entry condition for SAMGs?

Answer 30

CETCs >1200 degrees

Question 31

During SAMGs, why is it important to maintain SG Level?

Answer 31

To prevent creep rupture failure

Question 32

During a large break LOCA, what are the consequences if the contents of the spray add tank are not used?

Answer 32

Iodine will not be kept in solution

Question 33

During a large break LOCA, what happens if too much of the spray add tank contents are put in?

Answer 33

Chloride and caustic stress corrosion of equipment can occur

Question 34

Which Signal causes a CTS pump to start?

Answer 34

Phase B

Question 35

Which signal causes the valves to realign for the CTS system?

Answer 35

CTS signal

Question 36

If unable to verify natural circulation, what should be done?

Answer 36

Raise steam demand. Dump more steam with the steam dumps

Question 37

What can interrupt natural circulation?

Answer 37

Voids. Monitor using the NR RIVLIS

Question 38

What is the potential outcome from over filling the steam generators in E3?

Answer 38

May rupture the main steam line from weight of water and water hammer. This could damage the PORVs, safeties and TDAFP as well

Question 39

Why is the SG PORV’s set point changed to 1040 psig during E3?

Answer 39

Minimize release

Question 40

When in E3, under what conditions is there a release in progress?

Answer 40

ALWAYS!

Question 41

Which factor of the 5 factor formula is affected most by control rods?

Answer 41

Thermal utilization factor

Question 42

What happens to control rod worth as moderator temperature rises?

Answer 42

It goes up

Question 43

What happens to rod worth over core life? Why?

Answer 43

Rod worth goes up. Less boron due to fuel burn out, less competition between the control rods and boron, and neutrons are more likely to be absorbed by the control rod

Question 44

What do you rod insertion limits ensure?

Answer 44

That rods will be more withdrawn as reactor power rises to compensate for the change in power defect

Question 45

What will cause the reactor to trip on the loss of 250 V DC?

Answer 45

RCP Bus under frequency because 250 V DC powers it’s relays

Question 46

What is the input to the main feed pump DP program variable support

Answer 46

Total steam flow

Question 47

What point does the rod insertion limit comparator use?

Answer 47

Auctioneered High Delta T power

Question 48

At the bottom of the core is DNBR higher or lower? Why?

Answer 48

Higher because temperature is cooler

Question 49

Where in the core is DNBR the lowest?

Answer 49

Upper mid plane because more heat flux is occurring in that region

Question 50

What is the purpose for the basis for the limit on maximum linear power density?

Answer 50

To provide assurance of fuel integrity

Question 51

What are the dose limits for EDMGs?

Answer 51

5 Rem Whole body for damage assessment 10 Rem whole Body per incident to protect valuable equipment 25 Rem whole body lifetime for lifesaving

Question 52

If you manually actuate the CTS gold switches, what happens?

Answer 52

CTS signal Phase B signal CVI NO Steam line isolation!

Question 53

Where is the 2.8 psi sensed that gives you a CTS, SLI and phase B signal?

Answer 53

2/4 in LOWER containment

Question 54

Which valves reposition on a CTS signal?

Answer 54

CTS pump discharge valves and the spray add tank valves. Heat exchanger valves only reposition when also on recirc sumo

Question 55

What will the spray add tank lo lo level do?

Answer 55

Closes the spray add tank outlet valves and eductor valves

Question 56

Why should the hydrogen Recombiners not be started while in modes 1-4?

Answer 56

Concerns with overloading the EDG

Question 57

Why are the CRDM fans placed in stop and lower containment fans placed to off during CTS?

Answer 57

To prevent them from restarting when phase B is reset, does possibly overloading the EDG

Question 58

Why wait 50 mins to put RHR spray in service when only having one train of CTS?

Answer 58

Because decay heat is low enough that one safety injection pump and one charging pump are sufficient to cool the core

Question 59

What happens to pressure and flow when centrifugal charging pumps are in series?

Answer 59

More pressure

Question 60

What happens to pressure and flow when centrifugal charging pumps are in parallel?

Answer 60

More flow

Question 61

What happens when positive displacement pumps are in series?

Answer 61

No change in Flow

Question 62

What happens to positive displacement pumps when in parallel?

Answer 62

Flow is additive

Question 63

What are the pump laws?

Answer 63

Flow ~ Speed Head ~ Speed ^2 Power ~ Speed ^3

Question 64

When should RCPs be stopped for the best natural circulation flow?

Answer 64

Closer to the trip

Question 65

What cools the head during natural circulation?

Answer 65

CRDM Fans