NOP Flashcards

1
Q

What is the basis for not being critical with RCS Tavg belting less than 541*F?

A

MTC is within its analyzed temp range

Protective instrumentation is within its normal operating rage

PRZ is capable of being in an operable state w a steam bubble

Rx Vessel is above its minimum RTNDT temperature

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2
Q

What are the rod withdrawal rate limits for > 50% power?

A

3 steps per hour only when increasing power more than 1% / hr

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3
Q

What are the rod withdrawal rate limits for a conditioned power level > 50%?

A

Unrestricted up to conditioned power level AND then 3 steps per hour when increasing above conditioned power level

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4
Q

What are the rod withdrawal rate limits for > 75% Power?

A

Not to exceed6 steps per hour if needed to maintain AFD within +/- 3% of target value

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5
Q

For initial power ascension following refueling, what is the limit for = 50% Power?

A

No limit beyond UFSAR

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6
Q

FOr initial power ascension following refueling, what is the limit for > 50% power?

A

3% full power per hour

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7
Q

What is the initial power ascension following refueling for a conditioned power level > 50%?

A

10% full power per hour up to that conditioned Power level and then 3% full power per hour above conditioned power level

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8
Q

How does using spray minimize boring concentration difference?

A

Enhances mixing of PRZ and RCS

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9
Q

What could happen if PRZ concentration is different than RCS concentration?

A

Outsure to the RCS. It may be borate or diluted, causing a RCS Temperature transient

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10
Q

After tripping the Rx, how long will it take for SR to energize?

A

10-15 mins

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11
Q

During a RCS Cooldown, how is a continuous PRZ outsurge maintained?

A

Energize all PRZ backup heaters (continuous spray flow)

Maintain Net Charging flow within required limits

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12
Q

Why do you want to maintain a continuous PRZ outsurge during RCS Cooldown?

A

Minimizes thermal stresses on PRZ surge line

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13
Q

How many RCPs are required to be in operation with Tave > 541*F? Why?

A

All 4

Ensures protective instrumentation associated with the loops are operable

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14
Q

When is an RCS Sample for iodine required?

A

Load Reduction of 15% in 1 hour

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15
Q

If U2 is in mode 5 and the East RHR pump is in service, how is letdown flow affected if the RHR pump is lost?

A

LD flow is reduced due to loss of RHR pump discharge pump

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16
Q

Why is 600 gpm of RHR diverted to the HLs?

A

To ensure Loop 3 HL remains subcooled uring PRZ Outsurge

17
Q

What is more limiting, RCS Heat up or Cool down? And Why?

A

Cool down - due to addition of tensile stresses on the inside vessel wall where allowable stress is the lowest

18
Q

Why must NLI-151 be used with a correction figure during cool down to determine PRZ Level?

A

Cold Cal indicator compares the weight of the water in the PRZ vs the weight in the ref column. The cold cal was calibrated at 150*F, so there may be a density difference between the reference and the cold cal

19
Q

What is the maximum RHR flow rate at reduced inventory? Why?

A

4,000 gpm to prevent air entrainment / vortex is and loss of RHR Pump

20
Q

Why is there only 1 RHR pump running at a time during half loop?

A

To prevent air entrainment

21
Q

What mode must we be in to remove power from RHR Suction valves?

A

Mode 5 to prevent closure. Must have power available in M4 for possible LOCA

22
Q

How much heat is added from all 4 RCPs?

A

12-14 MW

23
Q

What are the TS Limits for heatup of the RCS and PRZ?

A

RCS - 60*F / hr

PRZ - 100*F / hr

24
Q

Why is Hydrogen used to cool the main generator?

A

High thermal conductivity

Low windage losses

Non conductive

Non corrosive

Cheap

25
Q

Criticality occurs in approximately how many doublings?

A

5 to 7

26
Q

When is criticality declared?

A

Rx is actually super-critical, indicated by:

Constant + SUR
Rising Neutron counts rate without rod motion

27
Q

What is the SUR admin limit during startup when < / = 10E-8 amps?

A

0.5 DPM

28
Q

What is the SUR admin limit during startup when > 10E-8 amps?

A

0.25 DPM

29
Q

What is the rod withdrawal limit above POAH?

A

3 steps at a time until associated reactivity effects are complete

30
Q

What happens if you add positive reactivity when critical but below POAH?

A

Power rises until POHA or sufficient negative reactivity is added to stop the power rise

31
Q

What must be done if criticality occurs below the rod insertion limit?

A

Emergency borate until SDM > 1.3% is achieved

Open Trip Breakers and Verify Rod bottom lights lit

32
Q

What happens if criticality occurs outside the -1000 and +500 pcm limits?

A

Trip Rx

33
Q

Does the Control Air Compressor Load Shed?

A

NO!!!!!! But the PAC does.