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Systems > Recirc > Flashcards

Recirc Flashcards

1
Q

What is the purpose of the Reactor Recirculating System?

A

Provides forced circulation of water through the reactor core to achieve a higher power than it would through natural circulation.

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2
Q

Why are Reactor Pump Flows required to match?

A

Ensure assumptions of DBA LOCA analasis are maintainted.

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3
Q

What provides the cooling to the RR Pump Motor? to what component?

A

RBCCW to the Oil COoler

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4
Q

What happens to the RR Pump if RBCCW Cooling is lost?

A

Trip within 1 minute or pump bearings will get destroyed

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5
Q

RR Pump Seal Purge: what is its purpose?

What provides it? What is flow rate?

A

Seal purge provided by CRD flow to seal assemblies to remove dirt and prevent damage - approximately 2gpm

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6
Q

What must be done to RR when the pump is off and seal purge is lined up, and why?

A

must Leave RR discharge or suction valve open to prevent destroying seal.

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7
Q

What is the pressure of RR Seal 1 and 2? Alarm?

A

Seal 1 is 1000psig
Seal 2 is 500psig
Computer Alarm on Lo and HI pressure - 400/600

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8
Q

What happens to RR on a failure of Seal 1?

A

Seal 2 would approach seal 1 pressure and get hi pressure COMPUTER alarm

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9
Q

What happens to RR on a failure of Seal 2?

A

Seal 2 pressure will drop. get a seal 2 leak MCR annunciator alarm (0.25gpm) and lo press. computer alarm
THIS IS THE ONLY MCR ALARM - OTHERs are ONLY COMPUTER

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10
Q

What happens to RR on a failure of both seals?

A

Seal leakage limited to 60gpm by breakdown bushing. leak to DWFDS

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11
Q

What happens to RR on a plugging of Orifice 1?

A

Seal pressure 2 drops - no leakage alarm

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12
Q

What happens to RR on a plugging of orifice 2?

A

Seal 2 pressure increases. Computer alarm hi. Input to DWEDS increases No MCR Alarm

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13
Q

What is the power source for the RR Suction and Discharge vavles?

A

MMC 28-7/29-7

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14
Q

Will the RR Suction and Discharge Valves cause a RR Pump Trip?

A

Yes - if either is <90% open, the pump will trip

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15
Q

What will cause a RR Pump Anti-Cav Run Back? What happens?

A

If the Discharge valve is not full open (if it is between 90% and 100%) the RR pump will run back to min speed (30%) at a rate of 2.5%/second

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16
Q

What does the RR Run back protect against?

A

Axial thrust and cavitation issues

17
Q

What is the normal leakage from RR Seal? to where?

A

0.75gpm to DWEDS

18
Q

What is the minimum speed of the RR Pump and why? Rated flow?

A

Minimum speed of 30%, core rated flow of 98Mlbm/hr (with both pump). low speed limit based on ensuring adequate flow in lower head to prevent stratification of cool CRD water - preventing failure of CRD stube tube welds

19
Q

What is the limitation for rasing RR speed above 30%?

A

Cannot be done until feedwater flow >2Mlbm/hr and RR discharge valve full open.

20
Q

What other systems use the RR Suction and Discharge lines?

A

LPCI - EIther RR discharge depending on loop select
SDC - suction from eitehr or both RR Suction and returns to Recirc
RWCU - Suction from B Loop for U2; A Loop for U3
ISO condenser returns to vessel via A RR suction

21
Q

What is the purpose ofthe RR Sample flowpath?

A

Exists to continuously monitor pH, conductivity and O2

22
Q

When is the RR discharge valve “not full open” bypassed?

A

during start up - before it reaches “full open” position

23
Q

What positions exist for the RR Discharge Valve Jog Switch?

A

1/2 second, neutral, 1 second - opens for that amount of tiem then cuts out. Allows for better control of recirc flow

24
Q

What indication of the RR Suction and Discharge valves are required, what happens if not received?

A

Must have dual indication within 2 minutes or Pump must be tripped.

25
Q

What is the basic logic of the RR LOCA LOOP SELECT LOGIC?

A

Initiate on HI DW Pressure or Lo Rx Level - Uses Pp DP to determine if both Pps are in same running condition - then uses Riser DP to determine if there is a loop broken.

Chooses B unless B is broken

26
Q

What could happen with a failed jet pump?

Indicaitons of condition?

A 
May not ensure 2/3rd core height during LOCA.
Indicated by:
Decrease in Core Thermal Power
Decrease in MWe
Decrease in Core Plate D/P
27
Q

What Rx parameters indicate a trip of a SINGLE RR Pump?

A

increase flow in running loop jet pumps due to reduced back pressure.

28
Q

What must be done on a single RR Pump Trip? Why?

A

Close discharge valve to prevent pump spining backward

Reduce running pp to 60% on U3 and 43% on U3 to prevent excessive vibrations of jetpumps on subsequent Pp start

29
Q

What is the required Feedwater condition for RR Pump?

A

Feedwater flow must be >2Mlbm/hr before RR Pump allowed above 30%.

30
Q

Are the RR Seals and Gaskets considered part of the RCS Pressure Boundary?

A

NO

Systems (97 decks)

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