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B33 > General > Flashcards

General Flashcards

1
Q

What provides the NPSH requirements for Fast Speed Reactor Recirculation Pumps?

A

1) Height of water in the Downcomer.

2) Subcooled Feedwater Flow.

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2
Q

What provides the NPSH requirements for Slow Speed Reactor Recirculation Pumps?

A

Height of water in the Downcomer.

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3
Q

What is the purpose of the Reactor Recirculation System?

A

1) Provide forced recirculation flow through the core to allow higher power levels than with natural circulation.
2) Allow power changes without the use of control rods.
3) Provide a floodable volume(2/3) core height.

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4
Q

What is the ratio of driving to driven flow in the Reactor Recirculation Sytem?

A

1 third driving flow, 2/3 driven flow.

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5
Q

What is the recirculation ratio in the Reactor Vessel(water entering the Downcomer from the Separator/Dryer compared to Feedwater)?

A

6:1

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6
Q

Which loop of Reactor Recirculation does RHR Shutdown Cooling utilize?

A

Recirculation Loop B

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7
Q

Which loop of Reactor Recirculation does Reactor Sampling utilize?

A

Recirculation Loop A

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8
Q

Which loop of Reactor Recirculation does Reactor Water Cleanup utilize?

A

Both loops of Recirculation, and the Bottom Head Drain line.

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9
Q

What type of mechanical seal do the Reactor Recirculation Pumps have?

A

Two identical pressure seals in one cartridge that share the load for sealing the pump shaft.

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10
Q

What is the seal purge flow rate into each seal cartridge, and what is the flow through the stages?

A

The flow rate into seal number one is 2 gpm, 1. 25 gpm goes into the Recirculation system, and 0.75 gpm flows into seal number 2 through a pressure breakdown coil allowing the stages to share the pressure load. Seal water flows out of the second stage through a pressure breakdown coil to the Drywell Equipment Drain Sump.

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11
Q

What are the normal pressures for each seal stage?

A

1) Seal number 1(inner seal) normal pressure is 1000 psig.

2) Seal number 2(outer seal) normal pressure is 500 psig.

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12
Q

What are the indications of an Inner Seal failure?

A

Outer Seal pressure increases to approximately system pressure(1000 psig). There will also be an increase in the staging flow through the second stage pressure breakdown coil.

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13
Q

What are the indications of an Outer Seal failure?

A

Seal pressure in the Outer Stage will decrease, and you will receive an Outer Seal leak detection line High Flow alarm.

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14
Q

What are the indications of both seals failing on a Reactor Recirculation Pump?

A

Leakage past the outer seal will increase, but is limited to 50 gpm. Pressure will decrease on both seals, and inner stage flow will increase.

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15
Q

What is the power supply for fast-speed Reactor Recirculation pumps?

A

A - L11, B - L12

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16
Q

What is the power supply for slow-speed Reactor Recirculation Pumps?

A

A - H11 through LFMG A

B - H12 through LFMG B

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17
Q

What are the speeds, voltages, and frequencies for Reactor Recirculation Pumps in Fast and Slow speed?

A

Fast - 1800 rpm, 13800 volts, and 60 Hz

Slow - 450 rpm, 1250 volts, and 15 Hz

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18
Q

What Reactor Recirculation Pump components are cooled by Nuclear Closed Cooling?

A

1) Recirculation Pump Seal Cooler
2) Recirculation Pump Motor Cooler
3) Recirculation Pump Upper Bearing Oil Reservoir Cooler
4) Recirculation Pump Lower Bearing Oil Reservoir Cooler

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19
Q

What is the rated flow rate for a Reactor Recirculation Pump?

A

42,000 gpm

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20
Q

How many Jet Pumps are there?

A

20 total Jet Pumps, ten supplied by each Reactor Recirculation Pump.

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21
Q

What are the power supplies to the Reactor Recirculation Hydraulic Power Units?

A

HPU A Subloop #1 - F1D05
HPU A Subloop #2 - F1C06
HPU B Subloop #1 - F1D05
HPU B Subloop #2 - F1C06

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22
Q

What components make up a Reactor Recirculation HPU?

A

Each Subloop contains:

1) One suction strainer
2) One hydraulic pump
3) One nitrogen accumulator
4) One air cooled oil cooler
5) Three spool valves
6) Various isolation valves
7) One pump discharge filter(high pressure)
8) One Fuller’s earth filter

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23
Q

What are the three flow paths in a Reactor Recirculation HPU?

A

All flow paths return to the reservoir

1) Oil cooler flow path 120 F - 140 F
2) Fuller’s earth filter flow path
3) Backpressure regulator flow path

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24
Q

What is the purpose of the HPU nitrogen accumulator?

A

The accumulator absorbs system pressure changes.

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25
Q

What is the purpose of the HPU Shuttle Valve?

A

The Shuttle Valve positions to isolate the running Subloop from the Subloop in standby.

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26
Q

What is the purpose of the HPU Lockout Valves?

A

The Lockout Valves are located on the Flow Control Valve actuator. When oil flow is received from the Shuttle Valve the Lockout Valves will allow flow to pass to position the FCV. When flow from the Shuttle Valve is lost the Lockout Valves prevent motion by producing a hydraulic lock.

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27
Q

What is the purpose of the HPU Pilot Operated Isolation Valves(Servo Block Valves)?

A

When the Subloop is running, oil from the Solenoid Operated Isolation Valves compresses a spring to position this valve so oil is allowed to flow to the actuator.

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28
Q

What is the purpose of the HPU Solenoid Operated Isolation Valves?

A

The Solenoid Operated Isolation Valves provide an interface between the electronic logic and the HPU isolation circuits. When the valve is energized oil is directed to a pilot line via the Shuttle Valve, and oil is also directed to open the Pilot Operated Isolation Valve.

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29
Q

How does a Reactor Recirculation HPU fail, and why?

A

When the HPU is shutdown the Flow Control Valve will fail “AS-IS” due to a hydraulic lock which is created by both the Lockout Valves and the Pilot Operated Isolation Valves isolating flow to/from the actuator.

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30
Q

What type of valve is the Reactor Recirculation Flow Control Valve?

A

The Flow Control Valve is a 24 inch, hydraulically operated, V-notch type ball valve.

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31
Q

What is the corresponding flow percentage change for the Flow Control Valve stroke from 0 to 100 percent?

A

22% flow to 100% flow

32
Q

What is the flow equivalent of 17% Flow Control Valve position?

A

48 % Drive Flow, which is approximately 60-65% power at 100% Load Line.

33
Q

What is the location of the Reactor Recirculation A HPU?

A

Containment 620’

34
Q

What is the location of the Reactor Recirculation B HPU?

A

Containment 630’

35
Q

What will cause an operating Reactor Recirculation HPU Subloop to automatically shift to the standby loop?

A

1) Pressure low(1650 psig for >0.5 seconds)
2) Low oil reservoir level(70 gallons)
3) Overcurrent/Undervoltage
4) Warm oil(>145 F)
5) Velocity error(Hi/Low)

36
Q

What will cause an operating Reactor Recirculation HPU to automatically trip?

A

1) Low discharge pressure(1650 psig), with the other Subloop in MAINTENANCE.
2) Oil empty(60 gallons)
3) Overcurrent/Undervoltage, with the other Subloop in MAINTENANCE.
4) High oil temperature(150 F)
5) Velocity error high/low
6) Position demand high/low
7) Velocity feedback high/low
8) Position feedback signal rate-of-change high
9) Instability(velocity deviation error oscillations)

37
Q

What is the Flow Control Valve maximum rate of speed in accordance with Technical Specifications?

A

In accordance with surveillance requirements the FCV speed in the open and close direction shall be less than or equal to 11% OF STROKE per second.

38
Q

What is the value for the Low Feedwater Flow Reactor Recirculation Pump downshift?

A

3.43 Mlbm/hr for 15 seconds

39
Q

How does the Low Feedwater Flow Interlock affect Reactor Recirculation Pump operation?

A

The 5 breakers will trip and a downshift is initiated. This will also prevent a fast speed start, or shift from slow to fast.

40
Q

Is it possible to start, or shift, the Reactor Recirculation Pumps in/to fast speed with the Low Feedwater Flow interlock locked in?

A

NO, a fast speed shift or start is prevented.

41
Q

What is the purpose of the Low Feedwater Flow Interlock Bypass Switch, and when is it used?

A

The Low Feedwater Flow Interlock Bypass switch is used during shifts from to the slow to fast speed to prevent inadvertent downshift signals caused by flow oscillations.

42
Q

How does the Low Steam Dome to Pump Suction Differential Temperature Interlock affect Reactor Recirculation Pump operation?

A

The 5 breakers will trip, and a downshift to slow speed is initiated. This will also prevent a fast speed start, or a shift from slow to fast.

43
Q

What is the value for the Low Steam Dome to Pump Suction Differential Temperature Interlock?

A

Differential temperature less than 10 F for 15 seconds.

44
Q

When is the Low Steam Dome to Pump Suction Differential Temperature Interlock Bypass Switch utilized?

A

These key Lock switches are normally placed in bypass when power is greater than 60 percent.

45
Q

What are the Reactor Recirculation Sampling Valve isolation signals?

A

1) Main Steam Line High Radiation(3X High)

2) RPV Level 2(130 inches)

46
Q

What component is protected by the Low Steam Dome to Pump Suction Differential Temperature Interlock?

A

The Reactor Recirculation Pumps and the Jet Pumps.

47
Q

What component is protected by the Low Feedwater Flow Interlock?

A

The Flow Control Valves

48
Q

What is the effect of RPV Level 3(178 inches) on the Reactor Recirculation Pumps?

A

The Reactor Recirculation Pumps, if they are running in fast speed, will downshift to slow and a fast speed start or shift to fast is prevented. A trip signal is sent to the 5 breakers if this condition is present.

49
Q

What is the primary purpose for the RPV Level 3 Reactor Recirculation downshift?

A

The primary purpose for the downshift is to increase level in the Downcomer by decreasing flow.

50
Q

What is the secondary purpose for the RPV Level 3 Reactor Recirculation downshift?

A

The secondary purpose is to prevent Jet Pump cavitation, and reduce the velocity effects on Wide Range Level instruments.

51
Q

What is the purpose of the End of Cycle Recirculation Pump Trip Interlock?

A

Downshifting Reactor Recirculation Pumps at the end of cycle helps to counteract the positive reactivity added by a turbine trip. The concern is that negative reactivity is not added fast enough by the initial control rod insertion on the turbine trip.

52
Q

What conditions will produce an EOC/RPT signal?

A

Power >38 % with a Turbine Control Valve or Turbine Stop Valve fast closure(Turbine Trip).

53
Q

How does the End of Cycle Recirculation Pump Trip affect Reactor Recirculation Pump operation?

A

The Reactor Recirculation 3 and 4 breakers receive a trip signal. The 5 breaker will trip based on the trip of the 3&4 breakers.

54
Q

What value of Turbine First Stage Pressure is equivalent to 38 % power?

A

212 psig First Stage Pressure

55
Q

How does an RPV level 2 RRCS signal affect Reactor Recirculation Pump operation?

A

The RPV level 2 signal will send a trip signal to the 1, 2, 3, and 4 breakers. The 5 breaker will trip based on the position of the 3 & 4 breakers(B33 logic).

56
Q

What is the purpose of the RRCS RPV Level 2 pump trip?

A

The RPV Level 2 trip is based on adding negative reactivity during an ATWS by voiding the core.

57
Q

How does an RPV Pressure 1083 PSIG RRCS signal affect Reactor Recirculation Pump operation?

A

The RPV Pressure 1083 PSIG signal will send a trip signal to the 3 and 4 breakers, and initiate a downshift to slow speed.

58
Q

What is the purpose of the RPV Pressure 1083 PSIG RRCS signal?

A

The RPV Pressure 1083 PSIG Recirculation Pump downshift is based on adding negative reactivity during an ATWS by voiding the core.

59
Q

How does an RPV Pressure 1083 PSIG RRCS signal affect Reactor Recirculation Pump operation if the APRMs indicate above downscale after 25 seconds?

A

The 1083 PSIG signal(locks in) combined with APRMs not downscale in 25 seconds will send a trip signal to the 1, 2, 3, and 4 breakers. The 5 breaker will trip based on the position of the 3 & 4 breakers(B33 logic).

60
Q

What is the purpose of the Thermal Shock Interlocks?

A

The Thermal Shock Interlocks protect the Reactor Vessel and the Recirculation System from thermal stress.

61
Q

What is the affect of the Thermal Shock Interlocks on Reactor Recirculation Pump operation?

A

The Thermal Shock Interlocks will prevent starting a Reactor Recirculation Pump in slow or fast, BUT will not cause a trip or a downshift.

62
Q

What are the Thermal Shock Interlocks?

A

The following differential temperatures must be satisfied:

1) <100 F differential temperature between the Steam Dome and the Bottom Head.
2) <50 F differential temperature between the Steam Dome and the Recirculation Pump suction.
3) <50 F differential temperature between the Recirculation Pump suctions.

63
Q

What are the seven common start permissives for the Reactor Recirculation Pumps?

A

1) Suction Valve greater than 90 % open.
2) Discharge Valve greater than 90 % open.
3) Flow Control Valve at minimum(8-10% open)
4) Flow Control Valve in MANUAL
5) Thermal Shock Interlocks met
6) 5A and 5B racked in with power available
7) No incomplete start sequence timer timed out

64
Q

How does not meeting a common start permissive affect Reactor Recirculation Pump operation?

A

Losing the suction/discharge valve and incomplete start sequence timer permissives will cause a trip of the 1 and 5 breakers.

The Thermal Shock Interlock will prevent a start in fast or slow, but does not cause a trip if running.

65
Q

What is the Reactor Recirculation Pump Slow Start Sequence?

A

1) Seven common start permissives met, and the the 5 breaker control switch is taken to START.
2) Feedwater flow less than 3.43 Mlbm/hr
3) Low Power Bypass Switch in NORMAL
4) LFMG is available(1 breaker closes)
5) Auto transfer relays will be energized
6) Pump will start with Fast Speed breakers to overcome breakaway torque.
7) When pump speed reaches 95 % the 5 breaker opens.
8) When the pump coasts down to 25 % speed the 2 breaker closes.

66
Q

What are the permissives required to shift Reactor Recirculation Pumps to fast speed?

A

F - Feed flow >3.43 Mlbm/hr
E - EOC/RPT signal or RRCS level 2 signal not present
C - Cavitation Interlocks satisfied
A - Auto Transfer sequence not energized(slow start or downshift)
L - Level is greater than level 3

67
Q

What will cause a Reactor Recirculation Pump to trip from fast speed?

A

1) 5 breaker pushbutton
2) RRCS Level 2 signal
3) Motor overcurrent/lock out
4) Suction or discharge valve not >90 % open
5) Auto transfer incomplete
6) Loss of LFMG during a transfer
7) 3 or 4 breakers open

68
Q

What will cause a Reactor Recirculation Pump to downshift from fast to slow speed?

A

1) Less than 3.43 Mlbm/hr for 15 seconds
2) Differential temperature between the Steam Dome and Pump Suction less than 10 F for 15 seconds
3) EOC/RPT with Reactor Power greater than 38 %.
4) Both 5 breaker switches taken to XFER simultaneously
5) 1083 psig RRCS signal
6) RPV level 3(178 inches)

69
Q

What will cause a Reactor Recirculation Pump to trip from slow speed?

A

1) Breaker 2 trip pushbutton
2) RRCS 1083 psig and APRMs are not downscale after 25 seconds
3) RRCS level 2(130 inches)
4) Suction or discharge valve not greater than 90 % open
5) Auto speed transfer sequence incomplete
6) Breaker 1 open/trips
7) LFMG lockout on motor or generator
8) Loss of LFMG excitation
9) Loss of logic power during a transfer

70
Q

What does the Incomplete Start Sequence Relay Circuit look at to determine if a sequence is successful?

A

The Incomplete Start Sequence is a 40 second timer that will time out if a start or shift sequence is unsuccessful and trip the 1 and 5 breakers. The logic starts when the sequence(start or shift) is initiated and looks at speed, either 95 % or approximately 25 %, to determine success.

71
Q

What is the purpose of the Automatic Flow Demand Limiter?

A

The Automatic Flow Demand Limiter allows core flow to be raised above 100 % while preventing APRM power from exceeding 100 %.

72
Q

Where does the AFDL signal input into the Flow Controller logic?

A

AFDL inputs downstream of the flow controller so nothing will override the AFDL input signal.

73
Q

What is the maximum amount of valve travel that AFDL can demand?

A

40 % flow demand signal which equates to approximately 45 % valve position ex if valves are 100 % open they will close all the way to approximately 55 % if required to lower power below the AFDL setting.

74
Q

What provides the flux signal for AFDL?

A

The flux signal to AFDL is provided by either APRM A or E based on their availability. APRM A is the normal source, and when APRM A is bypassed it will automatically shift to APRM E.

75
Q

What signals will cause a Reactor Recirculation Flow Control Valve Runback?

A

1) A RFPT trips coincident with RPV level 4(197 inches)

                               OR

2) Main Condenser Vacuum degrades to 5.6 “ and the Number 1 Bypass Valve is FULL OPEN …..OR…..Less than 3 Circulating Water Pumps are running.

76
Q

How does a Flow Control Valve Runback affect the Reactor Recirculation system?

A

The Flow Control Valves will close to 17 % valve position or approximately 48% Drive Flow (approximately 65% power).

B33 (2 decks)

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