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Hatch ILT-14 Turbine Systems Block > Systems Block 6 Previous System Review Questions > Flashcards

Systems Block 6 Previous System Review Questions Flashcards

1
Q

What are the power supplies for the CRD pumps?

A

A- 4160 E
Control power from R25-S004
B - 4160 F
Control power from R25-SOO6

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2
Q

What are the trips for the CRD system?

A 
SOULLL MAN
- Suction Pressure Low
U2 - 12" Hg
U1 - A - 9.3" Hg, B - 10.8" Hg
- Overcurrent
- Undervoltage
- Load Shed
- Loss of DC control power (B pump only)
- LOCA signal (restart with LOCA reset PB)
- Manual
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3
Q

At what levels in the Scram Discharge volume do protective actions take place?

A

135, 567

1.5 gal (3 gal) - SDV Not drained alarm
36.2 gal (18 gal) - Rod out block (silent)
57 gal (63 gal) - SCRAM

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4
Q

What happens to the CRD system on a Rx scram? What if there is a LOCA signal present as well?

A

C11-F002 will go closed (5gpm still), since the system see high flow to the accumulators

If the scram was due to a LOCA signal, the CRD pumps will trip, the system will see low flow, and C11-F002 will go full open

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5
Q

What are the major power supplies associated with the RMCS and what do they provide power to?

A

Vital AC

  • 4 rod display
  • RPIS
  • Full in (Green)
  • Full out (Red)

R25-S101(S125)/S102(S116)

  • Blue SCRAM lights
  • Amber accumulator trouble lights

Instrument Bus A (R25-S064)

  • Drift light
  • Select light (white)
  • Rod move control switches (RONOR and normal)
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6
Q

What happens on a master timer failure during the withdrawal portion of the signal in the RMCS system?
What about during the insert signal?

A

Failure during the withdrawal portion of the signal, the backup timer will sense the failure and take over. This will prevent the rod from notching out more than once notch. Backup timer does the following at 2 seconds:

  • De-selects all rods
  • Select block generated

Failure on an insert signal, backup timer does nothing. Rod will continue to drive all the way in.

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7
Q

Which directional control valves allow for rod withdrawal/rod insertion?

A

Odds in/Evens out
F121 and F123 - Insert
F120 and F122 - Withdrawal

There is a brief insert signal prior to every withdrawal to unlatch the six collet fingers and to allow for withdrawal.

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8
Q

When is the Rod Worth Minimizer required?

A

T.S. required when <10% Reactor Power based on 280 cal/gm fuel enthalpy following a control rod drop accident

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9
Q

What are the LPSP and LPAP setpoints associated with the RWM?

A

LPSP - 21% (20.6%)

LPAP - 26% (25.6%)

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10
Q

What does Shutdown “YES” and All Rods In “YES” mean on the RWM?

A

Shutdown = Yes means all rods are at least the 02 position

All rods in = yes means all rods are at position 00. If not, will provide a list of which rods are not

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11
Q

Which arrangements of APRMs feed into the RWM?

A

A
B or C
D

A and D both must be above LPSP, along with B or C

Both B and C would have to be below the LPSP to cause the RWM to start enforcing

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12
Q

What is the power supply to APRMs?

A

Each channel is powered from both RPS A and B. Recorders on P603 are powered from Vital AC

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13
Q

What is the equation for the STP high trip and rod block signals associated with APRMS? What are the clamped values?

A

STP High trip:
0.57W +53% - 0.57deltaW
clamped at 112.5%

STP High block:
0.63W + 41% - 0.63deltaW
clamped at 110%

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14
Q

What will cause an INOP trip signal to be generated in an APRM?

A

SOO MU HVL

Switch out of operated
Module Unplugged
High Volts Low

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15
Q

Which APRM voters are associated with each side of RPS? What happens to the voters on a loss of RPS?

A

RPS A - Voters A and C
RPS B - Voters B and D

Loss of a side of RPS = half scram on that side. Loss of a single voter also causes a half scram signal on that associated side of RPS

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16
Q

What causes the station service 4160 buses to fast transfer after a main turbine trip?

A

Station service 4160s will fast transfer once BOTH PCBs for the associated generator have opened.

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17
Q

Can station service buses be manually transferred if a EDG is in test? What other switch must be manipulated to transfer buses?

A

“Test NO Manual”
With any EDG is TEST, station service buses cannot be manually fast transferred. Auto fast transfer will still happen once PCBs open

UAT and SAT supply breakers cannot be closed at the same time unless the interlock defeater switch is taken to OFF

18
Q

What allows for the 4160 emergency buses to fast transfer?

A

Fast transfer from Normal to ALT occurs on undervoltage of the bus IF:

  • DG output breaker is NOT closed
  • Associated DG is not in TEST
  • Undervoltage does not cause the 86 lockout relay to roll
19
Q

What will take an EDG out of TEST?

A
  • LOCA signal

- LOSP - De-energizes alternate SAT

20
Q

What are the trips associated with the EDGs in Test and out of Test?

A

Anytime : SOLD
Start failure: <250rpm and <6 psig oil pressure w/in 7s
Overspeed: 1000 +/- 10 rpm
Low lube oil pressure : 21psig (18) 20s after start
Differential lockout

Test: PORCH
Pushbutton - local and remote, when no auto start signal present and breaker not closed
Oil temp high - 230F
Reverse Current
Crankcase high pressure : 0.5” H20
High Jacket temp or low press: 205F or 9psig (10) 20s after start

21
Q

What is the load sequence for the first 22 seconds after an EDG starts and ties to a bus?

A 
12s for EDG to come up to rated voltage and speed and for the breaker to close
After breaker closes:
0s - CS A and B start
0.5s - LPCI C starts
12s - LPCI A,B,D start
22s - PSW A and B start
22
Q

What happens on a loss of R22-S016 (125/250 VDC bus A)?

A
  • PCBs dont open automatically
  • RCIC Inop
  • RFPs wont trip, have to trip locally
  • 4160 station service buses wont fast transfer
  • No Main turbine runback of vibration trips
  • 4160 emergency buses will not fast transfer

If shown a picture of the lights on the control panel, top row of lights = R22-S017, bottom 3 rows belong to R22-S016

23
Q

What happens on a loss of R22-S017 (125/250 VDC bus B)?

A
  • HPCI Inop
  • Recirc pumps will not trip (S/D manually)
  • 4160 station service buses will not fast transfer

If shown a picture of the lights on the control panel, top row of lights = R22-S017, bottom 3 rows belong to R22-S016

24
Q

What happens on a loss of R25-S004/S005/S006?

A

Associated EDG will not auto start, associated 4160 emergency bus will not fast transfer

25
Q

What are the power supplies for the fire water pumps?

A

Jockey pump - 600 1A

Electric fire pump - 4160 1E

26
Q

When do the pumps in the fire water system start/stop?

A 
Jockey pump stops - 157 psig
Jockey pump starts - 125 psig
Electric fire pump starts - <110 psig
Diesel fire pump #1 starts - <100 psig
Diesel fire pump #2 starts - <90 psig
27
Q

What rooms does the 13 ton cardox system provide CO2 to, and is it single shot/double shot? Is it automatically or manually initiated?

A

13 ton CARDOX

  • Cable spreading Room
  • Computer Rooms

Double shot capacity
Manual initiation only

28
Q

What rooms does the 5 ton cardox system provide CO2 to, and is it single shot/double shot? Is it automatically or manually initiated?

A

5 ton CARDOX
- EDG building

Single shot capacity
Auto initiation in oil/fuel containing rooms (EDG room, Day tank room).
Has a hose reel in switchgear room (actuated by pulling off the wall)

29
Q

What is the ARI setpoint?

A

Rx pressure - 1170 psig
Rx water level - -35”

requires both channel of either to energize

30
Q

What is the power supply to SBLC pumps and squib valves?

A

A pump and squib valve - R25-S011
B pump and squib valve - R25-S012

Loss of either S011 or S012 will prevent associated pump from running and squib valve from firing.

31
Q

For the SBLC system, which air systems provide air to which components?

A

For the tank to provide agitation/mixing, station service air is the supply.

For the tank level instrumentation, NIEIA provides the air supply

32
Q

When SBLC is actuated in the MCR, which other system will be affected?

A

RWCU G31-F004 closes, to prevent RWCU from removing the boron

33
Q

What are the SCRAM signals associated with RPS?

A
  • SDV high level - 57 gal (63)
  • MSIVs <90% open - any 3 lines, (means and extremes)
  • DW press high - 1.85 psig
  • RPV press high - 1074 psig
  • RWL low - +3”
  • Turbine trip/load reject
    >27.6% (129 psig first stage pressure)
    TCV closure <670 psig EHC - and 1 = half scram
    TSV closure <90% open (same logic as MSIVs)
  • Neutron monitoring
  • APRM S/U - 13%
  • APRM fixed - 117%
  • APRM STP High - 0.57W +53%
  • OPRM trip (above 25% and <60% flow)
  • IRM 115/125
  • IRM INOP
  • SRM 3x10^5
34
Q

When do the RPS emergency power monitoring breakers trip?

A

Over-voltage - 129 VAC
Undervoltage - 111.5 VAC
Under frequency - 57.2 hertz

35
Q

When transferring an RPS bus to the alternate power supply, what is the danger associated with doing so?

A

Since the switch is a break before make, will cause a loss of the associated RPS bus. This will lead to a half scram on that side of RPS. If already have a have scram on one side, operating the switch in the wrong direction can lead to a full scram.

36
Q

What are the power supplies and trips associated with the RWCU system?

A

Unit 2: A - 600AA, B - 600AA
Unit 1: A - 600AA, B R24-S015 from 600AA

Canned pumps 2B (1A)

Trips:
High cooling water temp - 140F (2A/B, 1B)
High motor temp - 140F (1A)
Low flow - <60 gpm 15s time delay (30s for 2B)
Either F001 or F004 not full open

37
Q

What are the isolation signals for the RWCU system?

A 
Both F001 and F004
- Low RWL  -  -35"
- Hi delta flow - 56 gpm for >42,5s
- High RWCU area vent deltaT
60F for pump room
60F (45F) for HX room
60F (40F) for CUPS room
- High RWCU ambient temps
140F Pump room, HX room and CUPS room

F004 ONLY

  • SBLC actuation
  • High NRHX outlet - 140F
38
Q

What cause the G31-F033 valve to isolate in the RWCU system? What type of valve is it?

A

Air operated valve
Isolated on:
High pressure downstream - 140psig (prevents over pressurizing the main condenser)
Low pressure upstream - 5 psig (prevents drawing a suction in the piping)

140 up, 5 down

39
Q

What is the power supply for the fuel pool cooling pumps? What are the trips associated with them?

A

R24-S015

Trips:
Low suction pressure - 8psig (3psig)
High discharge pressure - 100psig (140psig)

3 8 100 140 (means and extremes) means = Unit 2, extremes = Unit 1

40
Q

What is the normal level and T.S. required level in the spent fuel pool?

A

Normal 22’4” to 22’7”

T.S required level is 21’ above irradiated fuel bundles

41
Q

Which gate seals receive their air supply from which unit in the fuel transfer canal? What about a backup supply?

A

Outer gate seals - Unit 2
Inner gate seals - Unit 1
Transition canal transition piece - Unit 2
Transition joint piece - Unit 1

Backup supply with Nitrogen, call I&C to install bottles staged on refuel floor

Hatch ILT-14 Turbine Systems Block (12 decks)

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