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Systems > Main Steam > Flashcards

Main Steam Flashcards

1
Q

How many main steam safety valves?
What are their setpoints?

A

5 per steam generator
1175#, 1190#, 1205#, 1220#, 1235#

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2
Q

MS system purpose

A
  1. Contain and transport steam to the turbines for electrical production
  2. Provides for a means for removing heat from the steam generators when the turbine is not available through the use of steam dumps and atmospheric reliefs.
  3. Directs steam for use by:
    a. HP turbines
    b. MSRs 2
    c. Main condenser air ejectors 2
    d. TD MFWPs
    e. Steam dumps 12
    f. Gland sealing steam
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3
Q

Loads supplied by main steam:

A

a. HP turbines
b. MSRs 2
c. Main condenser air ejectors 2
d. TD MFWPs
e. Steam dumps 12
f. Gland sealing steam

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4
Q

Main steam actuation signals (5)

A
  1. Hi Hi Containment pressure=8.2 psig 2/3
  2. Low steamline pressure = 640 psig rate sensitive 2/3 on 1/4
  3. High steamline pressure rate (below P-11 and steamline pressure SI blocked) 100 psig/50 sec 2/3 on 1/4
  4. Manual main steam isolation 1/1 at 1/2 locations
  5. Individual MSIV control switches
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5
Q

Manually actuating main steam actuation does/does not close the MSIV bypass valves.

A

Does not

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6
Q

Governor valve opening sequence

A

1, 2, and 3 open at the same time and then GV 4 opens.

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7
Q

Which pressure transmitter provides input for SG porv operation? What is the normal lifting setpoint?

A

PT-041 and controls 1115-1175#

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8
Q

Safeties have a capacity of _____% per valve and atmospheric PORVs have a capacity of _____% per valve.

A

5.6%(5.65%) unit 1 (2) 112%/113%
3.3%(2.6%) Unit 1 (2) 13.2/10.4

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9
Q

0-100% steam pressures for both units

A

unit 1 1092-1006 psig
unit 2 1092-887 psig

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10
Q

MSIVs are controlled from MCB to ______ and RSDP to ____.

A

O, C, Test
O, C

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11
Q

MSIVs will normally open in _____, normally close in _____, emergency close in _____ and partial stroke is based on____.

A

5 minutes
5 seconds
2.5 seconds
Needle valve positions

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12
Q

MSIV bypass valve requires ____ to open and fails ____.

A

Air
closed

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13
Q

MSIV solenoid power supplies. A and D active _____ Standby ____. B and C active _____ Standby ______.

A

DC 111 / DC 112
DC 112/ DC 111

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14
Q

A level control malfunction in the main steam flash tank has the potential to _________.

A

Draw air into the condenser

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15
Q

Throttle valves control turbine speed from _____ and governor valves control speed beyond_____.

A

0-1700 RPM
>=1700 RPM

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16
Q

Each MSR is protected by 3 relief valves with setpoints _____.

A

250, 256, 265 psig

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17
Q

3 Steam line PTs per steam generator that input to: (10 items)
PT514, 515, 516

A
  1. Indication on MCB
  2. Indication at RSDP
  3. Low pressure alarm
  4. Recorder on PM04J
  5. Computer
  6. SI and RPS
  7. Density compensation
  8. SG WHPS (U2)
  9. Steam dump steam pressure mode (PT516 only)
  10. MS/FW header DP meter PI509
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18
Q

FT512 and FT513 steamline flow transmitters provide input to: (5 items)

A
  1. Indication on MCB
  2. Steam flow mismatch alarm
  3. Recorder on PM04J
  4. Computer input
  5. Input to SGWLC and FW pp speed
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19
Q

PT 505 and 506 are the impulse pressure instruments and provide input to: (5 items)

A
  1. P-13 turbine at power
  2. C-20 AMS
  3. Computer (P0398)
  4. MCB indication
  5. Impulse pressure validation circuitry
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20
Q

C-7 is the loss of turbine load interlock. What are the inputs and purpose?

A

10% drop in 120 seconds
Used PT505, 506 and the median of MS002A/B/C from DEHC
If 2/3 circuits sense the pressure drop, then it activates C-7 and arms the steam dumps.

21
Q

MS flash tank has ______ indication and alarms ______.

A

Local level indication only
Hi/Lo alarms in MCR

22
Q

A and D PORVs are Division ___ power and B and C _____.

A

Division 11
Division 12

23
Q

RSDP has the following SG PORV controls:

A

Local/remote switch
Close/Auto switch
M/A station

24
Q

Taking the SG PORV control switch to CLOSE does the following:

A

Aligns the accumulator to rapidly close or maintain close by maintaining accumulator pressure.

25
Q

DC powered lights for SG PORV indication receive valve position from _______.

A

Micro switches

26
Q

IF the control switch taken to close and SG PORV fast closes, it will take ______ before recharge is complete and can be reopened.

A

2-4 minutes

27
Q

Do not ____ a PORV if power still supplied to the SG PORV.

A

Hand pump

28
Q

PT507 is the main steam header pressure instrument and supplies the following:

A
  1. Steam dumps, steam pressure mode
  2. MCB indication
29
Q

What will cause a SG PORV to “fast close”?

A

Loss of valve control power or going to CLOSE on the CLOSE/AUTO switch on the MCB/RSP.

30
Q

Impulse pressure validation circuit feeds the following components : (5)

A
  1. Rod control
    a. PWR mismatch
    b. Tref
    c. C-5
  2. Steam dumps
    a. Tref
    b. C-7
  3. HD tank level control
  4. MCB recorder
  5. C-16
31
Q

Steam line SI can only be blocked ______ and is ____ reset once ______.

A

=P-11

32
Q

What components in main steam use IA?

A

motive force for several component operations and controls, i.e. MSIV hydraulic pump, MSIV Bypass Valve control, MS Drip Leg Drain Valve controls, MS Flash Tank level control, and Steam Dumps.

33
Q

Which train(s) of actuation do/does individual MSIV control switches use?

A

Only the active train signal

34
Q

LCO 3.7.1 ____ MSSVs must be operable per SG in modes _____. If any inoperable, reduced power per table.
___________

A

5
Modes 1-3
4 <= 56
3 <= 39
2 <= 23

35
Q

LCO 3.7.2 _____ MSIV and their _____ must be operable in Modes ______.

A

4 and their actuator trains
Modes 1-3 except when all MSIVs closed

36
Q

LCO 3.7.3 Secondary specific activity must be ______ uci/gm.
If not, Mode ____ in ____ hours and Mode ____ in ____ hours.
Modes 1-4

A

<=0.1
3 in 6 hours
5 in 36 hours

37
Q

LCO 3.7.4 SG PORVs

A

Four SG PORV lines shall be OPERABLE.
Modes 1-3
30 days to restore one
24 hours to restore with two out

38
Q

MSSVs must have sufficient capacity to limit secondary pressure to <____% design. Setpoints are staggered to reduce ______ with insufficient steam pressure after turbine and reactor trip.

A

110%
Valve chattering

39
Q

______ SG PORVs are powered from an uninterruptible power supply system with battery backup to ensure that a passive
electrical failure does not render two SG PORVs on the
intact SGs inoperable.

A

C and D

40
Q

A closed block valve (does/does not) render it or its SG PORV line inoperable.

A

Does not

41
Q

When the test switch for each manual isolation of MSIVs is not in normal, this switch is _______.

A

not operational and the TLCO not met

42
Q

PTMS002A/B/C measure first stage impulse pressure and feed the following: (3)

A
  1. DEHC impulse pressure feedback loop (median)
  2. Local indication
  3. Impulse pressure validation circuitry (median)
43
Q

There are ___ spool valves and they are ____.
There are ____ solenoids for each MSIV and they are ____.

A

2; M and N
4; A, B, C, D

44
Q

Which solenoid(s) responsible for opening operation of MSIV?

A

B and C, B shifts M spool valve right and C energizes to remove air from the N spool valve to move to center.

45
Q

Which solenoid(s) responsible for closing operation of MSIV?

A

A, Shifts M spool valve to the left, closes valve with hydraulics

46
Q

The MSIV’s should not be opened if the MSIV Valve Room temperature is
_____

A

> 120F

47
Q

If the MSIV Handswitch is left in the ____ position, the hydraulic pump
will continue to stroke, in order to maintain pressure on the actuator,
placing unneeded wear on the hydraulic pump. The switch should be
returned to the ____position when the MSIV is ______.

A

Close
Auto
Closed

48
Q

It is preferred to NOT leave the C/S for the S/G PORVs in ____. This
down powers the electronics and will usually result in controller drift if left
OFF too long. Instead, leave the C/S in _____with 0% demand or if
necessary, isolate the flowpath with the ______.

A

Close
Auto
1MS019 valves

Systems (80 decks)

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