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Main Steam > Main Steam > Flashcards

Main Steam Flashcards

1
Q

What does the main steam system provide steam to?

A
  • Turbine
  • MSR
  • FW pump turbines
  • Gland seal system
  • AFA
  • Aux Steam system
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2
Q

What are the SG downcomer upstream block valves used for?

A

Allow remote isolation of downcomer control valves

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3
Q

How do the SG downcomer control valves fail on a loss of air or power?

A

Locked as-is

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4
Q

Where are the SG downcomer control valves located?

A

120’ turbine building

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5
Q

What are the SG downcomer control valve bypass valve used for?

A

Used during mode 3 to control SGWL with water supplied by Aux feed novermber

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6
Q

Where are the SG downcomer isolation valves located?

A

100’ MSSS

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7
Q

What do the downcomer isolation valves do on a MSIS?

A

Fail closed

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8
Q

How long can the downcomer isolation valves operate on backup N2 pressure?

A

8 hours

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9
Q

Where are the economizer control valves?

A

120’ turbine building mezzanine area

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10
Q

How do the economizer control valves fail?

A

as-is

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11
Q

How much pressure is available to ‘fast close’ the economizer isolation valve?

A

5000 psig

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12
Q

Where are the economizer isolation valves located?

A

120’ MSSS

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13
Q

How many tubes are in the SG and how many can be plugged?

A

12580 tubes and 10% can be plugged

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14
Q

Where is the economizer?

A

just above the tube sheet on the cold leg side of the SG

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15
Q

What does the economizer do?

A

increases SG efficiency

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16
Q

What does the wrapper plate do?

A

divides SG downcomer and evaporator sections

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17
Q

How many main steam safety valves are on each main steam supply line?

A

Five

18
Q

Where are the MSIV’s located?

A

140’ MSSS

19
Q

What are the setpoints of the main steam safety valves?

A

1250, 1290, and 3 of them are 1315 psig

20
Q

On a loss of IA, what happens to the ADV’s?

A

Have 16 hours of N2 backup

21
Q

What is the purpose of the MSIV bypass valve?

A

allow warmup of piping downstream of the MSIVs, pressure equalization across the MSIV’s to allow opening, or to allow operation of the A MFP after an MSIS

22
Q

Where are the steam bypass control valves?

A

140’ Turbine Building

23
Q

Where are the wet layup recirc pumps?

A

80’ containment

24
Q

How are the wet layup recirc pumps controlled?

A

The local switch must be placed in start; then you can control them from their respective MCC’s

25
Q

On startup where does the flow go through the SG?

A

100% of all flow passes through the downcomer control valves to supply sufficient preheating for incoming feedwater at lower power

26
Q

On startup, when do the downcomer control valves begin to close and the economizer control valves begin to open?

A

Around 15% power

27
Q

What happens to the downcomer control valves around 50% power?

A

They begin to open back up to about 10%. Between 50-100% power; 10% of the feed is through the downcomer.

28
Q

What is on the tube and shell side of the SG?

A

Tube- RCS (primary coolant)

Shell- secondary coolant

29
Q

When do the blowdown isolation valves isolate?

A

SAM

  • SIAS
  • AFAS
  • MSIS
30
Q

What is the minimum SG water level? Why?

A

30% narrow range. To prevent uncovering the SG tubes

31
Q

What is the max allowable temperature at the outlet of the blowdown hx?

A

140 degrees F

32
Q

What is the max allowable pressure at the BFT?

A

230 psig

33
Q

What is the max allowable level in the BFT?

A

100 inches

34
Q

What is the concern with the FWP’s when we are doing high rate blowdown?

A

Feedwater flow demand and resultant pressure will increase in FWPT speed which will cause FWP suction pressure to decrease.

35
Q

How many tubes are in a Steam Generator? What percentage can be plugged without affecting secondary pressure?

A

12,580 tubes

10% can be plugged

36
Q

What does the economizer section of the SG do for us?

A

Increases SG efficiency by preheating the incoming FW before it enters the evaporator section

37
Q

What does the tube sheet and u-tubes do for us?

A

Provides the boundary between the secondary and primary.

38
Q

What does the steam outlet orfices do?

A

limit steam flow in the event of a main steam line break

39
Q

What are the utubes in the SG made of?

A

Inconel 690

40
Q

When do we get a MSIS signal?

A

960 psia in the SG or 3 psig in containment

Main Steam (1 decks)

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