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M13 > General > Flashcards

General Flashcards

1
Q

What is the purpose of the Drywall Cooling System?

A

Provide cooling to the Drywell including:

1) Reactor Vessel Skirt Flange.
2) Refueling Bellows Support Skirt.
3) Annulus Space between the Vessel and the Biological Shield Wall.

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2
Q

How many Drywell Air Handling Units are there, and where are they located?

A

There are 3 Drywell Air Handling Units.

Lower AHU - Drywell 590 foot level.
Middle and Upper AHU - Drywell 637 foot level.

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3
Q

How many Drywell Cooling Fans are there?

A

There are a total of six Drywell Cooling Fans. There are two fans per Air Handling Unit with one normally running and the other in standby.

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4
Q

What are the sections of the Drywell Cooling AHUs?

A

The Drywell Air Handling Unit first stage is a Roughing Filter, followed by two air coolers in series.

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5
Q

Does the Roughing Filter stay installed during normal power operation?

A

NO, the Roughing Filter is removed to prevent it from ending up in the Suppression Pool during a LOCA.

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6
Q

How many cooling coils are in service at a time?

A

Only one cooling coil is allowed to be in service at a time due to an interlock.

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7
Q

What system provides the cooling water for the Drywell Air Handling Units?

A

Nuclear Closed Cooling(P43).

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8
Q

What determines which cooling coil is in service to each Drywell Air Handling Unit?

A

An air operated three-way valve, controlled by a switch on 1H13-P800, determines which cooling coil is in service.

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9
Q

What system provides air to the three-way AOV that decides which cooling coil is in service?

A

Instrument Air(P52).

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10
Q

How does cooling flow fail for the Drywell Air Handling Units?

A

Cooling water flow will fail to the B cooling coil service.

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11
Q

How do the Drywell Air Handling Units interact with the Leak Detection System?

A

The Upper and Middle Drywell Air Handling Units drain flows are monitored by Leak Detection to determine if there is a steam leak in the Drywell.

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12
Q

What are the power supplies to the Drywell Cooling Fans?

A

F1B08, F1C08, and F1D08.

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13
Q

What is the normal lineup for the Drywell Cooling Fans?

A

One fan running per AHU on each level with the other fan in standby.

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14
Q

What will cause an automatic start of the standby Drywell Cooling Fan?

A

The standby Drywell Cooling Fan will automatically start on low flow(D/P) with the standby fan’s switch in STBY.

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15
Q

Following a start of the standby Drywell Cooling Fan on low flow what will be the result of the running fan’s low flow condition clearing?

A

The standby Drywell Cooling Fan will shutdown following a reset of the the low flow condition.

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16
Q

What will happen to the normally running fan if a low flow condition locks in?

A

The fan will continue to run until it’s shutdown by the operator. There is no low flow trip.

17
Q

Where is the vibration monitoring located for the Drywell Cooling Fans?

A

There is an alarm in the Control Room, but the actual vibration meters are located at IB-620.

18
Q

How does the Nuclear Closed Cooling Supply Valve Control Switch determine which cooling coil is in service?

A

The switch, if placed in the A coil position, energizes a solenoid allowing Instrument Air to align a 3-way valve. This will direct flow to the A cooling coil. By placing the switch in B coil position, the solenoid is de-energized, allowing flow to be directed to the B cooling coil.

19
Q

What is the difference between the cooling water flow through the Lower Drywell AHU cooling coils, and the cooling coils of the other two AHUs?

A

The flow through the cooling coils of the Upper and Middle AHUs is full flow. The Lower AHU cooling flow is throttled.

20
Q

How is cooling water flow controlled through the Lower Drywell AHU?

A

The cooling water flow to the Lower Drywell AHU is through one coil, but a motor operated throttle valve is used in conjunction to help control temperature. The MOV acts as a bypass valve to allow flow to the bypass the cooling coil to control temperature.

21
Q

What is the power supply for the Lower Drywell AHU NCC Throttle Valve?

A

K-1-N, non-safety and non-diesel-backed.

22
Q

How will the Lower Drywell AHU NCC Throttle Valve fail on a loss of power?

A

The NCC Throttle Valve will fail “AS-IS”.

M13 (2 decks)

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