WC (Normal Chilled Water)

Question 1

Unit 1 experiences an inadvertent ‘A’ Train SIAS
The reactor trips due to a loss of the grid
All systems operate as expected
Following Standard Post Trip Actions the CRS directs you to restore Containment normal cooling due to rising Containment temperature. Which of the following describes the availability of Normal Chilled Water?

A. The ‘A’ Normal Chiller is available by going to the start position on WCA-HS-1A
B. The ‘A’ Normal Chiller is available by going to the stop position then start position on WCA-HS-1A
C. No Normal Chillers are available.
D. The ‘A’ Normal Chiller can be started locally

Answer 1

C. No Normal Chillers are available

Note: SIAS load sheds the ‘A’ Chiller

Question 2

Which of the following describes the effect of a Loss of Instrument Air on the Normal Chilled Water System?

A. WC is isolated to the containment
B. All Normal Chillers will trip on Condenser low water flow
C. WC is isolated to the Charing Pump room coolers
D. WC is isolated to the Control Room ACU

Answer 2

D. WC is isolated to the Control Room Normal ACU

Question 3

Which of the following cooling water systems can receive make-up water from the Condensate Transfer System?

A. WC
B. EC
C. TC
D. NC

Answer 3

B. EC

Question 4

Of the Normal Chiller trips, which ONE prevents an over pressure condition in the Condenser?

A. Cooler low water flow
B. Condenser low water flow
C. Cooler low water temperature
D. High Condenser pressure

Answer 4

B. Condenser low water flow

Question 5

If the chilled water supply temperature decreases to ____ to operating chiller compressor will trip (low load recycle). The compressor will automatically restart in approximately ____ after the temperature increases back up to 45 F.

A. 40 F, 5 minutes
B. 38 F, 10 minutes
C. 38 F, 15 minutes
D. 32 F, 15 minutes

Answer 5

C. 38 F, 15 minutes

Question 6

During low load conditions, centrifugal compressors exhibit a ‘surging’ characteristic if suction volume flow is reduced below a certain value. If allowed to operate in this manner, the compressor cannot create enough pressure to force the gas into the condenser.
Which of the following components is designed to prevent ‘surging’?

A. Flash Economizer
B. Hot Gas Bypass
C. Refrigerant Head Pressure Control Valve
D. Pump Down Unit

Answer 6

B. Hot Gas Bypass

Question 7

The Containment Normal ACUs , HCN-A01A thru D are cooled by ____ and will be isolated by a ____

A. (1) Normal Chilled Water (2) CIAS
B. (1) Normal Chilled Water (2) CSAS
C. (1) Nuclear Cooling Water (2) CIAS
D. (1) Nuclear Cooling Water (2) CSAS

Answer 7

A. (1) Normal Chilled Water (2) CIAS