Control Oil

Question 1

What does the Control Oil system do?

Answer 1

Provide control oil for;

• MS Control Valves
• MS Stop Valves
• CIV’s
• Electro hydraulic control System

Question 2

Describe the hydraulic fluid pumps?

Answer 2

• NGN
• 1600 psig normal
• 1 normally running, 1 in standby

Question 3

When does the standby hydraulic pump come on?

Answer 3

1300 psig

Question 4

When will the MT trip on low CO pressure?

Answer 4

1100 psig (2 out of 3 logic)

Question 5

What provides cooling for the CO system?

Answer 5

TCW

Question 6

If IA is lost what is the effect on the CO system?

Answer 6

The TCW temperature control valve will fail open. An AO will have to throttle the bypass valve and close the temperature control valve.

Question 7

When will the CR get Hi and Lo temperature alarm in regards to the CO system?

Answer 7

Hi- 135 degrees F

Lo- 85 degrees F

Question 8

Explain the control oil accumulators?

Answer 8

• 4 of them
• N2 charged (1000 psig each)
• Enough inventory for 200% reserve

Question 9

Describe the air dryer in the CO system?

Answer 9

• Removes moisture
• Alumina
  
  • Blue it is good
  • Pink it needs to be changed

Question 10

Describe the Hyd fluid reservoir in the CO system?

Answer 10

• 800 gallons

- Temperature 85-115 degrees F

Question 11

Explain the Recirculating Tank?

Answer 11

• 5 gallon stainless steel
• Located downstream of the transfer filter
• Used for batch mode purification
• Used during the ‘caking’ process after replacing the fullers earth filters

Question 12

What are the four positions of the transfer and filtering system selector valve, CO-V204?

Answer 12

• Closed
• Discharge
• Recirc to Fluid Reservoir
• Discharge to recirculating tank

Question 13

Where is the automatic standby testing capability of the standby CO pump tested?

Answer 13

Locally with coordination of the CR

Question 14

Describe the automatic starting of a standby pump test.

Answer 14

• Coordinate with CR
• Manually relieve system pressure on an isolated section of system piping to test start the standby pump. Usually done during startup before the MT is reset.

Question 15

What is the fluid used in the EHC system? PPE?

Answer 15

Fyrequel
Check MSDS/CUP database.
Faceshield, gloves, and apron

Question 16

What does the Stealth EHC system do?

Answer 16

• Dry Gas blanketing system
• Excludes moisture/contaminants from EHC fluid
• Blankets CO system with super dry clean air

Question 17

What do the Fullers Earth filters do?

Answer 17

• Receive about 5% of flow
• Maintain pH close to neutral
• neutralize acids
• absorb water
• maintain chlorine content

Question 18

How are the Fullers Earth filters protected from over-pressure?

Answer 18

Two relief valves set at 75 psig

Question 19

Describe the heater/fan control system for control oil when the selector switch is in “Auto”.

Answer 19

Auto- less then 85 degrees F Fan and Heaters turn on. Heaters will turn off when temperature is above 85 degrees F. Fan will run for 10 more minutes to cool heaters.

Question 20

Describe the heater/fan control system for control oil when the selector switch is in “start”.

Answer 20

Fans will start but the heaters will not

Question 21

What are the transfer filter pumps used for?

Answer 21

Provide flow through fuller earth filters for oil purification.
When the hydraulic pumps are shut down, while adding fluid to the reservoir, or during unit power operations to bypass fluid in reservoir. Locally started and stopped.