Control Oil Flashcards
What does the Control Oil system do?
Provide control oil for;
- MS Control Valves
- MS Stop Valves
- CIV’s
- Electro hydraulic control System
Describe the hydraulic fluid pumps?
- NGN
- 1600 psig normal
- 1 normally running, 1 in standby
When does the standby hydraulic pump come on?
1300 psig
When will the MT trip on low CO pressure?
1100 psig (2 out of 3 logic)
What provides cooling for the CO system?
TCW
If IA is lost what is the effect on the CO system?
The TCW temperature control valve will fail open. An AO will have to throttle the bypass valve and close the temperature control valve.
When will the CR get Hi and Lo temperature alarm in regards to the CO system?
Hi- 135 degrees F
Lo- 85 degrees F
Explain the control oil accumulators?
- 4 of them
- N2 charged (1000 psig each)
- Enough inventory for 200% reserve
Describe the air dryer in the CO system?
- Removes moisture
- Alumina
- Blue it is good
- Pink it needs to be changed
Describe the Hyd fluid reservoir in the CO system?
- 800 gallons
- Temperature 85-115 degrees F
Explain the Recirculating Tank?
- 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
What are the four positions of the transfer and filtering system selector valve, CO-V204?
- Closed
- Discharge
- Recirc to Fluid Reservoir
- Discharge to recirculating tank
Where is the automatic standby testing capability of the standby CO pump tested?
Locally with coordination of the CR
Describe the automatic starting of a standby pump test.
- 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.
What is the fluid used in the EHC system? PPE?
Fyrequel
Check MSDS/CUP database.
Faceshield, gloves, and apron
What does the Stealth EHC system do?
- Dry Gas blanketing system
- Excludes moisture/contaminants from EHC fluid
- Blankets CO system with super dry clean air
What do the Fullers Earth filters do?
- Receive about 5% of flow
- Maintain pH close to neutral
- neutralize acids
- absorb water
- maintain chlorine content
How are the Fullers Earth filters protected from over-pressure?
Two relief valves set at 75 psig
Describe the heater/fan control system for control oil when the selector switch is in “Auto”.
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.
Describe the heater/fan control system for control oil when the selector switch is in “start”.
Fans will start but the heaters will not
What are the transfer filter pumps used for?
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.