40AO-9ZZ10 Condenser Tube Rupture Flashcards
How is Condenser Tube Rupture Defined?
- CW leak through condenser > 1 gpm
What are the Entry conditions for 40AO-9ZZ10 Condenser Tube Rupture
Condition 1:
- Hotwell Na > 1.5 ppm
- Hotwell Cond > 30 umho/cm
Condition 2:
- SG Na is or expected > 0.1 ppm
- SG Cond is or expected > 2 umho/cm
- Chemistry parameters indicate so
Condition 3:
- Tube leak exists and management says so to make repairs
What are the major mitigating steps for 40AO-9ZZ10 Condenser Tube Rupture?
- Chemistry sample determine affected half
- Close/ Isolate Hotwell Drawoff
- Close CW X-Tie
- Align BFT vent to Condenser
- Place HDT’s in L/A
- Put demins in svc with 195 CLOSED
- Reduce power to 40%
- 60% stop 1 CW pump
- 40% isolate ruptured train
During 40AO-9ZZ10 Condenser Tube Rupture what are the required number of demin vessels?
30/ 20/ 20/ 30:
- 100-70% - 5
- 70 - 50% or both MFP’s - 4
- 50 - 30% 1 MFP running - 3
- < 30% - 2
During 40AO-9ZZ10 Condenser Tube Rupture, what is the down power target and why?
- 40%
- Able to isolate CW train
During 40AO-9ZZ10 Condenser Tube Rupture, at what power do you stop the First CW pump in the affected loop
- 60%
During 40AO-9ZZ10 Condenser Tube Rupture and a plant shutdown is desired, when do you trip the Rx?
- < 20%
During 40AO-9ZZ10 Condenser Tube Rupture, what is Rx Trip Criteria?
- 1 train of CW in svc and its ruptured
- SG Na, Sulfates, Cl-, ≥ 1.0 ppm with ↑ cation cond
- SG Cond ≥ 15 umho/cm with ↑ Na, Sulf, Cl
- Hotwell Na > 35 ppm
- Minimum demins not available and CRS says so
During 40AO-9ZZ10 Condenser Tube Rupture, What indicates that CW level has drained below the ruptured tube while draining?
- Increase in AR pump off gas flow
During 40AO-9ZZ10 Condenser Tube Rupture, what level do you maintain the unaffected hotwell half and why?
- ≥ 41”
- Full suction from 1 half causes ≈ 10” drop
