40AO-9ZZ11 CEA Malfunction

Question 1

What are CEA Malfunction trip criteria

Answer 1

• Uncontrolled CEA movement (continues after out of AS)
• 1 CEA deviates >6.6” and reg group below TIL
• 2 or more CEA >9.9” deviation
• CPC ASI ± 0.45 trending to 0.5
• 12 finger CEA misaligned and cant be restored before DNBR/LPD trips
• CEA deviation prior to criticality (2 or more CEA >9.9”)

Question 2

What are the required power reductions for CEA slip/drop

Answer 2

• > 80% 20% Down power
• 70-80% 15% Down power
• 45-70% 10% Down power
• 35-45% 5% Down power

Question 3

How long do you have to START a down power on a slipped/drop CEA

Answer 3

10 Minutes

- 15 per FSAR

Question 4

How long do you have to COMPLETE a down power for a slipped/drop CEA

Answer 4

1 Hour

Question 5

How is the initial down power for a slipped/drop CEA accomplished

Answer 5

• Lower Turbine load
• Maintain Tavg>Tref 3-3.5*F

PZR Lvl LCO May be entered

Question 6

What is the required boration rate for a slipped/drop CEA down power

Answer 6

35 gpm or greater

STA worksheet, borate at 40gpm

Question 7

What procedures are you allowed to use to align for boration on a slipped/drop CEA down power

Answer 7

• AOP

- Emergency Boration AOP?

Question 8

How long do you have to realign CEA’s following a slip/drop

Answer 8

2 Hours

• If not met commence shutdown
• LCO 3.1.5. C Mode 3 in 6 hours

Question 9

How do CPC’s react to a 12 finger CEA misalignment

Answer 9

• affected quadrant CPC trip
• CEAC PF builds in other channels
• PF builds in over 6 hours

Question 10

How does COLSS react to a slipped NOT dropped CEA

Answer 10

• Rod bottom contact not actuated Pulse counter not reset CEA position unkown
• CEA position used for DNBR/LPD POL’s now bad
• ASI/Tilt used incore still good

-COLSS is NOT out of service

Question 11

How does a CEA slip >7.5” (without resetting pulse counter) affect LHR and DNBR LCO’s

Answer 11

• LCO’s not met
• Enter condition A
• Restore in 1 Hour

Question 12

What actions are required if COLSS is OOS

Answer 12

• 72ST-9RX03 DNBR/LHR/ AZTILT/ASI
• LHR/ DNBR adverse trend assumed LCO not met enter Condition B
• Determine Trend Every 15 minutes

Question 13

Are you allowed to Prompt and Prudent place CEDMCS in STBY for CEA motion

Answer 13

• Inward motion NO

- Outward motion YES

Question 14

How are misaligned CEA’s recovered?

Answer 14

• Place CEDMCS in MI
• Align affected CEA’s to group
• Maintain Tavg/ref <3*F
• MAX 2 step difference between all affected CEA’s