EOP Week 9 & 10

Question 1

What are the Modes of Applicability for ECA-0.0 (Loss of All AC Power)

Answer 1

• Modes 1-4

Question 2

What are the DIRECT ENTRY conditions for ECA-0.0 (Loss of All AC Power)

Answer 2

• Loss of power to T11A AND T11D

Question 3

While restoring power during ECA-0.0 (Loss of All AC Power) which pumps ARE NOT taken to PTL and WHY

Answer 3

• ESW pumps

- Ensures EDG have cooling

Question 4

While in ECA-0.0 (Loss of All AC Power) what should be done with the Alternate ESW supply valves to the EDG

Answer 4

• Remain isolated to protect from common cause failure (silt/mud) UNLESS the normal supply is not available

Question 5

While in ECA-0.0 (Loss of All AC Power) what is the ONLY transition out of the procedure WITHOUT restoring power

Answer 5

• IF 5 highest CETC are GREATER THAN 1200 deg F and rising, THEN transition to SACRG-1

Question 6

In order to start recovery actions in ECA-0.0 (Loss of All AC Power) after AC power is restored to an emergency pump bus how many SDGs are required if they are the only source of power

Answer 6

• Two SDGs are required if the SDGs are the ONLY source of power

Question 7

While in ECA-0.0 (Loss of All AC Power) AFTER AC power has been restored, what transition is made if the following conditions exist:

• Subcooling is GREATER THAN 40 deg F
• Pressuirizer Lever is GREATER THAN 16%
• ECCS pumps are NOT providing FLOW

Answer 7

• ECA-0.1 (Loss of All AC Power Recovery w/o SI)

Question 8

While in ECA-0.0 (Loss of All AC Power) AFTER AC power has been restored, what transition is made if ANY of the following conditions exist:

• Subcooling is LESS THAN 40 deg F
• Pressuirizer Lever is LESS THAN 16%
• ECCS pumps are ARE providing FLOW

Answer 8

• ECA-0.2 (Loss of ALL AC Power Recovery w/ SI Required)

Question 9

If the four hour coping period assumed in ECA-0.0 (Loss of All AC Power) is exceeded what is a potential consequence

Answer 9

• The top of the U tubes in the SGs may be uncovered which will stop natural circulation flow

Question 10

While in ECA-0.0 (Loss of All AC Power) what is the basis for the secondary side depressurization steps

Answer 10

• Minimize inventory loss through the RCPs to extend time to core uncovery

Question 11

While in ECA-0.0 (Loss of All AC Power) if seal injection flow is lost for a prolonged period of time WHY is seal injection flow NOT re-estabilshed

Answer 11

• To prevent damage to the seals and to prevent RCP shaft warping

Question 12

While in ECA-0.0 (Loss of All AC Power) if CCW is lost for an extended period of time, what action is taken

Answer 12

• Perform a cooldown to re-establish cooling from the RCS to the RCP seals

Question 13

While in ECA-0.0 (Loss of All AC Power) why must QCM-350 be closed within 15 minutes

Answer 13

• Prevent steam binding a CCP
• Reduce potential release
• Prevent exceeding maximum seal leakoff flow rates

Question 14

During a loss of power, after SI is reset will pumps automatically load after power is restored

Answer 14

• NO

Question 15

While in ECA-0.0 (Loss of All AC Power) what equipment is de-energized to prolong DC battery capacity

Answer 15

• Disable AMSAC
• De-energize DCS Inverters
• Stop all DC Powered Turbine Oil Pumps

Question 16

While in ECA-0.0 (Loss of All AC Power) why are cabinet doors opened within 30 minutes

Answer 16

• To control temperature

Question 17

While in ECA-0.1 (Loss of All AC Power w/o SI) which optimal recovery EOP is desired

Answer 17

• Transition to ES-0.2 (Natural Circ Cooldown) is the goal

Question 18

While in ECA-0.1 (Loss of All AC Power w/o SI) if VCT temperature is high, what actions are required

Answer 18

• Use a BAT pump to pressurize the CCP suction to maintain NPSH

Question 19

While in ECA-0.2 (Loss of All AC Power w/ SI required) which optimal recovery EOP is desired

Answer 19

• Transition to E-1 (Loss of Reactor or Secondary Coolant) is the goal