ECA-0.0 Daily Quiz

Question 1

Describe the RCP #1 seal design including type of seal, DP, and leakage flow rate. Also state how long by design an RCP can operate without all support systems.

Answer 1

Film riding seal
CCP Discharge - VCT Pressure
3 gpm
1 min

Question 2

What is the challenge to the primary during a loss of all AC power?

Answer 2

Loss of inventory through RCP seals with no makeup

Question 3

Describe FRP implementation during a loss of all AC

Answer 3

FRPs are not implemented until directed in recovery procedure

Question 4

When and at what rate is the secondary depressurized per ECA-0.0?

Answer 4

When at least one SG >13% NR depressurize at max rate within capacity to maintain SG level
Prevent undershoot 160#
If all SG levels fall below 13% NR depressurization must be stopped until level is restored

Question 5

What conditions determine which recovery procedure is entered after power is restored in ECA-0.0?

Answer 5

Subcooling >40
PRZ level >20%
ECCS equipment has not actuated
All must be satisfied to enter ECA-0.1

Question 6

Why is the secondary depressurization performed in ECA-0.0?

Answer 6

Minimize inventory loss through RCP seals to extend time to core uncovery

Question 7

Why is seal return isolated in ECA-0.0?

Answer 7

Prevent loss of NPSH and flashing at the CCP suction from high temp water
Prevent radioactive release in aux building
Prevent exceeding max seal leakoff flow rates

Question 8

Why does ECA-0.0 direct that the letdown isolation valves be closed rather than containment isolation valves on the letdown line?

Answer 8

Prevent RCS leakage from the letdown relief to the PRT

Question 9

What is the pressure value and the basis for the pressure value where the SG depressurization stopped in ECA-0.0?

Answer 9

290psig

Prevent Nitrogen injection

Question 10

Why is SI reset in ECA-0.0?

Answer 10

Prevent automatic loading of equipment on restored bus

Question 11

Why are emergency bus loads take to pull to lock?

Answer 11

To prevent overloading the restored power source

ESW left running for EDG

Question 12

What actions are taken when power to an emergency bus is restored during performance of ECA-0.0?

Answer 12

Go to step 34, determine if ELAP in progress

Question 13

What is the reason for the loop ECA-0.0 places you in?

Answer 13

Continuously monitor plant conditions while waiting for power restoration

Question 14

Prior to restoring power what procedures and under what conditions can a transition be made from ECA-0.0?

Answer 14

SACRG-1 if highest 5 CETCs > 1200 F and rising

Question 15

Why are the CCPs and CCW pumps prevented from starting upon restoration of power?

Answer 15

Prevent thermal shock to RCP seals and steam introduction to the CCW system

Question 16

Why may a BAT pump be started prior to starting a CCP per ECA-0.1?

Answer 16

To prevent loss of NPSH and flashing in the CCP suction

Question 17

What procdures are implemented after ECA-0.1 and ECA-0.2 are completed?

Answer 17

ECA-0.1 to ES-0.2

ECA-0.2 to E-1

Question 18

What is the basis for waiting until the step in ECA-0.1 or ECA-0.2 allows you to implement FRPs?

Answer 18

FRPs assume at least one emergency bus is energized and loaded

Question 19

Why isnt seal cooling restored to the RCPs following restoration of power?

Answer 19

Damage of seals and warping the shaft due to thermal shock

Question 20

What method is used to cool the rcp seals

Answer 20

cooldown the RCS