ECA.0-0 Series (RQ-C-4741)

Question 1

During step 4 of ECA-0.0 (Establishing AFW > 240K), the STA tells the US that a transition to FR-H.1 is necessary due to a valid RED PATH in Heat Sink. The US verifies that there is a valid RED PATH for Heat Sink. What should the crew do?

Answer 1

Status trees should be monitored for information only

Question 2

The primary reason Seal Return valves are isolated in ECA-0.0 is to:

Answer 2

Prevent steam binding of the Charging Pumps

Question 3

The cooldown and depressurization at 100ºF/hr in ECA-0.0 is performed in order to:

Answer 3

Minimize RCS inventory loss through the RCP seals, which maximizes time until core uncovery.

Question 4

During the cooldown at 100ºF/hr in ECA-0.0, 2 of the 4 SG levels drop below 13%. Should the cooldown be stopped to recover SG level?

Answer 4

No. One intact SG is required to be above 13% minimum level.

Question 5

During step 9 of ECA-0.0, the US puts down ECA-0.0 and starts directing SUP-012 to restore power. The STA tells the US that he should continue with ECA-0.0 while SUP-012 is performed. Is the STA correct?

Answer 5

YES! The STA is correct. The US needs to continue directing steps in ECA-0.0 in order to start the cooldown as soon as possible.