EOP-ES-1.4 (1) ADS Stage 4 Actuation Response

*Disclaimer: There is a lot of overlap with ES-1.3 ADS Stages 1-3 Actuation Response, the two notecard sets should be studied TOGETHER since some items are NOT repeated in this set

Critical Safety Function Status Tree monitoring during ES-1.4

(Step 1 Note)

What MUST happen prior to assessing/actuating ADS Stage 4?

How do we manually actuate Stage 4?

<1200psig

OR

>128sec since ADS Stage 3

Manually Checking/Ensuring ADS Stage 4?

Time delay between ADS stages?

(Step 4)

Notice Actions to Actuate DAS ADS 4

Same switches actuate BOTH trains

*ADS Stage 4 designed to depressurize to 13psig

Can RNS be placed in service if Containment is >100 Rad/hr?

*ES-1.3 requires EMERGENCY DIRECTOR to utilize RNS in a high containment rad condition, ES-1.4 allows the Shift Supervisor to decide

**This difference may be an oversight only, (background of BOTH procedures regard SS) This is an open parking lot item

Requirement to start an RNS pump? (Cooling)

(Step 17)

Maximum RNS flow and background?

(Step 30)

Background:

“Heat exchanger outlet flow control valves are throttled to maximize flow through the RNS heat exchangers while the flow control valves ensure total RNS flow does not exceed limitations for debris loading on the screens.”

Entry Path?

(Basic FOP from E-0)

ADS Stages 1-3 will lower pressure to?

ADS Stage 4 will lower pressure to?

1-3: 100psig

4: 13psig

How to DAS Actuate ADS Stage 4?

ARM for ≥1second

MUST RETURN ARM Switch to NEUTRAL

FIRE within 25seconds