EOP-FR-S.1 (1) Response to Nuclear Power Generation - ATWS

Entry Path

Entry Path

Direct?

F-0?

How to check all rods fully inserted?

(Step 1)

Actions if Rod Control can NOT be deenergized?

(Step 1 RNO)

Borate Actions

Need BOTH CMTs to avoid DAS Act.

PRHR Actuation

(Step 4)

Local Dispatches and Requirements to execute

(Step 6 and RNO)

P-3 OFF or RDMG Sets energized: Local RTBs and Local SUPPLY breakers

Turbine still online: Local Pedestal Trip

Safeguards Implication

(Step 8 and RNO)

AC Power Loss Implication

(Step 9 and RNO)

Feedwater Priorities

Step 10: Establish ≥1 MFWP through SFW Lines

RNO: Start BOTH SFWPs through SFW Lines

How to isolate Dilution Path(s)

(Step 13 and RNO)

How to check for Uncontrolled Cooldown Reactivity Insertion

(Step 18)

Steps 19-20: Isolate MSL and Check for Faulted SG(s)

Requirement to Exit FR-S.1 and perform Core Cooling mitigation

(Step 22 and RNO)

This is essentially proceduralized priority changing, you have performed 21 steps of subcriticality mitigation now if there’s a red path on C, go to FR-C.1

How to Check the Reactor is Subcritical

(Step 23)

Status of CVS MU at procedure completion?

(Step 28)

Review Question from Training Material

If Reactor is tripped from DAS via E-0 IOA RNO(s), is EOP-FR-S.1 entry required?

How does the DAS reactor trip affect CRDMGs?

NO, if <5% via E-0 IOAs do not enter FR-S.1

DAS trips open the Field Voltage breakers

Review Question from Training Material

Why is PRHR required to be actuated?

Why does PRHR Actuation close BOTH SG Blowdown isolations per SG?

Prevent Pressurizer overfill

Maintain SG inventory