EOP-SDP-2 Response to Loss of RNS during Shutdown

SDF-0 Entry Condition

Non SDF-0 Entry Conditions

Reduce Heat Input, Isolate Dilution, etc.

(Steps 1-4)

Stop Vac Fill, Close Containment, SDP-1 Assessment

(Step 5-9)

Aligning CCS for RNS Cooling

(Step 13)

c. RNS Hx Inlets OPEN

d. CCS Flow >2685gpm

Safety System Actuation Direction

(Step 23)

Conditions to ignore SDP-1 during subsequent steps

Unable to establish RNS and/or applicable support systems

OR

Actuation of ANY: “S”/1st Stage/4th Stage/IRWST Inj/Ctmt RR

Isolating Unnecessary RCS Vent Paths

(Step 26)

RCS Open Status

(Step 29)

Refilling RCS

(Step 35 Branch)

*Step 37 carried out if RCS is NOT OPEN

Establishing Normal CVS MU

(Step 41)

Notice:

If Bleed and Feed Required, then “S” Actuated CVS Maximum MU is utilized per step 47

RCS Pressure Control Method

Bleed and Feed Criteria

(Steps 44-46)

Hot Leg Level

(Step 57)

IRWST Containment Recirculation

(Step 62)

a. IRWST <25.7%

b. “S” RESET

Hydrogen Igniters

(Step 63)

PCS Actuation

(Step 64)