AOP-103 (2) Steam Generator Tube Leak

Symptoms and Entry Conditions

From A-112 RCS Leak

SGTL >5gpd

Rad alarm on Noble Gas, N16, EDI, Turbine Vent

Chem samples

If Leak Rate >100gpm

(Step 2)

Trip the Reactor

Implement E-0 while continuing A-103

***If “S” is NOT actuated in E-0 continue with A-103 concurrent with ES-0.1

If somehow you are <100gpm leak but NOT maintaining PZR Low MU setpoint

(Step 3 and RNO)

Blowdown Radiation Alarms, difference between High-1 and High-2?

High-1:
Ensure Product and Reject diverted to WLS
Ensure BD Disch diverted to WRS
Refer to SOP

High 2:
Ensure Valve 5 & 6 isolation

When within LCO limit (150gpd), check every 15min

Leak rises >30gpd/hr OR N-16 unavailable

(Step 7 and RNO)

Shutdown per A-101
Reduce to <50% within 1 HOUR
Establish MODE 3 within 2 HOURS after (t=3hrs from 0)

***If leak degrades by <30gpd/hr: Get in MODE 3 within 6 hours per any applicable G or A-101

When between 75-150gpd
(Step 8and RNO)

If >75gpd for >1 Hour Get in MODE 3 within 24 hours per any applicable GOP or A-101

Notice:

Any leak rate >75gpd will require shutting down and borating to MODE 5 Xe-free via Step 20

When between 30-75gpd

(Step 9 and RNO)

>75gpd Procedure Go To Step 12, anything less the procedure is exited after monitoring/stabilizing leak

(Step 11-12)

Minimize Secondary Containment BDS & Turbine Sumps

(Step 15 & 16)

Next Overview Steps

(Step 18-23)

Step 18: WAIT until Shutdown

Step 19: Align CVS MU

Step 20: Borate to MODE 5 No Xe

Step 21-23: Equalize PZR/RCS Boron with sprays/heaters/LD

Requirement to Isolate SG

(Step 24)

Definition of “INTACT SG” per A-103 deep within procedure
(Step 25)

INTACT: Un-isolated SG with leak LESS than 150gpd

How much to feed Leaking SG?

(Step 31)

Feed until SGNR is >34%

RCP Status

(Step 32)

Next Actions Overview

(Step 34-57)

Depressurize below 1920psig with normal or auxiliary spray or ADS Stage 1. Then Block “S”

Cooldown to 350°F by dumping steam (intact)

Depressurize below 950psig, Isolate Accumulators

Depressurize below 417psig

Caution of depressurizing without RCPs running

(Caution prior to Step 56)

Upper Head may Void, resulting in Rapid rising PZR Level

Adjust NOT-intact SG PORV to what?

1160psig

Basis: Still within band of design setpoint, but maintain as much nasty inventory as possible

Criteria to Terminate Depressurization

(Step 58)

When NOT to release steam from a leaking SG

(Step 63 Caution)

Procedure End/Exit

(Step 68-70)

Aux Boiler Implementation

Differences between A-101 and A-103

A-101: Must be below 360MWe

A-103: Do it as soon as you get to Step 17 (Don’t wait on a power level)