Entry Conditions:

> 5%/min / no greater than 15%/min

Any requirement to reduce turbine load/power at rates which are NOT accomplished by any other Abnormal Operating Procedures OR at a rate specified by the Shift Manager (SM).

Continuous Actions:

If RCS temperature is ≤535°F or ≥581°F, Trip | Confirm | EOP-TRIP-1 (prevent exceeding TS temperature limits, prevent challenging RPS)

If >15% / minute reduction req’d – Trip | Confirm | EOP-TRIP-1

If RCS temperature is ≤ 543°F initiate ATT 2

IF AT ANYTIME any of the following conditions occur THEN LOG the condition lAW
SC.OP-AP.ZZ-0004(Q), Cyclic Data Monitoring Program:
 ≥5% per minute load swing, between 15% load and full load
±10% step change in load, between 15% load and full load.

If a main turbine trip is required <P-9 and steam dump system is available, place rods in manual, trip the turbine, and go to AB.TRB-0001(rods in manual to prevent continuous inward rod motion due to T_AVG > T_REF while steam dumps are in the T_AVG mode)

Path:

Initiate turbine load reduction ≤15%/min

Maintain TAVG on program by rods, Boration or Dilution, and turbine load

Energize PZR heaters (provide mixing of Boron, smoother pressure control)

Initiate boration to maintain rods > RIL

Transfer heating steam to another source or isolate Aux. building heating steam by shutting 1HS44

When <75% RTP stop 1 of 3 condensate pumps

When <49% verify below P-9 illuminated

When ≈40% stop all heater drain pumps; if MSR Drain Tank levels are unstable, send an operator to throttle HD9(s)

When <36% verify below P-8 illuminated

When <35% select one SGFP control to manual and reduce speed to idle

When <30% open the MS7s

When <100 MWe (~8%) stop turbine load reduction

When <20% transfer rods to manual, maintain TAVG on program, stop the BSCDT pumps, shut BF44, set AF21s to 0% and start MDAFW pumps
Initiate IOP-5 or IOP-3

Evaluate steam dump availability

If unavailable, set MS10s to approximately equal SG pressure

If available, select MS pressure control mode with setpoint approximately equal SG pressure (done in preparation for turbine trip, MS pressure mode eliminates TAVG deadband)

Trip main turbine

Continue the power reduction using rods as required

When <10% verify P-10 extinguished and below P-7 illuminated

When <5% shut the GB4s, establish AF flow to each SG, maintain levels 33 ±5%, shut the BF19s and BF40s, reduce SGFP speed to idle (trip if required to control cooldown rate), shut the BF22s, stop all but 1 condensate pump

If the reactor is to remain critical, maintain reactor power ≤2%, T_AVG 543-550°F, and rods > RIL

If a shutdown is required insert control and shutdown banks, ensure SRNIs energized at <7x10-11 ICA, and open RTBs when all rods are inserted

If shutdown exceeded 15% within 1 hour, notify chemistry of TS sample requirements (2-6 hrs for RCS sample and plant vent sampling and analysis completion within 48 hrs)

Shift to appropriate IOP

If Steam Dump Load Rejection is ARMED and Steam Dump valve demand is Zero with all valves closed, then RESET Load Rejection.

Attachment 2, Minimum Temperature for Criticality:

l  Stop boration

l  Close malfunctioning MS-10(s)

l  Close malfunctioning Steam Dump(s)

l  Reduce Turbine load

l  Only then, if RCS temperature is rising, and is ≥ 541°F or has been < 541°F for < 15 minutes, slowly adjust Control Rods as required to maintain T_avg on program while monitoring R_x power.

A faster overall rod speed could be possible in manual depending on mismatch.
Manual rod speed is 48 steps/minute.
Automatic rod speed varies from 8 to 72 steps/minute.