1)       the level of review a plan requires (such as <10% requires shift supervision, >10% requires shift management, >50% requires station management)

Any plan > 15% (or at OPS request) where we have more than 6 hours to prepare, requires a formalized plan from Reactor Engineering.  These plans must be approved by the Ops Shift Manager, Control Room SRO, and RO at the controls prior to commencement.

 

2)       or

2) when a reactivity plan must be revised (such as > 1 hour delay, rods > 10 steps from the predicted value, current power level step >2% from predicted)

 

IF Reactor Engineering is providing continuous coverage for a maneuver

 

IF actual plant conditions deviate from the guidance by ≥ 3% Rated Thermal Power, maneuver guidance SHALL be updated per Limit and Precaution 6.3.1.

 

IF control rod position is within 15 steps of Rod Insertion Limit OR

 

IF T-Avg deviates more than three degrees from prediction or T-Ref at any time step, it is recommended that maneuver guidance be updated per Limit and Precaution 6.3.2.

Maneuver guidance MAY also be updated at the discretion of Operations and Reactor Engineering.

Additional question

How do other stations incorporate any ramp rate restrictions that may apply?  (Ramp rate alarm, operator training, ramp plan)

 

The ramp rates are accounted for during the generation of the plan.

 

 

 

Pls answer.

 

 

SOER 07-01 recommendation 3 stated that "plans for significant reactivity changes are reviewed and approved by appropriate station and shift operations management..." and "If plant conditions delay power changes, the reactivity plan is revised to meet the new plant conditions and approved by management".  

Does anyone have specific thresholds for:

1) the level of review a plan requires (such as <10% requires shift supervision, >10% requires shift management, >50% requires station management)

or

2) when a reactivity plan must be revised (such as > 1 hour delay, rods > 10 steps from the predicted value, current power level step >2% from predicted)


Additional question

How do other stations incorporate any ramp rate restrictions that may apply?  (Ramp rate alarm, operator training, ramp plan)

Thank you.  

Adina LaFrance

Nuclear Analysis & Fuel
Reactor Engineer
Surry Power Station
Email: Adina.K.LaFrance@Dom.com
Phone: 757-365-2658
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