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)
The level of review is the same no matter how large the reactivity
maneuver. Our procedures do recommend a challenge board for extra
special complicated reactivity maneuvers but this option has never been
implemented and our Ops, quite frankly, have no idea on when they might
want to exercise that option. The review includes RXE originator, RXE
reviewer, RXE Supervisor review, and Ops Management review. Then, an
on-shift SRO must activate any plan for the particular reactivity
maneuver to be performed. We typically will develop a plan for any
maneuver for which we enough time to develop the plan.
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)
We have no proceduralized criteria for requiring a revised plan. Yet
again, it depends upon the time available to revise the plan. We have
had delays during downpowers or power escalation for which the delay is
indeterminate until Ops says, "OK, it is fixed." Reactivity Maneuver
guidance is just that, guidance. When such delays occur, the overall
guidance such as actions, limits, etc. don't change. The only thing
that changes in these cases are the predicted amounts and timing of
borations and dilutions. On the other hand, whenever we anticipate a
schedule that could float, we will typically produce calculations that
bound the schedule on either end and provide guidance on how to
interpolate the predicted numbers depending on how long a particular
activity takes. WBN could make some improvements in this area.
Additional question
How do other stations incorporate any ramp rate restrictions that may
apply? (Ramp rate alarm, operator training, ramp plan)
The ramp rate restrictions are included in a detailed governance
procedure with a single paged "Reactivity Briefing Sheet" with a summary
of the limits that apply to the reactor at the current time. The
guidance for the "Reactivity Control Plan" for the particular reactivity
maneuver complies with the ramp rate restrictions. We currently have no
alarm, but we have a request for computer people to create one for us.
We trained the operators over a year ago, but they need a refresher.
Call me and I can share information more informally and more freely.
Kevin S. Elam
Reactor Engineer
(423)365-8806
Pager 14211
________________________________
From: Greer, C. Dale
Sent: Wednesday, October 08, 2008 10:53 AM
To: Elam, Kevin Scott
Subject: FW: [Pwrrm] Reactivity plan approval and revisions/ramp rate
alarm
Please respond.
________________________________
From: pwrrm(a)retaqs.com [mailto:pwrrm@retaqs.com] On Behalf Of
Vandergriff, Jon-Michael
Sent: Tuesday, October 07, 2008 3:16 PM
To: pwrrm(a)retaqs.com
Subject: Re: [Pwrrm] Reactivity plan approval and revisions/ramp rate
alarm
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.
Jon-Michael Vandergriff
Catawba Nuclear Station
Reactor Engineering
(803) 701-4029
jvandergriff(a)dukeenergy.com
Rule #113 - Don't look for opportunities; make them.
________________________________
From: Keller, Lee A
Sent: Monday, June 30, 2008 9:33 AM
To: Vandergriff, Jon-Michael
Subject: FW: [Pwrrm] Reactivity plan approval and revisions/ramp rate
alarm
Pls answer.
________________________________
From: pwrrm(a)retaqs.com [mailto:pwrrm@retaqs.com] On Behalf Of
Adina.K.Lafrance(a)dom.com
Sent: Monday, June 30, 2008 9:20 AM
To: pwrrm(a)retaqs.com
Subject: [Pwrrm] Reactivity plan approval and revisions/ramp rate alarm
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(a)Dom.com
Phone: 757-365-2658
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