At Turkey Point, we normally schedule downpowers so they don't cross shift turnover. Recently, however, we had an emergent downpower that was in progress at shift turnover. At the time, the reactivity plan called for rod insertion every 15 minutes for axial power distribution control. During shift turnover (about 30 minutes), Ops did not move rods, so the axial shape diverged from predicted. It was still in the target band, but more positive than we wanted. (And it stayed more positive the rest of the way down.) Based on this experience, I wanted to find out how other sites manage Ops shift turnover during power changes. Does your site keep turnover time sacred with no reactivity changes, do you make maintaining the core "on track" a priority, or do you balance the two?
Mark Dicus PTN Reactor Engineering mark_dicus@fpl.com 305-246-6185
We would most likely stop the maneuver but keep ASI in band - a balance of the two.
Clint Alday
Waterford 3
-----Original Message----- From: pwrrm@retaqs.com [mailto:pwrrm@retaqs.com] On Behalf Of Mark_Dicus@fpl.com Sent: Wednesday, October 22, 2008 5:18 PM To: pwrrm@retaqs.com Subject: [Pwrrm] Power Maneuvers and Shift Turnover
At Turkey Point, we normally schedule downpowers so they don't cross shift turnover. Recently, however, we had an emergent downpower that was in progress at shift turnover. At the time, the reactivity plan called for rod insertion every 15 minutes for axial power distribution control. During shift turnover (about 30 minutes), Ops did not move rods, so the axial shape diverged from predicted. It was still in the target band, but more positive than we wanted. (And it stayed more positive the rest of the way down.) Based on this experience, I wanted to find out how other sites manage Ops shift turnover during power changes. Does your site keep turnover time sacred with no reactivity changes, do you make maintaining the core "on track" a priority, or do you balance the two?
Mark Dicus PTN Reactor Engineering mark_dicus@fpl.com 305-246-6185
We try not to cross a shift turnover, but that is not possible sometimes. We generally try to turnover during stabilization. When it does happen, the at-the-controls-operator and reactivity SRO turnover at the boards. Both will remain in place until the relief is up to speed. We would not stop the downpower and the reactivity SRO would be responsible for maintaining the plan.
________________________________
From: pwrrm@retaqs.com on behalf of Mark_Dicus@fpl.com Sent: Wed 10/22/2008 5:17 PM To: pwrrm@retaqs.com Subject: [Pwrrm] Power Maneuvers and Shift Turnover
At Turkey Point, we normally schedule downpowers so they don't cross shift turnover. Recently, however, we had an emergent downpower that was in progress at shift turnover. At the time, the reactivity plan called for rod insertion every 15 minutes for axial power distribution control. During shift turnover (about 30 minutes), Ops did not move rods, so the axial shape diverged from predicted. It was still in the target band, but more positive than we wanted. (And it stayed more positive the rest of the way down.) Based on this experience, I wanted to find out how other sites manage Ops shift turnover during power changes. Does your site keep turnover time sacred with no reactivity changes, do you make maintaining the core "on track" a priority, or do you balance the two?
Mark Dicus PTN Reactor Engineering mark_dicus@fpl.com 305-246-6185
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Beaver Valley Response:
We would try to schedule the downpower all in one shift if possible. If not, we would look for convenient hold-points such as around 25% power where we switch from the Main Feed Reg Valves to By-pass and perform the turnover at this "hold". The reactivity SRO and operator on-the-board would relieve at the control board so that reactivity control is maintained during the evolution.
Anthony (A.R.) Burger Supervisor, Reactor Engineering FENOC - Beaver Valley Power Station Phone: (724) 682-4108 Cell: (724) 601-3224 FAX: (724) 682-4250 Email: aburger@firstenergycorp.com
Mark_Dicus@fpl.co m Sent by: To pwrrm@retaqs.com pwrrm@retaqs.com cc
10/22/2008 06:15 Subject PM [Pwrrm] Power Maneuvers and Shift Turnover
Please respond to PWR Reactivity Management <pwrrm@retaqs.com >
At Turkey Point, we normally schedule downpowers so they don't cross shift turnover. Recently, however, we had an emergent downpower that was in progress at shift turnover. At the time, the reactivity plan called for rod insertion every 15 minutes for axial power distribution control. During shift turnover (about 30 minutes), Ops did not move rods, so the axial shape diverged from predicted. It was still in the target band, but more positive than we wanted. (And it stayed more positive the rest of the way down.) Based on this experience, I wanted to find out how other sites manage Ops shift turnover during power changes. Does your site keep turnover time sacred with no reactivity changes, do you make maintaining the core "on track" a priority, or do you balance the two?
Mark Dicus PTN Reactor Engineering mark_dicus@fpl.com 305-246-6185_______________________________________________ PWRRM mailing list PWRRM@retaqs.com http://www.keffective.com/mailman/listinfo/pwrrm
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aburger＠firstenergycorp.com -
ALDAY, CLINT L -
Mark_Dicus＠fpl.com -
SCHAWE, BARTON P