ML100750430
| ML100750430 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 10/08/2009 |
| From: | Hiland P Division of Engineering |
| To: | Meena Khanna Division of Engineering |
| References | |
| FOIA/PA-2010-0010 | |
| Download: ML100750430 (4) | |
Text
Orf, Tracy From:
Hiland, Patrick Sent:
Thursday, October 08, 2009 3:26 PM To:
Khanna, Meena Cc:
Skeen, David
Subject:
FW: FYI-Crystal River re: Crack Found Exterior Containment Wall Importance:
High From: White, John IT2-\\
Sent: Thursday, October 08, 2009 3:13 PM To: Hiland, Patrick
Subject:
FW: FYI-Crystal River re: Crack Found Exterior Containment Wall From: Greives, Jonathan 10 Sent: Thursday, October 8, 2009 3:11 PM To: White, John Cc: Gray, Mel; Clifford, James; Bellamy, Ronald; Barber, Scott; Kern, David; Brand, Javier; Newport, Christopher
Subject:
FW: FYI-Crystal River re: Crack Found Exterior Containment Wall
- John, Here is the current status of the use of Crystal River OpE with regards to the TMI SG replacement:
The TMI 1 R18 refueling outage is scheduled to start Sunday 10/25/09 at midnight. TMI became aware of the Crystal River containment crack OpE on Monday, 10/5/09. TMI is in direct conversation with Crystal River and are following the issue extensively. Two representatives from TMI's steam generator replacement (OTSG) team are scheduled to go to Crystal River next Wednesday (10/14/09) to help them fully understand the causal factors. TMI plans to do a Technical Evaluation to address the Crystal River containment crack (delaminating) issue and its applicability to TMI. The residents engaged TMI on the Crystal River OpE on Monday, and have subsequently attended several meetings on the subject. Preliminarily, TMI believes that the Crystal River issue may not apply to TMI because Crystal River used a "Coral Aggregate" for their containment wall while TMI used a "Limestone Aggregate."
In addition, on 10/5/09, the TMI Resident Inspectors spoke with the Crystal River Residents about the containment crack and TMI's plans to begin de-tensioning 8 tendons while at power. A similar activity at Crystal River was cancelled due to licensing /thermal loading stress issues. The TMI residents have been working with DRS (Harold Gray) on the early de-tension issue since 9/24/09.
TMI has been evaluating their plans to do at-power de-tension of the 8 tendons since 9/24/09, when first challenged by the TMI Nuclear Safety Review Board (NSRB) and then subsequently by the NRC Residents during the NSRB subcommittee meetings. The initial schedule at TMI was to start de-tensioning today (10/8/09), however the activity has been put on hold until further evaluations are performed. TMI plans to do an Operational and Technical Decision Making (OTDM) evaluation to understand the difference between TMI and Crystal River design and licensing basis to determine if it is OK to continue their plans to de-tension the 8 tendons while at-power. They will also take into account the crack in Crystal River's containment wall into their OTDM. This activity ultimately requires Plant Manager approval prior to implementation.
TMI Outage Schedule Timeline:
1
10/6/09, (TMI at 97.6 % power, coasting down), rolled missile shield out of the way to start pre-load of some outage materials into containment. The TMI residents have reviewed TMr's process and controls for this activity and found OK.
10/8/09 Initial schedule to start early de-tensioning. TMI has completed a 50.59 Review and determined that no prior NRC approval is required. However, this activity was put on hold until further review and evaluation due to questioning by the TMI NSRB and the NRC. The early de-tensioning is to prepare (practice and familiarity) for the general tendon de-tensioning activities that will start upon shutdown. It is also expected to save up to 50 hours5.787037e-4 days <br />0.0139 hours <br />8.267196e-5 weeks <br />1.9025e-5 months <br /> of outage schedule / critical path.
10/13/09 OTDM evaluation authorizing early de-tensioning of 8 tendons is scheduled to be completed 10/14/09 If ODTM evaluation is approved, TMI will start early de-tensioning of 8 tendons 10/26/09, 0001, manual Rx Trip for 1R18 outage 10/26/09, 2030, start cutting into containment structure for OTSG removal & installation via hydro lazing (chipping off concrete), similar to the process used at Crystal River. The plant will be in Cold Shutdown prior to cutting the containment structure.
Note: The TMI containment liner will not be cut until fuel is fully moved. However, TMI does have a contingency plan in the event of unexpected delay in reactor defueling to allow controlled cutting of selected portions of the containment liner plate prior to TMI Rx being fully defueled. This is based on a calculation that takes credit for liner plate supporting stiffeners which remain intact and uncut until TMI reaches full defueled condition.
Ron (Bellamy) has a previously scheduled call with TMI's Plant Manager later this afternoon. The current status with regards to this issue will be one of the topics discussed. Additionally, DRS is reaching out to NRR regarding this issue. We will keep you updated if there are any changes with regards to the information presented. If you have any additional questions, please let me know.
Jon From: Gray, Mel Sent: Thursday, 6 ctober 08, 2009 10:29 AM To: Greives, Jonathan Cc: Bellamy, Ronald; Clifford, James
Subject:
FW: FYI-Crystal River re: Crack Found Exterior Containment Wall Importance: High John, per our discussion, please communicate w/ residents to understand licensee's consideration of this OpE from Crystal River and confirm our understanding of TMIs' scope of work, including timing of activity and factoring in this OpE. I realize we have information from the TMI drop-in that you will be considering. DRS has technical lead, including upcoming S/G replacement and ISI baseline inspections. We are supporting communication and assessment product lines.
DRS intends to communicate with R2 DRS (Marvin Sykes) today to gain further insights on Crystal River. For your information as of this morning, R2 plans an SIT, press release and public exit mtg.
Down the line, the OPE process will consider EOC to other containments under tension (CC, Ginna).
From: Roberts, Darrell Sent: Thursday, OctobdrO8, 2009 10:13 AM To: Modes, Michael; White, John; Gray, Mel 2
Cc: Gray, Harold; Wilson, Peter; Clifford, James; Bellamy, Ronald
Subject:
FW: FYI-Crystal River re: Crack Found Exterior Containment Wall Importance: High
- Michael, Here are more pics... pls dissiminate to the same group you did earlier (as appropriate). Good idea to have inspectors pick IWE/IWL as one of their samples during the outage inspection. But we should have a coordinated approach to how we're going to respond to this, as well as a consistent and coordinated set of messages to give our stakeholders in response to the likely increase in attention this will get up here.
Mel (and John White),
Per our discussion at the 0845 today, we need to understand what our licensees are doing w/r/t this issue.
John White should work together with DRP on how we're going to engage them on this. Of particular interest to me is where TMI is with their plans to cut up containment while they are still in TS Modes where it is required. I understand CR and TMI differ on the acceptability of this approach and I'd like to understand where we are with this issue today.
- thx, D JR From: Barkley, Richard (R-\\
Sent: Wednesday, October 07, 2009 7:31 PM To: Collins, Sam; Dapas, Marc Cc: Roberts, Darrell
Subject:
FW: FYI-Crystal River re: Crack Found Exterior Containment Wall Leigh shared these recent photos with me - You may have received them via another source already.
Crystal River is in the process of removing a large section of its containment wall to support a steam generator replacement. During the removal of the concrete, a lengthy, contiguous crack was noted interior to the concrete wall 10" in from the outside wall. This crack is currently being analyzed by a licensee contractor.
Crystal River is a post-tensioned concrete containment with a wall thickness of -42", similar in design to TMI-1, Millstone-2 and Calvert Cliffs-1 & 2; Ginna also has a modified post-tension design if memory serves me right, but only in the vertical direction.
The crack lines up with the vertical and horizontal (hoop) tension cables - Whether or not it is a safety significant flaw remains to be determined. My guess is that the tensioning cables put the inner 32" of concrete in such compression that it naturally separates slightly from the rigid outer 10" of concrete. Suresh Chaudary should be able to weigh in on whether that separation significantly weakens the overall strength of the wall when it is pressurized internally post-accident.
TMI-1 will be cutting a similar hole in its containment wall in the next few weeks, at which time Exelon could presumably observe a similar crack.
Since Calvert Cliffs and Milestone-2 were able to take their replacement steam generators through the equipment hatch, and Ginna went through the roof, such a condition would not have been revealed previously.
I'll let you know if I hear anything more on this.
3
From: Trocine, Leigh Sent: Wednesday, October 07, 2009 5:24 PM To: Barkley, Richard
Subject:
FW: FYI-Crystal River re: Crack Found Exterior Containment Wall From: Orders, William Sent: Wednesday, October 07, 2009 3:43 PM To: Wertz, Trent; Trocine, Leigh; Mallett, Bruce
Subject:
FW: FYI-Crystal River re: Crack Found Exterior Containment Wall From: Diaz-Toro, Diana Sent: Wednesday, October 07, 2009 2:28 PM To: Weaver, Doug; Marshall, Michael; Hipschman, Thomas; Beall, James Cc: Orders, William
Subject:
FYI-Crystal River re: Crack Found Exterior Containment Wall Please find attached additional pictures on the subject Crystal River issue.
Thank you.
Diana OEDO 301-415-8744 4