ML11286A024
| ML11286A024 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 09/26/2011 |
| From: | Schofield L Exelon Generation Co |
| To: | Nicholas Difrancesco Office of Nuclear Reactor Regulation |
| References | |
| Download: ML11286A024 (4) | |
Text
1 NRR-PMDAPEm Resource From:
Lisa.Schofield@exeloncorp.com Sent:
Monday, September 26, 2011 2:47 PM To:
Mahoney, Michael Cc:
DiFrancesco, Nicholas; jay.smith@exeloncorp.com; David.Gullott@exeloncorp.com
Subject:
Byron Unit 2 SG Inspection Results Attachments:
IR 1268131.pdf Mike, As we discussed, included below is a description of the Byron Unit 2 SG inspection results. Attached to this email is IR 1268131 providing additional information.
The Byron Unit 2 steam generator (SG) inspection results are as expected with no unusual or new degradation mechanisms. During eddy current of the 2B SG hot leg, indication of dents (low level were detected in the 2B SG. No degradation or loose parts have been associated with this new denting.
Approximately 50 tubes in the 2B SG contain new small dents (2-5 volts) near the bottom edge of the 3rd baffle plate on the cold leg side. There appears to be a symmetrical pattern of tubes affected that stretches from one side of the baffle plate to the other side. A database historical review suggests that these are new dents that were not present in past inspections.
Exelon is currently performing investigations to determine the cause, evaluating the data, and determining what additional inspections may be necessary to assess the condition.
Please let me know if the staff requests a conference call to discuss these findings.
Thank you, Lisa Exelon Nuclear - Corporate Licensing 630-657-2815 lisa.schofield@exeloncorp.com
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Hearing Identifier:
NRR_PMDA Email Number:
173 Mail Envelope Properties (B89765C774C10B4992D8F5806597A58A5B4651)
Subject:
Byron Unit 2 SG Inspection Results Sent Date:
9/26/2011 2:46:38 PM Received Date:
9/26/2011 2:46:48 PM From:
Lisa.Schofield@exeloncorp.com Created By:
Lisa.Schofield@exeloncorp.com Recipients:
"DiFrancesco, Nicholas" <Nicholas.DiFrancesco@nrc.gov>
Tracking Status: None "jay.smith@exeloncorp.com" <jay.smith@exeloncorp.com>
Tracking Status: None "David.Gullott@exeloncorp.com" <David.Gullott@exeloncorp.com>
Tracking Status: None "Mahoney, Michael" <Michael.Mahoney@nrc.gov>
Tracking Status: None Post Office:
cccmsxch13.energy.power.corp Files Size Date & Time MESSAGE 2172 9/26/2011 2:46:48 PM IR 1268131.pdf 16672 Options Priority:
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Normal Expiration Date:
Recipients Received:
Go Back Print l New Search l Home AR Number: 01268131 Linked ARs Aff Fac:
Byron AR Type:
CR Status:
APPROVED Aff Unit:
02 Owed To:
ACAPALL Due Date:
10/26/2011 Aff System:
RC Event Date:
09/26/2011 CR Level/Class:
/
Disc Date:
09/26/2011 How Discovered:
H02 Orig Date:
09/26/2011 Action Request Details
Subject:
LOW LEVEL TUBE DENTING IN THE 2B SG
==
Description:==
Originator: PATRICK M CREEGAN Supv Contacted: G. Contrady Condition
Description:
During eddy current of the 2B SG hot leg, approx. 50 indication of dents (low level) have been documented by Data Management. The location of the dents are all at support plate 03C with the dents being near the bottom edge. No tube wear indications are present with the dents. This will require additional inspections and evaluation prior to mode 4.
Immediate actions taken:
- 1) Reviewed Eddy current data with the Corporate Level III and Westinghouse engineering.
- 2) Informed the Project Team and OCC.
Recommended Actions:
ATI (Program Engineering) to track final evaluation prior to mode 4 and disposition in the B2R16 Condition Monitoring & Operational Assessment.
Operable Basis:
Reportable Basis:
Page 1 of 2 Full Action Request Report 9/26/2011 http://eamgenco.ceco.com/cap/servlet/ReportFullARServlet
Assign #: 01 AR #: 01268131 Aff Fac:
Byron Assign Type:
TRKG Status:
AWAIT/C Priority:
Assigned To:
Due Date:
10/01/2011 Schedule Ref:
Prim Grp:
ACAPALL Orig Due Date:
Unit Condition:
Sec Grp:
Assignment Details Subject/Description: LOW LEVEL TUBE DENTING IN THE 2B SG Assignment Completion In Progress Notes:
Completion Notes:
Page 2 of 2 Full Action Request Report 9/26/2011 http://eamgenco.ceco.com/cap/servlet/ReportFullARServlet