ML051520192
| ML051520192 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 03/31/2005 |
| From: | Jaffe D NRC/NRR/DLPM/LPD4 |
| To: | Sheppard J South Texas |
| Jaffe D, NRR/DLPM, 415-1439 | |
| References | |
| TAC MA7578, TAC MA7579 | |
| Download: ML051520192 (31) | |
Text
David Jaffe - Agenda 3-31.doc Page 1 l David Jaffe - Agenda 3.31.doc Page 1 I STP7159A MEETING AGENDA Group/Meeting Name:
NRC Phone Call on IRE12 SG Inspections Leader:
Facilitator:
Recorder:
Steve Thomas Scott Head John Conly Meeting Location:
MOF N201 Thursday. March 31. 2005 2:00 pm
Purpose:
NRC Phone Call on IREI2 SG Inspections Desired Outcome:
- 2. Provide NRC inspection results for SG ID and plans for primary side inspection
- 3. Provide NRC schedule information
- 4. Establish time frame for any future communications AGENDA WHAT
~HOwNVWHO WHEN (content)
(process)
(minutes)
Introduce participants Statement S. Head 2 min Discuss desired outcomes and agenda Discussion S. Head 3 min Present information for SG 1A, SGIB, SG IC Discussion S. Thomas 10 min Present information for SG ID Discussion S. Thomas 20 min Discuss schedule information Discussion D. Rencurrel 2 min Discuss future communications Discussion S. Head 2 min
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South Texas Project 1RE12 Steam Generator Secondary Inspection Results
SIG History e S/G replacement
- Unit 1
- Unit 2 May 2000 Dec 2002 o Completed three operating cycles in Unit 1 since S/G replacement e Currently in second operating cycle for Unit 2 since S/Greplacement 2
1IREI 2 Planned SiG Work Scope a Normal S/G Management Program Scope
- Sludge lancing all four steam generators
- Post-lancing Foreign Object Search and Retrieval (FOSAR) all four steam generators
- No primary tube inspections (scheduled for 1 RE1 3)
- S/G 1 D feedring end cap removal, inspection, and FOSAR 3
SiG inspection Results m Small quantities of stainless steel Flexitallic spiral wound gasket material found in S/G's 1A, 1B, and 1C v Numerous feedwater heater (FWH) stabilizing cable wire fragments found in S/G 1D 4
SIG's IA, IB, and IC Results o Pieces of Flexitallic gasket material were found (photos 1-5) e Several pieces were located in peripheral locations in the tube bundle a All identified gasket pieces were successfully retrieved, except for one piece which crumbled when grabbed 5
- Post-retrieval video examination of the affected tubes did not identify any tube wear o Additional inspections The end caps of the feedrings for S/G's 1A, 1 B, and 1 C were removed to facilitate inspection and FOSAR A second video inspection of the tube bundle periphery is planned 6
Cause, Extent, Corrective Action
- Specific source of gasket material not identified
- Gasket damage occurs during installation and degradation soon after return to service
- Introduction of material is not believed to be an ongoing, age-related process
- Non-contained gaskets will be replaced with CGI-style when reworked
- Potential sources scheduled for 1 RE1 2 reworked with CGI-style gaskets
- Processes will be changed for future work 7
SIG ID Background S During 1 RE1 1 shutdown, feedwater (FW) regulating valve 1 D did not fully close o FWH tube stabilizing cable was found wrapped around the valve cage (photo 6) a Some pieces of cable missing due to closing the valve
- A single tube plug was discovered missing from FWH 1 1A outlet side o S/G 1 D only S/G affected 8
SIG ID Background (cont'd)
& Plug was recovered a Wire fragments were recovered from S/G 1 D feedring spray cans and sludge collector (photos 7-8)
- Potential fragments which may have entered S/G 1 D were determined to be bounded by an existing wear analysis 9
SIG ID Work Scope for IREI2 o Perform previously scheduled sludge lancing e Perform internal bundle inspections and FOSAR a Remove feedring end cap, inspect and clean 10
SIG ID Results f Pre-lancing video inspection revealed multiple wire fragments (photo 9)
- Repeated sludge lancing effectively moved most material to the annulus to facilitate removal (photo 10)
C In-bundle inspection results 11
SIG I D Results (cont'd) a Post-lancing video examination identified wear on hot leg tube C22 R86 (photos 11-12) o In accordance with decision tree based on established industry guidance, primary-side inspections are required 12
SIG I D Additional Work Scope o Primary NDE inspection
+Point 100% 5 tubes deep in peripheral region plus 20% buffer zone 6-1 0 tubes deep
- Full-length bobbin of 20% entire population (1 00% of critical region plus 20% buffer zone) a Comprehensive visual inspection of the tube bundle periphery 13
SIG I D Present Status o Top-of-tubesheet mapping and FOSAR ongoing o Successful location and retrieval of larger pieces e Mobilizing equipment and personnel to support primary-side NDE
- Feedring inspection pending 14
David Jaffe - TEXT.htm Page 1 David Jaffe - TEXT.htm Page 1 l Here's the real one with the attachments. ---- Original Message-----
From: Thomas, Steven Sent: Monday, April 04, 2005 1:00 PM To: 'jlt2@nrc.gov'; 'wdj@nrc.gov'; 'glg@nrc.gov' Cc: McBurnett, Mark; Head, Scott; Harrison, Albon
Subject:
STP Steam Generator 1D NDE Inspection Plan I am attaching the subject tubesheet plans. In words, the scope is: -20% of entire tube population, as planned. The "5 tubes deep' plan has been modified to focus on the critical high velocity areas of interest as follows: +Point 1161 tubes 100% tubes with gap velocities 8.5 fps (at least two tubes deep) 20% tubes with gap velocities 7. 8.5 fps buffer
+Point 702 tubes special interest Bobbin 791 tubes in center area +60 tube buffer/435 tubes at periphery +87 tube buffer Let me know if you have any questions. Steve Thomas At-t-.q nt 3
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