ML082530274
| ML082530274 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 07/23/2008 |
| From: | Entergy Nuclear Operations, Vermont Yankee |
| To: | NRC/SECY/RAS |
| SECY RAS | |
| References | |
| 06-849-03-LR, 50-271-LR, Entergy-Applicant-E4-04-VY, RAS M-319 | |
| Download: ML082530274 (2) | |
Text
Do0Ckt Wb. 50 2 V ff icial Exhibit 0.V NRC Staff Other_______
WENTIMll on (wbwa AdIo Taken:
REJEQ1!D WMID0AWN DOCKETED USNRC August 12, 2008 (11:00am)
OFFICE OF SECRETARY Vermont Ya nPý AFF License Renewal Application Technical Information B.1.13 FLOW-ACCELERATED CORROSION Proaram Description The Flow-Accelerated Corrosion (FAG) Program at VYNPS is comparable to the program described in NUREG-1801,Section XI.M17, Flow-Accelerated Corrosion.
This program applies to safety-related and nonsafety-related carbon steel components carrying two-phase or single-phase high-energy fluid > 2% of plant operating time.
The program, based on EPRI Report NSAC-202L-R2 recommendations for an effective flow-accelerated corrosion program, predicts, detects, and monitors FAC in plant piping and other pressure retaining components. This program includes (a) an evaluation to determine critical locations, (b) initial operational inspections to determine the extent of thinning at these locations, and (c) follow-up inspections to confirm predictions, or repair or replace components as necessary.
NUREG-1801 Consistency The Flow-Accelerated Corrosion Program at VYNPS is consistent with the program described in NUREG-1801,Section XI.M17, Flow-Accelerated Corrosion.
Exceptions to NUREG-1801 None Enhancements None Operating Experience Recent inspection results (RFO 23) revealed that repairs or replacements were not necessary.
Turbine cross-around piping inspections found that 1995 repairs mitigated the rate of erosion and that wall thickness is acceptable. Absence of loss of material due to flow-accelerated corrosion provides evidence that the program is effective for managing loss of material for carbon steel lines containing high-energy fluids. Also, past repairs, replacements, and modifications have been effective in mitigating FAC.
QA surveillances and self-assessments from 1999 to 2004 revealed no issues or findings that could impact effectiveness of the program.
Appendix B Aging Management Programs and Activities Page B-47
~&42&LA~-
Vermont Yankee Nuclear Power Station License Renewal Application Technical Information Conclusion The Flow-Accelerated Corrosion Program has been effective at managing aging effects. The program has been improved through implementation of lessons learned from operating experience. The Flow-Accelerated Corrosion Program provides reasonable assurance that effects of aging will be managed such that applicable components will continue to perform their intended functions consistent with the current licensing basis for the period of extended operation.
Appendix B Aging Management Programs and Activities Page B-48