Vermont Yankee VSNAP Presentation February 22, 2011 Mike Romeo Director NSA

1. Vermont Yankee VSNAP Presentation February 22, 2011 Mike Romeo Director NSA

2. Agenda • VY was requested to present • Groundwater monitoring • Tritium testing and extraction • Drinking well water testing status

3. Entergy Focus on Safe Plant Operations • Health and Safety our highest priority • NOdetectable Tritium levels found in drinking water • NO detectable Tritium levels found in Connecticut River • NO public health or safety issues; confirmed by Vermont Department of Health • NO nuclear safety issues • Entergy will NOTjeopardize nuclear, radiological, environmental, or public safety

4. Tritium Background What is Tritium? • An isotope of hydrogen • Occurs naturally and as a by-product of nuclear power operations • When combined with oxygen, it becomes “tritiated water” • US Environmental Protection Agency identifies tritium as among the weakest of radionuclides • Emits very low energy beta particle • Particle does not penetrate skin • Particle does not travel far in air (inches)

5. Voluntary Groundwater Monitoring Initiative • Prior to 2007 there were 31 groundwater monitoring wells on site at VY for various reasons • In 2007 installed 3 new wells (Phase 1) for the groundwater monitoring initiative • In 2010 we accelerated the placement of phase 2 wells onsite. • A total of 62 wells are currently on site. 31 original and 31 monitoring wells for the groundwater monitoring initiative.

6. Site Well Positions Groundwater flow direction

7. Site Well Locations Close-up Groundwater flow direction

8. Groundwater Remediation • Extraction wells were located in order to remove the largest possible amount of tritium • Transport of the extracted groundwater to a licensed disposal facility was performed • Total Volume extracted to date is 320,500 gals • As part of the current extraction process, 13,200 gal is currently on site in the collection tank • 307,300 gal have been shipped offsite

9. Groundwater Remediation • Besides tritium, no other plant generated radionuclides identified in groundwater • Removing water is expected to reduce the overall tritium content in the groundwater

10. Groundwater Extraction • Entergy is committed to continued extraction in an effort to remove more tritiated water • Entergy is also committed to sampling from the COB Well • A modification is in the approval process for implementation on or about Friday Feb 25th.

11. GZ-24 Investigation • On January 17, 2011 VY Chemistry became aware of a positive tritium identification in well GZ-24 • Notifications were promptly made to stakeholders • An investigation team was formed and we are actively seeking to identify the source of the tritium in GZ-24

12. GZ-24 Investigation • GZ-24 is a Sentinel well located near the RadWaste Building. • GZ-24 tested positive on sample obtained December 28 • Team is investigating potential sources • Migration of tritium plume from AOG Pipe Tunnel Leak • Buried lines of interest • Sumps and tanks

13. Site Well Locations Close-up

14. GZ-24 Investigation • Pipelines of Interest • RW-204 Stack Sump Discharge Line • WRW-243-G1 Drain Line from 2nd AOG Delay Pipe • RW-186 Drain Line from Steam Packing Exhaust • RW-176 Drain Line from 1st AOG Delay Pipe • RW-187 Drain Line from Standby Gas Treatment System

15. GZ-24 Investigation • To date, the Stack Sump Discharge Line (RW-204) and 2nd Stage AOG Delay Pipe (WRW-243) Drain Line have been tested and ruled out as sources. • RW-186 line has been tested 2/21 and data is being evaluated • Preparations underway for test of 1st Stage AOG Delay Pipe Drain (RW-176). • Loop Seal Modifications underway • RW-187 Drain Line from Standby Gas Treatment System testing is being planned

16. Summary • Health & Safety always our First Priority • Strong Communications with new Administration • Continued Commitment to Operational Excellence

17. Final review • VY was requested to present • Groundwater monitoring • Tritium testing and extraction • Drinking well water testing status • Panel questions?