Indian Point Energy Center Groundwater Investigation Don Mayer

Indian Point Energy Center Groundwater Investigation Don Mayer, Director, Special Projects and Unit 1 delivered by S. Sandike, Entergy, Indian Point

Ground Water Investigation Overview Identify Source(s) of Contamination Assess Impact of Leaks Develop Hydrological Model of Site Calculate Potential Dose to Public Develop Remediation Strategy Conclusions

Indian Point Looking South Along the Hudson River 5 th Street Well Quarry Gypsu m Plant Algonqu in Outfall

Identify Sources of Contamination IP 2 Spent Fuel Pool l l Hairline concrete shrinkage cracks identified in Fuel Storage Building wall during 2005 excavation for new gantry crane Water collected determined to be of fuel pool origin l Tested existing wells on site for radioactivity- Tritium detected in the IP 2 transformer yard l Tested off-site wells and water supplies for radioactivity—none detected >BG l Accessible pool wall areas inspected l Pinhole defect was identified and repaired in the Fall of 2007

Identify Sources of Contamination IP 1 Spent Fuel Pool l Leak of IP 1 spent fuel pool identified in the 1990’s l Footing drains re-routed to allow for collection and monitoring l Investigation finds ( Spring 2006) some contaminants have bypassed footing drains and are present in GW (Sr-90 identified March 2006) IP 1 containment dome IP 1 spent fuel pools

Major Conclusions of the Study Public Health and Safety After two years of testing and investigation, we have concluded that there is no impact to public health and safety or the environment. l l No evidence of offsite contaminants attributable to Indian Point have been observed in surrounding environmental media. This has been confirmed by the independent split sampling and analysis by USNRC and NYSDEC. l The principal exposure pathway to man is Hudson River fish ingestion. l No radionuclides have been detected above background in HR fish samples, most recently via a split sampling program by Entergy the NRC and DEC (Hudson River fish study).

Major Conclusions of the Study Hydrology Geo-hydrological modeling and well testing, both onsite and offsite, show that groundwater is not migrating to offsite properties. Flow is westward toward and into the Hudson River.

Remediation Strategy Unit 1 1 2 Reduce concentration of contaminants in spent fuel pool by continuing enhanced demineralization which has reduced Sr-90 and other nuclides by ~98% Stop Pool Leakage Remove IP 1 spent fuel (summer 2008) Drain pool Monitor concentrations (via long-term monitoring plan)

Remediation Strategy Unit 2 1. Spent fuel pool liner leak from early 1990’s was repaired and verified as sound in 2006 2. Leakage from shrinkage crack identified in 2005 has been contained in collection system 3. Pinhole leak in spent fuel pool transfer liner has been repaired (December 2007) 4. Implement Long Term Monitoring plan of site’s groundwater to assess natural attenuation of plumes and provide early detection of potential new leakage

Long-term Ground Water Monitoring Program Elements – Monitoring Wells l l Boundary and Riverfront wells Selected wells along affected areas of the site Frequencies established for longterm monitoring l Quarterly, Semi-annual and Annual Investigative criteria and actions defined 10

NRC Exit On Groundwater Investigation l l NRC issued a stand alone inspection report on May 13 that documented NRC’s review of this issue over the past 2½ years. NRC held an exit meeting with the public on May 20 l l No significant findings or violations. One minor violation because in 2006 Entergy did not have a plan developed to take back up samples to verify the quality of our laboratories. This has since been corrected. l Entergy has inspected the Unit 2 pool and has fixed all leakage paths identified. l Entergy will remove the fuel from the Unit 1 pool this summer and will then drain down the Unit 1 pool, thereby stopping the leak from the Unit 1 pool by years end. l The removal of the fuel from Unit 1 is a major commitment on Entergy’s part to stop the Unit 1 pool leakage to the site groundwater. 11

Conclusions l No impact to public health or safety from ground water contamination at Indian Point l No contamination observed in off-site wells or reservoirs l Calculated doses are less than 1% of regulatory limits, and no actual contaminants attributable to the plant have been detected in the Hudson River water or fish l Source of leaks have been identified l Remedial actions have been implemented with final actions to be completed by end of 2008