Indian Point Energy CenterGroundwater 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

Algonquin Outfall

Gypsum Plant

5th Street Well

Quarry

Identify Sources of ContaminationIP2 Spent Fuel Pool

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

Tested existing wells on site for radioactivity- Tritium detected in the IP2 transformer yard

Tested off-site wells and water supplies for radioactivity—none detected >BG

Accessible pool wall areas inspected

Pinhole defect was identified and repaired in the Fall of 2007

Identify Sources of Contamination

Leak of IP1 spent fuel pool identified in the 1990’s

Footing drains re-routed to allow for collection and monitoring

Investigation finds ( Spring 2006) some contaminants have bypassed footing drains and are present in GW (Sr-90 identified March 2006)

IP1 Spent Fuel Pool

IP1 spent fuel pools

IP1 containment dome

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.

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.

The principal exposure pathway to man is Hudson River fish ingestion.

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

HydrologyGeo-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 Reduce concentration of contaminants in spent fuel pool by continuing enhanceddemineralization which hasreduced Sr-90 and othernuclides by ~98%

2 Stop Pool LeakageRemove IP1 spent fuel (summer 2008)Drain poolMonitor 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

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Long-term Ground Water Monitoring

Program Elements – Monitoring Wells

Boundary and Riverfront wells Selected wells along affected

areas of the site Frequencies established for

long-term monitoring Quarterly, Semi-annual and

Annual Investigative criteria and

actions defined

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NRC Exit On Groundwater Investigation 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

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.

Entergy has inspected the Unit 2 pool and has fixed all leakage paths identified.

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.

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.

Conclusions No impact to public health or safety from ground water

contamination at Indian Point

No contamination observed in off-site wells or reservoirs

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

Source of leaks have been identified

Remedial actions have been implemented with final actions to be completed by end of 2008