m) from the cuts. Even in Jordan Cove, the area 

 most likely to be affected by the thermal effluent, 

 there were respites from elevated temperatures. 

 As temperature records are obtained from 

 thermistors deployed at strategic times and places, 

 our understanding of the highly dynamic thermal 

 plume will be enhanced. 



Summary 



1 . The configuration and extent of the thermal 

 plume produced during three-unit operation, 

 as measured by dye concentration, generally 

 matched predictions during all four tidal re- 

 gimes. 



2. Based on dye concentrations at Unit 1, very 

 little recirculation of discharge water occurs. 



3. Water temperatures recorded continuously at 

 selected locations were also generally what 

 was expected, based on predictions. 



4. The plume is highly dynamic and those re- 

 gions influenced by increased water 

 tempeatures generally experienced a respite 

 from wann water for at least several hours 

 during a tidal cycle. 



5. Based on both the survey and supplemental 

 temperature data, at no time during the pe- 

 riod studied did the 4°F (2.2°C) isotherm 

 appear to extend past the 8,000-ft (2439 m) 

 limit imposed by the NPDES permit. 



References Cited 



Liang, H.C., and Tsai, C.E. 1979. Far-field 

 thermal plume prediction for Units 1, 2 and 3, 

 Millstone Nuclear Power Station. NERM-49, 

 Stone and Webster Engineering Corp., Boston, 

 MA. 



Millstone Point Company (MPC). 1972a. Mill- 

 stone Nuclear Power Station Unit 2 

 Environmental Report, operating license stage. 



MPC. 1972b. Millstone Nuclear Power Station 

 Unit 3 Environmental Report, construction 

 permit stage. Vol. 1 and 2. 



NUSCO. 1979. Millstone Point Units 1 and 2 

 Hydrothermal Survey Report, July 25 - August 

 2, 1977. Submitted to NRC. 



. 1983. Millstone Nuclear Power Station 



Unit 3 Environmental Report. Operating Li- 

 cense Stage. Vol 1-4. 



. 1986. Proposed ecological studies Mill- 

 stone Nuclear Power Station, 1987. Letter to 

 Connecticut Department of Envirormiental 

 Protection. 



OSI (Ocean Surveys, Inc.). 1987. Final report, 

 hydrothermal survey Millstone Nuclear Power 

 Station, Waterford, CT. Ocean Surveys, Inc., 

 Old Saybrook, CT. 



Pritchard-Carpenter, Consultants. 1967. Contin- 

 uous discharge tracer study Twotree Island 

 Channel and Niantic Bay, lx>ng Island Sound. 

 Report to Millstone Point Company. 



Braincon Corporation. 1975. Hydrographic Sur- 

 veys, August-September 1973 and February 

 1974. Report to Northeast Utilities Service 

 Company. 



ENDECo (Environmental Devices Corporation). 

 1977. Postoperational Units 1 and 2, 

 preoperational Unit 3 hydrothermal survey of 

 the Millstone Nuclear Power Station. Report 

 to Northeast Utilities Service Company. 



. 1970. Tracer study of the circulating 



water system, Millstone Point Unit number 

 one. Report to Millstone Point Company. 



Raytheon Marine Research Laboratory. 1968. 

 Millstone survey, August 29, 1968. Report to 

 Millstone Point Company. 



. 1969. Millstone survey, March 20, 1969. 



Report to Millstone Point Company. 



346 



