ML20138F049

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Submits Details of Planned Performance of Certain Maint Activities Associated W/Mnps Unit 1 Svc Water Sys,As Discussed Via 970218 Telcon
ML20138F049
Person / Time
Site: Millstone Dominion icon.png
Issue date: 03/31/1997
From: Scace S
NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES SERVICE CO.
To: Grier J
CONNECTICUT, STATE OF
References
D10932, SES-97-GN-050, SES-97-GN-50, NUDOCS 9705050248
Download: ML20138F049 (1)


Text

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P.O. Box 270 Hartford, cT 06141-0270 i March 31,1997 (203) 665-5000 l SES-97-GN-050 t D10932

. l Mr. James Grier Supervising Sanitary Engineer Water Management Bureau Department of Environmental Protection 4

79 Elm Street Hartford, CT 06106-5127 Dear Mr. Grier-1 Millstone Station NPDES Permit No.0003263  ;

Use of Emeraency Service Water (ESW) System and Temporary Chlorination erformance of c rtain a nte nce ac ivies associatedIsto w t he Water System. As requested, details of these activities are desenbed below. oin Unit 1 Serv As discussed, NNECO is performing maintenance activities to the Unit 1 service water) system. During these activities (approximately for a one month period) we wi to cool the Turbine Building and Reactor Building heat exchangers.

ESW is sea water taken from the intake structure, through backup service water p During plant shutdown, these backup pumps provide approximately 25% of the flow temporary bypass jumper to prevent biofouling. This water Condenser 'O' outlet water box to the Circulating Water discharge tunnel (DSN # 0 Service Water discharge tunnel (DSN # 001A-5). Both locations are permitte to 0.25 mg/l Free Available Chlorine (FAC).

The use of the ESW system as described in this letter commenced on March 29,199 Should you Sincerely, have any questions, please call Mr. Paul Jacobson at 447-1791 x2335.

NORTHEASTNUCLEAR ENERGY COMPANY 2 S. (cace

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CM Director - Nuclear Engineering Programs cc: M. Harder, CT DEP NRC 9705050248 PDR 970331 e ADOCK 05000245 e-app!!...-