ML20128F076
| ML20128F076 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 01/27/1993 |
| From: | Sears C NORTHEAST UTILITIES |
| To: | Keeney T CONNECTICUT, STATE OF |
| Shared Package | |
| ML20128F080 | List: |
| References | |
| D06112, D6112, NUDOCS 9302110237 | |
| Download: ML20128F076 (3) | |
Text
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]; e j 'f y MNN EO 1 - i R1 ORD CONNECTICtJT 06141-o270' q
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(203)665-4608; s
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C, FREDERICK SEAnS January 27,'1993' EEESTE MfllR g
Mr. Timothy Keeney, Commissioner Department of Environmental Protection State Office Building 165 Capitol Avenue Hartford, CT 06115
References:
1.
Letter (005211),
C.
F. - Sears to T.
Keeney, Ldated -
January 9, 1992.
- 2. -
Letter (005565), C. _ F. Sears to T. Keeney, -dated May 29, 1992.
3.
Permit (C04876), NPDES Permit CT0003263, Northeast Nuclear Energy Company, dated December 14, 1992
Dear Commissioner Keeney:
Millstone Nuclear Power Station Final Report Feasibility Study of Cooling Water System Alternatives To Reduce Winter Flounder Larval Entrainment at Millstone Unit Nos. 1. 2. and 3-In discussions regarding the renewal of the-_ Millston'e Nuclear Power LStation-(MNPS) NPDES permit, the -DEP _ staff = indicated the need for la - study L to :
investigate cooling water system alternatives : to"reducei the-entrainment-'of winter flounder larvae. _through the MNPSMcondenser cooling-water - systems..
Following the October 8,1991 discussions between Northeast Utilities - Service Company.(NUSCO) and DEP, the DEP sent NUSCO-the following.: concept-foritheL study:
"The proposed study of.the-feasibility of reducing entrainment of L winter
-flounder larvae at Millstone NPS should investigate several-alternatives. The study should review-intake structure alternatives-including screening devices and. physical barriers such as sills, baffles, and curtain walls.
- The study:
should also review cooling system design-alternatives such as recirculating cooling: towers and an ? offshore intake.
Finally, the : study L should t review operational alternatives such as - reduced cooling water flow- (higher Delta T-and Maximum Delta T), '. reduced power ; generation, and. the.. scheduling of'
. maintenance shutdowns.
Eati alternativeJ should be, reviewed with ' regard to
. technological' feasibility, effectiveness, and costs."
As a result,. an engineering project was initiated for this feasibility; study on December 1,.1991,_and a' description of the project was submitted to the DEP 9302110237 93012,
- 090041 h
1 PDR.ADOCK 05000245' h-
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Mr. Timothy Keeney 006112/Page 2 January 27, 1993 on Anuary 9,1992, Reference 1.
As the project developed, a scope of work for the study was prepared and submitted to the DEP on May 29, 1992, Refersace 2.
ifdSCO requested a submittal date of February 1,1993, for the final report.
On December 14, 1992, Reference 3, the DEP, by way of Paragraph 8 of the Renewal NPDES Permit for HNPS, approved the May 29, 1992 scope of study and set January 31, 1993 as the submittal date for the final report.
In approving-the cooling water intake structures, pursuant to "Section 310(b) of the Federal Act," the DEP further requested "that additional evidence based upon actual operating experience of H111 stone Nuclear Power Station, Units 1, 2, and 3 would be desirable in order.o corroborate the Commissioner's findings.
Such data will be generated by the studies to be conducted pursuant. to paragraphs 5 and 8 of this permit."
NUSCO, on behalf of Northeast Nuclear Energy Company (NNECO), pursuant to Paragraph 8 of NPDES Permit CT0003263, Reference 3, hereby submits the report titled " Feasibility Study of Cooling Water System Alternatives to Reduce Winter Flounder Larval Entrainment at Millstone Units 1, 2, and 3."
NUSCO believes that this report responds to the Commissioner's request for additional evidence based on actual operating experience of HNPS, as well as studies of other potential designs for entrainment mitigation.
NVSCO believes there are presently no cooling water alternatives that would measurably increase the winter flounder population and, therefore, the high cost of implementation of any alternative is not warranted.
The projected costs that would be borne by the ratepayers would be totally disproportionate to any ecological benefits gained.
We, therefore, corroborate the Commissioner's findings stated in-Permit-CT0003263 that "the location, design, construction and capacity.of 'the cooling -
water intake structure represents the best available technology for minimizing -
adverse environmental impact from impingement and entrainment pursuant to Section 316(b) of the Federal Act."
Should you have any questions, please. call Mr. Thomas P.
Arcari, NUSCO Generation and Environmental-Licensing, at (203) 665-3713.
Very truly yours, NORTHEAST UTILITIES SERVICE COMPANY As Agent for Northeast Nuclear Energy Company
[ 4 kit b.
C. F. Sears Vice President - Environmental Enclosure cc:
See Page 3
(?
Mr. Timothy Keeneyn t
-D06112/Page 3 January 27, 1993.
ec: 1 r. Charles fredette Lonnecticut Department of Environmental Protection 122 Washington Street-llartford, CT'06106 Mr. Gary Leavitt, P.E.
Connecticut Department of Environmental Protection 122 Washington Street Hartford, CT 06106 Mr. Eric Smith Connecticut Department of Environmental Protection Marine Fisheries Office P.O. Box 714 Old Lyme, CT 06371-Mr. Stanley Modzelesky Executive Assistant-Connecticut Siting Council One Central Park' Plaza New Britain, CT 06501
1 I
NORTHEAST
' L UTILITIES 1
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i l
FEASIBILITY STUDY OF i
i COOLING WATER SYSTEM ALTERNATIVES TO REDUCE WINTER FLOUNDER l
LARVAL ENTRAINMENT l
AT MILLSTONE UNITS 1,2, AND 3
.1
'E iH ts one
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nuclear power station JANUARY 1993 1
NORTHEAST UTILITIES SERVICE COMPANY Berlin, Connecticut i
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