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Discharge Monitoring Rept for Pilgrim Nuclear Power Station for Apr 1998
	ML20247M683
Person / Time
Site:	Pilgrim
Issue date:	04/30/1998
From:	Desmond N, Goddard C; BOSTON EDISON CO.
To:	; ENVIRONMENTAL PROTECTION AGENCY, MASSACHUSETTS, COMMONWEALTH OF
References
	5.98.052, NUDOCS 9805260333
	Download: ML20247M683 (14)
	v • d • e

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May 18, 1998 BEr.o Ltr. 5.98.052 l

Planning and Administration (SPA)

U.S. Environmental Protection Agency P.O. Box 8127 Boston, MA 02114-8127 Massachusetts Dept. of Environmental Protection 20 Riverside Drive Lakeville, MA 02347 Discharae Monitorina Report

Dear Sirs:

t Enclosed is the Discharge Monitoring Report for Pilgrim Nuclear Power Station (PNPS),

NPDES permit number MA0003557 (Federal) and number 359 (State).

The period covered by this report is April 1998.

Should you have any questions on this report, please direct them to our Principal Marine Biologist, Mr. Robert Anderson, at (508) 830-7935.

Respectfully, k

Nancy L. Desmond RDMb/radmisc/598052

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Attachments: 1. Summary

2. Discharge Monitoring Report j

cc:

U. S. Nuclear Regulatory Commission Mass. Dept. of Env;ronmental Protection Document Control Desk Office of Watershed Management Washington, DC 20555 627 Main Street

/

{gh Worcester, MA 01608 U. S. Nuclear Regulatory Commission r

l g.e.,00<9 Region i 475 A!!endale Road i

King of Prussia, PA 19406 Senior NRC Resident inspector Pilgrim Nuclear Power Station 1

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ATTACHMENT 1 TO BECo LETTER 5.98.052

SUMMARY

PILGRIM I DISCHARGE MONITORING REPORT-In accordance with the Federal Clean Water Act, as amended (33USC 1251 pt sea: the

" CWA"), and the Massachusetts Clean Water Act, as amended (M.G.L.; Chap. 21, 26-53),

regarding effluent limitations, monitoring requirements and other conditions set forth in the Pilgrim NPDES permit (Federal Permit Number MA0003557, and State Permit Number 359),

Parts I and 11, the following information is submitted for the period April 1998.

1.

Discharae Points Covered in this Report Discharae Point Discharae Identification 001 Condenser Cooling Water 002 Thermal Backwash for Biofouling Control 003 Intake Screen Wash 004,005,006, and 007 Yard Drains (April and September) l 008 Sea Foam Suppression 010 Service Cooling Water 011 Makeup Water and Demineralized Waste Discharge

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11.

Summary and Notes of Discharae Report A.

The flows at points 001 and 010 are calculated from system pump capacity and are equal to the total for all pumps in each system running at full capacity for a 24-hour period. The flow at 011 is measured by noting sump levels before and after discharge.

Flow at point 002 is a conservative figure obtained by calculating flow if backwashing took place for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Flows at points 003 and 008 are calculated from system pump capacity and mean operating time.

B.

The temperatures at points 001 and 002 are measured by resistance temperature detectors (RTD's).

C.

Periodically, total residual chlorine (TRC) concentration in the service cooling water (010) exceeds permit requirements (0.50 ppm daily average TRC and 1.00 ppm daily maximum TRC) prior to mixing with any other stream, primarily because of the number of service water pumps in operation. Chlorine injection levels are lowered as a corrective measure. The dilution provided by the PNPS circulating water flow keeps total residual chlorine concentrations discharged to Cape Cod Bay below the NPDES permit limit of 0.1 ppm.

D.

For stormwater outfalls 004,005,006 and 007, samples are collected by grab sampling. Samples are handled and stored in accordance with 40 CFR 136. No additional inputs to these stormwater outfalls occur downstream of the sampling locations.

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E.

Intake traveling water screens were operated with dechlorination pumps on in April.

F.

No sawdust was applied to seek and seal PNPS condenser leaks in April 1998.

G.

The following boron and sodium nitrite discharges (ppm) occurred in April 1998 from discharge point #001. All discharges were below NPDES permit limits prior to entering Cape Cod Bay.

Date Gallons Concentration Concentration Discharaed Discharaed Before Discharae Discharaed Boron 4/18/98 9,185 1.94 0.0025 4/27/98 8,851

<100.00 0.1290 Sodium Nitrite 4/18/98 9,185 215.0 0.2774 4/27/98 8,851 118.0 0.1523 t

H.

On April 13,1998 the USEPA-Region I was notified (Telecon #4.98.002) of the plan to discharge a PNPS neutralizing water tank with pH (3.5) and possible suspended solids beyond NPDES permit limits. EPA approved this discharge as one or two circulating water system pumps would be operating resulting in a dilution to preclude the possibility of any adverse environmental impact on Cape Cod Bay.

l.

There were 2 neutralizing water tank discharges in April and the monthly average suspended solids of 67.4 ppm exceeded the NPDES permit limit of 30.0 ppm. However, on neither date did the daily maximum suspended solids value exceed the Permit limit of 100 ppm, and no adverse environmental impact on Cape Cod Bay is expected.

J.

Pilgrim Station Marine Ecology Semi-Annual Report No. 51 was sent to the USEPA and the Mass. Department of Environmental Protection (DEP) on April 27,1998, as required by NPDES Permit #MA0003557 (BECo Letter 5.98.036).

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