ML20044F176

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NPDES Discharge Monitoring Rept for Apr 1993 for Pilgrim Nuclear Power Station
ML20044F176
Person / Time
Site: Pilgrim
Issue date: 04/30/1993
From: Rothert W, Schmelling L
BOSTON EDISON CO.
To:
MASSACHUSETTS, COMMONWEALTH OF
References
BECO-5.93.063, NUDOCS 9305270146
Download: ML20044F176 (10)


Text

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Ej BOSTON EDISON 25 Brarntree Hill Park Braintree, Massachusetts 02184 May 18, 1993 W. C. Rothert General Manager Technical BECo 5.93.063 NPDES Program Operations Section (WCP)

Environmental Protection Agency P.O. Box 8127

_l Boston, MA 02114 Massachusetts Division of Water Pollution Control Lakeville Hospital Lakeville, MA 02346 Discharae Monitorino Report I

Dear Sirs:

i 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 1993.

a W. C. Rot ert P.9A/DMR/nas i

Attachments:

1. Summary
2. Discharge Monitoring Report cc:

U. S. Nuclear Regulatory Commission [

Document Control Desk Washington, DC 20555 l

U. S. Nuclear Regulatory Commission Region I l

475 Allendale Road King of Prussia, PA 19406 l

Senior NRC Resident Inspector Pilgrim Nuclear Power Statian 9305270146 930430 DR ADOCK 05000293 PDR g

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ATTACHMENT 1 TO BECo LETTER 5.93 063 s,

SUMMARY

t PILGRIM I DISCHARGE MONITORING REPORT i'

In accordance with the Federal Clean Water Act, as amended (33USC 1251 gt 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 l

conditions set forth in the Pilgrim NPDES Permit (Federal Permit Number

-MA0003557, and State Permit Number 359), parts I and II, the following i

information is submitted for the period April 1993.

I.

Discharoe Points Covered in this Report Discharge Point Discharoe Identification 001 Condenser Cooling Water 002 Thermal Backwash for Biofouling Control i

003 Intake Screen Wash 004, 005, 006, and 007 Yard Drains (April and September)

)

010 Service Cooling Water 011 Makeup Water and Demineralizer Waste Discharge II.

Summary and Notes of Discharoe Report A.

The flow 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 />. Flow at point 003 is 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).

l C.

Periodically, total residual chlorine (TRC) concentration in the I

service cooling water (010) exceeds Permit requirements (0 50 ppm daily average'TRC and 1.00 ppm daily maximum TRC) prior to mixing r

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 j

circulating water flow keeps total residual chlorine concentrations discharged to Cape Cod Bay below the NPDES Permit l

limit of_ 0.1 ppm.

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i D.

For stormwater outfalls 004, 005, 006 and 007, Sigma 800 SL Portable Composite Samplers are utilized.

The samplers are i

equipped with a " liquid level activator" that commences the sampling when the liquid reaches a predetermined level. This assures a sample is taken "within the first hour of the start of a i

significant storm event." The intake and collection assemblies of the samplers conform to U.S. EPA requirements for collecting oil i

and grease samples (USEPA letter to BECo dated 1/7/92).

No additional inputs to these stormwater outfalls occur downstream of i

the composite samplers' sampling locations.

E.

Intake traveling water screens were operated with dechlorination pumps operating at all times, j

i F.

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

April 1993.

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G.

The following boron and sodium nitrite discharges (ppm) occurred in April 1993 from discharge point #001. All discharges'were below NPDES Permit limits prior to entering Cape Cod Bay.

Date Gallons Concentration Concentration I

Discharced Discharced Before Discharoe Discharced Boron 4/05/93 9,853 0.1 0.0001 l

4/11/93 8,350 41.0 0.0500 4/22/93 13,193 18.5 0.0200 l

1 Sodium Nitrite l

4/05/93 9,853

<1.0

<0.0013 4/11/93 8,350

<l.0

<0.0013 2

l 4/22/93 13,193 7.5 0.0100 H.

The following measurements were made in April, 1993 for stormwater yard drain Discharge Points 004, 005, 006 and 007.

Suspended Oil & Grease Drain #

Date Solids (mo/1) mo/l pHfSU)

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004 4/22/93 56.4 2.5 7.3 l

005 4/22/93 144.1 5.3 10.8 l

006 4/22/93 74.9 4.7 7.4 007 4/22/93 91.6

3. l '

7.5 l

Note:

The high suspended solids and pH at Drain #005 may be explained by construction activities in the vicinity. of i

this storm drain.

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I.

By telecon on April 27, 1993 (BECo Telecon 4.93.023) the USEPA approved the discharge of 1.0 ppm or less of boron without a circulating water. system (CWS) pump in operation, if necessary, from discharge point 001 at PNPS. However, whenever possible a CWS pump should be utilized during boron discharge to assure adequate dilution.

J.

Pilgrim Station Marine Ecology Semi-Annual Report No. 41 was sent to the USEPA (Region I) and Mass. Division of Water Pollution Jontrol (DWPC) on April 23, 1993 as required by the NPDES Permit

  1. iA 0003557 (BECo letter 5.93.057).

K.

Approximately 30 cubic yards of sand were removed from the concrete surfaces of the intake structure from March 22.- April 2, 1993.

It was pumped into breakwater crevices above the high tide mark.

The sand removal was necessary to alleviate concern over its effects on normal operation of mechanical components / traveling screens, and it was expected to have no adverse environmental impact. The removal operation was in accordance with Part I, Paragraph A.l.0. of the NPDES Permit.

ATTACHMENT 2 TO BECo LETTER 5.93.063 I

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