ML20085G344

NPDES Discharge Monitoring Rept for Sept 1991

ML20085G344
Person / Time
Site:	Pilgrim
Issue date:	09/30/1991
From:	Kraft E, Wagner E BOSTON EDISON CO.
To:	ENVIRONMENTAL PROTECTION AGENCY, MASSACHUSETTS, COMMONWEALTH OF
References
BECO-5.91-103, NUDOCS 9110240265
Download: ML20085G344 (9)

Text

{{#Wiki_filter:- l easroN EDISON 26 Deaintree Hin on,te hia Brathtree, Manac hum 118 02184 cY October 16, 1991 <o Noa' in9'nwno DECO 5.91-103 NPDES Program Operations Section (HCP) Environmental Protection Agency P. O. Box B12/ Bosten, MA 02114 Massachusetts Division of Water Pollution Control thkeville Hospital Lakeville, MA 02346 QlSGMGLh1411QRING REPORI

Dear 51rs:

Enclosed 1. the Discharge Monitoring Report for Pilgrim Huclear Power Station (PNPS), NPDES Permit Number HA0003557 (federal) and Number 359 (State). The period covertC by this report is September 1991. H RDMcab/4233 Attachments:

1. Sunmary

2. Discharge Monitoring Report cc: U. S. Wuclear Regulatory Commission Document Control Desk Hashington, DC 20555 U. S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406 Senior NRC Resident Inspector Pilgrit Nuclear Power Station

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ATTACHHENT 1 TO DECO LETTER 5.91 103 SUMKARY t EILGRIH 1_Di$G ARGE HONITOR BG REPOR1 In accordance with the federal Clean Water Act, as amended (33VSC 1251 et its: the "CHA), and the Massachusetts Clean Hator Art, as amended (H.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 II, the following information is submitted for the period September 1991. 1. Discharae_Pqints Covered in this RfEatt Discharae Point D11th nge Identification 001 Condenser Cooling Hater 002 Thermal Backwash for Blofoulicq Contro' 003 Intake Screen Hash 004, 005, 006, and 007 Yard Drains (April and September) 010 Service Cooling Hater 011 Hakeup Hater and Demineralf7er Haste Discharge II, Summary and Notes of Discharae Rtgart 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 point 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 hours. 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). { 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 1RC) 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 PHPS circulating water flow keeps total residual chlorine concentrations discharged to Cape Cod Bay below the NPDES Permit limit of 0.1 ppm. l p >l r e . ~ _, - - _, .w, -. ~ - - -..,. _ _. -, _ _,.,, -

i i O. Intake travaling water screens were operated with dechlorination pumps operating at all times. E. Sawdust wi.s applied to seek and seal PNPS condenser leaks on September 7, 1991 (80 pounds). F. The following boron and sodium nitrite discharges (ppm) occurred in September 1991 from discharge point #001. All discliarges were below NPDES Permit 'imits prior to entering Cape Cod Bay. Gallons Concentration Concentration Date D11thund Etfore Discharat E11Chititd Boron 9/14/91 10,855 8.59 0.003 9/30/91 12,859 0.51 (0.001 Sodium Nitrite 9/14/01 10,855 <20.0 <0.026 9/30/91 12,859 <20.0 <0.026 G. The following measurements were made in September 1991 for stormwater yard drain Discharge Points 004, 005, 006 and 007. Suspended Oil & Grease DaltLg Ditt Solids (ma/1) (mall) pl115U1 004 9/25/91 0.5 6.7 5.9 005 9/09/91 13.4 14.2 6.4 006 9/09/91 11.8 119.8 4.8 007 9/09/91 72.3 28.7 6.1 NOTE:. The low pH values at Drain #'s 004 and 006 may be explained by a low natural rainwater event pH of 4.8. High oil and grease measurements at Drain #'s 006 and 007 are currently being investigateo as to their cause, with additional confirmation samplings possible. [ b + i r ,-,,n ..g4 +,,e

ATTAC3HENT 210 DECO LE11ER 5.91-103 DISCHARGE HONITORING REPORT

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