ML20215H419

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Forwards NPDES Rept & Addl Data for Facility for Mar 1987. on 870304,sewage Treatment Plant Effluent Exceeded Suspended Solids Daily Pounds Released Limit.Caused by Excessive Sewage Flow Due to Heavy Rainfall
ML20215H419
Person / Time
Site: Trojan File:Portland General Electric icon.png
Issue date: 04/13/1987
From: Hess R
PORTLAND GENERAL ELECTRIC CO.
To:
OREGON, STATE OF
Shared Package
ML20215H422 List:
References
ES-694-87L, NUDOCS 8704200308
Download: ML20215H419 (2)


Text

h- 50-344 PbrtlandGeneralElectricCcmv any April 13, 1987 ES-694-87L Trojan GOV REL 9C Oregon Department Environmental Quality Northwest Region Executive Building 811 SW Sixth Ave Portland OR 97204 Gentlemen:

Attached is the NPDES report for the Trojan Nuclear Plant for March 1987. Also attached are data required to be submitted in addition to that on standard NPDES forms.

The plant maintained power operation during the month.

The Sewage Treatment Plant effluent suspended solids daily pounds released limit (6.3 pounds) was exceeded on March 4 with a total of 13.4 pounds released. This high release value also raised the monthly average pounds released to 4.7 pounds per day, with a limit of 4.2 pounds per day. The out-of-specificatilon suspended solids value on March 4 was caused by excessive Sewage Plant flow due to very heavy rainfall and inleakage into the Sewage System.

Sewage Plant flow was reported as 62,000 gallons per day on March 4 with a plant design capacity of 25,000 gallons per day.

Average reported flow for the month was 34,000 gallons per day.

These reported flow values may have an error factor due to the method used to determine flows, but visual observation indicated flow beyond plant capacity during periods of heavy rainfall.

Nuclear Plant Engineering has been advised to budget for sewer line inspections and repair in 1988 to reduce the water inleakage into the sewage System.

In order to lessen the load on the sewage treatment plant during the current refueling and maintenance shutdown (when a much larger work force is on site), 20 portable sanitary units and two wash trailers with holding tanks have been brought on site.

8704200308 870413 PDR ADOCK 05000344 R pop 1

i 121 S.W Sa: mon Street. Por::and. Oregon 97204

NPDES Report April 13, 1987 Page 2 The main outfall pH monitor was placed back in service on March 6 after being out of service since February 13. Instrument and Control personnel spent considerable time trouble shooting and rebuilding the monitor to correct the drifting problem that was experienced. The monitor would calibrate properly with buffer standards, but would drift to greater than 1 pH unit off when placed in service. The problem was found to be excessive moisture in the pH probe assembly.

The main outfall pH monitor was out of service from 0515 hours0.00596 days <br />0.143 hours <br />8.515212e-4 weeks <br />1.959575e-4 months <br /> on March 10 to 1550 hours0.0179 days <br />0.431 hours <br />0.00256 weeks <br />5.89775e-4 months <br /> on March 12 to repair the check value in the sample line. This monitor was again out of service from 2250 hours0.026 days <br />0.625 hours <br />0.00372 weeks <br />8.56125e-4 months <br /> on March 29 to 1115 hours0.0129 days <br />0.31 hours <br />0.00184 weeks <br />4.242575e-4 months <br /> on March 31 to dry the electronics and recalibrate the unit.

The main outfall temperature indicator was out of service from 0330 hours0.00382 days <br />0.0917 hours <br />5.456349e-4 weeks <br />1.25565e-4 months <br /> on March 16 to 1255 hours0.0145 days <br />0.349 hours <br />0.00208 weeks <br />4.775275e-4 months <br /> on March 21 to correct a problem which caused erratic temperature readings.

The main outfall BTU indicator was out of service from 2244 hours0.026 days <br />0.623 hours <br />0.00371 weeks <br />8.53842e-4 months <br /> on March 27 to 0545 hours0.00631 days <br />0.151 hours <br />9.011243e-4 weeks <br />2.073725e-4 months <br /> on March 28 for recalibration.

During the periods of outages all required back-up samples were taken.

If you have questions, please contact Stan Katkansky at 226-8409.

Sincerely, N

R. J. Hess, Manager Environmental Sciences RJH:SCK: sic Attachment c: David Kish, DOE Trojan Distribution

! NRC Distribution es 1014 l

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