ML19259D511

Nonroutine 30-Day Environ Rept 75-02:for Period 750606-28, Downstream River Water Samples Showed Tritium Content Four Times Control Station Value.Caused by Schedule Change of Grab Samples During Period of Condensate Tank Discharges

ML19259D511
Person / Time
Site:	Three Mile Island
Issue date:	08/18/1975
From:	METROPOLITAN EDISON CO.
To:
Shared Package
ML19259D510	List: ML19259D509 ML19259D511
References
75-02, 75-2, NUDOCS 7910240775
Download: ML19259D511 (1)

Text

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ETCLOSUPI Metropolitan Edison Company Three Mile Island Nuclear Station Unit (TMI-1)

Docket No. 50-289 Operating License No. DPR-50 Honroutine 30-Day Environmental Report 75-02 Report on an Anomalous Measured Level of Radioactivity Description of Measured Level A monthly composite of veekly grab sa ples of surface river water collected about 1.5 miles downsti:eam frem the TMI-1 river discharge had a total tritium activity of 2.31 x 10-b pCi/cc as reported to Met-Ed on July 2h, 1975 This value is greater chan four times the control station value of 2 5 x 10-7 pCi/ce, which was determined by Met-Ed's consultants during the station preoperation period. The next river water sample analyzed from the sate station lochtien shoved that the tritium level was nor=al.

Possible Cause Discharges are made from the TMI-1 Liquid Waste Evaporator Condensate TarR3 on an irregulet schedule based on unit operating conditions. Weekly grab sa=ples-for the radiological environ = ental monitoring program are taken on a regular basis. It is believed that the grab samples which vere composited to form this sample vere taken during periods of evaporator condensate tank discharge and, accordingly, during periods of higher-than-normal river water tritium level.

Analysis of Measured Level It is belived that neither the health nor safety of the public was threatened by the occurrence represented by this sample in that:

a. The level of tritium activity was less than 1/1000th of the Maxinum Per=issible Concentration Level given in 10CFR20 for members of the public.

b. The level of tritium activity at the nearest downtream source of continuous public use was a background level (1.86 x 10-7 uCi/ce).

c. No Technical Specification limits were exceeded.

d. The event resulted frc: normal unit operations as described in the TMI-1 Final Safety Analysis Report.

Corrective Actions The discharge of effluents from the Evaporator Condensate Tank is a normal process associated with unit operations and is described in the Final Safety Analysis Report, and therefore, no corrective action vill be taken.

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