ML20005A877

Ro:On 810219 Analytical Results of Aquatic Vegetation Samples Collected on 810210 Indicated That Radioactivity Levels Exceeded Tech Specs.Cause Not Stated

ML20005A877
Person / Time
Site:	Oconee
Issue date:	02/25/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
NUDOCS 8107010423
Download: ML20005A877 (2)

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@ l;Q^K Mr. James P. O'Reilly, Director M

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U. S. Nuclear Regulatory Con:nission  %

Region II E =Ib y ygg g g jggj . L 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 p- ,

g com.im.au Re: Oconee Nuclear Station G ,U Docket Nos. 50-269, -270, -287 ') ND

Dear Mr. O'Reilly:

In accordance with requirements of Oconee Nuclear Station Technical Specification 6.6.2.2.c, this report is submitted describing a condition in which measured radioactivity levels exceeded the control level by greater than 50 times.

On February 19, 1981, analytical results of aquatic vegetation samples collected on February 1Q, 1981 were reviewed. A summary of pertinent analytical results is given below: ,

Sample Loca:1on Activity pCi/kg (vet Co-58 Co-60 Cs-134 Cs-137 000.5 Lake Keowee <80.02 El <5.18 El <5.06 El 7.94 El (Control) 4.6 El 000.4 Near Liquid 6.31 E3 4.19 E3 2.96 E3 7.09 E3 Effluent Release 8.3 El t8.7 El 7.4 El 9.5 El The expected activities calculated, using the bicaccumulation factors given on page 131 of the Final Environmental Statement for Oconee Nuclear Station, are given below for aquatic vegetation near the liquid effluent release point.

Radionuclide Measured Activity (pCi/kg), Expected Activity (pCi/kg)

Co-58 6.31 E3 1.57 E3 Co-60 4.18 E3 2.58 E2 Ce-134 2.96 E3 1.66 E4 Cs-137 7.09 E3 3.35 E4 A comparison of the expected and measured aquatic vegetation activities at Location 000.4 shows Co-58 to be close to expected activity while Cs-134 and Cs-137 are well below the expected activities. The measured Co-58 activity implies that the bioaccumulation for cobalt may have been larger in this case than generally assumed in the Final Environmental Statement. Wide rangas of bioaccumulation factors have been observed depending on the type of vegetation and existing environmental conditions.

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Mr. James P. O'Reilly, Director Page 2 February 25, 1981 l'

Since these activities are consistent with taa expected activities, they do not present any significant impact on public health and safety.

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V y truly yours, '

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WilliamO. Parker,Jrd JLJ:pw i

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