ML20113G002

Nonroutine Radiological Environ Operating 10-Day Rept

ML20113G002
Person / Time
Site:	Nine Mile Point
Issue date:	01/10/1985
From:	Lempges T NIAGARA MOHAWK POWER CORP.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NMP-10304, NUDOCS 8501240206
Download: ML20113G002 (3)

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NONROUTINE' RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT -

- . Nine Mile Point Nuclear Station Unit 1

• Docket No. 50-220 January 10, 1985 LINTRODUCTION

'This Nonroutine Radiological Environmental' Operating Report is submitted in accordance with Section 4.6.2.b of the Nine-Mile Point Nuclear Station Unit 1 Technical Specifications, Appendix B (Environmental Technical Specifications). Section

4.6.2.b indicates that "if a confirmed measured level of radio-activity in any' environmental medium exceeds ten times the control value, a written report shall be submitted."

. DESCRIPTION Samples of shoreline sediment were collected and. analyzed in accordance with Appendix B' specification 3.2.a and Table 3.2-1.

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The samples in question were collected on October 23, 1984. The

. indicator sample showed-a concentration of Cs-137 in excess of ten times the applicable control sampic value for the same radionuclide.

The control sample value was an LLD value.

CAUSE The presence of Cs-137 in shoreline sediment is, for the most part, a result of past liquid effluent ' discharges at the site. .All liquid effluent discharges at the site were'well within Technical Specification limits during 1984 and previous to 1984.

CORRECTIVE ACTION (S)_

No corrective action is anticipated for.the following reasons:

1. Site liquid effluent discharges are and have been well within Technical Specification limits.

2. The shoreline area, where the sediment samples were obtained, is controlled by Niagara Mohawk security personnel in the-sense that members of the public found on the shoreline area are escorted off. Therefore, the ' dose consequences, as .de--

lineated.below, are minimal. _

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. IMPACT

' The impact: on members of the_ public,(with respect to a Cs-137

- . concentration' greater than. ten' times the control result in

-shoreline sediment,.is-minimal. For purposes of conservative illustration, however, the dose _ consequences could be' evaluated byLassuming that the shoreline area at Nine Mile Point is a beach area for public recreation. Using standard Regulatory Guide 1.109 methodology, the maximum exposed individual (teenager)'.

'would receive a whole body dose of 0.005 mrem per year and.a

~s kin' dose of.0.006 mrem per year. Standard Regulatory-Guide--1.109 methodology assumes an exposure time of 67 hours7.75463e-4 days <br />0.0186 hours <br />1.107804e-4 weeks <br />2.54935e-5 months <br /> per year, a

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sediment mass of 40 Kg/m2 dry (to a depth of 2.5 cm),. a shore width factor of 0.3, a Cs-137 concentration of -1.54 0.15

pCi/g - dry weight, and no radiological decay.

The illustrative whole body and skin-doses calculated above can be compared to the same doses received'from Cs-137 in soil samples.

_ Soil samples were collected'at indicator locations and at a control location during 1983 as required.by the Technical" Specifications.

The soil sample from the' control location contained a Cs-137 concen-tration of 1.46 1 0.15 pCi/g - dry.' The detected Cs-137 in this sample is a result of past. weapons testing. The associated whole body and skin doses received from Cs-137 in soil at this location, using the same assumptions above and Regulatory Guide -1.109. method-ology, are 0.017 and 0.019 mrem per year, respectively. A shoreline width factor in this calculation is not applicable. These doses are greater than three times'the whole body and skin doses received from Cs-137 in the shoreline sediment at'the NMP-1 location.

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A summary of this reportable occurrence will also appear in the

'1984 Annual Environmental Operating Report.-

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, ~- , NMP 10304 NIAGARA MOHAWK POWER CORPORATION NIAGARA . MOHAWK 300 ERIE BOULEVARD. WEST SYRACUSE.N.Y.13202 January 10, 1985 Dr. Thomas E. Muricy.

Regional AdministAator United States Nuclear Regulatory Commission Reghn I -

631 Park Avenue King of Prussia, Pennsytvania 19406 Re: Docket No. 50-220

Dear Dr. Murtey,

in accordance icith Nine Mile Point Nuclear Station Untt 1 Technical Specifications, we hereby submit the follotaing 10 day Norvtoutine Radio-Logical Environmental Operating Repor.t. Tids report is submitted in ,

accordance with the required content of sec. tion 4.6.2 of the Appendix B Teclutical Specifications.

Very truiy yours, A

Thomas E, Lempges Vice President Nuclear Generation TEL/HJF/Lo cc: Director, Office of NRR (l copy)

T.J. PeAkins T.W. Roman E.W. Leach H.J. Fianagan Enclosure