ML19254B205

LER 79-051/04T-O:on 790829,activity Level of Mn-54 Onsite More than 10 Times Control Location (Offsite) for Same Period.Caused by High Bioaccumulation Factor of Manganese in Fresh Water Mollusks Used in Sample

ML19254B205
Person / Time
Site:	FitzPatrick
Issue date:	09/19/1979
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19254B201	List: ML19254B199 ML19254B205
References
LER-79-051-04T, LER-79-51-4T, NUDOCS 7909240566
Download: ML19254B205 (3)

Text

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NAME OF PREPARER PHONE:

POWER AtTri10RITY OF TiiE STATE OF NEW YORK JAMES A. FITZPATRICK NUCLEAR POWER PLANT DOCK i NO. 50-333 ATTACll5E!U' TO LER 79-051/04T-0 Page 1 of 2 The following Environmental Radiological Monitoring sample is an anomalous measurement based on the criteria outlined in Section 5.6.2.B of the James A.

FitzPatrick Environmental Technical Specifications (ETS).

FOLLUSK SAMPLES Sample Location

• Date b5-54 PCi/g (wet)

1. O ff-Site 5/30/79 < 0.034

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NLPW On-Site 5/30/79 0.077 f,0.026

[z(frck 6/11/79 0.53 + 0.059

4. FitzPatrick (Recount)

On-Site 6/11/79 0.46 + 0.055

• See Technical Specification, Appendix B for location details.

The activity IcVel of hh-54 in the FitzPatrick (on-site) is greater than ten times the control location (off-site) for the same sample period.

The control station ten times value is based on ten times an LLD value (4.66 sigma). Using an LLD value to evaluate anomalous measurements lends the comparison to be biased by the control station sample size and count time. As sample size and count time increase, the achievable LLD becomes proportionally lower. In this in-stance, the LLD for Mn-54 is low, resulting in an artifical anomalous measurement.

Possible explanation for the existance of such a disproportionate concentration of Mn-54 could be the very high bioaccumulation factor of manganese in fresh water mollusks, which are indigenous to the off-shore area of the site. The total release of bh-54 via liquid effluent from the site (Nine Mile Point Unit No. 1 Nuclear Station and the James A. FitzPatrick Nuclear Power Plant) for the period of July 1,1978 to July 1, 1979 was 0.574 Ci. Discharge dilution flow for this same period of time was caual to 2.19 + E+10 liters (dilution during discharge) .

The fresh water mollusks found in the vicinity of Nine Mile Point are not consumed by humans and are considered to be in the aquatic food chain to only a limited degree. Because fresh water mollusks are not considered edibic, no accurate estimate of the pessible dose contribution to man from their use as a food can be made. A dose estimate can be made using inflated parameters for the purpose of evaluation of possible dose contribution from the use of fresh water mollusks.

Using the average individual consumption of scafood of 1.0 kg/yr for an adult, the dose to ingestion would be 0.0005 mrem /yr whole body and 0.0074 mrem /yr to the gastrointestinal tract from 55-54 concentrations. As illustrated above the result-ing dose is very low and in reality would probably be 0.0 mrem because the species is inedibic. A review of FM-54 data from 1974 through 1978 shows that a definite 3 9 3. R E-

POWER ALTri10RITY OF Tile STATE OF NEW YORK JAMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET NO. 50-333 ATTACllNENT TO LER 79-051/04T-0 Page 2 of 2 trend exists for the reduction of bb-54 concentrations in mollusk samples. The reportable concentration of 0.55 pCi/g (wet) shows a continued reduction of bb-54 concentrations in sampled mollusk.

It should be noted that recent NRC reporting requirements, which were included in draft Technical Specifications, list the reporting level for Mn-54 as 30 pCi/g (wet). This new reporting level (which is not in effect yet for James A. Fitz-Patrick Nuclear Power Plant is nearly two orders of magnitude higher than the level being reported here.

NOTE: LER 78-068,78-072, 78-077,78-087 and 78-099 are similar events. In addition, this report is being submitted late due to Administrative error. The error occurred as a result of a similar event relating to the concentration of certain isotopes contained in other aquatic media samples. Based on telephone discussions with NRC Region I personnel, it was determined the event associated with the other samples did not require a report. The individuals responsibic for preparing this report erroneously assumed that none of the aquatic sampics, including the mollusk sample event, required a report.

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