ML19261F253
| ML19261F253 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/20/1976 |
| From: | Arnold R METROPOLITAN EDISON CO. |
| To: | |
| References | |
| GQL-1735, NUDOCS 7910250686 | |
| Download: ML19261F253 (4) | |
Text
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OCory DESCRIPTION Ltr. Furnishing Infor=ation on (RO-5C-ENCLOSU R E 289-76 !+8/ho en 12-08-76 cencerning seeinent Analysis Inaicating Isot4e Levels in Excess of 10x Backgrouna...
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Bgulatory Docket Filo METROPOLIIAN EDISON COMPANY POST OFFICE BOX 542 RE ADING. PENNSYLVANI A 19603 TELEPHONE 215 - 929-3C01 December 20, 1976 GQL 1735 L'r. J. P. O'Reilly, Director Office of Inspection & Enforcement, Regicn 1 U. S. Nucitar Regula: cry Cen=ission 631 Park Avenue ding of Prussia, PA 19hC6
Dear Mr. O'Neil17:
Docket No. 50-2S9 Operating License No. DPR-50 In accordance with the Tech. Spec. of our Three Mile Island :Iuclear Station
'; nit I (TMI-1), we are reporting the folleving reportable occurrence:
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1)
Report Number 76-h?/ho d
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2a) Required Report Date:
12/18/76 80mno Usnse
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2b) Date of Occurrence: 12/08/76 t
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3)
Pacility: Three L'ile Island Nuclear Station - Unit I s,
h)
Identification of Occurrence 4
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Title:
Sediment Analysis Indicating Isotope Levels in Excess v?
10x Rackground.
?/pe:
A reportable occurrence as defined by Technical Specifications 5.6.2.2.(A) in that a Sedir mt.W JyaJs showed I-131, Ra-lho, La-lh0, Zr-95, Nb-95, "e-lbl, Ru-103 values exceeding the backgrcund level t'/ greater than 10x.
5)
Conditions Prior to Occurrence:
N/A 13054 6)
Description of Occurrence:
Analyses of sediment samples obtained frc= the environs of the TITI Nuclear Station Uni: 1 on 10/21/76 and reported to Met-Ed by its consultants on 12/8/76 yielded radionuclide levels at one sediment indicator sample location (TM-AQS-981) {1 5 mi. downstrea=} ten times greater than the i==ediate devnstream indicator station (TM!-AGS-11A1)
{0.5 mi. devnstrea=} and the background staticn (TM-AQS-1A2) {0.7 mi.
upstrea=}.
'I'ne radienuclides detected are listed belev:
148\\ 26\\
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3 J. F. 0,'Reilly, Director OQL 1735 Radic-Indicator Indicator
Background
nuclide TM-AOS-931 TM-AQS-11A1 TM-AGS-1A2 (1 5 mi. downstream)
(0 5 mi. dcunstream)
(0.7 mi. upstream)
I-131 0.2h ! 0.037
<0.02
<0.01 Co-58 0.05 t 0.02h
<0.01
<0.01 Mu-Sh 0.018 0.015
<0.01
<0.01 Ba/La-1LO 0.85 2 0.088
<0.03
<0.03 Ru-103 1.2 0.12 0.086 0.032 0.09 0.025 Ce-lb1 2.6 ! 0.26
<0.02 0.077 0.026 2r-95 3.1 0.31 0.3h 0.13 0.21 0.052 Nb-95 2.h 0.2h 0.2h : 0.038 0 13 2 0.027 4
Cc-137 0.36 0.0L 0 39 0.058 0.29 0.035 All units in pCi/gm (dry) 7)
Designation of Apparent Cause of Occurrence:
An in-depth review of station effluent data indicates that the radioisotopes detected (at levels 10x above background) in the sediment at 9B1 are probably not due to station operation.
Cs-137, a radionuclide for which sedirent has a high adsorption affinity had nearly equal concentra-tiens at all three sampling locations.
Since the station effluent data showed CS-137 releases at the same crder of magnitude as Co-58 then it vould be anticipated that if the radioactivity detected devnetream vere due to plant operation then one vould expect to see higher levels of Cs-137 in the downstream sediment than in the background samples.
Therefore, it is our conclusien that the radioactivity present in the sediment is not due to station operation. These samples also coincided with the Chinese atmospheric tests of 9/25/76 and the presence of fallout radienuclides in the samples is obvious.
8)
Analyses of Occurrence:
This occurrence did not constitute a threat to the health and safety cf the public in that, the a cunt of radicactive material, the values in pCi/gs, and the location all tend to restrict any pcssible exposure to the population.
9)
Corrective Action:
Since this occurrence cannot be definitely attributed to a source other than the station, even though the Chinese weapons test occurred simulta-neously, the enviren= ental engineering staff vill closely follow the results of analyses to be performed on a routine basis during the folleving calendar year. A discussion of these analyses results vill appear in the annual radiological environmental monitoring progran report.
J. P. O'Reilly, Dirt GQL 1735
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- 10) Failure Data:
II/A Similar Event:
- Tone Sincerely, n(O R. C. /Ar. old Vice President RCA:DGM:kl
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