ML19261F177
| ML19261F177 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 12/29/1976 |
| From: | Creitz W METROPOLITAN EDISON CO. |
| To: | |
| References | |
| GQL-1779, NUDOCS 7910250597 | |
| Download: ML19261F177 (4) | |
Text
NRC FORM 195 u.s. NUCLE AR REGULATORY 9 tSS ION DOCKET NUMBER 42 787 50-289
N b bit REPORT NRC UGTRIBUTION FOR PART 50 DOCKET MATERI AL I
TO: J.P.0'REILLY FROM: METROPOLITAN EDISON CO.
DATE OF DCCUMENT READING, PA.
12/29/76 W.M. CREITZ DATE RECEIVED 1/6/77 C LETTE R CNOTORIZED PRCP INPUT FORM NUMBER OF COPIES RECEIVED G ORIGIN AL 6 UNC LASSIFIE D CCCPv i
DESCRIPTION ENCLOSURE LTR. FURNISHING REPORTABLE OCCURRENCE # 76-50 DO NOT REMOVE
/40, ON 12/21/76 CONCERNING THE SURFACE WATE;t ANALYSIS INDICATING A RADIONUCLIDE LEVEL IN EXCESS OF 10X background.......
g {070WLEDGED
( 1 SIGNED CY. RECEIVED)
( 3 PAGES)
PLANT NAME: THREE MILE ISLAND # 1 NOTE: IF PERSONNEL EXPOSURE IS INVOLVED SEND DIRECTLY TO KREGER/J. COLLINS FOR ACTION /INFORMATION Mb 1/14///
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GQL 1779 Dece=ber 29, 1976
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Mr. J. P. O'Reilly, Director
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Office of Inspection and Enforcement, Region 1 U. S. :!uclear Regulatcry Cc==ission
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Dear Sir:
Docket IIo. 50-289 Operating License :Io. DPR-50 In accordance with the Technical Specifications of our Three Mile Island Iluelear Station Unit 1 (TMI-1), we are reporting the following reportable occurrence.
(1) Report :iumber:
76-50/h0 (2a) Required Report Date:
1/1/77 (2b) Date of Occurrence:
12/21/76 (3) Facility: Three Mile Island :iuclear Station - Unit 1 (h) Identification of Occurrence:
Title:
Surface Weter Analysis Indicating a Radienuclide Level in Excess of 10X Background.
?/pe :
A reportable occurrence as defined by Technical Specifications 5.6.2.2.(A) in that an analysis of Surface Water showed a Zr-:Ib-95 value exceeding the background level by greater than 10X.
183 1481 091
, (5) Conditions Prior to Occurrence:
N/A (6) Description of Occurrence:
Analysis of the Month]y Ccmposite Curface Water sample collected 11/4/76 through 11/30/76, analysed 12/13/76 and reported to Met-Ed by its consultants en 12/21/76 yielded radionuclide levels at one indicator location (TM-sW-9A2), apprcximately 0 5 miles downstream, ten times greater than the background station TM-5W-15F1 approximately 8.7 miles upstream of the station.
The analysis results are as follevs:
Background
TM-SW-15F1 Zr-Nb-95
<0.4 pCi/L Indicator TM-SW-9A2 Zr-:ib-95 L.h 1 0.7 pCi/L (7) Designation of Apparent Cause of Occurrence:
A thorough review of station effluent data and other environmental media sample analysis results indicates that this result should not be attributed to station operatien in that:
a)
Zr-95 was not discharged from TMI during Novcmber in concentrations above minimum detectable levels.
b)
Nb-95 discharged from '3fI during November had a maximum ccncentratien of 0.08pCi/L and an average concentration of 0.0027pCi/L.
These values do not include river water diluticn between the effluent pipe and the na=pling point.
c)
Zr-Nb-95 was noted in higher than normal concentrations in air particulate, sediment and fish samples in both background and indicator sampling locaticns during this perio<i due to fallout from the Chinese Atmospheric weapons test.
1481 092
d)
Zr-Nb-95 was not noted in the discharge water aceposite sample taken over the same period.
e)
Zr-Nb-95 was noted in similar cencentrations in the upstream (background) lccation but not in the indicator (downstream) location during the October sampling period.
Therefore, it is our conclusion that the radicactivity present in the subject sample in all probabi_1ty is not due to station operation, and should be attributed to fallout frem the atomspheric weapons tests of September and Nove=ber, 1976.
(8) Analysis of Occurrence:
This occurrence did not constitute a threat to the health and safety of the public in that: the concentration of radicactive material noted is less than 1/10C00th of the Maximum Permissable Concentration of 10CFR20.
(9) Corrective Action:
Since this occurrence cannot te definitely attributed to a source other than the station, the environmental engineering staff vill closely monitor results of analyses performed in accordance with the requirements of the Environnental Technical Specificaticns. A discussion of these analysis results vill be included in the annual radiological environmental =cnitoring program report.
(10) Failure Data:
N/A Similar Event:
Report Nos. 76 k3/h0 76-h8/LO Sincerely, I
W. M. Cr it:
President WMC:DGM:rk
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