ML19318A869
| ML19318A869 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 05/28/1980 |
| From: | CONNECTICUT YANKEE ATOMIC POWER CO. |
| To: | |
| Shared Package | |
| ML19318A868 | List: |
| References | |
| NUDOCS 8006240301 | |
| Download: ML19318A869 (2) | |
Text
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Facilityt Haddam Neck Nuciccr Fccility Report Number: ETS/NR/50-213/80-04
. Report Date: May 28, 1980
' Occurrence Date: First Quarter, 1980 DESCRIPTION OF OCCURRENCE:
The following level of tritium-(H-3) activity was observed in the quarterly composite of river water near the discharge area and this exceeded the control station (Middletown) by greater than a factor of ten.
Analysis Confirmation Results Sample Dates Report Date Date (pCi/l)
Discharge Area.
Continuous 1/4-3/28 4/21 5/19 1,810:130 Middletown Weekly grabs 1/4-2/8 4/21 5/19 150 70 (control)
PLANT OPERATING CONDITIONS PRIOR TO OCCURRENCE:
' The plant was operating at about 100% power throughout most of the first quarter of 1980.
During the latter part of the quarter, primary systems were being processed in preparation for the refueling outage.
CAUSE OF OCCURRENCE:
Due to the increased amount of primary water which must be processed in preparation for a refueling outage, the amount of radioactivity released in liquid discharges is typically higher during the few months preceeding the shutdown. Thus, for the first quarter of 1980, 1810 Curies of tritium were released compared with an average release over the past 3 years of 1180 Curies per quarter.
This slight increase in release rates, resulted in river water tritium levels approximately 20% greater than an overly conservative reporting limit (see Corrective Actions).
CORRECTIVE ACTIONS:
. A dose calculation using Reg. Guide 1.109 methodology was performed.
The calculation assumed an individual could have consumed fish, resident in ' river water having the tritium concentration as measured.
The whole body dose would be'O.0009 mrem. There is no drinking water pathway.
Another more conservative calculation is to again use 'the Reg. Guide 1.109 methods, assume that the fish are resident in the discharge canal, and use the measured plant discharges for this quarter. This results in the calculation of 0.0012 mrem for the 1st quarar.
These calculations are conservative in that the fish do not reside L8 0062 4 03df
,.. at this location' of maximum activity 100% of the time.
The calculated dose of 0.0012'arem is an extremely small fraction (less than 0.0004) of the natural background radiation exposure to this individual during this quarter which is about 30 millirem.
Thus the dose consequence of -this event is insignificant.
The Technical Specification reporting requirement is obviously over conservative.
Therefore, the appropriate corrective action is to revise the reporting requirements.
This will be accomplished upon approval of the proposed radiological effluent technical specifications, as submitted to the NRC on August 1, 1979.
No other corrective actions are required due to the insignificance of the measured levels.
41 l
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