ML19210C201
| ML19210C201 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/14/1978 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Herbein J METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7911130452 | |
| Download: ML19210C201 (1) | |
Text
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April 14, 1978 Docket Nos. 50-289 50-320 Metropolitan Edison Ccmpany ATTN: Mr. J. G. Herbein Vice President P. O. Box 542 Reading, Pennsylvania 19603 Gentlemen:
Enclosed is IE Bulletin No. 78-05 which requires action by you with regard to your power reactor facility (ies) having an operating license or a construction permit.
Should you have questions regarding this Bulletin or the actions required, please contact this office.
Sincerely,
&u$.
r ooyce H. Grier
- Director
Enclosures:
1.
List of IE Bulletins Issued in 1978 cc w/encls:
J. P. O'Hanlon, Unit 1 Superintendent R. L. Wayne, QA Manager, Design & Construction T. Broughton, Safety & Licensing Manager R. W. Heward, Jr., Project Manager R. C. Arnold, Vice President, Generation L. L. Lawyer, Manager, Generation Operations - Nuclear G. P. Miller, Superintendent J. L. Seelinger, Unit 2 Superintendent Gerald Charnoff, Esquire I. R. Finfrock, Jr.
Miss Mary V. Southard, Chairman, Citizens for a Safe Environment
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I Radioactive iodine may be ingesced by milk cows after deposition in gracing areas.
Radiation exposure to the thyroid gland can result from drinking milk from these cows. A liter of milk consumed daily from a cow grazing five months per year at the nearest dairy farm (1-1/2 miles ESE) would result"in a dose to an infant's thyroid of about 9 mrem /yr.
k 3.
Radioactive Materials Released to Receiving Water During normal operation of the plant, the liquid radwaste effluent will be combined with the forced draft cooling tower blowdown before release into the Susquehanna River.
Calculation of radiation doses from radionuclides released into the liquid effluent requires estimating the concentrations of these radionuclides at the point of discharge. A nominal flow rate of 36,000 gallons per minute (60 cis).for the cool.ing t,ower 'olewdown was used to calculate the liquid radwaste dilution in' the discharge canal. The river flow ranges from a low of 1,600 cfs to a maximum flood level of 740,000 cfs with an average annual flow of 34,000 cfs. Thus, an additional factor of 100 was conservatively assumed in order to estimate the effluent dilution af ter mixing with the river water.
The principal pathways leading to exposure doses to man are drinking water from the river, consuming fish and invertebrates caught in the river, and swimming, boating, and picnicking in or on the shore of the river.
Bio-accumulation factors used to calculate doses from fish and invertebrate con-sumption are listed in Table 11.
The doses to individuals resulting from the previously mentioned pathways are calculated using the estimated annual nuclide liquid releases given in Table 6 and dilution factors described above.
In addition, it was assumed that each person drinks 1,200 cc of water per day, consumes 20 grams of fish and 5 grams of invertebrates per day, swims 100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> per year, and goes boating and picnicking on the shoreline for 500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> per year. A delay of twenty-four hours is assumed between release and con-sumption.
No delay factor is considered for recreational use. The results of the individual dose calculations are summarized in Table 12.
4.
Population Doses From All Sources Values of the cumulative dose to the population from gascous effluents basedon1970censusfigures$[3listedinTable13forvariousdistancesfrom d
the station. The combined dose to all individuals living within fif ty miles of the station (1,868,000) from exposure to radioactive gaseous effluents is estimated to be 9.4 man-rem per year.
It was assumed that 10 percent of this total population would be exposed while fishing, boati'ng or picnicking in the immediate vicinity of the plant.
The dose from ingesting fish and 1-mrtebrates was estimated by assuming
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that 10 percent of the total population wi' in a fifty mile radius of the station obtained 25 percent of this intake from the Susquehanna River.
Thus, the effective exposed population via this pathway is 47,000. The combined annual population dose via the drinking water, fish, invertebrate, recreation and transportation (of nuclear fuel and solid radioactive waste) pathways is calculated to be 33 man-rem.
The population dose from all of the above pathways is summarized in Table 14.
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U TABLE 12 ANNUAL DOSES AT EQUILIBRIUM CONDITIONS TO INDIVIDUALS'AT VARIOUS LOCATIONS b--
DOSE (MREM /YR)
LOCATION PATHWAY CI TRACT THYROID TOTAL EODY 0.5
.ar3-- O.25" Exclusion Line Cloud (2170' ESE)
-- Residencel Cloud 0.3
,Lc8' O./3 (2340' E)
Residence 1 Cloud 0.4 af7' O.2/
(2460' ESE) 0.06 AW6' O. OV Ooldsboro Cloud (nearest town 1.5 miles W) 0.1 075' O. o Y Three Mile Island Cloud 2
Recreation Area (3500' S) 0.1 JLJL 0,05I Shelly's Island Cloud (2000' W) 3 8.6 Dairy Farm Ingestion (1.5 miles E) of milk Susquehanna River Drinking water 0.009 2.0 0.04 Fish Consumption 0.06 0.03 0.2 Invertebrate Consumption 0.02 0.2 0.05 0.0009 Swimming Picnicking, fishing and 0.003 boating ANo shielding was assumed.
2Dose calculation assumes an occupancy of 3 months per year.
3 Dose to a child's thyroid based on consuming one liter of milk daily from a cow grazing five months per year at that particular farm.
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TABLE 13
'i CUMULATIVE ANNUAL POPULATION DOSE AND AVERAGE DOSE FROM GASEOUS EFFLUENTS TO THE POPULATION 'JP TO 50 MILES FROM THE STATION ANNUAL CUMULATIVE CUMULATIVE AV. ANNUAL INDIVIDUAL 4
RADIUS POPULATION DOSE DOSE FOR CUMULATIVE POPULATION (miles)
(man-rem)
(mrem /yr) 0-1 '
580 0.24 0.403 0-2 2,350 0.51 0.215 0-3 9,000 1.0 0.112 0-4 17,300 1.4 0.079
{~ m 0-5 24,500 1.6 0.065 0-10 136,400 3.4 0.025 0-20 621,300 6.3 0.010 0-30 995,200 8.0 0.008 0-40 1,235,000 8.7 0.007 0-50 1,868,000 9.4 0.005
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