ML20087D043

Offsite Radiation Dose Assessment,1983

ML20087D043
Person / Time
Site:	Prairie Island
Issue date:	12/31/1983
From:	NORTHERN STATES POWER CO.
To:
Shared Package
ML20087C965	List: ML20087C959 ML20087C999 ML20087D043 ML20087D075
References
NUDOCS 8403130270
Download: ML20087D043 (4)

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.K NORTHERN STATES POWER COMPANY PRAIRIE ISLAND NUCLEAR GENERATING PLANT 0FFSITE RADIATION DOSE ASSESSMENT for JANUARY 1 - DECEMBER 31, 1983 An. assessment of radiation dose due to releases from the Prairie Islar.d Nuclear Generating Plant during 1983 was performed in accordance with the Technical Specifications. ' Computed doses were well below the 40 CFR Part

, 190 and 10 CFR Part 50, Appendix I standards and guidelines.

. -Offsite dose calculation formulas and meteorological data ware used from the 0ffsite Oose Caluclation Manual in making this assessment. Source terms were obtained from the two Effluent and Waste Disposal Semi-Annual reports prepared for NRC review durir.g the year.

Offsite Doses from Gaseous Release 4 Computed' doses due to gaseous releases are reported in Table 1. Critical

' receptor location and pathways for organ dose are reported in Table 2.

Doses, both whole. body and organ, are a small percentage of. Appendix I guidelines.

Offsite Doses from Liquid Releases Computed doses due to liquid releases are reported in Table 1. Receptor information is reported in Table 2. Doses, both whole body and organ, are a small percentage of Appendix I guidelines.

Doses to Individuals Due to Activities Inside the Site Boundary Occasional sportsmen will enter the Prairie Island site for recreational activities. These individuals are not expected to spend more than a few hours per year within the site boudary. Commercial and recreational river traffic exists through this area.

For purposes of estimating dose due to recreational and river transportation activities within the site boundary, it is assumed that the limiting dose within the site boundary would.be received by an individual who spends a

- total of ~ seven days per year on the river just off shore from the main plant buildings (ESE at 0.2 miles). Whole body and inhalation organ doses were-calculated for this location and occupancy time. These doses are re-ported in Table 1.

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f s Doses to Most Exposed Member of the General Public from Reactor Releases and Other Nearby Uranium Fuel Cycle Sources There are no uranium fuel cycle facilities in the vicinity of the Prairie Island site.

The only other source of exposure to the general public in addition to the plant gaseous and liquid effluents is from direct radiation. Pressucized water reactor direct radiation has been shown to be negligible. An array of TLD monitoring locations at the site beundary has consistently indicated that plant operation in recent years has nad no effect on ambient gamma radiation.

- Therefore, the most exposed member of the general public will not receive a L radiation dose from reactor releases and all other fuel cycle activities in excess of the sum of the liquid and gaseous whole body and organ doses reported in Table 1 for the site boundary and critical receptor, respec-

-ttvely. These doses are well within the 40 CFR Part 190 standards of 25 mrem to the whole body or any organ (except the thyroid) and 75 mrem to the thyroid every 12 months.

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TABLE 1 0FFSITE RADIATION DOSE ASSESSMENT - ?RAIRIE ISLAND PERIOD: JANUARY 1 THROUGH DECEMBER 31, 1983 10 CFR Part 50 Appendix I Gaseous Releases Guideline Per Year

_Mr.ximum Site Boundary Gamma Air Dose (mrad) 0.14 20 Maximum Site Boundary BetT Air Dose (mrad)* 0.44 40 Maximum Offsite Dose to Any Organ (mrem)*

Total 1.11 30 Offshore Location (mrem, 7 days / year)

Whole Body 0.00006 10

-Organ 0.00004 30 Liquid Relcases Maximum Offsite Whole Body Dose (mrem)

Total 0.003 6 Maximum Offsite

' Organ Dose (mrem)*

Total 0.005 20

. *Long lived particulates, I-131, and tritium.

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TABLE 2 0FFSITE RADIATION DOSE ASSESSMENT SUPPLEMENTAL INFORMATION - PRAIRIE ISLAND PERIOD: JANUARY 1 THROUGH DECEMBER 31, 1983 4

Gaseous Effluents Maximum Site Boundary Dose Location (from building vents)

Sector WNW

-Distance (mi). 0.36 -

. 0ffshore Location Within Site Bour.dary Sector ESE Distance (mi) 0.2 Maximum Offsite Dosa Location Sector WU'd Distance (mi) 0.7 Pathways Ground, ,

inhalation, vegetables Age Group Child Organ- Thyroid

' Liquid Effluents

- Maximum Offsite '

Dose Location Downstream

^ Pathways Fish Age Group Adult

. Organ Thyroid

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