ML20003D508

Annual Radiation Environ Monitoring Program,1980.

ML20003D508
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Site:	Prairie Island
Issue date:	02/26/1981
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O Si2 HAZLE"

^ CON ENVIRONMENTAL SCIENCES A CMSICN CF HAZLETON LABCAATCAIES AME AICA. INC.

1500 FACNTAGE ACAO. NCATHOACCH:. ILUNCIS SCCe2 U S A NORTHERN STATES POWER COMPANY MINNEAPOLIS, MINNESOTA PRAIRIE ISLAND NUCLEAR GENERATING PLANT DOCKET NO. 50-282 LICENSE NO. DPR-42 50-306 DPR-60 ANNUAL REPORT to the l UNITED STATES NUCLEAR REGULATORY COMMISSION Radiation Environmental Monitoring Program January 1,1980 to December 31, 1980 Prepared Under Contract by HAZLETON ENVIRONMENTAL SCIENCES Project No. 9079 l Approved by: 7.

! LYG.[y' ebner,M.S..

l Director, Nuclear Sciences l

l 26 February 1981 DMONE (3121564-0700 o TELE x 20 9403(HAZES NBAK) l k hD5

HAZLETON ENVIRONMENTAL SCIENCES PREFACE The staff members of the Nuclear Sciences Department of Hazleton Environmental Sciences, a Division of Hazloton Laboratories America, Inc. (HES), were responsible for the acquisition of data presented in this report. The staff includes L. Kuckla, N. Lamich, D. Rieter, J. Woods, and S. Yamagata. Envi ron-mental samples were collected by personnel of Northern States Power Company.

The report was prepared by L. G. Huebner, Director, Nuclear Sciences. He was assisted in the report preparation by C. A. Galioto, Group Leader, and C. R.

Marucut, Section Supervisor, Nuclear Sciences.

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HAZLETON ENVIRONMENTAL SCIENCES TABLE OF CONTENTS l

o N_o Page PREFACE 11 List of Tables iv

1.0 INTRODUCTION

1 2.0

SUMMARY

2 3.0 RADIATION ENVIRONMENTAL MONITORING PROGRAM (REMP) 3 3.1 Program Design and Data Interpretation 3 3.2 Program Description 4 3.3 Program Execution 6 3.4 Laboratory Procedures 6 3.5 Program Modifications 7 3.6 Census of Milch Animals 7 i 4.0 RESULTS AND DISCUSSION 9 l

4.1 Effect of Chinese Atmospheric Nuclear Detonation 9 l

4.2 Program Findings 9 1

! 5.0 TABLES 15

6.0 REFERENCES

CITED 33 APPENDIX A. Crosscheck Program Results A-1 B. Data Reporting Conventions B-1 l C. Maximum Permissible Concentrations of Radioactivity in l

Air and Water Above Natural Background in Unrestricted Areas C-1 iii

HAZ1.ETON ENVIRONMENTAL SCIENCES l

LIST OF TABLES No. Title Page l

5.1 Sample collectioi; and analysis program,1980 16 5.2 Sampling locations 18 l

5.3 Missed collections and analyses,1980 23 5.4 Environmental radiological monitoring program sumary 24 In addition, the following tables are in the Appendix:

Appendix A A-1 Crosscheck program results, milk and water samples, 1975-1980 A-4 ,

A-2 Crosscheck program results, thermoluminescent dosimeters (TLD's) A-9 Appendix C C-1 Maximum pennissible concentrations of radioactivity in air and water above natural background in unrestricted areas C-2 O

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HAZLETON ENVIRONMENTAL. SCIENCES

1.0 INTRODUCTION

This report summarizes and inteprets results of the Radiation Environmental Monitoring Program (REMP) conducted by Hazleton Environmental Sciences at the Prairie Island Nuclear Generating Plant, Red Wing, Minnesota, during the period January - December,1980. This program monitors the levels of radioacti-vity in the Sir, terrestrial, and aquatic environments in order to assess the impact of the plant on its surroundings.

Tabluation of the individual analyses made during the year are not included in this report. These data are included in a reference document (Hazleton Environmental Sciences 1981) available at Northern States Power Company, Nuclear Support Services Department.

Prairie Island Nuclear Genersting Plant. is located on the Mississippi River in Goodhue County, Minnesota, and operated by Northern States Power Company. The plant has two 550 MWe pressurized water reactors. Unit .1 achieved initial criticality on 1 December 1973. Commercial operation at full power began on 16 December 1973. Unit 2 achieved initial criticality on 17 December 1974 I Commercial operation at full power began on 21 December 1974.

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HAZLETON ENVIRONMENTAL SCIENCES 2.0

SUMMARY

The Radiation Environmental Monitoring Program (REMP) required by the U.S. .

Nuclear Regulatory Commission (NRC) Technical Specifications for the Prairie Island Nuclear Generating Plant is described. Results for 1980 are summarized and discussed.

No effect on the environment due to the operation of the Prairie Island Plant F is indicated. There was, however, a slight effect of the fallout from the atmospheric nuclear detonation on 16 October 1980 of a device in the 200 kiloton to 1 meoaton range which resulted in an elevated gross beta activity in airborne particulates during the last quarter of 1980 and the presence of a small amount of iodine-131 in two milk samples collected 19 November 1980.

The presence of the long-lived fission products, strontium-90 and cesium-137, in several sampling media indicated a long range fallout effect from previous atmospheric nuclear detonations.

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HAZLETON ENVIRONMENTAL. SCIENOES 3.0 RADIATION ENVIRONMENTAL MONITORING PROGRAM (REMP)

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3.1 Program Design and Data Interpretation l

The purpose of the Radiation Environmental Monitoring Program (REMP) at the Prairie Island Nuclear Generating Plant is to assess the impact of the plant on its environment. For this purpose. samples are collected from the air, terrestrial, and aquatic environments and analyzed for radioactive content. In addition, ambient gamma radiation levels are l

monitored by thermoluminescent dosimeters (TLD's).

Sources of environmental udiation include the following:

(1) natural background radiation arising from cosmic rays

, and primordial radionuclides; (2) fallout from atmospheric nuclear detonations; (3) releases from nuclear power plants.

In interpreting the data, effects due to the Plant must be distinguished from those due to other sources.

A major interpretive aid in assessment of these effects is the design of the monitoring program at the Prairie Island Plant which is based on the indicator-control concept. Most types of samples are collected both at indicator locations (nearby, downwind, or downstream) and at control locations (distant, upwind, or upstream). A plant effect would be indicated if the radiation level at an indicator location was signifi-cantly larger than that at the control location. The difference would have to be greater than could be accounted for by typical fluctuations in raidation levels arising from other sources.

. An additional interpretive technique involves analyses for specific radionuclides present in the environmental samples collected from the Plant site. The Plant's monitoring program includes analyses for tritium, strontium-89, strontium-90, and iodine-131. Most samples are also analyzed for gamma-omi tting isotopes with results for the following groups quantified: zirconium-95, cesium-137, cerium-144, bery111um-7, and potassium-40. The first three gamma-emitting isotopes were selected as radiological impact indicators beccuse of the different characteristic proportions in which they appear in the fission product mix produced by a nuclear reactor and that produced by a nuclear detonation. Each of the three isotopes is produced in roughly equivalent amounts by a reactor:

each constitutes about 10% of the total activity of fission products 10 3

HA2LETON ENVIRONMZNTAL CCCNC3D days after reactor shutdown. On the other hand,10 days after a nuclear explosion, the contributions of zirconium-95, cerium-144, and cesium-137 to the activity of the resulting debris are in the approximate ratio 4:1:0.03 (Eisenbud, 1963). Beryllium-7 is of cosmogenic origin and potassium-40 is a naturally-occurring isotope. They were chosen as calibration monitors and should not be considered radiological impact indicators.

The other group quantified consists of niobium-95, ruthenium-103, and

-106, cesium-134, barium-lanthanum-140, and cerium-141. These isotopes are released in small quantities by nuclear power plants, but to date their major soarce of injection into the general environment has been atmospheric nuclear testing. Nuclides of the final group, manganese-54, cobalt-58, and -60, and zinc-65, are activation products and arise from activation of corrosion products. They are typical components of nuclear power plant's effluents, but are not produced in significant quantities by nuclear detonations.

Other means of distinguishing sources of environmental radiation can be employed in interpreting the data. Current radiation levels can be compared with previous levels, including those measured before the Plant became operational. Results of the Plar.t's Monitoring Program can be related to those obtained in other parts of the world. Finally, results can be related to events known to cause elevated levels of radiation in the environment, e.g., atmospheric nuclear detonations.

3.2 Program Description The sampling and analysis schedule for the environmental radiation monitoring program at Prairie Island is summarized in Table 5.1 and briefly reviewed below. Table 5.2 defines the sampling location codes used in Table 5.1 and specifies for each location its type (indicator or control) and its distance, direction, and sector relative to the reactor site. To assure that sampling is carried out in a reproducible manner, detailed sampling procedures have been prescribed (Hazleton Environmental Sciences Corporation, 1978c).

To monitor the air" environment, airborne particulates are collected on membrane filters by continuous pumping at four locations. Also, airborne iodine is collected by continuous pumping through charcoal filters at three of these locations. Filters are changed and counted weekly.

Particulate filters are analyzed for gross beta activity and charcoal filters for iodine-131. A monthly composite of all particulate filters is gamma-scanned on a Ge(L1) detector. Two of the four locations are indicators, and two are controls (P-1 and P-2). One of the indicators (P-3} is located near the residence expected to be most susceptible to .

any atmospheric emissions from the Plant (highest X/Q residence).

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HA2LETON ENVIRONMZNTAl. SCIENC23 Ambient gamma radiation is monitored at the same four air sampling locations using CaF 2:Mn thermoluminescent dosimeters (TLD's). The sensors are placed in pairs at each location and are collected and measured quarterly.

In addition, as a " Lessons Learned" commitment, ambient gamma radiation is monitored at thirty-two (32) special locations, using three (3) LiF2 chips mounted in the card: ten (10) in an inner ring in the general area of the site boundary, fifteen (15) in the outer ring within 4-5 mi radius, six (G) at special interest locations and one centrol location, 11.1 mi distant from the plant. They are replaced and measured quarterly.

Also, a complete emergency set of TLD's for all locations, including four I

air sampling locations, is kept in the shield at the Plant. The emergency set is returned to the HES laboratory quarterly for annealing and repack-aging.

Milk samples are collected monthly from five farms (four indicator and one control). All samples are analyzed for iodine-131. In addition, samples from the control location (P-25, Kinneman Fann) and the highest X/Q location (P-14, Gustafson Farm) are analyzed for strontium-89, strontium-90, and for gamma-emitting isotopes.

I For additional monitoring of the terrest. 'ai environment, natural vegeta-tion (such as grass) is collected sem) inually from three locations (including the highest X/Q milk locat- P-14 and the milk control location P-25). Samples are analyzed for 1ma-emitting isotopes inclu-ding todine-131. Cabbage is collected annu. y from a garden nearest the Plant and a control location (P-25) and anal, ed for iodine-131. Corn is collected vinually from the highest X/Q farm 14) and a control location (P-25) and analyzed for gamma-emitting isotop t. Also, well water is j collected quarterly and analyzed for tritium ar.. gamma-emittino isotopes.

i Finally, topsoil is collected every three years 6 d analyzed for strontium

-90 and gamma-ciitting isotopes. The latest coli etion of soil was made

! in 1979.

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l. River water is collected weekly at two locations, or.: uostream of the l

Plant (P-5) and one downstream (P-6, Lock and Dam #3). Monthly composites are analyzed for gamma-emi tti r.g isotopes. Quarterly composites are l- analyzed for tritium, strontium-89, and strontium-90.

Drinking water is collected weekly from the City of Red Wing well.

l Monthly composites are analyzed for gross beta activity and gamma-emitting l isotopes. Quarterly composites are analyzed for tritium.

The aquatic environment is also monitored by semi-annual upstream and downstream collections of fish, periphyton or macroinvertebrates, aquatic vegetation, and bottom sediments. Shoreline sedment is collected semi-annually.

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i HAZLETON ENVIRONMENTAL. SCIENCES 3.3 Program Execution The Program was executed as described in the preceding section with the following exceptions:

(1) TLD data was not available for the third quarter of 1980 for location P-1 because of theft of the dosimeters.

(2) Airborne particulate gross beta data from location P-2 for the period 1-21 to 1-29-80 was not available due to pump mal function.

l j These deviations from the Program are summarized in Table 5.3.

l l 3.4 Laboratory Procedures All strontium-89, strontium-90, and iodine-131 analyses in milk were made by using a sensitive radiochemical procedure which involves separation of the element by use of an ion-exchange resin and subsequent beta counting.

All gamma-spectroscopic analyses were performed with a Ge(Li) detector.

Levels of iodine-131 in cabbage and natural vegetation were determined by Ge(Li) spectrometry. Levels of airborne iodine-131 in charcoal samples were measured by Ge(Li) spectrometry.

l Tritium levels were determined by liquid scintillation technique.

Analytical procedures used by the Nuclear Sciences Department of Hazleton Environmental Sciences are specified in detail elsewhere (NALC0 Environ-l mental sciences,1977a). Procedures are based on those prescribed by the National Center for Radiological Health cf the U. S. Public Health Service (U. S. Public Health Service,1967) and by the Health and Safety Laboratory of the U. S. Atomic Energy Commission (U. S. Atomic Energy i, Commission, 1972).

I

, Hazleton Environmental Sciences has a comprehensive quality control / quality assurance program designed to assure the reliability of data obtained.

Details of Hazleton's QA Program are presented elsewhere (NALC0 Environ-mental Sciences 1971a,1971b,1975, and Hazleton Environmental Sciences, 1980). The HES QA Program includes participation in laboratory intercom-parison (crosscheck) programs. Results obtained in crosscheck programs are presented in Appendix A.

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HAZLETON ENVIRONMENTAL SCIENCES 3.5 Program Modifications Beginning 1 January 1980, thirty-two (32) new TLD locations were added to the program as a " Lessons Learned" commitment. Ten (10) of these locatnns were selected in an inner ring in the general area of the site boundary, fifteen (15) in the outer ring within 4-5 mi radius of the plant, six (6) at special areas of interest, and one (1) at a control l location,11.1 mi distant from the plant. Ihree LIFE chips mounted in the card were placed at each location and were exchanged and read I quarterly.

In addition, a complete set of TLD cards for all locations, including four air sampling locations are kept in the shield at the p' ant for emergency purposes. The cards are returned to the HES laboratot quarterly for annealing and repackaging.

Several additional sample collections which are not a part of the program were perfomed in 1980. Nine goat's milk samples were collected from mid June through the second part of November 1980 from three fams and analyzed for iodine-131. Also, one collection of clams was performed in September in the vicinity of the site.

3.6 Census of Milch Animals In accordance with Technical Specification 4.10,. paragraph B, several surveys of milch animals were conducted in the area of the Plant during 1980. On 6 June 1980 an extensive survey was conducted within a one mile radius of the Plant (or 15 mrem / year distance). Most cattle observed were used for beef rather than milk production. No new milk producing herds were found.

On 18 June 1980 a census for milk cows within a five mile radius was completed. With the assistance of the Agricultural Agent of Goodhue and

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Pierce Counties, it was determined that several milk herds in Wisconsin had discontinued operations. Current raw milk sampling locations were not affected. No new herds were identified.

e On 18 June and 25 June 1980 a census of goat herds within a 15 mile radius of the Plant was completed. After vism with three county agricultural agents, a county 4-H Agent, and several members of the Wisconsin Dairy Goat Association, it was determined that there were no reliable suppliers of goat milk in the area. Most herds in the area are ,

kept as hobbies or as part of youth education programs conducted by 4-H '

organizations. Although goat milk sampling is not a part of the routine program, certain goat milk samples, when available, were collected and analyzed.

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HAZLETON CNVIRONMINTAL CCl2NC3D On 27 August and 2 September 1980, the mid-season census of milch pro-ducing animals was completed. No new herds were identified. None of the surveys resulted in changes of milk sampling locations.

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HAZLETON ENVIRONMENTAL SCIENCES 4.0 RESULTS AND DISCUSSION All of the scheduled collections and anal.vses were made except those listed in Table 5.3.

l All results are summarized in Table 5.4 in a format recommended by the Nuclear Regtlatory Commission in Regulatory Guide 4.8. For each type of analysis of each sampled medium, this table lists the mean and range for all indicator locations and for all control locations. The locations with the highest mean i and range are also shown.

4.1 The Effect of Chinese Atmospheric Nuclear Detonation One atmospheric nuclear detonation was reported during 1980. The test was conducted by the People's Republic of China on 16 October 1980. The reported yield was in the 200 kiloton to 1 megaton range. Gross beta results for air particulates indicate that the effect of the fallout in the central United States was not noticeable until two weeks after the test. During the previous Chinese tests in 1977 and 1978, the effect was noticed about one week after the test. This delay is probably attributable to dry weather following the test postponing the rainout of radioactive particles until second or subsequent passes of the radioactive cloud over the United States. Presence of low level of iodine-131 in only two milk samples and only moderate increase of beta activity in airborne particu-l lates supports this assumption.

l The usual spring peak, a phenomenon that is observed worldwide almost annually (Wilson et al.,1969) was not evident in 1980 (1976 and 1979 were also an exception). These spring peaks have been attributed to i fallout of nuclides from the stratosphere (Gold et al.,1964).

l 4.2 Program Findings

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A number of program findings reflect effects of the latest Chinese and previous worldwide atmospheric nuclear tests. The chief environmental l e indicators of test effects were airborne particulates and, to a lesser degree, milk.

Ambient Radiation (TLD's)

At four regular air sampling locations, indicator TLD's averaged 13.3 mrem /91 days and control TLD's averaged 15.9 mrem /91 days. The doses measured by control TLD's were about 20% higher than indicator TLD's.

Higher readings at control locations are due to higher readings at location P-2, which historically yielded about 40% higher readings than the second control i

HAZLETON ENVIRONMENTAL SCIENCES location, P-1. The means at special locations were similar to those measured at regular air sampling locations and ranged from 11.2 mrem /91 days at inner ring locations to 13.5 mrem /91 days at outer ring locations.

The differences are not statistically significant. The dose rates measured were similar to those observed in 1978 (12.1 and 15.1 mrem /91 days, respectively and in 1979 (12.6 and 15.3 mrem /91 days, respectively).

No Plant effect on ambient gamma radiaticn was indicated.

i Air Particulates The ayerage annual gross beta activity in airbornq particulates was 0.032 pCf/mJ at indicator locations and 0.033 pQi/m3 at control locations and was 60% lower tt),an in 1978 (0.093 pCi/mJ) and about 15% lower than in 1979 (0.038 pCi/m3). In the first quarter of 1980 weekly gross betg activity averaged 0.032 pCi/m3, then leveled off at about 0. 23 pC1/m3 during the second and third quarters and rose to about 0.053 pCi/m3 during the fourth quarter.

Increase of the gross beta activity during the fourth quarter is attribu-table to the fallout form the nuclear test conducted 16 October 1980.

Two pieces of evidence indicate conclusively that the elevated activity observed during the fourth qdarter was not attributable to the Plant. In the first place, elevated activity of similar size occurred simultaneously at both the indicator and control locations. Secondly, an identical

pattern was. observed at the Monticello Generating Plant, some 100 miles distant from the Prairie Island Generating Plant (Northern States Power Company,1981).

i Trace amounts of niobium-95, ruthenium-103, and cerium-141 were detected in November and December composite samples. Presence of these isotopes in airborne particulates is also attributable to the fallout from the recent nuclear test. Except for beryllium-7, all other gamma-emitting isotopes were below their respectiv LLD levels. None of the activities

- detected were attributable to the Plant operation, e Airborne Iodine Airborne iodine-131 results were below the detection limit of 0.07 pCi/m3 in all samples. Thus, there was no indication of a Plant effect.

Milk All results for iodine-131, except two cow's milk samples, were below the LLD of 0.25 pCi/1, includin<' five goat's milk samples. The mea-10

HAZ1.ETON CNVIRONMZNTAl. SCIENCES sured activity, 0.4 pCf /1 and 5.4 pCi/l was detected in samples collected 19 Novem'oer 1980, approximately four weeks af ter the nuclear test. Since detected activity was observed at both control (0.4 pC1/1) and indicator (5.4 pCi/1) locations, and since a similar pattern was observed a week earlier at the Monticello Nuclear Generating Plant 100 miles distant from Prairie Island , it is clearly attributable to the latest Chinese nuclear test.

Strontium-90 results averaged slightly higher at the control location (P-25, Kinneman Farm), and all detectable results were in the range 1.9-4.9 pCi/1, a range consistent with 1976,1977,1978, and 1979 observa-tions at Prairie Island. Strontium-90 levels in this range are attribu-table to worldwide fallout from previous atmospheric nuclear tests and reflect the long half-life (28.6 yrs) of this isotope.

Cesium-137 results were below the LLD level of 15 pCi/1 in all samples.

Cesium-137 is also a long-lived component (with a half-life of 30.24 years) of worldwide fallout and is found in the environment in trace quantities. Finally, all strontium-89 results in 1980 were <3.8 pCi/1, in agreement with 1976, 1977, 1978, and 1979 measurements.

No significant changes were seen_ in strontium-90 levels in milk and were similar to those otserved in 1979. This absence of an effect is consistent with the low initial production of these isotopes in nuclear explosions (Eisenbud, 1963). Also no other gama-emitting isotopes, except potassium

-40, were detected in any of the milk samples. This is consistent with the finding of the National Center for Radiological Health that most radiocontaminants in feed do not find their way into milk due to the selective metabolism of the cow. The common exceptions are radioisotopes of potassium, ccsium, strontium, barium, and iodine (National Center for Radiological Health,1968).

l In summary, the milk data for 1980 show no radislogical effects of the Plant operation, but tne presence of strontiam-90 in milk samples

- does exhibit a long range residual effect of previous atmospheric nuclear tests. Also, presence of iodine-131 in t so milk samples exhibits short range effect of the recent nuclear tert conducted 16 October 1980.

Drinking Water In drinking water from the City of Red Wing well, no tritium was detected.

Results ranged from <160 to <390 pC1/1. As with the other well water samples, all analyses for gamma-emitting isotopes yielded results below detection limits. Gross beta averaged 11.8 pCi/1 and was similar to the level observed in 1979 (10.5 pCi/1).

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HAZLETON ENVIRONMENTAL SCIENCES River Water At the upstream collection site, quarterly composite tritium levels ranged from <130 to <390 pCi/1 and were similar to the range observed in 1979 (<150 to 340 pCi/1).

At the downstream site (Lock and Dam #3), quarterly composite tritium levels ranged from 130 to 300 pC1/1. The differences in levels between upstream and downstream samples were not significant.

Analyses of river water were also made for gamma-ronitting isotopes, strontium-89, and strontium-90. All gamma-emitting isotopes and strontium

-89 were below detection limits. Strontium-90 was detected in one down-stream sample (1.3 pC1/1) and was barely above the LLD level of 1.1 pCi/1. There was no indication of a Plant effect.

Well Water At the control well P-25, Kinneman Farm, tritium levels averaged 270 pCi/1, almost identical to the level observed in 1979 (260 pCi/1). For two of the indicator wells (P-8, Kinney Store, and P-10, Lock and Dam #3) no tritium was detected above LLD level of 280 pCi/1 in any of the analyses. The results ranged from <120 to <280 pCi/1 and were consistent with the results obtained in 1979. At the remaining indicator well (P-9, Plant Well #2), tritium was detected in three quarterly samples and ranged from <180 to 520 pCi/1, averaging 420 pCi/1, exactly the same as in 1979. This is about 150 pCi/1 above the control level of 270 pCi/1.

The difference between the Plant well and the control well was not i statistically significant since uncertainty in the measurement is about at the same magnitude as the difference. The highest tritium activity detected in the well (520 pCi/1) was about forty times lower than the annual average concentration allowed by the EPA National Interim Primary Drinking Water Regulation. (40 CFR 141) and was 0.005% of maximum

,- permissible concentration for tritium above background level in un-restricted areas (3,000,000 pCi/1). Gamma-emitting isotopes were in all I

cases below detection limits.

An investigation was begun in May 1978 to determine ground water flow

patterns in the affected area. This investigation showed a general slope from the Mississippi River to the Vermillion River past the immediate area of Plant Well #2. This would indicate that surface water recharge from the Mississippi River may be intercepted by Well #2. Several plant water system sampling locations have been established in order to monitor possible migration of activity to Well #2. So far this investigative effort is inconclusive.

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HAZLETON ENVIRONMZNTAL SCIENCES Tritium is released by the Plant to the river; however, tritium is also produced by nuclear weapon tests and by cosmic radiation and brought to the ground by precipitation. At this point in time, it is not at all evident which source or sources may be contributing to the negligible -

elevated tritium levels in Well #2.

Crops Cabbage samples were collected on 2 September 1980, and analyzed for iodine-131. Corn samples were also collected on 2 September 1980, and analyzed for gamma-emitting isotopes. All results, except for potassium

-40, were below detection limits. There was no indication of a Plant effect.

l Natural Vegetation j Natural vegetation was collected on 6 May and 2 Sep+. ember 1980. No-iodine-131 was observed in either collection. Trace amount of cesium-137 was detected in one sample collected in September at the control location P-25. Also, one sample contained trace amounts of zirconium-95, reflecting the long range deposition effect from previous atmospheric nuclear tests.

All other gamma-emitting isotopes, except bery111um-7, which is constantly 1 produced ini the upper atmosphere by cosmic rays, and naturally-occurring  !

potassium-40 were below detection limits. Thus, no Plant effect is  :

i ndicated.

Topsoil l Topsoil was not collected in 1980. In accordance with Technical Specifi-l cations, soil is collected every three years. The last collection was l made in 1979.

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! Fish 1 Fish samples were collected in May, June, and September 1980. There was l no significant difference between upstream and downstream results. There was no indication of a Plant effect. ]

I Aquatic Insects and Periphyton i

l Aquatic insects (macroinvertebrates) and peripnyton were collected on 3 June and 9 September 1980. The samples were analyzed for strontium-89, strontium-90 and gamma-emitting isotopes. Strontium-89 and all gamma

-emitting isotopes were below limits of detection. Mean strontium-90 l

1evel was at the LLD level in upstream samples (0.03 pCi/g wet weight) ud 0.06 pCi/g wet weight in downstream sample. The difference between 13 k

HAZLETON ENVIRONMENTAL SCIENCES the downstream and upstream samples was not statistically significant since uncertainty in the measurement is about at the same magnitude as the difference. No Plant effect was indicated.

Aquatic Vegetation Aquatic vegetation was collected on 30 June and 9 September 1980 and analyzed for gamma-emitting isotopes. All results, except for potassium

-40, were below detection limits. No Plant effect was indicated.

Bottom and Shoreline Sediments Sediment collections were made on 3 June and 9 September 1980. The samples were analyzed for strontium-90 and gamma-emitting isotopes.

Strontium-90 was detected in one control sample (0.034 pCi/g dry weight) and in two indicator samples (0.013 pC1/g dry weight). Cesium-137 was detected in one control sample and one indicator sample. Distribution and ratios for cesium-137 were similar to those for strontium -90.

The only other gamma-emitting isotope detected was naturally-occuring potassium

-40. No Plant effect was indicated.

C1ams A Special collection of clams was made 15 September 1980 in the vicinity of the site. The sample was analyzed for gross beta and gamma-emitting isotopes. Gross beta measured 1.45 pCi/g wet weight. All gamma-emitting isotopes were below detection limits. No Plant effect was indicated.

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HAZLETON ENVIRONMENTAL SCIENCES j 5.0 TABLES i

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Table 5.1 Sample collection and analysis program,1980. Prairie Island Collection Analysis loCdtfons Type and Type (and No. Codes (and Type)a Frequency b Frequency)C Medium P-1(C),P-2(C), C/Q Ambient gamma Ambient Radiation 7 (TLD's) P-3, P-4 l, Ambient gamma l

37 P-01A - P10A C/Q P-018 - P-15B y l p l

P-01S - P-06S N P-01(C)

P-1(C), P-2(C), GB, GS (MC of a Airbor-a particulates 7 C/W all locations)

P-3, P-4 z m

P-1(C), P-3, C/W I-131 2 Airborne iodine 3 5

P-4 :n E P-16 to P-18 G/M I-131 @

Milk 3 I

2 P-25(C),P-14 G/M I-131, Sr-89, m Sr-90, GS GS(MC), H-3(QC) r River water 2 P-5(C),P-6 G/W m

Sr-89 (QC) i Sr-90 (QC) h Z

P-11 G/W GB,GS(MC), n Drinking Water 1 H-3 (QC) @

i P-25(C), P-8 to G/Q H-3, GS Well water 4 P-10 P-25(C),P-24 G/A I-131 Edible cultivated 2 crops - green leafy vegetables

Table 5.1 (continued) Prairie Island Collection Analysis Locations Type and Type (and Medium No. Codes (and Type)a Frequencyb Frequency)c Edible cultivated 2 P-25(C), P-14 G/A GS crops - corn Natural Vegetation 3 P-25(C),P-14,P-15 G/SA I-131, GS Fish (two species, 2 P-5(C),P-6 G/SA GS edible portion)

Periphyton or 2 P-5(C), P-6 G/SA Sr-89, Sr-90 Macroinvertebrates GS Aquatic Vegetation 2 P-5(C), P-6 G/SA GS f 33 Bottom Sediment 2 P-5(C),P-6 G/SA GS, Sr-90 0 Shoreline Sediment 1 P-12 G/SA GS, Sr-90 h Topsoild 9 P-1(C), P-2(C) G/ETY GS, Sr-90 P-3, P-4, P-19 to r-P-23 m 0

a Location codes are defined in Table D-2. Control stations are indicated by (C). $

All other stations are indicators. O b Collection type is cooed as follows: C/ = continuous G/ = grab. Collection frequency is coded as follows: W = weekly, M = month'e, Q = quarterly, SA = semi-annually, A = annually, ETY = every three years.

c Analysis type is coded as follows: GB = gross beta, GS = gamma spectroscopy, H-3 = tritium, Sr-89 = strontium-89, Sr-90 = strontium-90, I-131 = iodine-131.

Analysis frequency is coded as follows: MC = monthly composite, QC = quarterly composi te.

dCollected in 1979. Next scheduled collecction is in 1982.

HAZLETON ENVIRONMENTAI. SCIENCES Table 5.2 Sampling locations. Prairie Island Code Typea Name Location P-1 C Station P-1 (Control-Af r) 16.5 mi 0 348*/NNW P-2 C Station P-2 (Control-Air) 10.9 mi 0 47*/NE P-3 Station P-3 (X/Q res, Comm-Air) 0.8 mi 0 313*/NW P-4 Station P-4 (X/Q-Air) 1.6 mi 0 129*/SE P-5 Upstream of Plant (1000') 0.6 mi 0 60*/ENE P-6 Lock & Dam #3 1.6 mi 0 129'/SE P-7b C Most Farm Well 11.4 mi 0 320*/NW P-8 Kinney Store 2.0 mi 0 280*/W P-9 Plant Well #2 (on-site) 0.3 mi 0 306*/NW P-10 Lock & Dam #3 Well 1.6 mi 0 129*/SE P-11 City of Red Wing (Drinking Water) 7.1 mi 0 135'/SE P-12 Recreational Area 3.4 mi 0 116*/ESE P-13b C Most Farm (Prescott) 11.4 mi 0 320*/NW P-14 Gustafscn Farm (X/Q-milk) 2.2 mi 0 168*/SSE P-15 Downwind Field 0.6 mi 0 162*/SSE P-16 A. Dosdahl Farm 2.5 mi 0 39*/NE P-17 Place Farm 3.5 mi 0 25*/NNE P-18 Birk Farm 3.5 mi 0 181*/S P-19 Commissary Point Park 1.0 mi 0 156*/SSE P-20 Meteorology Station 0.4 mi 0 296*/WNW P-21 Sturgeon Lake Access 0.4 mi 0 344*/NNW i P-22 Former TLD #14 Location 0.5 mi 0 230*/SW l P-23 Former TLD #15 Location 0.5 mi 0 184*/S l

P-24 H. Larson Residence (Nearest 1.6 mi 0 287*/WNW Garden)

P-25c C Kinneman Farm (Control-Milk, etc) 11.1 mi 0 331*/NNW P-26c Augustine Farm 5.7 mi 0 24*/NNE l P-27c Murphy Farm 2.8 mi 0 42*/NE P-01A Property f. ine North Sector. Sampler is on the side of the fence adjacent to corpt of Engineers public access parking area and facing

. the plant.

P-02A Property Line NNE Sector. Sampler at a corner of the property line fence near fle biology station.

P-03A Property Line South Sector. Sampler is adjacent the SE end of a guard rail along the road near a river pole.

18

1 1

HAZLETON ENVIRONMENTAL SCIENCES Table 5.2 (continued) Prairie Island Code Typea Name Location P-04A Property Line SSW Sector. Sampler is adjacent ot the NW end of a guard rail along the roadway next to a small access road.

P-05A Property Line SW Sector. Sampler is inside the fence area adjacent to a transmission tower.

P-06A Property Line WSW Sector. Sampler is inside the fenced area adjacent to a telephone junction box and south of an underground cable warning sign.

P-07A Property Line West Sector. Sampler is inside the fenced area about 75 feet North of the railroad entrance gate adjacent to a fence sign.

P-08A Property Line WNW Sector. Sampler is adjacent to the last power polw that serves the Meteorological station along the property line.

P-09A NW Sector. Sampler is in north west corner of the property fenced area, just inside the fence and facing the plant.

P-10A Property Line NNW Sector. Sampler is inside the fence west of the north entrance gate facing the plant adjacent to a transmission tower.

P-01B Thomas Killian North - Sector. Sampler is t , Residence adjacent to a power pole north of the driveway.

P-02B Ray Kinneman Farm NNE Sector. Sampler is south of the driveway adjacent to a telephone junction box.

19

HAZ1.ETObJ ENVIRONMENTAL SCIENCES Table 5.2 (continued) Prairie Island Code Typea Nane Location P-03B Wayne Anderson Farm NE Sector. Sampler is in l the front yard adjacent to l

a power pole facing toward the plant.

P-04B Nelson Drive (Road) ENE Sector. Sampler is adjacent to a power pole and a telephone junction box, about 15 feet south of the road.

! P-05B Country Road E near East Sector. Sampler is Goodwin Coulee Road north of Country Road E and about 300 ft. NW of the Goodwin Coulee Road (near a power pole that has a " Danger High Voltage" sign on it and about 25 ft. NW of the Richard Enberg mail box).

P-06B William Hauschildt ESE Sector. Sampler is Residence between a power pole and telephone junction box on i the east side of the

driveway.

I P-07B Red Wing Service Center SE Sector. (North l Highway 61 on Tyler Road) l Sampler is adjacent to a corner transmission pole and the Railroad right-of-way close to a

, chain link fence.

P-08B David Wnuk Residence SSE Sector. Sampler is on j the west edge of property adjacent to a telephone

. box. Pole is opposite a new bridge on the east sida of Highway 19.

P-09B Highway 19, South of 61 South Sector. Sampler is adjacent to a pole support .

ing a telephone junction box and opposite a new bridge on the east side of highway 19.

20 i

HAZLETON ENVIRONMENTAL SCIENCES Table 5.2 (continued) Prairie Island Code Typea Name Location P-10B Cannodale Farm . SSW Sector. Sampler is (Lesson Lane-James Byron) adjacent to a corner fence post and near a " Speed Limit 30" road sign.

P-118 Wallace Weberg Farm SW Sector. (Farm is on top of the bluff). Sampler is adjacent to a power pole and the telephone junction box facing the plant (ease of driveway).

P-12B Ray Gergen, Jr. Farm WSW Sector. Sampler is north of driveway in the farmyard on the east end of a storage shed facing the plant.

P-13B Thomas O'Rourke Farm West Sector. Sampler is adjacent to a power pole and a telephone junction box outside a stock fence area.

P-14B David J. Anderson Farm NW Sector. Sampler is near the front year south

, of a red cedar tree (not l located in the main road for protection).

P-15B Holst Farm NNW Sector. Sampler is r Station east of residence near a

' corner post of a fenced area.

, P-01S Federal Lock & Dam #3 SE Sector. Sampler is

! north of the fenced air sampling station (#4) and facing the plant.

- P-02S Charles Suter Residence SSE Sector. Sampler on the north side of a power pole in the farm yard and facing the plant.

P-03S Carl Gustafson Farm SSE Sector. Sampler is

! near the north side of the

! road in the last curve before the farmyard.

(Close to the corner power pole and a fence post).

l 21

HAZLETON ENVIRONMENTAL. SCIENCES Table 5.2 (continued) Prairie Island Code Typea Name Location P-04S Near Richard Burt SW Sector Sampler is Residence to a tree about 15 feet away from the curve in the road.

P-05S Xenney Store - West Sector. Sampler is Trailer Park at the north end of a redwood fence and adjacent to a telephone junction box.

P-06S Earl Flynn Farm WNW Sector. Sampler is on the east side of the house adjacent to a hyge stump and facing the plant.

P-01C Robert Kinneman Farm NNW Sector. Sampler is about 250 ft. east of the residence adjacent to a corner fence post and facing the plant.

a"C" denotes control location. All other locations are indicators.

bP-13 discontinued after March 1978.

cP-25 added in April 1978.

dP-26 and P-27 added in July 1978 (Goat's Milk).

r 22

l Table;5.3 Missed collections and analyses,1980; Prairie Island NGP All required samples collected and analyzed except the following:

Coll. Date Sample Analysis Location or Period Comments Thermoluminescent Ambient P-1 3rd quarter TLD bulbs and Dosimeters (TLD's) gamma 1980 cards were lost I to thieves in the field.

Airbarne Gross Beta P-2 1-21 to 1-29-80 No sample due to Z particulate pump malfunction. ,

Z n

r i

M 0

m Z

n m

. M

. . , i Table 5.4 Environmental Radiological Monitoring Program Summary.

Name of facility Prairie Island Nuclear Generating Plant Docket No. 50-282, 50-306 Location of facility Goodhue, Minnesota _ Reporting period January-December 1980 (County, state)

Indicator Location with Highest Control Samp h Type and Locationg Annual Mean Locations Number of Type Number of Mean(F) Mean(F) Hean(F) Non-routine

_ (Units) Analysesa LLDb RangeC Locationd Range Range Results' TLD Gamma 15 1.0 13.3 (8/B) P-2 Station P-2 18.4 (4/4) 15.9 (7/7) 0 (nres/91 days) (11.3-15.3) 10.9 al 9 47' NE (14.7-20.4) (11.9-20.4)

TLD Gamma 40 3.0 11.2 (40/40) P-05A, Property 12.4 (4/4) (See control 0 (ares /91 days) (5.8-14.0) Line. SW Sector (9.6-13.7) below) y (Inner Ring. 'b General Area at N Site Boundary) f-m ILD Gamma 60 3.0 13.5 (60/60) P-048 Nelson Drive 14.9 (4/4) (See control 0 4 (ares /91 days) (8.0-18.5) Road, ENE Sector (10.4-18.4) below) 0 (Outer ring. 4 2

-5 alles m distant). Z N TLD Gamma 24 3.0 11.4 (24/24) P-035, Carl Gustafsor 13.0 (4/4) (See control 0 -

• (arem/91 days) (7.1-15.6) Fam, SSE Sector (8.6-15.6) below)

(Special Interest Areas) Z TLD Gamma 4 3.0 None P-01C-R. Kinneman 13.2 (4/4) 13.2 (4/4) O m (ares /91 days) Farm. NNW Sector (10.7-14.7) (10.7-14.7) Z (control) g f-Airborne GB 155 0.001 0.032 (104/104) P-1, Station P-1 0.034 (52/52) 0.033 (103/103) 0 (A Particylates (0.009-0.158) 16.5 al 9 348' NNW (0.012-0.113) (0.010-0.113) 0 (pC1/m3 ) P-4. Station P-4 0.034 (52/52) m 1.6 al 9 129* SE (0.011-0.158) None 0 Z O

GS 12 m (n

Be-7 0.008 0.091 (12/12) NAf - None 0 (0.068-0.165)

Mn-54 0.0026 <LLD - - None O Co-58 0.0028 <LLD - - None O Co-60 0.0023 <LLD - - None 0 Zn-65 0.0060 (LLD - -' None O Nb-95 0.0019 0.0075 (2/12) NA - None 0 (0.004-0.011)

. . o i Table 5.4 (Continued)

Name of facility Prairie Island Nuclear Generating Plant Indicator Locatloc *ID TUghest Control Sample Type and Locationg Annual Mean Locations Number of Type Number of Mean(F) He'asTrl a Mean(F) Non-routine (Units) _

Analysesa ILDb RangeC Locationd Range Range Results' Airborne 4.'-95 0.0100 <LLD - - None 0 Particulates None 0 (pCl/m3) Ru-103 0.057 0.006 (1/12) NA -

(cont'd) -

Ru-106 0.0248 <tLD - - None O Cs-134 0.0023 <LLD - - None 0 y Cs-131 0.0020 <t L D - - None 0 Ba-140 0.W64 <tLD - - None O La-140 0.0056 <tLD - - None 0 0 Z

Ce-141 0.0023 0.009.(2/12) NA - None 0 g (0.007-0.011) g Ce-144 0.0110 <t L D - - None 0 b N B i

l Airborne 1-131 156 0.07 <LLD - - <LlD 0 0 lodine Z l

l (pCl/m3 ) $

m Milk I-131 69 0.25 5.4 (1/57) P-16 Dosdehl Fam, 5.4 (1/57) 0.4 (1/12) 0 Z (pC1/1) - 2.5 al 9 39' NE - -

3.8 <LLD 0 I Sr-89 24 <L L D - -

(A Sr-90 24 1.0 2.8 (12/12) P-14 Gustafson Fam 2.0 (12/12) J.6 (12/12) o n 2.2 al 9 168* SSE (1.9-3.8) (2.2-4.9) jji Z

GS 24 n m

K-40 100 1310 (12/12) P-14 Gustafson Fann 1310 (12/12) 1260 (12/12) U Up

(!!60-1470) 2.2 al 9 168*55[ (1160-1410) (1150-1430)

Cs-134 15 (L L D - - (LLD 0 Cs-137 15 <L LD - - <t LD 0 P;- %0 15 <t L D - - <L L O O L a-140 15 <t L D - - <! L D 0 i Drinting Water CB 12 I 11.8 (12/12) P-Il City of Red Wing 11.8 (12/12) None 0 (ptt/1) (8.6-16.6) 7.1 al 9135' SE (1.6-16.6)

H-3 4 390 <L L D - - None O GS 12

Table 5.4 (Continued)

Name of facility Prairie Island Nuclear Generating Plant Indicator Location wil R ) est control Sample Type and Locationg Annual Mean Locations Number of Type Number of Mean(F) Mean(F) Mean(F) Non-routine (Units) Analysesa LLDb RangeC Locationd Range Range Results' Drinking Water Mn-54 15 <LLD - -

None 0 (pC1/1)

(cont'd) Co-58 15 <LLD - -

None O Co- 4 15 (LLD - -

None 0 Zn-65 30 <LLD - -

None O Mb-95 15 <tLD - -

None 0 7

Zr-95 15 <LLD - -

None O Cs-134 15 <LLD - -

None 0 m

-4 Cs-137 18 <tLD - - None 0 0 Z

Ba-140 15 <LLD - - None 0 m

La-140 15 <LLD - -

None 0 Z I

ro Ce-144 50 <LLD -

None 0 Il m .

O R;wer Water H-3 8 390 <LLD - - <tLD 0 Z (pC1/11 Sr-89 8 1.8 <LLD <t LD 0

{

m Sr-90 8 1.1 1.3 (1/4) P-6 Lock 8 Das #3 1.3 (1/4) <LLD 0 1.6 at 9 129* SE -

)

f*

GS 24 m O

Mn-54 15 <tLD - -

<LL D 0 y Co-58 15 <tLD <LLD 0 Z

g M

Co-60 15 <LLD - -

<tLD 0 gl Zn-65 30 <LLD - -

<tLD 0 Nb-95 25 <LLD - -

<LLD 0 Zr-95 19 <LLD - -

<LLD 0 Cs-134 15 <LLD - - (LLD 0 Cs-137 18 <ttD - -

<LLD 0 Ba-140 15 <tLD - -

(LLD 0 La-140 15 <LLD - -

<t L D 0 Ce-141 90 <LLD -

<tLD 0

Table 5.4 (Continued)

Name of facility Pralrle Island Nuclear Generating Plant Indicator Location with llTghest Control Sample Type and Locationg Annual Mean Locations Number of Type Number of Mean(F) Mean[F) Mean(F) Non-routine (Units) Analysesa Llob RangeC Locationd Range Range Results' Well Water H-3 16 280 420 (3/12) P-9 Hant idell f 2 420 (4/12) 370 (1/4) 0 (pCl/l) (350-520) 0.3 mi e 306* NW (350-520) -

GS Mn-54 15 <LLD - - (LLD 0 Co-58 15 <tLD - - <tLD 0

. Co-60 15 (LLD - -

<LLD 0 I Zn-65 30 <LLD - -

<LLD 0 p Nb-95 15 <tLD - -

<LLD 0 0

Zr-95 26 <t LD - - (LLD 0 Z Cs-134 15 (LLD - - <LLD 0 Cs-137. 18 <L LD - -

<LLD 0 I ro 3 N Ba-140 15 (LLD - -

<LLD 0 0 Z

La-140 15 (LLD - - <LLD 0 {

m Ce-144 90 (LLD - -

<LLD 0 g Crops-Cabba e 1-131 3 0.016 <tLD - - <tLD 0 D (pC1/g wet I lA Crops-Corn , 1-131 2 0.028 <LLD - -

<LLD 0 ()

(pCl/g wet) g GS 2 Z

Be-7 0.16 <LLD - -

<LLD 0 g K-40 0.5 2.11 (1/1) P-25 Kinneman Fam 2.2 (1/l) 2.17 (1/l) 0

- 11.1 at e 331* NNW - -

Mn-54 0.022 <LLD - - <LLD 0 Co-58 0.019 (LLD - - <LLD 0 Zn-65 0.036 (LLD - -

<LLD 0 Nb-95 0.019 <LLD - - <LLD 0 Zr-95 0.043 <tLD - -

<tLD o Ru-103 0.023 (LLD - - <LLO O Ru-106 0.15 <LLD - - <LLD 0

4 e

Ishle 5.4 . (Continued)

Name of facility Pralrle_lsland leuclear Generging Plant _

g.g g-- -.

gg- gggg ._

g- ----

Semple Type and 1.ocationg Annual '~~~~

Mean locations Number of Type 16 umber of Mean(f) ~ Me'a'iil rl -~ Mean(fI Non routine i jug) .. .Analy sets ggeb RangeC locationd .Rango _ ._ Hange Results' Crops Corn Cs 134 0.019 <li D ' - - <t t 0 0 (ptt/9dw)et)

(cont Cs 131 0.01) <llD - - <llU o

Be 140 0.068 <t t p - - <t L D 0 la.140 0.019 <t L D - - *Llu o Co 141 0.03l <llD - - <lt D 0 7

Co.144 0.16 <! 8 0 - - <t L D 0 m

Natural 1-131 6 0.031 st L D - - $14 D 0 Vegetation (pCI/g wet) Gs 6 0 2

Be 7 0.89 <tlD P 76 Kinneman l' arm 4.6 (t/7) 4.6 (1/2) O M 11.1 al 9 331' NW - -

7 K 40 0.3 6.3 (4/4) P 76 Kinneman l'are 6.3(2/7) 6.3 (2/7) 0 b (3.9 6.81) 11.1 al 9 331' NNW (6.6 1.0) (b 6 7.0) I ro O Mn 64 0.079 <t t u - ellD 2 0.019 1

Co bel il W - - etID 0 m Co.60 0.031 <t t p - - et t u o in.66 0.0$0

• LID - - <t l D u M

, IN 95 0.07h <t i D - - eiiD o O fr 95 m

0.040 0.10)(t/4) P IS Duwnwind field 0.101 ( t /4 ) ellD o 7 0.6 el W 167* $51 -

g lH Ru.lul 0.076 all D - - allu o m

Ru ID6 0.19 st L D - - ellD u C s l .14 0.071 ellD - - <ll D 0 Cs 131 0.013 *t t p P-75 Kinneman la m U.ubt (t/7) 0.0<,1 (t/7) o 11.1 al # 33f' NNW - -

tia 140 0.099 <t t o '- -

etID 0 ta 140 0.073

• tid - -

eliD 0 Co.141 0.043 <t t u - - <t t u o fe.144 u,77 <l t D - - et t u u

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4 Table 5.4 (Continued)

Name of facility Prairie Island Nuclear Generating Plant Indicator Location with Highest Control Sample Type and Locationg Annual Mean Locations Number of Type Number of Mean(F) Mean{F) Mean(F) Non-routine (Units) Analysesa LLDb RangeC Locationd Range Range Results' Bottom and Sr-90 6 0.012 0.013 (2/4) P-5, Upstream 1000' O.034 (1/2) 0.034 (1/2) O Shoreline 0.6 al 9 60* ENE - -

Sediments

., (pC1/g dry) GS 6 Be-7 0.45 <LLD - -

<LLD 0 K-40 1.0 11.3 (4/4) P-5 Upstream 1000' 13.3 (2/2) 13.3 (2/2) 0 (10.3-12.1) 0.6 at 9 60* ENE (11.3-15.3) (11.3-15.3) I Mn-54 0.034 <LLD - -

<tLD 0 N P

Co-58 0.074 <LLD - - <LLD 0 Co-60 <tLD -

<LLD 0

) 0.042 2n-65 0.067 <LLD - -

<tLD 0 M Z

Nb-65 0.084 <LLD - -

<LLD 0 $

B Zr-95 0.15 <LLD - - <LLD 0 0 Ru-103 0.11 <LLD - - (LLD 0 Ru-106 0.39 <LLD - -

<LLD 0 E Cs-134 0.051 <tLD - -

<LLD 0 F

Cs-137 0.036 0.062 (1/6) P-5 Upstream 1000' O.27 (1/6). 0.27 (1/6) 0 g 0.6 al 9 60*ENE - -

g Ba-140 0.098 (LLD - -

<LLD 0 La-140 0.031 <LLD - -

<LLD 0 Ce-141 0.16 <LLD - - <tLD 0 E Ce-144 0.22 (LLD - - <LLD 3 Class GB 1 0.5 1.45 (1/1) Site Area 1.45 (1/1) None 0 (pCf /g wet) - -

(Special Collecti;m) I k-40 0.43 <LLD - -

None O Mn-54 0.020 <LLD - -

None O Co-58 0.074 <tLD - - None O Co-60 0.015 <LLD - - None 0

Table 5.4 (Continued)

Name of f acility Prairie Island Nuclear Generating Plant Indicator Location with Highest Control Sample Type and Locationg Annual Mean Locations Number of Type Number of Mean(F) Mean(F) Mean(F) Non-routine (Units) Analysesa LLDb RangeC Locationd Range Range Results' Class Zn-65 0.088 <tLD - -

(llc 0 (pCf /g wet)

(Special .

Nb-95 0.070 <tLD - -

(LLD 0 Collection)

(cont'd) Zr-95 0.11 <LLD - -

<LLD 0 Cs-134 0.025 <LLD - -

<tLD 0 Cs-137 0.017 <LLD <LLD 0 g

Ba-140 0.045 <LLD - -

<LLD 0 La-140 0.028 <LLD - -

<LLD 0 O

Z aG8 = gross beta; BS = gamma scan.

b LLD = nominal lower Ilmit of detection based on 3 sigma error for background sample. m cMaan and range based upon detectable measurements only. Fraction of detectable measurements at specif fed locations is 7 Indicated in parentheses (F). 4 dLocations are specified (1) by name and code (Table 2) and (2) distance, direction, and sector relative to reactor site. 3

'Nonroutine results are those which exceed ten times the control station value. If no control station value is available. O r"o the result is considered nonroutine if it exceeds ten times the preoperational value for the location. 2 f Monthly composites from all locations were gamma scanned together. Thus the location with the highest annual mean $

cannot be identifled. m (R

9 m

Z n

m UI l

HAZLETON ENVIRONMENTAL. SCIGNCES

6.0 REFERENCES

CITED Eisenbud, M. 1963. Environmental Radioactivity, McGraw-Hill, New Yo rit , New Yorit, pp. 213, 275 and 276.

Hazleton Environmental Sciences Corporation. 1978. Sampling Procecures, Prairie Island Nuclear Generating Plant, Revision 9, 20 Octccer 1978.

. 1979a. Radiation Envirormntal Monitoring for Prairie Island Nuclear Generating Plant, Ccglete Analysis Data Tables, January -

. December 1978.

. 1979b. Radiation Environnental Fonitoring for Monticello Islano huclear. Ge anting Plant, Ceeplete Analysis Data Tables, January -

December 1978.

. 1980a. Radiation Environ = ental Monitoring for Menticello Nuclear Generating Plant, Complete Analysis Data Tables, January -

December 1979.

. 198Cb. hdiation Environmental Monitoring for Prairie Island huclear Generating Plant, Ccglete Analysis Data Tables, Janauary

- December 1979.

. 1981a. Radiation Envirormental Monitcring for Monticello kuclear Generating Plant, Ccaplete Analysis Data Tables, January - December 1980.

. 1981b. Radiation Envirormental Monitoring for Prairie Island huclear Generating Plant, Cceplete Analysis Data Tables, January - ,

December 1980.

NALCO Environmental Sciences, 1971a. Quality Control Program, Nuclear Sciences Section, Revision 3,15 May 1978.

. 1971b. Quality Control Procedures Manual, Nuclear Sciences Section, Revision 3,15 May 1978.

. . 1975. Quality Assurance Manual, Revision 6,18 April 1978.

. . 1977. Analytical Procedures Manual, Nuclear Sciences Section, Revision 1, 23 May 1978.

National Center for Radiological Health,1968. Radiological Health and Dei.4 Reports, Vol. 9, Number 12, 730-746.

Northern States Power Company. 1977. Prairie Island Nuclear Generating Plant, Annual Radiation Environmental Monitoring Report to the U.S.

Nuclear Regulatory Commission, January 1,1976 through December 31, 1976 (prepared by NALCO Environmental Sciences) Minneapolis, Minnesota.

33 1.

H A71 FTON ENVIRONMENTAL. SCIENCES

. 1978. Prairie Island Nuclear Generating Plant, Annual Radiation Environmental Monitoring Report to the U.S. Nuclear Regulatory Comission, January 1,1977 through December 31, 1977 (prepared by NALCO Environmental Sciences) Minneapolis, Minnesota.

. 1979. Prairie Island Nuclear Generating Plant, Annual Radiation Environmental Monitoring Report to the U.S. Nuclear Regulatory

. Comission, January 1,1978 to December 31,1978 (prepared by Hazleton Environ-mental Sciences). Minneapolis, Minnesota.

. . 1980. Prairie Island Nuclear Generating Plant, Annual Radiation Environmental Monitoring Report to the U.S. Nuclear Regulatory Comission, January 1,1979 to December 31,1979 (prepared by hazleton Environ-mental Sciences). Minneapolis, Minnesota.

U. S. Atomic Energy Comission. 1972. HASL Procedures Manual, Health and Safety Laboratory, New York, NY., 10014.

U. S. Department of Energy. 1978. Environmental Quarterly, January 1,1979.

Environmental Measurements Labcratory, New York, NY 10014.

U. S. Environmental Protection Agency, 1978. Environmental Radiation Data, Report 12 (April 1978) and Report 14 (October 1978). Eastern Environme . cal Radiation Fa-ility, Montgomery, Alabama.

U. S. Public Health Service. 1967. Radioassay Procedures for Environmental Samples, National Center for Radiological Health, Rockve'le, Maryland (Publ'c Health Service Publication No. 999-RH-27).

Wilson, D. W., G. M. Ward and J. E. Johnson. 1969. In Environmental Contamina-tion by Radioactive Materials, International Atomic Energy. Agency. p. 125. .

34

HAZLETON CNVIRONMINTAL CCIENC"JO Appendix A Crosscheck Program Results i

O l

• l A-1

HAZLETON CNVIRONM2NTAL SCIENCES Appendix A Crosscheck Proaram Results The Nuclear Sciences Department of Hazleton Environmental Sciences has partici-pated in interlaboratory comparison (crosscheck) programs since the formulation

- of its quality control program in December 1971. These programs are operated by agencies which supply environmental-type samples (e.g. , milk or water) containing concentrations of radionuclides known to the issuing agency but not to participant laboratories. The purpose of such a program is to privide an independent check on the laboratory's analytical procedures and to alert it to any possible problems.

Participant lacratories measure the concentrations of specified radionuclides and report them to the issuing agency. Several months later, the agency reports the known values to the participant laboratories and specifies control limits. Results consistently higher or lower than the known values or outside the control limits indicate a need to check the instruments or procedures used.

The results in Table A-1 were obtained through participation in the environ-mental sample crosscheck program for milk and water samples during the period 1975 through 1980. This program has been conducted by the U. S. Environmental Protection Agency Intercomparison and Calibration Section, Quality Assurance Branch, Environmental Monitoring and Support Laboratory, Las Vegas, Nevada.

The results in Table A-2 were obtained for thermoluminescent dosimeters (TLD's) during the period 1976,1977, and 1979 through participation in the Second, Third, and Fourth International Intercomparison of ' Environmental Dosimeters under the sponsorships listed in Table A-2.

l-l t

A-2

~ -

HAZLETON ENVIRONMENTAL. SCIENCES Table A-1. U.S. Environmental Protection Agency's crosscheck program, comparison of EPA and Hazleton ES results for milk and water samples, 1975 through 1980a.

Concentration in pCi/lb

. Lab Sample Date HES Result EPA Result Code Type Coll. Analysis 2oc 3 a, n=11 STM-40 Milk Jan. 1975 Sr-89 <2 0 15 Sr-90 73 2.5 75:11.4 I-131 99 4.2 101 15.3 Cs-137 76 0.0 75 15 Ba-140 <3.7 0 15.0 K(mg/l) 1470 5.6 1510t228 STW-45 Water Apr. 1975 Cr-51 <14 0

. Co-60 421 6 425263.9 Zn-65 487 6 497 74.7 Ru-106 505 16 497 74.7 Cs-134 385 3 400 60.0 Cs-137 468 3 450 67.5 STW-47 Water Jun. 1975 H-3 1459 144 1499 1002 l

STW-48 Water Jun. 1975 H-3 2404 34 2204 1044 STW-49 Water Jun. 1975 Cr-51 <14 0 l Co-60 344 1 350 53 i

Zn-65 330 5 327 49 Ru-1G6 315 7 325 49 Cs-134 291t1 304 46 '

Cs-137 387 2 378 57 l

l STW-53 Water Aug. 1975 H-3 3317 64 3200 1083

. STW-54 Water Aut. 1975 Cr-51 223 11 225 38 Co-60 305 1 307 46 Zn-65 289 3 281142 Ru-106 34625 279 57 Cs-134 238 1 256238 Cs-137 292 2 307 46 STW-58 Water Oct. 1975 H-3 1283 80 1203 988 STM-61 Milk Nov. 1975 Sr-90 68.9 2.1 74.6 11.2 I-131 64.6 3.8 75 15 Cs-137 75.6 20 75215 Ba-140 <3.7 0 K(Mg/l) 1435 57 1549 233 l

I A-3

i HAZLETON ENVIRONMENTAL. SCIENCES i

i Table A-1. (continued)

~

Concentration in pCi/lb Lab Sample Date HES Result EPA Result Code Type Coll. Analysis :25 c 3e , n=1d STW-63 Water Dec. 1975 H-3 1034 39 1002 972 STW-64 Water Dec. 1975 Cr-51 <14 0 Co-60 221:1 203:30.5 Zn-65 21526 201:30.2 Ru-106 171 9 181:27.2 Cs-134 198 2 202 30.3 Cs-137 152:4 151222.7 STW-68 Water Feb. 1976 H-3 1124 31 1080 978 STW-78 Water Jun. 1976 H-3 2500:44 2502:1056 STW-84 Water Aug. 1976 H-3 3097221 3100:1080 STM-86 Milk Spe. 1975 Sr-89 29:2.0 45:15 Sr-90 30:1.0 30:4.5 I-131 100 8.6 120:18 Ba-140 50:10.1 85:15 Cs-137 17 1.5 20 15 K(mg/l) - 1540:231 STM-91 Milk Nov. 1976 I-131 83:0.6 85:15 Ba-140 <4 0 Cs-137 12 1.7 11:15 K(mg/l) 1443 31 1510:228 STW-93 Water Dec. 1976 Cr-51 105:15 104 15 Co-60 <4 0 Zn-65 97 4 102 15 Ru-106 87 3 99:15

Cs-134 8524 93 15

. Cs-137 103 4 101 15 STW-94 Water Dec. 1976 H-3 2537:15 2300:1049 STM-97 Milk Mar.1977 I-131 55:2.5 51 15 Ba-140 <6 0 Cs-137 34:1 29 15 K(mg/l) 1520 35 1550:233 STW-101 Water Apr.1977 H-3 1690:62 1760 1023 A-4

Ha Ft FTON GNVIROB4MSNTAL CCIZNC23 Table A-1 (continued)

Concentration in pCi/lb _

Lab Sample Date HES Result EPA Result Code Type Coll. Analysis 2oc 23 e, n=1d

~

STM-130 Milk May 1977 Sr-89 38 2.6 44 15 Sr-90 12 2.1 1024.5 I-131 59 2.1 50 15 Ba-140 53 4.4 72 15 Cs-137 14 1.2 10 15 K(mg/l) 1533 21 1560 234 STW-105 Water Jun. 1977 Cr-51' <14 0 Co-60 29 1 29:15 Zn-65 74:7 74 15 Ru-106 64 8 62215 Cs-134 41 1 44 15 Cs-137 35:3 35:15 STW-107 Water Jun. 1977 Ra-226 4.7c0.3 5.1:2.42 STW-113 Water Aug. 1977 Sr-89 13 Oe 14 15 Sr-90 10 2e 10 4.5 STW-116 Water Sep.1977 Gross Alpha 12 6 10 15 Gross Beta 32 6 30 15 STW-118 Water Oct. 1977 H-3 1475 29 1650 1017 STW-119 Water Oct. 1977 Cr-51 132:14 153 24 Co-60 39 2 38 15 Zn-65 51 5 53215 Ru-106 63 6 74 15 Cs-134 30 3 30:15

, ^ Cs-137- -

26 1 25 15 l

STW-136 Water Feb. 1978 H-3 1690 270 1680 1020 STW-137 Water Feb. 1978 Cr-51 <27 0 Co-60 36 2 34 15 Zn-65 32 4 29 15 Ru-106 41 2 36 15 Cs-134 47 2 52 15 Cs-137 (2 0 A-5 I __

H A78 FTON CNVIRONM2NTAL GCGNC"]3 Table A-1. (continued)

Concentration in pCi/lb Lab Sample Date HES Result EPA Result Code Type Coll. Analysis 2oc 3 o, n=1d STW-138g Water Mar. 1978 Ra-226 5.4 0.1 5.5 0.6 Ra-228 NAf 16.722.5 STW-150 Water Apr. 1978 H-3 1250 220 2220 1047 STW-151 Water Apr. 1978 Gross Alpha 20 1 20 15 Gross Beta 56 4 59 15 Sr-89 19 2 21 15 Sr-90 81 10 4.5 Ra-226 NAf -

Ra-228 fMf -

H-3 112 12 0 Co-60 19 3 20 15 Cs-134 16 1 15 15 Cs-137 <2 0 STM-152 Milk Apr.1978 Sr-89 85 4 101 15 Sr-90 81 9 4.5 I-131 78 1 82 15 Cs-137 29 3 23 15 Ba-140 <11 0 K(mg/1) 1503 90 1500 225 STW-1549 Water May 1978 Gross Alpha 12 1 13 15 Gross Beta 21 4 18 15

! Jun. 1978 Ra-226 4.0 1.0 3.7 0.6 STW-1579 Water Ra-228 NAf 5.6 0.8

. STW-1599 Water Jul. 1978 Gross Alpha 19 3 22 6

. Gross Beta 2823 30 5 l- STW-162 Water Aug. 1978 H-3 1167 38 12302990 STW-165g Water Sep. 1978 Gross Alpha 41 55 Gross Beta 13 1 1025 A-6 p.

HAZLETON GNVIRONMINTAL. RCl2NC30 Table A-1 (continued)

Concentration in pCi/lb -

Lab Sample Date HES Result EPA Result Code Type Coll. Analysis 2oc 3 o, n=1d STW-167 Water Oct. 1978 Gross Alpha 19 2 19 15 l

Gross Beta 36 2 34 15 Sr-89 91 10 15 Sr-90 40 5 2.4 Ra-226 5.5 0.3 5.0 2.4 Ra-228 NAf 5.4 2.4 Cs-134 10 1 10 15 Cs-137 15 1 13 15 STW-170 Eater Dec. 1978 Ra-225 11.5 0.6 9.2 1.4 Ra-228 NAlefld 8.9 4.5

, STW-172 Water Jan. 1979 Sr-89 11 2 14 15

Sr-90 52 6 4.5 STW-175 Water Feb. 1979 H-3 1344 115 1280 993 STW-176 Water Feb. 1979 Cr-51 <22 0 Co-60 10 2 9 15

Zn-65 26 5 21

15 l Rn-106 <16 0 Cs-134 8t2 6 15 Cs-137 15 2 12 15 STW-178 Water Mar. 1979 Gross Alpha 6.3 3 10 15 Gross Beta 15 4 16 15 i STW-195g Water Aug. 1979 Gross Alpha 6.3 1.2 55 l Gross Beta 42.7 7.0 40 4

^

STW-193 Water Sep. 1979 Sr-89 5.0 1.2 3.0 1.5 -

Sr-90 25.0 2.7 28.0 4.5

.STW-196 Water Oct. 1979 Cr-51 13525.0 113218 Co-60 7.0 1.0 615 Cs-134 7.3 0.6 7 15 Cs-137 12.7 1.2 11 15 STW-198 Water Oct. 1979 H-3 1710 140 1560 1111 l

A-7 l

HAZLETON GNVIRONM2NTAL CCl2NC33 Table A-1. (continued)

Concentration in pCi/lb Lab

~

Sample Date HES Result EPA Result Code Type Coll. Analysis 2oc 3 o, n=1d

. STW-199 Water Oct. 1979 Gross Alpha 16.0 3.6 21 15 Gross Beta 36.3 1.2 49 15 l . Sr-89 10.7 0.6 12 15 Sr-90 5.7 0.6 7 15 Ra-226 11.1 0.3 11:5 Ra-228 1.620.7 0 Co-60 35.0 1.0 33 15 Cs-134 50.7 2.3 56 15 Cs-137 <3 0 STW-206 Water Jan. 1980 Gross Alpha 19.0 2.0 30.0 8.0 Gross Eeta 48.0 2.0 45.0 5.0 STW-208 Water Jan. 1980 Sr-89 6.1 1.2 10.0 0.5 Sr-90 23.9 1.1 25.5 1.5 STW-209 Water Feb. 1980 Cr-51 112 14 101 5.0 Co-60 12.7 2.3 '

11 5.0 Zn-65 29.7 2.3 25 5.0 Ru-106 71.7 1.5 51 5 Cs-134 12.0 2.0 10 5.0 Cs-137 30.0 2.7 30 5.0 STW-210 Water Feb. 1980 H-3 1800 120 1750 340 STk-211 Water Marc 1 1980 Ra-226 15.7 0.2 16.0 2.4 Ra-228 3.5 0.3 2.6 0.4 STW-215 Water April 1980 Gross Alpha NAf 98.0 24.5 Gross Beta NAf 100.0 5.0 Sr-89 3.7 0.6 4 5.0 i Sr-90 <1.0 0.001 0.1 l Ra-226 NAf 16.0 2.4 l - Ra-228 NAf 21.3 3.2 Co-60 10.0 1.0 65 Cs-134 14.0 1.0 85 Cs-137 21.7 1.5 18 5 STM-217 Milk May 1980 Sr-89 4.4 2.69 55 Sr-90 10.0 1.0 12 1.5 STW-221 Water June 1980 Ra-226 2.0 0.0 1.7 0.8 Ra-228 1.6 0.1 1.7 0.8 A-8

MA2LETON CNVIRONMENTAL SCGNCG3 Table A-1. (continued)

Concentration in oCi/l b Lab Sample Date HES Result EPA Result Code Type Coll. Analysis 22 cc 32, n=1d 5TW-223 Water July 1980 Gross Alpha 31:3.0 38:5.0 Gross Seta 44:4 35 5.0 STW-224 Water July 1980 Cs-137 33.9:0.4 35:5.0 Ba-140 <12 0 K-40 1350:50 1550:78 I-131 <5.0 0 STW-225 Water Aug. 1980 H-3 1280:50 1210:329 STW-226 Water Sept. 1980 Sr-89 22:1.2 24:3.6 Sr-90 12 0.6 15:2.6 STW-228 Water Sept. 1980 Gross Alpha NAf 32.0:8.0 Gross Beta 22.5:0.0 21.0 5.0 aResults obtained by the Nuclear Sciences Department of Hazleton Environ-mental Sciences as a participant in the environmental sample crosscheck program operated by the Intercomparison and Calibration Section, Quality Assurance Branch, Environmental Monitoring and Support Laboratory, U.S.

Environmental Protection Agency, { EPA), Las Vegas, Nevada.

ball results are in pCi/1, except for elemental potassium (K) data which are in mg/1.

cUnless otherwise indicated, the HES results given as the mean :2 standard .

deviations for three determinations.

dUSEPA results are presented as the known values : control limits cf 3 for n=1.

- eMean 2 standard deviations of two determinations.

f NA = Not analyzed.

9 Analyzed but not reported to the EPA.

~

A-9

r lable A-2. Crosscheck program results, themoluminescent dosimeters (TLD's).

mR Lab TLD Hazleton Average i 2a o Code Type Measurement Result Known (all 12a Value participants) 2nd International Intercomparisonb 115-2b CaF2:Mn Gamma-Field 17.011.9 17.lc 16.417.7 Bulb Gamma-Lab 20.814.1 21.3c 18.817.6 0

3rd International Intercomparisone Z 115-3e CaF2:Mn Gamma-Field 30.713.2 34.914.8f 31.513.0 k Bulb 5 P Gamma-Lab 89.616.4 91.7114.6f 86.2124.0 0 5

4th International Intercomparison9 h

115-49 CaF2:Mn Gamma-Field 14.111.1 14.lil.4f 16.09.0 i Bulb r-Gamma-Lab (Low) 9.311.3 12.212.4f 12.017.6 m n

Gamma-Lab (Iligh) 40.411.4 45.819.2f 43.9113.2_

a m

aLab result given is the mean i 2 standard deviations of three detenninations.

bSecond International.Intercomparison of Environmental Dosimeters conducted in April of 1976 by the llealth and Safety Laboratory (GASL), New York, New York, and the School of Public flealth of the Univeristy of Texas,llouston, Texas.

cValue determined by sponsor of the intercomprison.

dMean i 2 standard deviationsof results obtained by all laboratories participatin9 in program.

eThird International Intercomparison of Environmental Dosimeters conducted in summer of 1977 by Oak Ridge National Laboratory and the School of Public Ilealth of the University of Texas, llouston, Texas.

f Value i 2 standard deviations as determined by sponsor of the intercomparison.

9 Fourth International Intercomparison of Environmental Dosimeters conducted in sunsner of 1979 by the School of Public llealth of the University of Texas,llouston, Texas.

l

i HA2LETON CNVIRONMINTAL CCl"!NC'23 Appendix B Data Reporting Conventions l

l l

l l

t B-1

HA2LETON CNVIRONMENTAL CCGNCC3 f

Data Recortina Conventions ,

1. All activities are corrected to collection time.

2. Single Measuements -

Each single measurement is reported as follows:

~

x2s

. where x = value of the measurement; s=2e counting uncertainty (corresponding to the 95%

confidence level).

In cases where the activity is found to be below the lower limit of detection L it is reported as

<L .

Detection limits are based on 4.66o background counting uncertainties.

3. Duplicate measurements, the average result is reported as follows:

a. Individual results: ix 2s g

• 2 2 s2 Reported result: x2s where x = (1/2) (xg + x2) s=(1/2)1/s2+s2 I 1 2

b. Individual Results: <L1

<L2 Repokedresult: <L

^

where L = lower of Li and L2 B-2

HA2LETON ENVIRONMENTAL CCCNC O

c. Individual results: xts

<L Reported result: x + s if x < L;

<L otherwise

4. Unless otherwide indicated, the " cumulative average" for a location is the average of all measurements from the beginning of the current year through the date of the last entered result. "Less-than" values are ignored in the computation of the average. If all results are less-than values, the highest value is reported.

5. Unless othenvise indicated, the " previous average" for a location 1s the average obtained during the previous year.

6. In rounding off, the following rules are followed:

a. If the figure following those to be retained is less than 5, the figure is dropped, and the retained figures are kept unchanged. As an example,11.443 is rounded off to 11.44.

b. If the figure following those to be retained is greater than 5, the figure is dropped, and the last retained figure is raised by 1.

As an example,11.446 is rounded off to 11.45.

c. If the figure following those to be retained is 5, and if there i

are no figures other than zeros beyond the five, the figure 5 is dropped, and the last-place figure retained is increased by one of it

. is an odd number or it is kept unchanged if an even number. As an example,11.435 is rounded off to 11.44, while 11.425 is rounded off to 11.42.

e f

9 l

B-3 i

HAZLETON CNVIRONMZNTAL CCIONCCO l

I

Appendix C Maximum Permis'sible Concentrations of Radioactivity in Air and Water Above Background in Unrestricted Areas a

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C-1

HAZLETON ENVIRONMZNTAL CCIENCCO Table C-1. Maximum permissible concentrations of radioactivity in air and water above natural background in unrestricted areas.a Air Water Gross alpha 3 pC1/m3 Strontium-89 3,000 pCi/1 Gross beta 100 pCi/m3 Stronti um-90 300 pCi/1 Iodine-131b 0.14 pCi/rd Cesium-137 20,000 pC1/1 Bari um-140 20,000 pC1/1 Iodine-131 300 pCi/1 Potassium-40c 3,000 pCi/1 Gross alpha 30 pCi/1 Gross beta 100 pCi/1 Tritium 3 x 106 pCi/1 aTaken from Code of Federal Regulations Title 10, Part 20, Table II acd appropriate footnotes. Concentrations may be averaged over a priod not greater than one year.

bFrom 10 CFR 20 but adjusted by a factor of 700 to reduce the dose l

resulting from the air-grass-cow-milk-child pathway.

cA natural radionuclide.

I l

I C-2 1

- - . - - v-- --