ML071300603

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E-Mail from D. Gray of Entergy to J. Noggle of USNRC, Regarding Pre-Operational Studies
ML071300603
Person / Time
Site: Indian Point  Entergy icon.png
Issue date: 01/26/2007
From: Deborah Gray
Entergy Nuclear Operations
To: Noggle J
NRC/RGN-I/DRS/PSB2
References
FOIA/PA-2007-0166
Download: ML071300603 (33)
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Text

{{#Wiki_filter:j*arnesN.I-6q - RE: Pre-Operafional Studies _ Pagej1 From: "Gray, Dara F" <DGray@entergy.com> To: "James Noggle" <JDN @nrc.gov> Date: 01/26/2007 2:07:55 PM

Subject:

RE: Pre-Operational Studies Jim Here's the 1959 reports Dara Gray, REM Chemistry/Environmental Indian Point Energy Center (914) 736-8414 DGray@ Entergy.com This e-mail a ny attachments ther are intended only for the use by the addressee(s) ed herein contain proprietary and confidential information. If you are theih ended recipient of this e-mail, you are hereby notified that a semination, distribution, or copying of this e-mail, and any a chmen ereto, is strictly prohibited. If you have received thi -mail in error, p se immediately notify me by telephone an ermanently delete the inal and any copy of any e-mail and any p r tout thereof.

Original Message -----

From: James Noggle [1] Sent: Friday, January 26, 2007 10:01 AM To: Gray, Dara F

Subject:

Re: Pre-Operational Studies

Dear Dara,

Though the info even predates some weapons testing fallout, still it represents a complete review of IPEC enironmental sampling data, so I would like an e-mail copy of this info. Also, what about the intervening years? 1958-1973?

Regards, Jim

>>> "Gray, Dara F" <DGray@entergy.com> 1/26/2007 6:24 AM >>> Hi Jim We did actually find 'Pre-Operational Environmental Surveys of Radioactivity in the Vicinity of Indian Point Power Plant" for 1958 and 1958. Although water and fish were included, given the era - the only measurements were gross alpha and gross beta. So, I don't believe this will be of much help but if you want copies let me know. I am still

!Ja es o e -RE: Pre-Operational Studies......... Page2 looking for any other historical baseline data to be found. Dara Gray, REM Chem istry/Environmental Indian Point Energy Center (914) 736-8414 DGray@ Entergy.com This e-mail a any attachments t rt oar intended only for the use byh drsse~)nn e ee.adcnanporeayadcnieta a n /a n inom to.I0 o rNo

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PRE-OPERATIONAL ENVIRONMENTAL SURVEY IN THE VICINITY OF INDIAN POINT NUCLEAR POWER PLANT 1959 TEST BUREAU METER AND TEST DEPARTMENT CONSOLIP1TED EDISON COMANY OF NEN YORK, INC.

PRE-OPERATIONAL ENVIROD4MNT SURVEY OF RADIOACTIVITY IN TIE VICINITY OF INDIAN POINT NUCLEAR POWER PLANT 1959 This report describes the results obtained in the pre-opera-tional environmental survey of 1959 which was a continuation of the survey conducted during 1958. The survey methods and the 1958 results were previously reported. These measurements are being continued in order to show the level of radioactivity existing before the reactor goes into operation. The results should therefore show any variation in activity that may be expected from natural sources, fallout from bomb tests or other sources, in the vicinity. Seven sites on the west side of the Hudson River in Orange and Rockland Counties were added in 1959. In addition to air and water, samples of vegetation, soil and a limited number of biological specimens were collected. A total of 680 samples of all media was obtained and checked for radioactivity. The gross beta activity of the air, water and vegetation samples collected during 1959 show a marked reduction over 1958. Other surveys have also shown this trend and have attributed it to the cessation of nuclear weapons testing. The results of the survey show the activity in the vicinity of Indian Point to be low and comparable to that existing at other locations in the country. This data will be of much use as a comparison with the data obtained atter the reactor goes into operation. Complete results of the tests, together with a descrintion of the sampling locations, are given in Sections I and II. The radioactivity of individual sanples.are shown on a monthly basis so that long term trends become more apparent. On these charts the collection date of the individual samples are not given but are shown in approximate sampling order for ease of presentation. Section III contains two reports of investigations conducted in 1959 in addition to the routine survey. One of these describes tests male to determine the Strontium 90 content in soil sample's and the other pertains to measurements of radon in well water.

Results of the environmental survey in this area performed by the Now York State Department of Health were published in a report dated November, 1959 and are not shown herein. Near the end of the year it became apparent that the radioactivity of the environment throughout the survey area was so uniform that samples taken at the plant site would be representative of the entire region and the program was curtailed by eliminating air and water collections at the sampling stations off the Indian Point Plant. The 1960 survey will be conducted on the following sampling schedule: Continuous air particulate at Indian Point Fallout collection at Indian Point Weekly collection of Hudson River water Weekly collection of drinking water from four sources Weekly collection of surface water from Indian Point Lake Monthly collection of well water from Indian Point and Verplanck Vegetation collection from each sampling station in June, August, and October Soil collection from each station in July A. K. Joecks wfn.rr Test Engineer

SAMPLING LOCATIONS The locations chosen to sample air, water, soil and vegetation are shown on the map of the Indian Point area designated as Plate 1. Additional test sites were added for the 1959 survey covering an area west of the Hudson River in both the Rockland and Orange Counties. The geographical locations circled and numbered on the map are listed in Table I which describes the types of samples collected periodically.

SECTION I SAMPLING LOCATIONS I:-I

TABLE I SAMPLING LOCATIONS WESTCHESTER COUNTY SAMPLING STATION NO. GEOGRAPHIC LOCATION SAMPLES COLLECTED 1 Indian Point Plant Site Bleakley Ave., Buchanan 2 Peekskill Fuel Co. 6th St & Hudson River Verplanck 3 Flood Gate Dock Kings Ferry Road and Lake Meahagh, Verplanck .4 Cruger Unit Substation Rt. 9 & Railroad Ave., Crugers Park, Cortlandt 5 Chimney Corner Restaurant Rt. 9 and Furnace Dock Rd., Cortlandt 6 Valeria Home, Furnace Dock Rd and Furnace Woods Rd., Furnace Woods 7 Hunterbrook Unit Substation, Old Crompond Rd., & Hunterbrook Rd., Yorktown Mohegan Unit Substation Lexington Ave., Mohegan Lake 9 Algonquin Gas Metering Station, Crompond Rd., & Croton Ave., Crompond Air, soil, vegetation, fish, Hudson River water, local pond and well water, drinking water. Air, soil, vegetation, Hudson River water. Air soil, vegetation, fish, water from Lake Meahagh and Hudson River. Air, soil, vegetation, water from local pond. Air, soil, water from Pond. Air, soil, water from Pond. vegetation, Furnace Dock vegetation Dickerson Air, soil, vegetation, water from Lake Mohansic. Air, soil, vegetation, water from Mohegan Lake. Air, soil, vegetation.

TABLE I (CONT',D) SAMPLING LOCATIONS (CONT'D) WESTCHESTER COUNTY (CONT'D) SA14PLING STATION NO. GEOGRAPHIC LOCATION SAMPLES COLLECTED 10 Citron Upholstery Co., Air, soil, vegetation.

  • Crompond Rd., and Lafayette Ave.,Cortlandt 11 Peekskill Garage Air, soil, vegetation, Main St & Hamilton water from Peekskill Ave., Peekskill Reservoir.

12 Peekskill Gas Holder Air, soil, vegetation, Pemart Ave. & Water Hudson River water. St., Peekskill 13 Esso Gas Co., Air, soil, vegetation, Roa Hook Rd., & Hudson River water. Hudson River, Cortlandt 14 Camp Smith Air, soil, vegetation, Rt. 6, Cortlandt water from pond, well and drinking water. 15 National Guard Air, soil, vegetation, Armory, Washington water from Loundsbury St.and Welcher Ave., Pond. Peekskill 16 Mt. Kisco Gas Holder Air, soil, vegetation. Suttons Row and Bedford Rd., Mt. Kisco 20 Millwood Substation Air, soil, vegetation, Quaker St & water from Still Lake. Millwood Rd., Milwood

inUiiJL~E~V1U~Ui TABLE I (CONT7"D) SA14PLING LOCATIONS (CONT'D) WESTCHESTER COUNTY (CONT'D) SAMPLING STATION NO, 21 23 24 GEOGRAPHIC LOCATION Ossining Substation Market and Hill St., Ossining Croton Unit Sub-station Rt. 9, Croton-on-Hudson Yorktown Substation, Taconic Pkway and Croton Dam Rd., Cortlandt SAMPLES COLLECTED Air, soil, vegetation, Hudson River water and drinking water. Air, soil, vegetation, Hudson River water and drinking water. Air, soil, vegetation, water from New Croton Reservoir. ROCKLAND COUNTY 30 31 32 33 34 Rockland Fuel Co., Haverstraw U. S. Gypsum Co., Grassy Point Algonquin Metering Station, Rt. 210 Cedar Flats Lovett Generating Station, Rockland and Orange, L. & P. Co., Tompkins Cove Barneyts Tavern Jones Point Air, soil, vegetation, Hudson River water and drinking water. Air, soil, vegetation, Hudson River water, well and drinking water. Air, soil, vegetation, local drinking water. Air, soil, vegetation, Hudson River water. Air, soil, vegetation, Hudson River water and drinking water from well.

W 1 11,111sming1j, 2 - ---- - 'M 11111111111911, M11100115111i MIMMXV" R.- R.F.- w-, -1515"Fimmmoom TABLE I (CONT'D) SAMPLING LOCATION (CONT'D) ORANGE COUNTY SAMPLING STATION NO. 35 36 GEOGRAPHIC LOCATION Anthony Wayne Recreation Park Bear Mountain Park Perkins Memorial Bear Mountain Park SAMPLES COLLECTED Air, soil, vegetation, water from Hessian Lake. Air, soil, vegetation, water from Hessian Lake. PUTNAM COUNTY 41 42 44 Mom's Rbstaurant Rt. 9D, Manitou Highland Country Club Rt. 9D, Garrison Tony's Garage Rt. 301 Nelsonville Adams Corner Substation Peekskill Hollow Rd., Adams Corner Air, soil, vegetation, drinking water from well and water from Hudson River Air, soil, vegetation, water from pond, Hudson River water, spring water and well drinking water. Air, soil, vegetation, Hudson River water and drinking water. Air, soil, vegetation, water from Lake Peekskill and well.

SECTION II RESULTS OF MEASURDEMNTS NOTE:

1.

Counting errors are based on a 95% confidence level.

2.

All samples were measured approximately 48 hours after collection. 3, All samples-were checked for alpha decay but no measurable activity was noted after the 48-hour hold-up period. I, ii

RESULTS OF MEASUREMENTS Air Particulate The collection and measurement of air particulate was continued through 1959 in approximately the same manner as in 1958. On Plate 2 is shown the activity of particulate collected in millipore filters at the plant site measured 48 hours and 60 days after collection, The results obtained during 1958 are also shown on this chart to point out the decline in radioactivity since the cessation of weapons testing. Records of wind direction and velocity, at a point 100 feet above grade at the plant site, were obtained and are on file, A continuous air monitor and wind recorder in the mobile monitor survey unit were in operation at the sampling stations throughout the year. As in 1958, the unit was operated at a station for three or four days and then moved to another location, At the completion of its stay at a station, the filter paper was removed from the air mcnitor and the activity measured in the laboratory. The results of these measurements are given on.Plate 3. An examination of the continuous air monitor charts showed that in 1959 the number of radioactivity increases due to temperature inversions occurred on 75 nights as compared to 62 nightly increases during the nine months of monitoring in 1958. The report for 1958 attributed these excursions to temperature inversions and it was pointed out that the wind velocity records showed no air movement during these periods. A similar wind condition existed during 70 of these nights in 1959, but during the other five nights it was observed that a mild breeze was blov:ing from the Camp Smith area to the station where the monitor was located. The records further show that when the wind direction shifted slightly, the radioactivity decreased to normal. It is felt that the uranium deposits reputed to exist in the Camp Smith region produce the radon which causes this phenomenon.

WATER SAMPLES Plates 4, 5, 6 and 7 show the results of the gross beta activity obtained from Hudson River water, drinking water and surface waters. The drinking water, which is collected weekly, consists of grab samples taken from reservoirs and tans. Additional water samples were collected randomly and include samples from springs and deep wells. The surface waters show a drop in activity from that in 1958, which again is probably due to cessation of atomic weapons testing. The Hudson River samples show no significant changes. As is to be expected, the deep well water samples do not show the influence of weapons testing. SU1MMARY OF MEASURED GROSS BETA ACTIVITY MEDIUM' Hudson River Drinking Water Weekly Collection Drinking Water Random Collection Surface Water NO. OF SAIITLES GT.OSS ACTIVITY 4INIUM N

  • *YA *,U. AVERAGE UNITS 66 Microcuries per Milliliter X 10 -9 136 Microcuries per Milliliter X 10-9 36 Microcuries per Milliliter X 10-9 103 Microcuries per Milliliter X l0-9 Less Than 1 Less Than 1 Less Than 1 Less Than 1 180t80 901 5 4010 160+10 40o_15 15+-5 10+/- 5 30 5 Special Well Water Samples As recommended by.the New York State Department of Health in the middle of 1959, two additional wells were located from which grab samples were taken for radioactivity measurements.

WATER SAMPLES (CONT'D) Special Well Water Samples (Cont'd) One well was located on the Indian Point property while the other one was located in Verplanck. The well in Verplanck is at a lower elevation than the Indian Point well and is therefore more representative of the bottom elevation of the Indian Point reactor vessel. Samples from both wells were also given to the New York State Department of Health for similar measurements. Results are given below: GROSS BETA ACTIVITY MICRO.JUCROCURIES 9 PER MILLILITER X 10y SUSPENDED DISSCLV."D TOTAL SOLIDS SOLIDS ACTIVITY LOCATION Verplanck COLLECTION DATE 10-23-59 Less Than 1 11-27-59 Less Than 1 20-10 20+/-10 20+/-10 Indian Point Verplanck Continuously 11-27-59 Not Filtered 20+10 5+/-5 10+/- 5 15+ 5 12-29-59 5+_3 12-29-59 Less Than 1 5+/-5 15+/- 5 Collected Hudson River Water Sa.rles The Westchester County Department of Health arranged for the continuous collection of Hudson River water at the Standards Brands Plant irnuediately north of Indian Point and at the Sing Sing Prison in Ossining. Samples of this water are tested by the Westchester County Department of Health and by Consolidated Edison. Results obtained by the latter are given on the follow-ing page.

MEASURED GROSS BETA ACTIVITY OF HUDSON RIVER WATER SA'4PLES COLLECTED BY THE MEW YORK STATE DEPARTMENT CF HEALTH IN 1959 MONTH COLLECTED November LOCATION Sing Sing Prison - Ossining Standard Brands-Peekskill TOTAL ACTIVITY NICROCURIES PER MILLILITER X 10 -9 40 + 30 50 30 December Sihg Sing Prison - Ossining Standard Brands-Peekskill 15 t 30 5 +/- 10 VEGETATION AND SOIL Vegetation Results of the gross beta measurements made on samples of vegetation collected at the various sampling locations are shown on Plate 8. This vegetation consisted of grass and weeds growing in the vicinity of the test locations. The activity is much less than that in 1958 due in all probability to the fact that no bomb tests were made after the end of 1958. SUIMARY OF GROSS BETA ACTIVITY IThASURED FROM VEGETATION SAI4PLES I NO. OF SAIPLES UNITS Micro-Microcuries Per Gram of Fixed Solids MI NU-TUM 190+/- 20 MAXIMUM AVERAGE 1850+/-50 580+30 Soil Plate 9 shows the results of the gross beta activity measured from soil samples collected at the various sampling locations.

Soil (Cont'd) A summary of the results is given below. The average is approximately the same as it was in 1958, although the maximum is lower and the minimum higher than it was in 1958. The naturally occurring activity has a tendency to mask any increase or decrease in activity due to fission products. A report on soil analysis may be found in Section III.

SUMMARY

OF GROSS BETA ACTIVITY IT'ASURED IN SOIL NO. OF SAMPLES 34 UNITS Micro-Microcuries Per Gram Curies/Sq. Mile MINIMUM 2010 3+/- 2 MAXIMUM 70t10 10t 2 AVERAGE 40_010 5+ 2 Biological Samples The table below, shows the results of the gross beta measure-ments made on samples of fish and crabs removed from the Hudson River at Indian Point and frogs removed from the lake at Indian Point. The difficulty involved in their collection accounts for the small number of samples. A periodic system of collection has been established for 1960 by which samples of fish will be secured with the assistance of the New York State. epartment of Health. The results show a slight drop in the activity from that measured in 1958. slightly higher than that measured in COLLECTION DATE 4-30-59 7-8-59 8-11-59 8-11-59 8-27-59 9-1-59 9-17-59 9-28-59 TYPE OF SAMPLE Shad Crab Frog Tadpole Frog Frcg Frog Frog maximum and average The minimum is 1958. MICRO-MICROCURIES PER GRAM OF FIXED SOLIDS 160+/-30 140+/-15 100+/-10 100+/-10 100+10 120+/-10 100+/-20 100+410 Minimum 100t10 Maximum 160_30 Average 115+/-15

FALLOUT An open-pot type of collector was placed at the Indian Point site and monthly collections of atmos-pheric fallout were obtained. The collector is actually a polyethylene funnel, 12 inches in diameter, that drains into a collecting bottle. Once a month, the contents of the bottle are removed to the laboratory; the suspended solids are filtered out, and the gross beta activity is counted. The dissolved solids are recovered by boiling the filtrate, and the gross beta activity similarly counted. The gross beta activity of the total monthly sample is shown on Plate 10 and the activity of each of the parts is given in the following table. GROSS BETA ACTIVITY OF FALLOUT COLLECTED AT INDIAN POINT MONTH COLLECTED January Suspended Solids Dissolved Solids Total MICRO-MICROCURIES PER MONTH 1690t 90 950+/- 60 2640o110 5260+/- 60 1880+ 20 714oG 65 CURIES PER SQUARE MILE PER MONTH x 10 -3 60+ 2 35+ 2 95+/- 3 February Suspended Dissolved Solids Solids Total March April May June Suspenaed Solids Dissolved Solids Total Suspended Solids Dissolved Solids Total Suspended Soli4s Dissolved Solids Total Suspended Solids Dissolved Solids Total 13900+-130 2200+/- 50 16100+/-140 20000.140 6280,+ 70 26280o.160 2450+ 50 610* 30 30604-60 2680+110 560T. 40 3240_+120 190+ 70t 260+ 220+ 301 250t 290+/- 90+/- 380t 120+/- 90+ 210+ 2 1 2 51 5 5 1 5 5 5 5 ii 100+ 20T 120+ 5 1 5

1ONT11 COLLECTED July Suspended Solids Dissolved Solids Total MICRO-MICROCURIES PER MONTH 3260+110 230+ 30 3490*110 CURIES PER SQUARE MILe PER MONT x if)"' 120+ 5 107 1 130+/- 5 August Suspended Dissolved September Suspended Dissolved October Suspended Dissolved November Suspended Dissolved December Suspended Dissolved Solids Solids Total Solids Solids Total Solids Solids Total Solids Solids Total Solids Solids Total 10970+/-110 390+110 11360+/-160 12it 30 50+ 25 170+/- 40 220i 50 220-F 50 40+ 20+ 60T 5+. 2+ 7+- 1 1 1 5 55 10+ 2

10. 2 210+

550+ 160-_ 25+ 185+ 50 40 60 30 25 40 10+ 1+ 10T 2 1 2 1 1 1 5+/- 1+/- 6+

SECTION III Reports:

1. Radioactivity of well and spring water.
2. Measurement of Strontium 90 in soil.

June 18, 1959 Mr. E. R. Thomas, Manager Meter and Test Department No. 5950 SHORT-LIVED ACTIVITY OF WELL WATER AND SPRINGS VICINITY OF INDIAN POINT Tests were made to determine the short-lived radioactivity of water from several drinking water wells in Putnam and Westchester Counties. Water from some of these wells was checked for gross alpha and beta activities during 1958, but was counted 48 hours after collection to allow the radon daughters decay. The samples reported herein were counted shortly after collection to determine the short-lived activity. Two liter samples were collected in polyethylene bottles and aliquotS filtered through millipore filters. The millipore filter was burned with alcohol in an aluminum planchet and the residue was introduced in a Type PC-3A proportional counter where successive measurements were made for alpha and beta activity. Most of the samples were counted within a few hours after collection. The suspended solids were counted within 10 minutes from the beginning of filtration. The results of these measurements for 2 samples are plotted on Plate. Nos. 1 and 2. The linear portion of the alpha and beta decay curves shows an effective half-life of about 30 minutes. This compares closely with the half-life of radon daughters. The filtrate was evaporated to dryness with a hot plate in order to measure the activity of dissolved solids. No alpha activity was present after evaporation, and the beta activity ranged between 1 X 10-9 and 5 X 10-9 microcuries per milliliter, very low values for water, but comparable to longer lived gross beta activity of well water found in 1958. To confirm that the short-life activity is due to radon and radon daughters another test was made in which a water sample was kept in a tightly stoppered bottle from which aliquots were removed at various times up to 12 days. These were filtered and the activity of the suspended solids measured within 10 minutes after removal from the bottle. Since parent and daughters have been together in the bottle at least 3 hours, the approximate time required for radon daughters to build up the rate at which'the daughters are being formed equals the rate at which the parent is disintegrating. At this equilibrium condition, if the daughters are separated and counted within a few minutes, then this activity is nearly proportional to the parent activity. By plotting the changing activity exhibited by the suspended solids for period of days, a decay curve can be drawn which corresponds to the radon activity decay. This decay scheme is shown on Plate No,3 indicating an effective half-life of 3 days. This approximates the half-life of radon gas.

No. 5950 June 18, 19591 Table No. 1 summarizes the short-lived activities measured in well water and springs. The highest activities were found in drinking water from a deep well, 160 feet, in a section of Putnam County where lead was mined at the turn of the century. Low short-lived radioactivity was measured in the Camp Smith reservoir which is well fed, and no alpha and very low beta activities were found in the larger Peekskill and Croton reservoirs. The decay characteristics of these short-lived activities and the effective half-lives measured, indicate radon and its daughter products are responsible for the high activities found in well water, attach. A. K. Joecks jt.rr Test Engineer

No. 5950 S --June 18, 1959 TABLE -NO-. I

SUMMARY

OF ALPHA AND BETA ACTIVITY 01' SUSPENDED SOLIDS IN DRJNKING MATER FROM WIULIS ANT) SPRINOS - VICINITY OF INDIAN PT. ACTIVITY & COUNTING ERROR MICRCCURIES PER MILLI-SAMPLING LOCA.rTION Knapp Rd., Hortontown, Putnam, N. Y. (Property of W. J. Odendahl) Mom's Rest. Rt. 9-D Manitou, Putnim, N. Y. Highland Country Club, Rt. 9-D, Garrison Putnam, N. Y. Camp Smith, Westchester, N. Y. 1)IOURCE DATE AND TIME OF COLLKCTION DATE A1;D TIME OF INITIAL COUNT 11:10 A.M.-5-12-59 9:00 A.M.-5-13-59 LITER..! X 10ýy 160' Well 160' Well 10:30 A.M.-5-12-59 5:30 A.M.-5-13-59 .1:00 P.M. 7-59 1:16 P.M.-5-12-59 1:16 P.M.-,-12-59 ALPHA 24880

  • l40 4380 +/- 130 840 +/- 20 500.

30 140+/- 20 BETA 1500 ++/- 230 1120O +/- 220 17' Well 17' Well Surface Spring 4:00 1:26 1:26 P.M. 7-59 P.M.-5-12-59 P.M.. 5-12-59 1700 t B7oo t; 800 +/-: 250 j 180 +/- 330 t 30 5030 40 40 7 5 10' aell Spring Fed Tap

,eln Water Chlorinated Reservoir after Well 12 Noon-5-14-59 12 Noon-5-14-59

-1:00 A.M.-5-28-59 11:00 A.M.-5-28-59 4:00 P.M.-5-14-59 4:00 P.M.-5-124-59 4:00 P.M.-5-28-59 4:00 P.M.-5-28.-59 60 70 16 16 t 10 10 24 4 28 t 37 t Counting errors are for a 95 per cdnt confidence level jt.rr

777777777=

PLATE NO. I WMCA 7-4 3 I I I M Ic% 5 ILJ 7-go -6 = 4- <.id 0 4 > O 2.U. 9. CONSOLIDATED EDISON COMPANY OF NEW YORK. INC.j DATE 5 TEST BUREAU N.55 0 60 2 ct aern t 1I rnftu *maIgmam Arnlrn hlaamm..- 180 240

9* .7 6 5-4 .3 PLATE NO12 [+T~F 9-8* 7 6 4 3 .1 I I I I I I i ZI I I I, 7-5- 4-6-U-ah-- V

i.

7_ 5 4 3-8-- 5-7=- 1 at !q 2.. CONSOLIDATED EDISON COMPANY OF NEW YORK. INC. DATE 6-18-59 TEST BUREAU NO.5950 I I I 0 s0 120 FLOU~B TIMF PAnm MIMITIAI i1AhiT - 111111111Ce 180 240

7-5- 4-VT A 3-2 -F-{- -I I MA MR-7- 6-5- 4-3- 4 tZ 6-Inn~ 7-6- 5-4- 8* 7.- - 6_2 I. ELAPSED TIME FROM COLLECTION - OAY.* CONSOLIDATED EDISON COMPANY OF NEW YORK. INC. DATF. 6M18-59 TEST BUREAU NO. 5950 10 12

CONSOLIDATEm EDImON CoP.A-wy OF NEW YORK, INC. MEMORANDUX September 16, 1959 Mr. E. R. Thomas, Manager Meter and Test Department No. 5950 STRONTIUM 90 IN SOIL The strontium 90 content in the soil has been determined in conjunction with the pre-operational survey for the Indian Point Nuclear Power Station. Soil samples were collected at the plant site and at a reference site, Dunwoodie"' Substation, which is far enough away to be beyond the influence of the reactor. Portions of each of these samples were analyzed by the Nuclear Science and Engineering Corp. and by the joint efforts of the Chemical Engineering Bureau and the Test Bureau. The results obtained are: Millicuries per Square Mile Sample NSEC Con Edison Indian Point Plant 42.-7T 1.9 52+/- 5 Dunwoodie Substation 31.1 +/- 1.6 52 +/- 7 According to Dr. Gerald H. Hamada of the New-York office of the AEC, these results compare with their most recent measurements on Westchester County soil which were in the order of 40 to 50 millicuries per square mile. The report of the NSEC is attached together with a description of their method for the determination of strontium 90 in soil. The analysis made by Con Edison was in accordance with the HASL-33 report of the AEC except that in the final steps in the preparation for counting, the sample was evaporated on a counting dish rather than filtered and dried in the filter. attach. ecks wfn.bao Tt Engineer Copy to -A.-R. Belyea [ 3-24 (EA) SON 11.5a GEM. orw..r..

4ý 1 P. 0. Box 10901. PITTSBURGH 36. PENNSYLVANIA HOMEBTAo 2-4000 NSEC NO. 30-14-5003 L9.21 July 31. 1959 Customer Order No.: M 9-21908 Send report to: Send invoice to; Consolidated Edisom Co. of Now York, Inc. Test Bureau 708 First Avenuo New York 17. Now York Consolidated Edison Co. of New York. Inc. Accounts Payable Bureau 4 Irving Place New York 3, New York INVOICE 2 soil samples assayed for Sr90 at $80. 00 $160.00 REPORT Sample No. Total surface area for 30 plugs (sq. mt.) Gross dry weight for 30 plugs (g) Sample submitted (g) Sample analysed (S) Acid soluble Sr90 in sample analysed (dpm) mc Sr 90/sq. mt. DSI 2.35 x 100* 3330* 11900 205 100

  • 500
31. 1*1.6 Isl
2. 35 x 10' 4010*

1530* 202 112 *5*0 42.6*1. 9

  • data provided by A. K. Joecks
  • e errors are in terms of the standard deviation of counting multiplied by appropriate factors to correspond to the units given.

Seconr LeSalter Section Leader Ench "Determination of Acid Soluble Sr-90 in Soil"

DETERMINATION OF ACID SOLUBLE SR90 IN SOIL (1) Sample preparation The entire soil sample or a representative aliquot of it is dried for several hours at 110 0 C and weighed. The dried sample is leached with agua regia. diluted with water, and the supernate is decanted. The residue is given a second aqua regia treatment, and after this supernate is decanted, the residue is washed with water. (2) Radiochemical purification of Sr 9 0 85 Sr tracer and strontium carrier are added to the combined supernates and washings. The solution is made basic te phenolpthalein with NH 4OH and an excess of a saturated solution of iNH 4;ZCO3 is added. The supernate is decanted and discarded after centrifugation, and the precipitate is dissolved in the minimum amount of con-centrated HNO. An equal volume of 90% HNO is added, the sample cooled in an ice bath, and the precipitate centrifuged, washed with concentrated HNO 3 (Note i. and dissolved in the minimum amount cI water. +3 A few drops of Fe carrier are added !o this solution which is made basic with CO 2-free NH 4OH. The precipitate is cen~ri!uged and discarde& the supernate is acidified and the Fe(OHj 3 scavenging repea:ed. The time of the Qecond Fe{OH, pre cipitation is taken as zero time for Sr90 Y90 equilibration. A few drops of barium carrier are added, the sc'ution is adjusted tr a pH -f 5. 5 with HAc and NH Ac. and 4 BaCrO is precipitated from the hot.-olution by the slow addition of 1-5 M Na Cr 0 4 2

& 7 The. precipitate is filtered and discarded.

After the filtra'e is made basic with NH 4OH. SrCO is precipitated by the addition of a saturated soluticn of (NH4' CO_. The SrCO

V is filtered, dried and the Sr85 recovefed is .ointed. The ratio of Sr activity recovered to that added is used as the strontium chemical yield. The precipitate is quantitatively dissolved in acid and stored. (3) Y90 milk: After two weeks, to allow icr equilibration between Y9 and Sr90 yttriu carrier is added to the acid solution of SrCO and a double precipitation of Y(OH) 3 is made with CO -free NH OH. The time of the first Y(OH) 3 precipitation is taken as 2 43 thetie o te 90 S90 the time of the Y - Sr separation. The necond Y(OH) 3 precipitate is dissolved in acid and the yttrium precipitated as the,,xa-i'.e at a pH of 1. The Y 2(C 04)3 is filtered. washed, and ignited to the oxide which is weighed to determine the yttrium chemical yield. The Y203 is mounted for counting. (4) Preparation of the sample for counting-The weighed carriers are placed on a micarta semi-cylinder (0. 75 inch I. D., Z. 5 inches long) and mixed with an aqueous solution of agar agar. The mixture is spread 2 over an area of 2 to 5 cm to produce a sample of approximately uniform thickness. After the sample is dried and covered with -ubber hydrochloride (0. 5 mg/cm it is ready for counting. (5) Counting: The sample is counted in one of NSEC's sixteen low level beta counters. These are constructed with cathodes of thin aluminized mylar and operate as gas flow Geiger Muller counters. They are shielded by 8" o: c*eel, ah anti-coincidence umbrella of Geiger Muller tubes, and 1" of triple distii"ed mercury.

3-The decay of Y90 is followed for 8-i0 days. The counting'rate of Y90 at time of separation, R, is determined by analysis of the decay curve with extrapolation of 0 the 64 hour half-period to the time of milking. A sufficient number of counts are collected to obtain a gross counting rate with a standard deviation < 15% for samples with a gross activity under 1 cpm, < 8% between I and 5 cpm; and < 5% above 5 cpm. The backgrounds of the counters are about 0. 3 cpm; the backgrounds for each counter are checked daily. A sufficient number of counts are obtained to calculate the background counting rate to a standard deviation of

  • 0. 04 cprn.

137 KCl and/or Cs standards are counted daily to maintain a continual check on counter operation. (6) Determination of Sr90 disintegration rate: The calculation of the total Sr90 disintegration rate is made from the following equation. RE D 0 Y 1Y 2(l-e"- Xt where D = total Sr90 disintegration rate a0 = y 0 counting rate at time of milk E =overall counting efficiency correction factor (includes corrections for geometry, absorption, self-absorption, and scattering phenomena). Y I = strontium chemical yield Y = yttrium chemical yield X = y0 decay constant t = time for Yg0 growth between Fe(OH) 3 scavenging and Y milk.

ý ' Notes: (1) A complete separation of strontium and calcium is not necessary since the strontium chemical yield is determined by the recovery of Sr T-acer. 85 acer4

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