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{{#Wiki_filter:SONGS HP INDIVIDUAL TASK ASSIGNMENT (!TA} 4 } De s C r i be w h a t C On s t it u t e s C Om p 1 e t i O n _--';.'-'i/~,/i-i'-',,,,?~,,j"",-'-~. --~~.... ~;-* __ r~*~... '-',i,-'-:..'--, 1._,..,_.~, ~)\\-*~--~;~,*-**-~r'--, :-~**"=':~'--,R"-'i'e--/---=<l."-_f_-""'~~,-;_r""C-t..._*____,,,'--..Q"-. I B. ASSIGNOR(S): Compliance with this Section is indicated by your signature or initials below.
- 1) All necessary documents are to be referenced and/or readily available and/or attached.
- 2) Prime assignor and assignete discuss th..!.:_JIA(a~d agree on Prime,.*Q\\J~.. Da~e, assignor en~;rs: \\~}
PRIME DUE DATE* ofs2-c94--3_Assigned to I ~7,(201,/' By lk:1.:,J(c_) On/-*_-**< C::,*rtt,**
- 3) Subsequent assignor and as ignee discuss and agree on Sub Due Date, assignor enters:
SUB DUE DATE* of Assigned to By On _____ _
- 4) Assignor(s) gives original !TA to assignee and forwards a copy ta TAC Coordinator.
- Prime Due Dates should be at least 5 caleridar days beyond the date when task first assigned and Sub Due Dates must not be later than Prime Due Dates.
~* C. DUE DATE EXTENTION REQUEST: This Section is not a substitute for the Prime Due Date in Section B which must be agreed to between assignor/assignee prior to establishment. Required exten-sions, initiated by assignee, are to be requested as far in advance of the pending due date(s} as possible whenever completion date problem; are identified. 1 ) New SUB DUE DA TE of ______________ R e quested By ________ ---c-_On_.------ ~*
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- 3) Reason why due date cannot be met ____________________________ _
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- 5) New PRIME DUTE DATE of Approved By On ____ _
- 6) Copy of ITA forwarded to TAC Coordinator By _______________________ ~
D. TASK COMPLETION: To be completed by assignee and forwarded to originator.
- 1) Statement of completed action &,... l?LE.Teb :n-tE i2.EQuEs.~
- . LiE:,...AO 2} Date completed
- 3) Is a co PY of completio,n (ACTION IS NOT COMPLETE WITHOUT THIS)
- 4) Signature of Assignee
- 5) Originator is to forward supporting documentation to TAC Coordinator.
To TACC on date, By ____________________ _ Distribution: White - Originator Canary & Pink - Assignee Goldenrod - TAC Coordinatof --l""Cl:I.....,,.... \\
SUBJECT:
REFERENCES:
MEMORANDUM FOR FILE February i7, 1984 1101 d Highway 101 Land Fil 1 11
- 1) Radiation Survey Report, C. Holle to 8. Graham, dated April 17, 1981
- 2) Letter, R. Melgard (EAL Corporation) to B. Graham (SONGS Chemistry), dated April 3, 1981;
Subject:
11 Soil Samp 1 e Results" On January 12, 1984, a telephone conversation occurred between Mr. B. Graham, SONGS Environmental Monitoring, and Mr. G. Yuhas, USNRC-Region V. Mr. Yuhas inquired about the results of a Station investigation regarding the possible presence of plant-generated radioactivity in the "Old Highway 101 Land Fill." He recommended that Station review the results of radiation surveys and isotopic analyses of soil samples obtained at the land fill to determine the need for a 10 CFR 20.302 submittal. The purpose of this Memorandum is to document Station's evaluation of all available radiological data relating to the land fill site and to close the issue. BACKGROUND: During the March 1980 - June 1981 Unit 1 outage, TMI retrofit projects required the removal of soil from radiologically controlled areas. Isotopic analyses of samples of the excavated material revealed the presence of low level radioactive contamination. As a result of those findings, Station investigated disposal methods for previous excavations at SONGS Unit 1.to determine whether or not contaminated soil had been inadvertently released. It was determined that the only significant excavation which had previously been experienced at Unit 1 was performed during the October 1976 - March 1977 outage when a significant amount of substrate was removed to allow construction of the Diesel Generator and BiologicaJ Shield structures. Through interviews with individuals who worked on those projects, the location of the disposal site for the excavated material was also determined..
MEMORANDUM FOR FILE February 17, 1984 SURVEYS AND ANALYSES: Reference 1 describes an extensive radiation survey conducted of the "land fill" area in March 1981. Exposure rates between 5 11R/hr and 15 11R/hr were measured by Ludlum Model 19 Micro-R-Meters. Those readings were well within the normal range for natural background radiation. The surveyor concluded that there was no evidence of radioactive contamination. That conclusion is substantiated by the results of isotopic analyses performed by EAL Corporation, a contract laboratory, on three soil samples obtained from the land fill. Reference 2 reports those results, and indicates only naturally occurring radon and thoron daughter products. No radioactive activation or fission products were identified. DISCUSSION: Though all exposure rate measurements were within the range of natural background radiation, the radiation survey map, contained in Reference 1, seemed to indicate a localized area with slightly elevated readings (14-15 µR/hr). To evaluate that anomaly, the land fill site was visited. The "old land fill 11 is located approximately 1 1/2 miles south of the new Edison Training and Education Center. The land fill is accessible by the frontage road that parallels Interstate 5 on its east side. The site consists of two ravines which run from the frontage road, join near Interstate 5, and term.inate in a culvert which continues under the Interstate. The area is heavily overgrown with foilage, although dirt mounds and broken concrete are visible. Exposure rates of 5 11R/hr to 10 11R/hr were observed in and around the ravine using an Eberline PRM-7 Micro-R-Meter. The readings were not increased by placing the meter in contact with the material that had obviously been off-loaded there. Special attention was paid to the area which showed the highest readings during the referenced survey. The points which showed elevated readings during the 1981 *survey were located and exposure rate measurements were made. The exposure rate observed on the shoulder of the road was 8 11R/hr to 10 11R/hr. The exposure rate measured on the surface of the concrete road was 14 µR/hr to 16 11R/hr. Similar measurements were obtained along the road in the vicinity of the ravine with identical results. An analogous set of measurements made at a location approximately 1/4 mile north of the land fill demonstrated comparable results. It is obvious that the elevated exposure rates are the result of natural radioactivity in the concrete of the road.
) MEMORANDUM FOR FILE February 17, 1984 CONCLUSION: Based on the results of GeLi analyses performed by the contract environmental laboratory, the extensive radiation survey performed in 1981, and the recent verification of the results of that survey, the soil disposed of in the 1101d Highway 101 Land Fi 11 11 did not contain 1 i censed material. A 10 CFR 20. 302 submittal is not required. TC:20271:jms cc: P. J. Knapp R. V. Warnock G. Gibson B. Graham COM files 1-~~
- - TERRY COOPER Health Physics Engineer
) ) ) January 12, 1984 P. KNAPP
SUBJECT:
Radiological Environmental Survey of Old Hwy 101 Landfill Attached for your information and review are:
- 1)
Telephone note from Jan. 12,-1984 conversation between B. Graham (SCE-SONGS) and Gregory Yuhas (NRC).
- 2)
EAL Corporation results of laboratory analyses of soil samples collected from the subject landfill.
- 3)
Report from C. Holle to B. Graham concerning Environmental Survey of subject landfill. Please let me know if you need additional help or information. BDG:li Attachments cc: L, D. Brevig R. Warnock P. Croy D. Duran R. Rosenblum Chemistry File CDM ~~ B. GRAHAM
) TE LEPOONE NOTES OF WITH b, y.; ~A-$ DATE
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1 c:> '1 Lt~ ( SUBJECT KA.o,c,,-o'-,C.k\\.- S, ... 112-ue"J' QP- / ACTION REQUIRED \\..\\.-.,.., -,, l D I to c_J2-e-2-0. '=3 o ~ DISCUSSION HIGHLIGHTS AND AGREEMENTS REACHED OP h.S-ll'Z'~ ari, tp, >>) ' A ID ( F- >>3 ltO UI NltW 11/70 (c:w) \\.....,1,......,or-,..........._ DISTRIBUTION l-Bas-v, b O.P
J ) CORPORATION 2030 Wright Avenue Richmond, California 94804 (415) 235-2633 (TWX) 910-382-8132 Mr. Barry Graham San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92672
Dear Mr. Graham:
3 April 1981 Ref: EAL 2301 The results of the soil samples we received on March 2, 1981, have been completed and are shown on Attachment 1. We appreciate this opportunity to be of service. Very truly yours, Marvin P. Hunt Senior Environmental Chemist {3. ~,~ I Rodney ~lgard, ~~:::i Nuclear Science Department MPH/RM/cm cc: D. F, Filmer
I I':. . -f./
- r.
) ) ATTACHHENT 1 SOIL RESULTS Ge (Li) Scan Radiochemical Collection Site nCi/kg +/- 2 0-nCi/kg +/- 2 CT and Date (dry wt. basis) Isotope (dry wt. basis) Jap Mesa Dumpsite 0.51 +/- 0.03 60Co 1/21/81 0.63 +/- 0.03 137Cs 0.70 +/- 0.04 226Ra decay chain (1) 0.36 +/- 0.07 232Th decay chain (2) gosr 0.09 +/- 0.02 SONGS I 0.07 +/- 0.01 60Co Security Bldg. 0.04 +/- 0.01 137Cs 1/21/81 0.47 +/- 0.02. - 226Ra decay.. chain (1) 0.28 +/- 0.04 232Th decay chain (2) gosr 0.02 +/- 0.01 E. side of 0.05 +/- 0.02 60Co Sphere Near 0.12 +/- 0.02 137Cs Door 16 1.05 +/- 0.05 226Ra decay chain (1) 2/19/81 0.33 +/- 0.06 232Th decay chain (2) gosr 0 +/- 0.01 Location 0 +/- 0.01 60Co No. 33 Old 0 +/- 0.01 137Cs Hwy. 101 0.33 +/- 0.03 226Ra decay chain (1) 2/19/81 0.29 +/- 0.05 232Th decay chain (2) gosr 0 +/- 0.01 Location 0 +/- 0.01 60Co No.. 28 Old 0 +/- 0.01 137Cs Hwy. 101
- o. 29. +/- 0.03 226Ra decay chain (1) 2/19/81 0.26 +/- 0.05 232Th decay chain (2) 90Sr 0.04 +/- 0.01 Location 0 +/- 0.01 soco No. 24 Old 0 +/- 0.01 137Cs Hwy 101 0.42 +/- 0.03 226Ra decay chain (1) 2/19/81 0.35 +/- 0.06 232Th decay chain (2) 90Sr 0.02 +/- 0.01 (1)
The n;:iturally occurring 22 6Ra decny chain r~por.ted is cnlcul.it0d 011 the 21LJBi photopeak at 0.609 MeV. Other pho_topeaks detected in this chain are 226Ra, 214Pb, 210Bi and 210Tl, (2) The naturally occurring 232Th decay chain reported is calculoted on the 22BAc photopeak at 0.910 MeV. Other photopeaks detect~d in this chain are 22srh, 212pb, 212Bi and 2osT1.
SAN ONOFRE NUCLEAR GENERATING STATION MEMORANDA FOR FILE TO:
- £3, GRAHAM FROM:
.C. HOLLE APRIL 17, 1981
SUBJECT:
Environmental Survey of 1976-1977 Land Fill Site approximately 2.5 miles South East East of Jap Mesa PURPOSE: During the. construction of Unit One Sphere Containment in 1"976 and 1977 a large amount of soil**was*removed and disposed of at a site approximately 2.5 miles South East East of Jap Mesa. During the disposal operation there was evidentially no reason to be concerned with the possibility of this resultant land fill being contaminated with radioactive materials resultant from the past operation of Unit One. With in the recent past a careful study has been made of the events surrounding the exavation and subsequent disposal of soil associated with Unit One Sphere. The results of this study pointed for a need to survey the land fill site to asertain once and for all the degree of radioactive contamination, if any, present at the site. On February 4, 1981 through February 7, 1981 a radiation survey was conducted by Moore, McClung, Southerland, Naylor and Antonelli. Although this represented an extensive survey of the area a number of questions were raised during the analysis of the survey results. These questions were roostly based on two criteria. First, there was extreme difficulty in matching the data gleened from the two different Ludlum Model 19 Micro-Roentegen Meters used for the survey and the low range calibration of these instruments were also in question. Secondly, data showed a wide variance in reading obtained in adjacent locations. For example data from a survey of the drainage tunnel under Interstate 5 showed a variance from 10 to 150 micro-roentegen/hour. It was also noted that the survey -did not include information from areas of the ravines were the angle of incline approached and many times exceeded 30 degrees. Because of the foregoing reasons on March 12, 1981 the decision was made to conduct an exhaustive and hopefully reproduceable survey again to asertain once and for all whether or not the activities associated-with the 1976-1977 Unit One Sphere construction had led to any radioactive contamination of the land fill. DISCUSSION: During initial planning for the survey every attempt was made to devise procedures that would standardize each survey measurement and make it possible to locate at a later date each survey point for later resurvey or soil sampling. After careful research it was decided that all survey measure-ments would be taken at a distance of one meter from the surface of the soil. This hopefully would allow a comparison of results with other environmental surveys performed recently throughout the Health Physics profession.
f. , 11 r SAN ONOFRE NUCLEAR GENERATING STATION MEMORANDA FOR FILE
- 17.
APRIL }<1, 1981 PAGE 2 DISCUSSION (Continued): To eliminate any unexplainable data varience two other techniques were devised to both enhance reproducability and detect source position and/or any interference caused by buildup of naturally occuring airborne radio-activity.resultant from atmospheric inversion at the survey points. First, careful study of the manufacturers literature yielded a detailed u~derstanding of the Ludlum Model 19 Micro-Roentegen Meter. This instrument
- has a one inch by one inch Sodium Iodine (Thallium activated) crystal located at the front and bottom of the instrument. Hence all survey measurements were
. taken with the face of the instrument dial' and thusly-the centerline of the*- crystal parrelle1 to the soil surface being measured. This technique was rel-atively easy to perform on gentle inclines and somewhat more difficult when dealing with inclines which in some cases exceed 30 degrees. Further study of the manufacturers literature gave helpful infonnation about the response char-actistics of the Ludlum Model 19 Micro-Roentegen Meter. As all measurements were theoriz-ed to be readable on the. lowest scale, 0 to 25 Micro-Roentegen/Hour, all data was taken with the instrument in the Slow Response or Slow Reaction mode. This technique resulted in a period of response as per above mentioned manufacturers literature of approximately 11 seconds for each measurement. Actual field experience indicated reproduceable response time of approximately 5 seconds to as long as 30 seconds. For this reason, at each survey point the instrument was held in the above discussed geometry for a period of 15 to 30 seconds to insure that the instrument had indeed given a stable and reproduc-able measurement. Second, extensive past field experience with the measurement of low level radiation levels had indicated as much as a 30 percent* variation in readings observed when the individual holding the instrument positioned the instrument so as his body was between the source of radiation and the detector as opposed to having an unobstructed field of measurement in relation to the known source. Detailed study of professional papers submitted throughout the Health Physics profession indicated that the potential for interference in data resul-tant from the accumulation of naturally occuring airborne radioactivity during atmospheric inversions. In worst cases measurements could be caused to vary as much as 85%. It was noted that these accumulations of airborne radioactivity when encountered during atmospheric inversion almost exclusively represented cloud-like concentrations in which a given reading with in the cloud varied at least 15% with a change in air movement, survey instrument position, and time. This characteristic of natural airborne radioactivity appeared reprod-uceable in all instances except those dealing with a partially enclosed areas such as the drainage tunnel under Interstate Highway 5 where measurements were much more uniform due to lack of air movement wi*thin center portions of the tunnel. 1
- Due to the foregoing considerations at each survey point four seperate measurements were taken. Using a relatively inexpensive compass with no mag-netic corrections applied measurements were taken at each point with the instrument and the individual holding the instrument facing in the North, then East, South, and West compass directions in that order.
- ~ -
SAN.ONOFRE NUCLEAR GENERATING STATION MEMORANDA FOR FILE APRIL 17, 1981 P.AGE 3 DISCUSSION {Continued): Comparison of the four measurements at each point made it possible to distingui*sh as to whether the data for each particular point was indeed valid and reproduceable. Measurements when later compared with other measurenents at the same point would be expected to vary one from*: another by less than 15% unless some other influence such as close proximety
- to a point source or build up of naturally occuring airborne radioactivity during atmospheric inversjons. Actual field experience showed that only 10 survey locations out of the over 130 locations surveyed showed a*variance of greater than 15%. Variance was calculated by selecting the highest and lowest of the four readings taken at a given point. The difference* between these two values was then divided by the lowest reading giving a decimal that could be converted to percent variance. Later resurvey of these 10 locations showed that earlier reading were definitely being effected by the build up of naturally occuring airborne radioactivity during atmospheric inversion.
For example one survey location when first measured showed readings between 11.5 and 15 micro-Roentegen per hour. Initital examination of this data showed a varience of over 30% between the four readings taken at that location. After comparison with other -surrounding survey points it appeared evident that this varience was not being caused by a point source. As field experience grew it became'readilly clear when the survey point was under the influence of an atmosph~ric inversion. For example on one Sunday morning a general background of 19 mi cro-Roentegen per hour was observed where earl er data showed.. readings of 8 to 10 micro-Roentegen per hour and when the locations in which variences of greater than 15% were observed were resurveyed the highest reading observed was greater than 15% lower than that initially observed and agreement between points was well within! 15%. As the desired goal was to obtain enough information from survey of both landfill areas and the nearby areas to distinguish a~y possible differences between the two several techniques were developed to this end. Due to the large area to be surveyed in was deemed that the initial survey points would be approx-imately 10 meters apart. Later examination of the data would show whether a more detailed area survey was required, but hopefully~ and as field experience proved this degree of detail was both expediate and substitive enough to reach the desired goal. It should be noted that out of the approximately 3000 square meters surveyed only approximately 900 square meters showed distinct evidence as being of landfill origin. In order that the data presented would be an accurate reproduction of the trends in radiation levels observed in one area versus another the sequence and techniques used in taking the measurements became most important. Due to the ruggedness of the terrai'n line of site approxirnations of perpendicual or par.alle1 angles became impossible. To solve this problem a compasss was purchased which. although not corrected for magnetic error, made it poss,ble for adjacent survey points to belayed out in a NORTH-SOUTH, EAST-r/EST GRID somewhat like that observed on a road map where the upper left corner is North-West and has the designation A-1.
'""l\\ } ' r' SAN ONOFRE :NUCLEAR GENERATING STATION MEMORANDA FOR FILE APRIL 17, 1981 ~ PAGE 4 DISCUSSION (Continued): The sequence in which the survey data was taken was designed to most effectively place survey locations approximately 10 meters apart without the time consulllling~* use of surveyors equipment, Starting in the North-West Corner of the survey area a sequence of survey points was taken in an arc starting at 90 degrees and proceeding to 180 degrees at which time a return to 90 degrees was affected, 'l'his process was repeated until the area of interest was s~eyed at the prescribed 10 meter intervals,
- -*--*It should be noted that at each survey point*topographical data was gathered.
for purposes of both survey map making, and later analysis of survey results, The map obtained can only be considered an accurate depiction of the area if it is realized the measured 10 meter increments cause the illustration to reflect the area as if all the depressions eg, ravines and gullies, were raised to the same level as the upper most elevations of the area, Figure 1A and 1B show the measurement data recorded for each survey point, As stated all readings are in micro-Roentegen/Hour reading the 0-25 micro-Roentegen/ hour Scale of Ludlum.Model 19 Micro-Roentegen Meter Serial Number 12906. Readings recorded are the highest observed at that point from the four readings taken, From previous discussion it should be noted again final survey results reflected. at least t 15% agreement between measurements, Figure 2 shows the soil classification given to each survey point, From reasearching recent studies made in the field of Environmental Health Fhysics it was learned that retention of radioactive materials in soil was inversl)'. ;pro-portional to soil particle size. This data was also helpful in definining the areas which showed evidence of being actual land fill. Landfill soil was known to be almost entirely beach sand with a relatively low soil particle size and thusly in most cases a characteristically higher natural background reading potential, Finally, Figure J depicts the area as to the incline of the soil surface incline encountered at each survey point, Initially this dat was collected. to yield a possible understanding of the potential transport mechanism afany radio-active material found at the survey site. This information was also most help-ful in making the contours sho,m as accurate as possible in light of the obviously rude direction and measurement techniques used to select the survey points. It should be noted in the summation of this discussion that no soil class-ification or elevation data is shown for the survey data collected in the drain-age tunnel under Interstate Highway 5 as this was a concrete tunnel with a slope of less than 15%.
SAN ONOFRE NUCIEAR GENERATING STATION --c:J . H£MORAiHlA FOR FILE APRIL 17, 1981 PAGE 5 '\\. CONCLUSION AflD RECOHHEN'DATIONS: After carefully examining the results presented on the attached Figures 1 through J it s.!;..r;.~ld t~ evident that no conclusive evidence what so ever was obtained tht would show any of the landfill area was contaminated by radioactive materials originating from the construction of the Unit One Containment Sphere. As expected the survey data indicated the desired varience between data collected at widely varing soil classification areas, confirming earlier studies that showed the highest background readings in areas were the soil has a relately small JJa.rticle size -e*g. less than
- 2 mm.
The readings obtained in the drainage tunnel under Interstate Highway 5 can be explained as the reading are significantly higher in the center than at either end. This leads one to believe the readings obtained in the center of the tunnel are influenced by the the buildup of naturally occurring airbonie radioactivity due to lack of venelation in the center of the tunnel and a con-sistant source represented by the concrete. In summation it should be stated that the purpose of this survey simply was to compare two adjacent areas for radiation levels knowing one area was suspect and the other was not. 'Ihe instrumentation and techni~ues used are considered adeq_uate to accomplish this effort. It should be noted that the Ludlum Model 19 Nicro-Roentegen meter is calibrated on the 0-25 Micro-Roentegen Scale by pulse signal only because of presumed background radiation interference negating the possibility of source calibration. The records of the current cali-bration on the subject scale was unavailable from the Instrument and Calibration department but linearity checks to known ranges confinned a roughly accurate calibration. Each survey point was marked with a white tape marked with the grid location and sequence number for later reference or resuxvey. Resurvey, if attempted, would hopefully use an instrument with much larger crystal size and be shielded from atmospheric interference using significantly longer data aquisition times at each survey point. From the results of this initial extensive survey there appears very little need to attempt such a resurvey. C.JH/cjh
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