ML20009A741
| ML20009A741 | |
| Person / Time | |
|---|---|
| Issue date: | 06/02/1981 |
| From: | Scarano R NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | Martin J NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| Shared Package | |
| ML20009A742 | List: |
| References | |
| REF-WM-40 NUDOCS 8107140052 | |
| Download: ML20009A741 (4) | |
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$ 6 g 1981 QJectfile Mill file WMUR c/f WMJR:GGE UMUR r/f WM WM r/f NMSS r/f GGEadie HJPettengill MEMORANDUM FOR:- John B. Martin, Director JJLinehan Division of Waste Management DEMartin Office of Huclear Material Safety RAScarano and Safeguards REBrowning f
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Uranium Recovery Licensing Branch (4t<r >gr j 9c g }8F v FROM:
Ross A. Scarano, Chief BPFish g
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SUBJECT:
2HD STATUS REPORT - EDGEMONT CLEANUF (331162) h 88
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The NRC has contracted with the Battelle Pacific Northwest Laboratorieb_ (f to conduct radiological surveys to detemine the extent of usage of uranium mill tailings at off-site properties in the vicinity of Edgemont, South Dakota. PNL operates a mobile laboratory which facilitates the collection and analysis of grab radon progeny samples (i.e., the Working Level measurement). Also, extensive gamma radiation surveys, and soil sampling and analysis are being conducted at each property. The need to conduct remedial action (i.e., the cleanup of residual radioactive materials) will be detemined based on standards established by the U.S.
EPA in 40 CFR 192
" Proposed Cleanup Standards for Inactive Uranium Processing Sites". summarizes the results of the PHL radiological surveys through April,1981. In sum, 71 structures and 7 vacant lots fail to meet the' EPA standards due to gama radiation levels greater than b uR/hr above background or radium-226 in soil content sreater than 5 pCi/g. To date, at least 184 structures will require long-term radon progeny sampling based on the EPA criteria that there is the need for remedial action if the annual average working level exceeds 0.015 YL.
Additionally, the U.S. Deparunent of Housing and Urban Development (HUD) has required that grab Working Level sampling be conducted in any structure in Edgemont before federal financial assistance will be approved.
PNL is also conducting these surveys. Results to date indicate that 60 structures fail the HUD criterion of having less than 0.033 WL (i.e.,
. C.02 Weighted Working Levels).
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The PHL work is progressing well.
Radiological surveys have been conducted in 515 structures, but surveys have yet to be completed in the remaining 46 structures where the homeowner / occupant has requested the PNL surveys.
Pill is also preparing to complete engineering assessments at the 71 properties known to date to exceed the EPA standards.
(During the summer of 1980, the ARIX Corporation completed engineering assessments et 23 other properties.) PHL estimates that the total number of structures which will require an engine ' ring assessment may be about 125.
On January 21-22, 1981, the NRC sponsored a " Workshop on Radiological Surveys in Support of the Edgemont Cleanup Action Program" which was attended by represontatives of the DOE, EPA, HUD, and several of the DOE national laboratories. The Workshop Report has been finalized and will beissuedasllUREG/CR-2083(seeEnclosure2).
In order to eliminate the need for continuing to conduct long-term RPISU type of sampling to determine the annual average Working Level, PNL is preparing a survey protocol "to locate residual radioactivity at a-property". The purpore of such a survey shall be to ascertain with a high degrec of certainty that any amount of residual radioactivity having an average radium-226 content greater than 5 pC1/g will be detected, whether such material is phy2ically located within a structure or buried out-of-doors on the property. This new survey technique will combine the presently used gama radiation survey method (both indoors and outdoors) with a more extensive soil core campling or bore-hcle lugging technique. Also, PNL has already initiated a year-long cross-calibration study comparing the results of the Track Etch Device with RPISU sampling.
In order to complete the remaireing radiological and engineering assessments, PNL will continue to keep a field team of scientists in Edgemont for the remainder of calendar year 1981.
Or'iginal S18ned byY R. A, Scarano Ross A. Scarano, Chief Uranium Recovery Licensing Branch Division of Waste Management
Enclosures:
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Monthly Report Summary for April,1981 l
1.
Structures surveyed by Grab Working Level Measurements Total Number of Available Structures:
658 Number of Requests,for Survey Received:
561 2
Sumary Table of NRC/ State Program Less Than 0.01 to Greater Than3 Number of
O.01 WL 0.033 WL 0.033 WL Retests Oct. 1, 1980
'7 (2)s 20 (2) 0 8 RRWL, 4 RRTO Nov.1,1980 33- (4) 56 (11)
'l (1) 19 RRWL, 31 RRTO
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Dec. 1, 1980 21 (7) 40 (4) 24 (4) 9 RRWL,19 RRTO Jan. 1, 1981 8
(2)
Il (3) 3 (0) 6 RRWL, 4 RRTO Feb. 1, 1981 4
(0) 'i5 (3) 6 (0) 1 RRWL, 3 RRTO March 1,1981 10 (2) 24 (3) 2 (0) 5 RRWL, 8 RRTO April 1,1981 6
(2) 11 (0) 7 (1) 0 RRWL, 4 RRTO May 1, 1981 29 (91 21 '(6) 7 (2)
U RRWL, 3 RRTO Totals:
.118 (28) 208 (32)
-50~ (8) 48 RRWL, 76 RRTO Revised Totals? 110 (21) 221 (37) 60 (13)
II.
Vacant Land Gamma Radiation Surveys Total Number of Available Lots:
388 Lots + 66 Vacant City Blocksi Number of Requests for Lot Survey Received:
320 Lots + 51 Blocks 8
Sumary Table of NRC/ State Program Less Than Greater Than Greater Than 5 pCi/ gram 14.5 vR/hr
.14.5 uR/hr 22sRa or Greater Than Date Average Average 34.5 pR/hr Point Reading October 1, 1980 November 1,1980 19 2
December 1, 1980 8
4 January.1, 1981 0
0 February 1,1981 18 0
March 1,1981 6
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f.pril 1,1981 0
0 May 1, 1981 25 1
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3' One City bic.:k contains approximately 16 lots.
8 HUD criterion is that the grab Working Level (WL) times the factor 0.6 equais the Weighted Working Level (WWL) which 3ast be less than 0.02 WWL (0.033 WL X 0.6 = 0.02 WWL).
See the attached flow diagram for the signif-icance of these screening levels.
When the verified grab working level measurement-is greater than 0.033 WL, the property receives a detailed, engineering assessment to define what remedial action must be.taken; otherwise a ling-term monitoring program may be conducted to deternine if remedial action.;is required.
These are based on the average of two measurements.
RRWL mear.s a single measurement >0.'033 WL which must be verified.
RRTO means turnover time was too short (<32 minutes) which must be retested at least once.
These are the numbers of pending reruns generated each period.
I Numbers in parentheses indicate the number of measurements included in 5
the number without parentheses which are slated for engineering assess-ment due to failure of one or more of the other crite~ria (i.e. 225Ra in soil >5 pCi/g, gamma dose rate >20 pR/hr above background).
5 HUD criterion for Vacant Land is that the average ganna radiation dose rate level must be less than 14.5 pR/hr.
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7 Revised total as of April 30, 1981 reflects changes in the status of properties caused by rerun analyses.
It is based on data taken from the nester 109 "r
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