ML19106A226
| ML19106A226 | |
| Person / Time | |
|---|---|
| Site: | 07000925 |
| Issue date: | 11/05/2004 |
| From: | Condra D Oak Ridge Institute for Science & Education |
| To: | Munoz R Division of Nuclear Materials Safety IV |
| Shared Package | |
| ML19106A222 | List: |
| References | |
| Download: ML19106A226 (6) | |
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,j 0 RI SE OAK RIDGE INSTITUTE FOR SCIENCE ANO EDUCATION November 5, 2004 Mr. Rick Munoz U.S. Nuclear Regulatory Commission Region N: DNMS: NMLB Suite 400 611 Ryan Plaza Drive Arlington, TX 76011
SUBJECT:
ANALYTICAL RESULTS FOR WATER SAMPLES COLLECTED AUGUST 24 AND 25, 2004 FROM KERR McGEE CIMARRON, CIMARRON, OKLAHOMA (INSPECTION REPORT #070-00925/04-02)
[RFTA NO.04-001; 05-001)
Dear Mr. Munoz:
The Environmental Survey and Site Assessment Program (ES SAP) of the Oak Ridge Institute for Science and Education (ORISE) received 24 water samples on August 26, 2004 that were collected on August 24 and 25, 2004. A gamma spectroscopy scan was performed on each sample (Procedure CPI, Revision 14). The gamma scans did not indicate the presence of any radionuclides that are not associated with the site. All samples were analyzed for gross alpha, gross beta, and isotopic uranium. Tc-99 analysis was performed on the eight samples designated by you in the Request for Analysis. The results for gross alpha and gross beta (Procedures AP 1, Revision14 and CP3 Revision 2), Tc-99 (Procedure APS, Revision 15 and Procedure CP4, Revision 3), and isotopic uranium (Procedure APl 1, Revision 2 and Procedure CP2, Revision
- 12) are presented in Tables 1, 2, and 3, respectively. A case narrative is included that discusses the differences between the gross alpha and total uranium concentrations.
ESSAP's Quality Control (QC) requirements were met for these analyses. The QC files are available for your review upon request.
P. 0. BOX 117, OAK RIDGE, TENNESSEE 37831-0117 Operated by Oak Ridge Associated Universities for the U.S. Department of Energy t@),:
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Mr. Rick Munoz November 5, 2004 Please contact me at (865) 241-3242 or Wade Ivey at (865) 576-9184 with any questions or comments.
Sincerely, Dale Condra Laboratory Manager Environmental Survey and Site Assessment Program RDC/WPI:ar Enclosure cc:
T. McLaughlin, NRC/NMSS/TWFN 7F27 E. Knox-Davin, NRC/NMSS/TWFN T8A23 File/1619 E. Abelquist, ORISE/ESSAP T. Vitkus, ORISE/ESSAP
CASE NARRATIVE The gross alpha measurement is routinely used as a screening tool to determine the need for further analysis. The results of the specific isotopic analysis better represent the concentration of contamination in the sample due to lower total propagated uncertainties associated with the procedure. A comparison of gross alpha and any specific isotopic analysis will not always result in agreement. However, during the laboratory data review and comparison process, it was noted that several of the gross alpha concentrations and the total uranium concentrations were significantly different and the gross alpha concentrations were lower than the total uranium concentrations in almost every case. It is not uncommon for the concentrations from these analyses to differ statistically, but it is uncommon for the gross alpha concentrations to be consistently lower than the concentrations of uranium.
After discussing this problem with Rick Munoz on October 13, 2004, the decision was made to select several of the water samples and reanalyze them for gross alpha. The results of the reanalysis did not resolve the discrepancies between the original gross alpha and total uranium concentrations.
Re-evaluation of the analytical process indicated that the amount of solids in this set of water samples was higher than one would normally expect to find. Even with the use of relatively small sample volumes--20 to 25 mL-for the gross alpha analysis, the sample masses on the counting planchets were at the upper limit of the gross alpha efficiency/mass attenuation curve.
The alpha emissions from uranium were attenuated by the sample mass deposited on the counting planchets. This mass attenuation of the alpha emissions of uranium was the cause of the difference between the gross alpha concentrations and the total uranium concentrations.
ORISE TABLE 1 CONCENTRATIONS OF GROSS ALPHA AND GROSS BETA IN WATER SAMPLES BY LOW BACKGROUND ALPHA AND BETA COUNTING APl, REVISION 14; CP3, REVISION 2 CIMARRON (KERR-McGEE)
CIMARRON, OKLAHOMA NRC Region IV Concentrations ESSAP Sample NRC Region IV Sample (pCi/L)
ID Sample ID Description Gross Alphaa 1619W0001 04-02-01 Well 1336-A 28.0 +/- 6.2c 1619W0002 04-02-02 Well 1319-Cl 19.7 +/- 4.3 1619W0003 04-02-03 Well 1319-Bl 107.3 +/- 9.4 1619W0004 04-02-04 Well 1319-Al 14.4 +/- 3.2 1619W0005 04-02-05 Well 1319-B3 46.0 +/- 5.8 1619W0006 04-02-06 Well 1312 28.4 +/- 9.6 1619W0007 04-02-07 Well T-54 1.8 +/- 3.5 1619W0008 04-02-08 Seep 1208 6.2 +/- 7.4 1619W0009 04-02-09 Well T-57 14.5 +/- 5.4 1619W0010 04-02-10 Well 02W43 156 +/- 18 1619W0011
. 04-02-11 Well 02W37 335 +/- 38 1619W0012 04-02-12 Well 02W05 3,160 +/- 290 1619W0013 04-02-13 Well 02W04 1,920 +/- 150 1619W0014 04-02-14 Well TMW09 4,730 +/- 350 1619W0015 04-02-15.
Well 1315R 793 +/- 66 1619W0016 04-02-16 Seep 1206 106 +/- 13 1619W0017 04-02-17 Well TMW8 1,620 +/- 120 16I9W0018 04-02-18 Well TMW25 100 +/- 12 1619W0019 04-02-19 Well 02W47 354 +/- 32 1619W0020 04-02-20 Well 1352 762 +/- 62 1619W0021 04-02-21 Well 1356 106 +/- 13 1619W0022 04-02-22 Well T-77 235 +/- 32 I6l9W0023 04-02-23 Well T-67 171 +/- 23 1619W0024 04-02-24 Well T-63 29.9 +/- 9.9
- irhe average MDC for gross alpha for a 200 minute count for this sample set is 7.3 pCi/L.
'The average MDC for gross beta for a 200 minute count for this sample set is 8.6 pCi/L.
cUncertainties represent the 95% confidence level, based on total propagated uncertainties.
Gross Betab 733 +/- 75 11.6 +/- 3.0 23.0 +/- 2.8 53.4 +/- 5.2 20.2 +/- 2.5 451 +/- 55 528 +/- 55 2,120 +/- 240 368 +/- 38 63.1 +/- 9.0 133 +/- 19 1,120+/- 130 582 +/- 59 1,780 +/- 180
.557 +/- 57 50.4 +/- 7.7 1,080 +/- 110 38.8 +/- 6.6 115 +/- 14 483 +/- 49 80+/- 10 45 +/- 11 113+/-17 980 +/- 110
ORISE TABLE 2 CONCENTRATIONS OF Tc-99 IN WATER SAMPLES BY LIQUID SCINTILLATION ANALYSIS AP5, REVISION 15; CP4, REVISION 3 CIMARRON (KERR-McGEE)
NRC Region IV NRC Region IV ESSAP Sample ID Concentrations Sample ID Sample Description 1619W0001 04-02-01 Well 1336-A 1619W0006 04-02-06 Well 1312 1619W0007 04-02-07 Well T-54 1619W0008 04-02-08 Seep 1208 1619W0009 04-02-09 Well T-57 1619W0015 04-02-15 Well 1315R 1619W0016 04-02-16 Seep 1206 1619W0024 04-02-24 Well T-63 "The average MDC for Tc-99 for a 60 minute count using a 0.1 L sample is 15 pCi/L.
bUncertainties represent the 95% confidence level, based on total propagated uncertainties.
(pCi/L) 900 +/- 110b 700 +/- 85 910 +/- 110 2,630 +/- 310 522 +/- 64 11.3 +/- 8.9 14.6 +/- 9.1 1,300 +/- 160
ORISE TABLE 3 CONCENTRATIONS OF URANIUM ISOTOPES IN WATER SAMPLES BY ALPHA SPECTROSCOPY APll, REVISION 2; CP2, REVISION 12 CIMARRON (KERR-McGEE)
CIMARRON, OKLAHOMA NRC NRC ESSAP Sample Region IV Radionuclide Concentrationsa (pCi/L)
Region IV ID Sample Sample ID Description U-234 U-235 1619W0001 04-02-01 Well 1336-A 20.2 +/- 1.8c 0.88 +/- 0.28 1619W0002 04-02-02 Well 1319-Cl 22.0 +/- 2.1 0.91 +/- 0.32 1619W0003 04-02-03 Well 1319-Bl 112.3 +/- 8.6 4.73 +/- 0.77 1619W0004 04-02-04 Well 1319-Al 13.9 +/- 1.3 0.57 +/- 0.21 1619W0005 04-02-05 Well 1319-B3 63.4 +/- 5.2 3.70 +/- 0.66 1619W0006 04-02-06 Well 1312 2.19 +/- 0.47 0.14+/-0.19 1619W0007 04-02-07 Well T-54 38.6 +/- 3.4 1.89 +/- 0.46 1619W0008 04-02-08 Seep 1208 5.44 +/- 0.77 0.17+/-0.13 1619W0009 04-02-09 Well T-57 13.7 +/- 1.4 0.57 +/- 0.23 1619W0010 04-02-10 Well 02W43 117.5 +/- 8.7 6.70 +/- 0.91 1619W0011 04-02-11 We1102W37 244 +/- 18 13.1 +/- 1.4 1619W0012 04-02-12 Well 02W05 2,040 +/- 150 99 +/- 12 1619W0013 04-02-13 Well 02W04 1,100 +/- 110 63 +/- 14 1619W0014 04-02-14 Well TMW09 3,060 +/- 220 160 +/- 17 1619W0015 04-02-15 Well 1315R 1,209 +/- 88 73.4 +/- 9.2 1619W0016 04-02-16 Seep 1206 86.4+/- 6.8 4.02 +/- 0.68 1619W0017 04-02-17 WellTMW8 1,460 +/- 120 98 +/- 14 1619W0018 04-02-18 We11TMW25 125 +/- 10 7.1 +/- 1.3 1619W0019 04-02-19 Well 02W47 266 +/- 21 12.5 +/- 1.8 1619W0020 04-02-20 Well 1352 385 +/- 29 23.6+/- 2.7 1619W0021 04-02-21 Well 1356 176 +/- 14 8.0 +/- 1.4 1619W0022 04-02-22 Well T-77 188 +/- 15 9.4 +/- 1.5 1619W0023 04-02-23 Well T-67 162 +/- 13 7.7 +/- 1.4 1619W0024 04-02-24 Well T-63 36.6 +/- 3.6 1.71 +/-0.62 311le average MDC for individual uranium isotopes for a sixteen hour count using 0.01 L to 0.1 L of sample is 0.82 pCi/L.
bu Total is the sum ofU-234 + U-235 + U-238.
cuncertainties represent the 95% confidence level, based on total propagated uncertainties.
U-238 U Totalb 6.87 +/- 0.84 28.0 +/- 2.0 4.23 +/- 0.68 27.1 +/-2.2 16.9 +/- 1.6 133.9 +/- 8.8 3.22 +/- 0.49 17.7+/-1.4 10.4 +/- 1.2 77.5 +/- 5.3 0.91 +/- 0.34 3.24 +/- 0.61 12.2 +/- 1.3 52.7 +/- 3.6 1.60 +/- 0.37 7.21 +/- 0.86 5.02 +/- 0.68 19.3 +/- 1.5 68.4 +/- 5.3 193 +/- 10 146 +/- 11 403 +/- 21 1,170 +/- 87 3,270 +/- 170 629 +/- 66 1,790 +/- 130 1,930 +/- 140 5,160 +/- 260 756 +/- 56 2,040 +/- 110 23.9 +/- 2.2 114.4 +/- 7.2 1,600 +/- 130 3,160 +/- 170 82.6 +/- 7.0 215 +/- 12 113.l +/- 9.4 392 +/- 23 563 +/- 42 971 +/- 51 90.3 +/- 7.6 274 +/- 16 32.9 +/- 3.2
- 230+/- 15 49.3 +/- 4.6 219 +/- 14 12.5 +/- 1.7 50.7 +/- 4.1