ML19106A242
| ML19106A242 | |
| Person / Time | |
|---|---|
| Site: | 07000925 |
| Issue date: | 04/02/2002 |
| From: | Condra D Oak Ridge Institute for Science & Education |
| To: | Jacqwan Walker NRC Region 4 |
| Shared Package | |
| ML19106A222 | List: |
| References | |
| Download: ML19106A242 (3) | |
Text
- -
April 2, 2002 Ms. Judith Walker A
ORI SE OAK RIDGE INSTITUTE FOR SCIENCE AND EDUCATION U.S. Nuclear Regulatory Commission Region IV Harris Tower 611 Ryan Plaza Drive - Suite 400 Arlington, TX 76011-8064
SUBJECT:
REVISION 1 TO THE REPORT FOR ANALYSIS OF THE WATER SAMPLES FROM KERR-MCGEE
Dear Ms. Walker:
This letter is to report revised Tc-99 concentrations due to the reanalysis of five of the 13 water samples from Kerr-McGee Cimarron. The Environmental Survey and Site Assessment Program (ESSAP) of the Oak Ridge Institute for Science and* Education (ORISE) received 13 water samples collected on September 5, 2001 at the Kerr-McGee Cimarron facility in Crescent, Oklahoma. ESSAP reanalyzed five water samples after discussions with the licensee's laboratory failed to identify any obvious error that would account for the observed differences in the analytical data generated by each laboratory.
A comparison of the two Tc-99 data sets indicated the concentrations of two of the samples, W003 and W009, were significantly different.
A review of the analytical process was conducted. The review indicated that these samples were probably cross contaminated during the first batch of analytical work.
es We apologize for this error.
Cross contamination incidents are very rare in our laboratory, however, we are talcing steps to increase our quality control program to further minimize such situations. A nonconformance was initiated and followup actions will be communicated to John Buckley.
The five water samples were reanalyzed for Tc-99 (Procedure AP5 Rev. 11 and CP4 Rev. 1) and the data are provided in the attached table. Emilio Garcia (NRC/Region IV) requested that only the revised Tc-99 data table for the five water samples be submitted with this revised letter report.
ESSAP' s Quality Control (QC) procedures were followed for these analyses. The daily QC and detector background for the counting instrumentation used in the analyses were within acceptable limits.
P. 0. BOX 117, OAK RIDGE, TENNESSEE 37831-0117 Operated by Oak Ridge Associated Universities for the U.S. Deportment of Energy
Ms. Judith Walker April 2, 2002 Please contact me at (865) 241-3242 or Wade Ivey at (865) 576-9184 should you have any questions.
Sincerely, 0-..L~
Dale Condra Laboratory Manager Environmental Survey and Site Assessment Program RDC:WPI:ar Attaclunent cc:
G. Purdy, NRC/NMSS/TWFN 7F27 E. Knox-Davin, NRC/NMSS/TWFN 8A23 E. Garcia, NRC/Region IV W. Beck, ORISE/ESSAP E. Abelquist, ORISE/ESSAP T. Vitkus, ORISE/ESSAP File/796
TABLE1 REVISED CONCENTRATIONS OF TECHNETIUM;-99 IN SELECTED WATER SAMPLES KERR-McGEE CIMARRON CRESCENT, OKLAHOMA ESSAPID I
NRC R-IV ID I Tc-99 Concentrations (pCi/L) 796W003 TMW-13-1284 30 +/- 10 8
796W006 1336A-1287 840+/-70 796W007 1208-1288 2530 +/- 190 796W009 1206-1290 20+/- 10 796W010 1312-1291 780+/-60
'Uncertainties represent the 95% confidence level, based on total propagated uncenainties.