ML050210212

Ltr to Scott Atwater, Us NRC, Riv from Dale Condra, Laboratory Manager, Orise, Analytical Results from Soil Samples Collected 10/25 & 28/2004 from Rancho Seco - IR 050-312/2004-04, Rfta No.05-001, 01/12/2005

ML050210212
Person / Time
Site:	Rancho Seco
Issue date:	01/12/2005
From:	Condra D Oak Ridge Institute for Science & Education
To:	Atwater S NRC/RGN-IV/DNMS/FCDB
References
IR-04-004
Download: ML050210212 (4)

Text

O R h E O A K R I D G E INSTITUTE F O R S C I E N C E AND E D U C A T I O N January 12,2005 Mr. Scott Atwater U.S. Nuclear Regulatory Commission RGN-IV/DNMS/FCDB Suite 400 6 11 Ryan Plaza Drive Arlington, TX 7601 1

SUBJECT:

ANALYTICAL RESULTS FOR SOIL SAMPLES COLLECTED OCTOBER 25 AND 28,2004 FROM RANCHO SECO - SMUD, HERALD, CALIFORNIA (INSPECTION REPORT #50-312/2004-04) [RFTA NO.

05-0011

Dear Mr. Atwater:

The Environmental Survey and Site Assessment Program (ESSAP) of the Oak Ridge Institute for Science and Education (ORISE) received eight soil samples on November 2,2004 that were collected from October 25, 2004 through October 28,2004 at Rancho Seco - SMUD. Four of the samples were received in Marinelli beakers and were analyzed for cobalt-60 and cesium-137 by gamma spectroscopy (GS) (Procedure CP1, Revision 14). The remaining four samples were received in scintillation vials and were analyzed for carbon- 14 and tritium by liquid scintillation analysis (LSA) (Procedure AP6, Revision 14; CP4, Revision 3). The GS and LSA data are presented in Tables 1 and 2, respectively.

ESSAPs Quality Control (QC) requirements were met for these analyses. The QC files are available for your review upon request.

This letter report was delayed due to problems with the counting and processing instrumentation used in the carbon-14 and tritium analytical process. We apologize for this delay and hope that the delay has not placed an undue burden on your report process.

P. 0. BOX 1 17, OAK RIDGE, TENNESSEE 37931.01 17 Operated by Oak Ridge Associated Universities for the U.S. Department of Energy

MY. Scott Atwater January 12, 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 E. Garcia, NRC Region IV E. Abelquist, ORISE/ESSAP T. Vitkus, ORISE/ESSAP FileA636 Distribution approval and concurrence: Initials Technical Management Team Member Qk-&

Quality Manager I O-iQ

ORISE TABLE 1 SELECTED GAMMA EMITTING RADIONUCLIDE CONCENTRATIONS IN SOIL SAMPLES BY GAMMA SPECTROSCOPY PROCEDURE CP1- REVISION 14 RANCHO SECO - SMUD 11/04 HERALD, CALIFORNIA

~

ESSAP NRC REGION Sample ID IV Sample ID CO-60 CS-137 1636S0002 SB8120070DS01 0.04 f 0.03D 0.86 f 0.07 1636S0004 SB8120070DS05 0.02 f 0.02 0.06 5 0.02 1636S0006 SB8120070DS10 0.00" f 0.01 0.09 f 0.02 163680008 SB8120070DS14 0.01 % 0.01 0.09 f 0.02

~ ~ ~ ~~~

"The aveiage MDC for Co-60 I S 0 03 pCi/g and for (3-137 is 0 02 pCi/g bUncertamtiesrepresent the 95% confidence level, based 011 total piopagated uncertainties

'Zeio value is due to rounding

ORISE TABLE 2 CONCENTRATIONS OF TRITIUM (H-3) AND CARBON-14 (C-14)

BY LIQUID SCINTILLATION ANALYSIS PROCEDURE AP6, REVISION 14; PROCEDURE CP4, REVISION 3 RANCHO SECO - SMUD 11/04 HERALD, CALIFORNIA Radionuclide ESSAP NRC REGION IV Concentrations" Sample ID Sample ID (pCi/g wet weight) 5.7 4z 2.0 "lie average MDC for 1-1-3 is 5.6 pCi/g wet weight and for C-14 is 3.2 pCi/g wet weight.

bUiicertainties represent the 95% confidence level, based on total propagated uncertainties.