ML101930456

E-mail from Bonser, Brian to Hamilton, Ruben Re CST Sample Results

ML101930456
Person / Time
Site:	Browns Ferry
Issue date:	04/08/2010
From:	Brian Bonser NRC/RGN-II
To:	Hamilton R NRC/RGN-II
References
FOIA/PA-2010-0209
Download: ML101930456 (1)

Text

Page 1 of 1 From: Bonser, Brian Sent: Thursday, April 08, 2010 11:48 AM To: Hamilton, Ruben

Subject:

FW: CST sample results For inclusion in the groundwater data base From: Gepford, Heather Sent: Thursday, April 08, 2010 11:25 AM To: Wert, Leonard; Lubinski, John; Ross, Thierry; Kontz, Craig; Guthrie, Eugene Cc: Bonser, Brian

Subject:

CST sample results Just to clarify, the values provided were reported in the units which the counting systems produce output. Because the limits are in terms of pCi/I, I have included those values as well.

A sample of the CST water was taken and analyzed, with the following results:

Isotope Activity (uCi/ml) Activity (pCi/I) LLD (pCi/I) Reporting Level (pCi/I)

Tritium 2.03E-3 uCi/ml 2.03E+6 pCi/I 2000 20,000 Co-60 8.90E-5 uCi/ml 8.90E+4 pCi/I 15 300 Co-58 3.22E-6 uCi/ml 3.22E+3 pCi/I 15 1000 Mn-54 3.40E-6 uCi/mI 3.40E+3 pCi/I 15 1000 Cs-137 3.50E-6 uCi/ml 3.50E+3 pCi/I 18 50 To give a relative idea of the magnitude of these numbers, I have provided the LLDs and reporting levels for surface/drinking water samples. If no drinking water pathway exists, the reporting level for tritium is 30,000 pCi/I.

These numbers do not have a direct correlation to how much activity is in the soil, as a number of physical processes will affect the migration of the radioisotopes. In addition, no reporting level for soil is given in Browns Ferry's Offsite Dose Calculation Manual.

§33 file://G:\DRSII\PSB l\Access Databases\Tritium Database\BrownsFerry\Event Related\FW CS... 5/8/2010