ML061000123
| ML061000123 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 12/08/2005 |
| From: | Gumnick J - No Known Affiliation |
| To: | Ainger K, Hersey K, Melby H, Roberson J, Thompson D, Vickers R Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2006-0115 | |
| Download: ML061000123 (1) | |
Text
Haeger, Allan R.
From:
Gumnick, John Sent:
Thursday, December 08, 2005 11:34 AM To:
Vickers, Robert G.; Thompson, David A.
Cc:
Rybak, Bohdan; Haeger, Allan R.; Ainger, Kenneth A.; Roberson, Jessie; Melberg, Peg; Hersey, Kevin K.
Subject:
Potential ODCM Pathways
- Group, Please review the following calculations.
Two credible dose pathways attributable to the Braidwood tritium plume are drinking water and consumption of sport fish.
The conclusion is that dose to the public from drinking water and consumption of sport fish would be orders of magnitude below any applicable Federal limits.
Assumptions:
- 1.
The tritium concentation in the fish body water* equal to 90% of the tritum concentration in the pond (From ODCM App.C Table C-8), which is assumed to bqwhich equals 2.52E-10 mCig of fish.
- 2.
A maximally exposed individual consumes 2 kg of fish a year, or 21,000 g/year. (From Reg Guide 1.109)
Calculating, 2.52E-1 0 mCVg fish x 21,000 g fish/year = 5.29 E-6 mCVyear total tritium ingested 5.29E-6 mCi/year x 62.5 mrem/mCi (From NUREG 4013) = 3.31 E-4 mrem/year £YtI
_ 1 4
/i For the drinking water pathway, the ODCM postulates a consumption of two liters per day. (From Reg Guide 1.109) The most contaminated drinking water well was 1280 pCiA.
Calculating, b
lt
{lf 4 mrem/year/20,000 pCi/A x 1280 pCi/A = 0.256 mrernmyear.
'- t_
f q v This is considerably less than the performance indicator value of 1.5 mrem/quarter.
Id All other credible pathways such as milk, recreation and irrigation would be small fractions of the drinking water dose.
Call me if you have any questions,
,AC/,T) I.(5 John Gumnick I
I.P4 630-843-1613 Ck5 hi C¢>w) l
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