March 28th, 2011 – TEPCO Sampling of Water from Reactor 2 Yields Fission Products

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From: Mendiola, Anthony
Sent: Monday, March 28, M
To: Clifford, Paul; Attard, Anthony; Heller, Kevin; Kaizer, Joshua; Lehning, John; Orechwa, Yuri;
Panicker, Mathew; Proffitt, Andrew; Tony Attard (HOME); Ward, Leonard; Wu, Shih-Liang
Subject: RE: Contamination Question AND ANSWER

I think that these isotopes have been added because of the addition of seawater because of the accident. In a BWR, integrity of the condenser tubes is evaluated by sampling the effluents for other elements, which ones I do not recall, but I doubt that it was these ones.

I just read that they have found radioactive Iodine, Cesium, Ruthenium and Tellurium in the sea surrounding the power station, which means one of the stations is leaking Radioactive Seawater.

From: Clifford, Paul~-ý~
Sent: Monday, March , , 2011 11:08 AM
To: Mendiola, Anthony; Attard, Anthony; Heller, Kevin; Kaizer, Joshua; Lehning, John; Orechwa, Yuri; Panicker, Mathew;
Proffitt, Andrew; Tony Attard (HOME); Ward, Leonard; Wu, Shih-Liang
Subject: RE: Contamination Question AND ANSWER

Are these additional isotopes part of the normal chemical analysis (unrelated to accident)? If so, probably to evaluate integrity of condenser tubes.

From: Mendiola, Anthony
Sent: Monday, March 28, 2011 11:00 AM
To: Attard, Anthony; Heller, Kevin; Kaizer, Joshua; Lehning, John; Orechwa, Yuri; Panicker, Mathew; Proffitt, Andrew;
Tony Attard (HOME); Ward, Leonard; Wu, Shih-Liang; Clifford, Paul
Subject: Contamination Question AND ANSWER

I think we have an answer:
Most of the “extra credit” elements are found in seawater. If they are found to be radioactive, it would imply that the seawater has been thru the core. As they were found in the Reactor building, that would imply a primary leakage path.

From: Panicker, Mathew
Sent: Monday, March 28, 01 10:47 AM
To: Mendiola, Anthony
Cc: Heller, Kevin; Kaizer, Joshua; Lehning, John; Orechwa, Yuri; Proffitt, Andrew; Tony Attard
(HOME); Ward, Leonard; Wu, Shih-Liang; Attard, Anthony
Subject: RE: Contamination Question

Almost all of them listed are fission products. An exhaustive list of FPs can be found in Lamarsh, and/or in the ORNL code manual for the SCALE computer code system, or in the MCNP manual

Regarding the Co isotopes, some of them Co-59, Co-60 are also products from nuclear reactions (n,gamma) of impurities fro Steel (Iron).

Some others may also from the nuclear reactions of elements contained in the sea water which was poured over the units during the Japanese attempt to cool the reactor?

Reports in India is that the radiation level near the reactors are excessively high.
-Mathew

From: Mendiola, Anthony i-LL –
Sent: Monday, March 28, 2011 7:57 AM
To: Attard, Anthony; Heller, Kevin; Kaizer, Joshua; Lehning, John; Orechwa, Yuri; Panicker, Mathew; Proffitt, Andrew;
Tony Attard (HOME); Ward, Leonard; Wu, Shih-Liang
Subject: Contamination Question

Here is a simple question.

The Japanese have sampled the water found in the basement of Unit 2 for the following Isotopes:

Cobalt -56, 58, 60
Mo – 99
Tc – 99
Ru -106 (Ruthenium)
Ag -108 (Silver)
Te – 129, 132 (Tellurium)
1-131, 132, 134
Cs-134, 136,137
Barium – 140
La -140 (Lanthanum)

Does anyone have any idea why are they sampling for Lanthanum, Barium, Silver, Tellurium, and Ruthenium?

Specifically, what materials in the core would generate these isotopes?

Do not spend a lot of time on this, just looking for quick answers. Let me know if you find anything.

Anthony Mendiola
Chief, Nuclear Performance and Code Review Branch
SNPB/DSS/NRR/NRC
(301) 415-1054

 

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