ML18283A574

Submitting Data of Rainwater Samples from 12 Different Locations in Browns Ferry Area Taken on 8/4-5/1975

ML18283A574
Person / Time
Site:	Browns Ferry
Issue date:	09/03/1975
From:	Eric Thomas Tennessee Valley Authority
To:	Giambusso A, Moseley N Office of Nuclear Reactor Regulation, NRC/RGN-II
References
Download: ML18283A574 (5)

Text

J NRC DISTRIB TION FOR PART 50 DOCKET MATERIAL (TEMPORARY FORM)

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DATE OF DOC DATE REC'D LTR TWX RPT OTHER Chattanooga, Terms 'I E.Fo Thomas 9-3-75 9-9-75

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Samples from 12 Rainwater Samples taken on 8-46 5~1975 higher, than normal levels of 6 Co. were released.. ~ . ~

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+~eNeg September 3, 1975 Mr. A. Giambusso, Director Division of Reactor Licensing U.S. Nuclear, Regulatory= Commission Washin ton D C Mr. Norman C. Moseley, Director U.S. Nuclear Regulatory Commission Region ll 230 Peachtree Street, NW. Suite 818 Atlanta, GA 30303 Gentlemen:

Browns Ferry Nuclear Plant Technical Specifications specify that a measured level of radioactivity in any environmental medium other if than those associated. with gaseous radioiodine releases exceeds four times the control station value, a written notification will be submitted. within 30 days.

Twelve samples of rainwater from twelve different locations in the Browns Ferry area were taken on August 4 and. 5, 1975. Preliminary analysis of these samples on August 11, 1975, incLLcated that the sample 'from Athens, Alabama, 11 miles northeast of Browns Ferry, contained. approximately 40 pCi/g of 60Co. A more thorough analysis of the data was completed on August 18, 1975., indicating a concen-tration of 33.5 + 2.8 pCiP for that sample, while the concentration at a11 other stations ranged. from 0.8 + 1.6 to 5.69 + 1.8 pCi/A.

The concentration reported. in the sample collected at the control station at Sheffield., Alabama, was 4.2 + 1.9 pCi/S.

0 The general movement of thundezstorms in the area is from SSW to HNE.

A large number of'hunderstorms occurrecL during the month of July 1975.

Approximately 8 inches of rainfall were measured 'at Athens during the month.

Routine analysis of particulate filters from the turbine and reactor building exhausts during the month -of July indicated. higher than normal levels of 60Co. At no time did. these concentrations exceed.

reportable levels.

Rainwater collected at the'Athens, Alabama, station from August 4-19 was sampled. on August 19. Ana1ysis of'his sample revealed, no significant levels of radionuclides present i.n.,the sample.-

Or. r'2 An Equal Opportunity Employer

Mr. A. Giambusso .September 3, 1975 Mr. Norman C. Moseley It is concludecL from the above data that 60Co released. from Browns Ferry probably was caught up by a- passing stormcloud. an'd. washed. out in the Athens area. The result of the second. sample indicates that.,

the phenomenon was probably unique and not recu'rring.

C The occurrence represented, no hazard. to the public since the concentration reported. is only 0.1 percent of the 10 CFR 20 limits.

Very truly yours, TENNESSEE VALLEY AUTHORITY E. F. Thomas Director of Power Production