Attachment #4





MARTIN MARIETTA ENERGY SYSTEMS. INC.


Mr. Jimmie C. Hodges, Acting Site Manager
Paducah Operations Office
Department of Energy
Post Office Box 1410
Paducah, Kentucky 42002-1410

Dear Mr. Hodges:

Radiation Release Experiments

A systematic review of the Paducah Gaseous Diffusion Plant (PGDP 
January 4, 1994 request for information on deliberate release of 
radioac or experimental exposure to humans. A similar request was made 
by January 4, 1994 letter. "Independent Review of Human Medical and S. 
Radiation Release Experiments." The information being provided to you 
of Martin Marietta Energy Systems, Inc. (MMES) under separate 
consolidated response to Joe LaGrone.

The file search at PGDP was performed by several organizations 
including Services, Inc. (MMUS) Records Management; MMUS Library; MMUS 
Technical Services; MMUS Safeguards, Security, and Emergency Service 
Staff. In addition, a number of retirees were questioned to assist in 
the

Information relating to radiation releases due to operation of the 
gaseous support facilities is not included in this document.

No record of any type was found on any experimental exposure to 
hum____.

Evidence was found of deliberate experimental releases of UF6 to the a 
1974.

The 1955 releases are referenced in an April 17, 1973 memo (Attach 
Materials Control and Accountability summarizing material releases an 
1, 1952 and July 1, 1972.  The two 1955 events are labeled as an 
experimental work June 30, 1955 (material release report number 0604 a 
0.68 kilogram release done as experimental work July 13, 1955 
(material salvage yard. A file listing seven negatives of a "gas 
(P.G.) release dem was also found; negatives 1 and 2 were not found, 
but prints of the ren





(Attachment 2). The unclassified term P.G. (process Gas) was used ins
UF6. The photographs appear to correspond to the June 30, 1955 release 
1973 memo to file. In addition, an entry in the shift superintendent's 
1955, also documents that the experiment was conducted to "enable 
better. No other information has been found reporting the July 13, 
1955 release.

A file listing 13 negatives of a "controlled P.G. release" dated 
January all 13 photographs are attached (Attachment 4). The 1974 
releases appe notes issued January 6, 1975 and March 26, 1975. The two 
staff notes reference as report KY-795 dated January 6, 1994 
(Attachment 5). The report KY-L-624, "The Application of the Gaussian 
Plume Equation to (Attachment 6). The author (who retired in 1976) was 
contacted and he re performed in that time frame with SF6 and UF6 to 
help verify plume mode have been found in the Nuclear Materials 
Control and Accountability file.

Please contact me if you have any questions.

                    Sincerely,



                    
                    Jimmy C. Massa
                    Paduch ERWM

JCM:as

Attachments 6

cc/att:   PDGP ERWM Document Management Center-RC
          File

cc:  M.F.P. DeLozier, OAK RIDGE
     L.E. Hall, OAK RIDGE
     D.L. Mason, OAK RIDGE
     S. Piston
     T.H. Row, OAK RIDGE