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The f u e l assemblies were damaged t o the extent t h a t the uranium polystyrene mixture on t h e sirconium strips was no,longer i n usable cond i t i o n and had t o be reclaimed k e d i a t e l y r a t h e r than after the experfments planned f o r the reactor. Seventy-five percent of the fuel on hand was not involved i n the incident. The reactor tank and fixtures were undamaged, 3. The program was delayed due t o the l o s s of personnel available f o r t h i s operation as a r e s u l t of the incident, and by the time required t o r e v i s e operating procedures t o insure complete safety i n the future.

Remarks T h i s incident i l l u s t r a t e s the necessity of extreme care in the ident i f i c a t i o n and control of radioactive wastes discharged into public sewer and drainage systems. Ames, Iowa July 1951 t o Aug. 1952 - 34 - EXCESSIVE I N m ! l ' A L DOSE OF PLUTONIUM Nature of Incident Q An employee received one and one-half times the maximum permis- sible l i m i t of plutonium in the body. Description of Operation EInployee was doing semi-routine maintenance work on plutonium contaminated equipment.

Description of b e r a t i o n The operation being conducted was the comparison of a s e r i e s o f newly-manufactured control rods. The reactor had been operated Kith the standard control rod. It was then shut down by i n s e r t i n g a l l cont r o l rods and draining the water moderator, a standard safe method of shutting down the reactor when core changes a r e t o be made. The standard rod was removed and the first of the s e r i e s of control rods t o be t e s t e d was inserted. The reactor was f i l l e d with water with the t e s t control rod f u l l y i n and the standard type control rods f u l l y inserted.

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