A Reed Tool Compsny 73JA drill bit used in the Geysers geothermal field failed primarily because of severe frictional wear of the nose bearing. There is no indication that well temperature by itself caused failure of any part of the bit. However, the high well temperature together with the friction heat generated produced a temperature which lead to softening and premature wear failure of the nose bearing.

Progress is reported on research projects in the fields of radiation protection, industrial hygiene, instrument development, fire safety, decontamination, and environmental protection. (HLW)

Measurements were made of the neutron spectrum produced by bombarding a thick beryllium target with 30-MeV deuterons at the University of California, Davis cyclotron. This spectrum is of interest in studying the effect of neutrons on materials to be used in future fusion reactors. The spectrum was inferred from the activation of two sets of detector foils placed at 0/sup 0/ to the deuteron beam, one immediately behind the beryllium target block, and one 40 mm to the rear. A least-squares program was used to analyze the foil activation data to obtain the fluence in each of seven energy groups. The neutron spectrum (fluence/MeV) close to the target decreases continuously with energy in the range 5-32 MeV, while the spectrum 40 mm back has a peak at about 13 MeV. The contribution from neutrons of energies less than 10 MeV is much greater than that found in previous spectral measurements made at large distances from the target. This difference is attributed to the neutrons which are emitted at large angles from the deuteron beam. These observations show the importance of evaluating the neutron spectrum near the target if samples of materials are to be irradiated in this location. (auth)