Preliminary earth berm shielding calculations for the accelerator production of tritium 1700-MeV accelerator

Conference · Wed Jul 01 04:00:00 EDT 1998

OSTI ID:663208

Court, J D; Pitcher, E J; Ferguson, P D; Russell, G J; Patton, B W

The authors have performed calculations using the LAHET Code System (LCS) to obtain an estimation of the amount of earth berm shielding that will be required for the 1700-MeV proton accelerator proposed for the Accelerator Production of Tritium (APT) Project. A source scenario of 10 nA/m beam loss along the beam line was used to calculate the dose values above a 6-m earth berm from high-energy neutrons, low-energy neutrons, and photons. LAHET, a Monte Carlo based particle transport code, was used to transport a 1700-MeV protons from the beam along a divergence path of 1{degree} from the original beam direction and impacting representative beampipe material along a 300-m beamline. LAHET was then used to track all high-energy neutron production until the neutrons either escape the berm shield, or scatter down in energy to 20 MeV, where their parameters were then written to a source file for MCNP. Photon production data was also written to a source file used by MCNP. MCNP transported all neutrons and photons from the LAHET source file until they (1) were absorbed, scattered down to an energy cutoff, or (2) escaped from the system. Doses were calculated from surface flux tallies obtained from LAHET and MCNP. These doses were then compared to earlier Moyer model calculations.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 663208
• Report Number(s): LA-UR--98-257; CONF-971125--; ON: DE98003476
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
BIOLOGICAL SHIELDS
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
EARTH BERMS
ISOTOPE PRODUCTION
RADIATION DOSES
TRITIUM