title: Target station shielding issues at the spallation neutron source.
abstract: Recent spallation neutron source shielding activities in support of the neutron beam shutters and the hot cell walls are presented. Existing neutron beam shutters can be replaced with concrete at low power or with concrete and steel at approximately 500 kW of beam power. Potential voids in the hot cell walls are analysed to determine the impact on dose rates as a function of void size. A change in the type of shielding work is noted as the project moved from the early design stages as a 'green field' site to the current stage as a construction project nearing completion, where issues to be addressed are approaching retrofit-type analyses.
authors.affiliation: Spallation Neutron Source, Oak Ridge National Laboratory, 701 Scarboro Road, Oak Ridge, TN 37830-6474, USA. fergusonpd@ornl.gov
authors.forename: P D
authors.initials: PD
authors.lastname: Ferguson
authors.forename: F X
authors.initials: FX
authors.lastname: Gallmeier
authors.forename: E B
authors.initials: EB
authors.lastname: Iverson
authors.forename: I I
authors.initials: II
authors.lastname: Popova
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005160:Facility Design and Construction / Q000295:instrumentation* / Q000379:methods; D009502:Neutrons; D010315:Particle Accelerators; D011522:Protons; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000379:methods*; D011835:Radiation Protection / Q000295:instrumentation* / Q000379:methods; D018570:Risk Assessment / Q000379:methods*; D012307:Risk Factors
chemical_list: D011522:Protons