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ALPHA Project Safety Assessment Document

ALPHA Project Safety Assessment Document. Vladimir Anferov. Regulatory Requirements. SAD Contents.

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ALPHA Project Safety Assessment Document

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  1. ALPHA Project Safety Assessment Document Vladimir Anferov

  2. Regulatory Requirements

  3. SAD Contents • A Safety Assessment Document (SAD) must identify hazards and associated onsite and offsite impacts to workers, the public, and the environment from the facility for both normal operations and credible accidents [4.a.(1)] • The SAD must contain sufficient descriptive information and analytical results pertaining to specific hazards and risks identified during the safety analysis process to provide an understanding of risks presented by the proposed operations [4.a.(2)] • The SAD must provide appropriate documentation and detailed description of engineered controls (e.g., interlocks and physical barriers) and administrative measures (e.g., training) taken to eliminate, control, or mitigate hazards from operation [4.a.(3)]

  4. Risk Assessment Methodology • Rate probability of each hazard (A<0.01/year, B=0.01 to 0.1, C>0.1/year) • Rate consequence/impact level (1-Low, 2-Medium,3-High) Risk Matrix Risk Levels Consequence Probability

  5. Consequences / Impacts Values DOE 5480.25 guidance defines negligible, minor and major impacts: • “Major” is that level of impact at which permanent health effects or environmental damage could occur. (Criteria: injuries that require extensive professional medical attention; > 25 rem effective dose equivalent); • “Minor” is that level of impact at which permanent health effects or environmental damage are not expected. (Criteria: minor injuries; 1 - 25 rem effective dose equivalent); • “Negligible” is that level of impact at which the potential for health effects or environmental damage is very slight. (Criteria: injuries requiring only superficial professional medical attention; < 1 rem effective dose equivalent).

  6. SAD Summary

  7. Radiation Protection Radiation Sources: • Linac exit • Injection beam line • Lambertson magnet • Ring section • Ring section • Ring section • Extraction beam line • Test area transport line • Sample position

  8. Radiation Sources Conversion Rates from NCRP Report 144: Forward Gamma: Leakage Gamma: Neutrons:

  9. Attenuation in shielding barriers For 40-50 MeV electrons attenuation by a factor of 10 (TVL) :

  10. Shielding Design Goals Normal Operation: • General public exposure limit in uncontrolled areas to below 0.05 mrem/hr • Users and Staff exposure limit in uncontrolled areas to below 0.25 mrem/hr Maximum Credible Incident • Integrated dose equivalent below 2 mrem outside the shielding barriers.

  11. Accelerator Safety Envelope ASE = Operating Limits Ref Beam Energy 50 MeV Ref Beam Current 0.5 A Ref Beam Duty factor 10Hz ×10msec Maximum beam power 2500 Watts

  12. Normal Operation

  13. Maximum Credible Incident MCI represents loss of an entire beam in a single accelerator component (location).

  14. Conclusions • SAD lists all hazards • Ionizing radiation hazards are mitigated by shielding design, interlock system, beam loss monitoring and training. • Non-ionizing radiation hazards are mitigated by following safety codes and training.

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