The QIKR instrument is a reflectometer intended to primarily investigate liquid samples. Although solid samples may also be used, most samples will be liquids with a free surface that cannot be inclined relative to horizontal. To provide an incident angle for the neutron beam on these surfaces, the beam itself is inclined. QIKR has two separate neutron beam paths, QIKR-U and QIKR-L, that each operate as an independent beamline. QIKR-U is angled upward from horizontal by 2.5° and QIKR-L is angled downward from horizontal by 2.5°. QIKR-U and QIKR-L share a maintenance shield, which actuates to either allow neutrons to pass (operating position) or to block the guide and allow safe access to the bunker when the proton beam is off (maintenance position). Each beam path has its own end station, and the two end stations are located in a single shielding cave that has an intermediate dividing wall which separates the space into two rooms, each with their own personnel entrance.
This PDR will cover the shielding components of QIKR, but a primary focus of the review will be the shielding cave and the neutronics analyses which support it. Additionally, upstream components, including the monolith and bunker wall inserts, will be discussed.
Charge Questions:
- Is the scope of the shielding included in this design review clearly defined?
- Are the shielding requirements adequately defined?
- Does the analyzed design of QIKR caves shielding adequately meet the radiation protection requirements and the Second Target Station (STS) Project Radiation Safety Policy and Plan?
- Have the radiation source terms against which QIKR shielding must provide protection been adequately defined?
- Are shielding calculations explained and documented in materials available to safety reviewers?
- Does the committee feel the design changes implemented or proposed in some of the shielding components should be further evaluated during final design?
