NUREG-1537, Part 2 - NRC

CHAPrER4
calculational models and assumptions should be justified by similar
comparisons. New shielding materials should bejustified by calculations,
development testing, and the biological shield test program during facility
startup.
The analyses should include specific investigation of the possibilities of
radiation streaming or leaking from shield penetrations, inserts, and other
places where materials of different density and atomic number meet. Any
such streaming or leakage should not exceed the stated limits.
* The shielding at experimental facilities, such as out-of-service beam tubes,
should be sufficient to match the shielding factors of the gross surrounding
shield.
* Supports and structures should ensure shield integrity, and quality control
methods should ensure that fabrication and construction of the shield
exceed the requirements for similar industrial structures.
* Technical specifications, if required, should be proposed according to the
guidance in Chapter 14 of the format and content guide, which proposes
limiting conditions for operation and surveillance requirements. The
applicant should justify the proposed technical specifications in this section
of the SAR.
Review Procedures
The reviewer should confirm that the objectives of the shield design bases are
sufficient to protect the health and safety of the public and the facility staff; and
that the design achieves the design bases. The reviewer should compare design
features, materials, and calculational models with those of similar non-power
reactors that have operated acceptably.
Evaluation Findings
This section of the SAR should contain sufficient information to support the
following types of conclusions, which will be included in the staffs safety
evaluation report:
* The analysis in the SAR offers reasonable assurance that the shield designs
will limit exposures from the reactor and reactor-related sources of
radiations so as not to exceed the limits of 10 CFR Part 20 and the
guidelines of the facility ALARA program.
NUREG-1537, PT 2 4-18 REV 0,2/96
NUREG-1537, PART 2 4-18 REV 0, 2/96
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