NUREG-1537, Part 2 - NRC

CHAPTER 4
Anticipated rearrangements of core components should account for
uranium burnup, plutonium buildup, and poisons, both fission product and
those added by design, for the life of the reactor. All operating core
configurations should be compact, allowing no space within the core large
enough to accept the addition of a fuel element or the addition of reactivity
beyond that analyzed and found acceptable in Chapter 13 of the SAR.
The analyses should show initial and changing reactivity conditions, control
rod reactivity worths, and reactivity worths of fuel elements, reflector
units, and such incore components as experimental facilities for all
anticipated configurations. There should be a discussion of administrative
and physical constraints that would prevent inadvertent movement that
could suddenly introduce more than one dollar of positive reactivity or an
analyzed safe amount, whichever was larger These analyses should
address movement, flooding, and voiding of core components.
The reactor kinetic parameters and behavior should be shown, along with
the dynamic reactivity parameters of the instrumentation and control
systems. Analyses should prove that the control systems will prevent
nuclear transients from causing loss of fuel integrity or uncontrolled
addition of reactivity.
* The analyses should show that the control systems would prevent reactor
damage if incore experimental facilities were to flood or void. This could
be shown by reference to the analysis in Chapter 13 of the SAR.
* The information should include calculated core reactivities for the possible
and planned configurations of the reactor core and control rods. If only
one core configuration will be used over the life of the reactor, the
applicant should clearly indicate this. For reactors in which various core
configurations could be operated over time, the analyses should show the
most limiting configuration (the most compact core and highest neutron
flux densities). This information should be used for the analyses in
Section 4.6 of the SAR.
* 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, and should
be justified in this section of the SAR.
Review Procedures
The reviewer should confirm that a complete, operable core has been analyzed.
NURBG-1537,PART2 4-20 REv. 0,2/96
NUREG-1537,PART2 4-20 REV. O. 2/96
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