<liclass="toctree-l1 current"><aclass="current reference internal"href="#">CSAS5: Control Module For Enhanced Criticality Safety Analysis Sequences With KENO V.a</a><ul>

<liclass="toctree-l3"><aclass="reference internal"href="#sample-problem-1-keff-calculation">Sample problem 1: <em>k</em><sub>eff</sub> calculation</a></li>

<liclass="toctree-l3"><aclass="reference internal"href="#sample-problem-2-optimum-pitch-search-using-detailed-geometry">Sample problem 2: optimum pitch search using detailed geometry</a></li>

<liclass="toctree-l3"><aclass="reference internal"href="#sample-problem-3-optimum-pitch-search-using-homogenized-geometry">Sample problem 3: optimum pitch search using homogenized geometry</a></li>

<liclass="toctree-l3"><aclass="reference internal"href="#sample-problem-4-search-for-a-specified-value-of-keff">Sample problem 4: search for a specified value of <em>k</em><sub>eff</sub></a></li>

<liclass="toctree-l3"><aclass="reference internal"href="#sample-problem-5-solution-conc-search-for-a-specified-keff">Sample problem 5: solution conc. search for a specified <em>k</em><sub>eff</sub></a></li>

<liclass="toctree-l3"><aclass="reference internal"href="#sample-problem-6-dimension-chord-search-for-a-specified-keff">Sample problem 6: dimension chord search for a specified <em>k</em><sub>eff</sub></a></li>

<liclass="toctree-l3"><aclass="reference internal"href="#sample-problem-7-two-material-conc-search-for-a-specified-keff">Sample problem 7 two material conc. search for a specified <em>k</em><sub>eff</sub></a></li>

<liclass="toctree-l3"><aclass="reference internal"href="#sample-problem-8-k-for-a-pebble-bed-fuel">Sample problem 8: k<sub>∞</sub> for a pebble bed fuel</a></li>

</ul>

</li>

<liclass="toctree-l2"><aclass="reference internal"href="#warning-and-error-messages">Warning and error messages</a></li>

</ul>

</li>

<liclass="toctree-l1"><aclass="reference internal"href="CSAS5App.html">Additional Example Applications of CSAS5</a></li>

<liclass="toctree-l1"><aclass="reference internal"href="CSAS6.html">CSAS6: Control Module for Enhanced Criticality Safety Analysis with KENO-VI</a></li>

<liclass="toctree-l1"><aclass="reference internal"href="CSAS6App.html">Additional Example Applications of CSAS6</a></li>

<liclass="toctree-l1"><aclass="reference internal"href="STARBUCS.html">STARBUCS: A Scale Control Module for Automated Criticality Safety Analyses Using Burnup Credit</a></li>

<liclass="toctree-l1"><aclass="reference internal"href="Sourcerer.html">Sourcerer: Deterministic Starting Source for Criticality Calculations</a></li>

<liclass="toctree-l1"><aclass="reference internal"href="BONAMI.html">BONAMI: Resonance Self-Shielding by the Bondarenko Method</a></li>

<liclass="toctree-l1"><aclass="reference internal"href="CENTRM.html">CENTRM: A Neutron Transport Code for Computing Continuous-Energy Spectra in General One-Dimensional Geometries and Two-Dimensional Lattice Cells</a></li>

</ul>

<pclass="caption"><spanclass="caption-text">Monte Carlo Transport</span></p>

<ul>

<liclass="toctree-l1"><aclass="reference internal"href="Monte%20Carlo%20Transport%20Overview.html">Monte Carlo Transport Overview</a></li>

<liclass="toctree-l1"><aclass="reference internal"href="Keno.html">Keno: A Monte Carlo Criticality Program</a></li>

<liclass="toctree-l1"><aclass="reference internal"href="KenoA.html">Keno Appendix A: KENO V.a Shape Descriptions</a></li>

<liclass="toctree-l1"><aclass="reference internal"href="KenoB.html">Keno Appendix B: KENO VI Shape Descriptions</a></li>

<liclass="toctree-l1"><aclass="reference internal"href="Monaco.html">Monaco: A Fixed-Source Monte Carlo Transport Code for Shielding Applications</a></li>

<liclass="toctree-l1"><aclass="reference internal"href="MAVRIC.html">MAVRIC: Monaco with Automated Variance Reduction using Importance Calculations</a></li>

<spanid="csas5"></span><h1>CSAS5: Control Module For Enhanced Criticality Safety Analysis Sequences With KENO V.a<aclass="headerlink"href="#csas5-control-module-for-enhanced-criticality-safety-analysis-sequences-with-keno-v-a"title="Permalink to this headline">¶</a></h1>

<p><em>L. M. Petrie, K. B. Bekar, S. Goluoglu,</em><sup>*</sup><em>D. F. Hollenbach,</em><sup>*</sup><em>N. F. Landers</em></p>

<p>The <strong>C</strong>riticality <strong>S</strong>afety <strong>A</strong>nalysis <strong>S</strong>equences with

KENO V.a (CSAS5) provides reliable and efficient means of performing

<em>k</em><sub>eff</sub> calculations for systems that are routinely encountered in

engineering practice. In the multigroup calculation mode, CSAS5 uses

XSProc to process the cross sections for temperature corrections and

problem-dependent resonance self-shielding and calculates the <em>k</em><sub>eff</sub>

of a three-dimensional (3-D) system model. If the continuous energy

calculation mode is selected no resonance processing is needed and the

continuous energy cross sections are used directly in KENO V.a, with

temperature corrections provided as the cross sections are loaded. The

geometric modeling capabilities available in KENO V.a coupled with the

automated cross-section processing within the control sequences allow

complex, 3-D systems to be easily analyzed. A search capability is

achieved by repeatedly activating the control module MODIFY, to alter

either the system dimensions or densities, and the functional module

KENO V.a to calculate the <em>k</em><sub>eff</sub> for the modified dimensions or

densities.</p>

<p>*Formerly with Oak Ridge National Laboratory.</p>

<divclass="section"id="acknowledgments">

<h2>Acknowledgments<aclass="headerlink"href="#acknowledgments"title="Permalink to this headline">¶</a></h2>

<p>CSAS5 and its related Criticality Safety Analysis Sequences are based on the old CSAS2 control

module (no longer in SCALE) and the KENO V.a functional module described in the KENO V.a chapter.

Therefore, special acknowledgment is made to J. A. Bucholz, R. M. Westfall, and J. R. Knight who developed CSAS2.

G. E. Whitesides is acknowledged for his contributions through early versions of KENO.

Appreciation is expressed to C. V. Parks and S. M. Bowman for their guidance in developing CSAS5.</p>

<p>Special appreciation is expressed to S. J. Poarch and S. Y. Walker for their efforts in formatting this document.</p>

</div>

<divclass="section"id="introduction">

<spanid="csas5-intro"></span><h2>Introduction<aclass="headerlink"href="#introduction"title="Permalink to this headline">¶</a></h2>

<p>Criticality Safety Analysis Sequence with KENO V.a (CSAS5) provides

reliable and efficient means of performing <em>k</em><sub>eff</sub> calculations for

systems that are routinely encountered in engineering practice,

especially in the calculation of <em>k</em><sub>eff</sub> of three-dimensional (3-D)

system models. CSAS5 implements XSProc to process material input and

provide a temperature and resonance-corrected cross-section library

based on the physical characteristics of the problem being analyzed. If

a continuous energy cross-section library is specified, no resonance

processing is needed and the continuous energy cross sections are used

directly in KENO V.a, with temperature corrections provided as the cross

sections are loaded. A search capability is available to find a desired

values of <em>k</em><sub>eff</sub> as a function of dimensions or densities. The two

basic search options offered are (1) an optimum search seeking a maximum

or minimum value of <em>k</em><sub>eff</sub> and (2) a critical search seeking a fixed

value of <em>k</em><sub>eff</sub>.</p>

<p>All the control sequences in the CSAS5 control module are listed in

<aclass="reference internal"href="#tab2-1"><spanclass="std std-numref">Table 4</span></a> with the modules they invoke. The first four sequences are

<caption><spanclass="caption-number">Table 4 </span><spanclass="caption-text">CSAS5 sequences for criticality safety</span><aclass="headerlink"href="#id8"title="Permalink to this table">¶</a></caption>

<caption><spanclass="caption-number">Table 5 </span><spanclass="caption-text">Outline of KENO data</span><aclass="headerlink"href="#id9"title="Permalink to this table">¶</a></caption>