Improvement of Core Performance by Introduction of Moderators in a Blanket Region of Fast Reactors

<table class="table-group" id="tab8"><tr><td><table class="table"><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td align="left">Ratio of deuteron in moderator pin</td><td align="center">Reactivity (<svg height="15.8625" id="M8" style="vertical-align:-3.56265pt" version="1.1" viewbox="0 0 35.862499 15.8625" width="35.862499" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.363)"><path d="M594 629l-404 -661l-31 23l402 661zM194 635q70 0 107 -56t37 -125t-37.5 -125.5t-107.5 -56.5t-107 56.5t-37 124.5q0 70 37.5 126t107.5 56zM193 605q-28 0 -45 -29t-21.5 -59.5t-4.5 -62.5t4.5 -63t22 -60t45.5 -29q22 0 37.5 16t22 42t9 48t2.5 45q0 152 -72 152z
M567 351q69 0 106 -56t37 -125t-37 -125.5t-107 -56.5t-107.5 56.5t-37.5 124.5q0 43 14.5 83t49 69.5t82.5 29.5zM566 322q-28 0 -45 -28.5t-22 -59.5t-5 -64q0 -23 3 -46t10.5 -48.5t23 -41.5t36.5 -16q28 0 45 29.5t21 59.5t4 62q0 24 -2.5 46.5t-9.5 48.5t-22 42t-37 16
z" id="x25"></path></g><g transform="matrix(.017,-0,0,-.017,15.735,11.363)"><path d="M600 0h-557v24l268 633l28 8l261 -641v-24zM497 50l-194 489l-196 -489h390z" id="x394"></path></g><g transform="matrix(.017,-0,0,-.017,26.632,11.363)"><path d="M516 277q0 -126 -140 -231q-36 -27 -75.5 -42.5t-63.5 -15.5q-38 0 -73 43q-10 -44 -18 -106q-18 -134 -32 -151q-12 -16 -40 -25t-46 -10l-5 14q22 38 84 406q16 92 44.5 146.5t88.5 95.5q68 47 136 47q63 0 101.5 -47.5t38.5 -123.5zM432 259q0 61 -27 101t-79 40
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</svg>)</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td align="left">1.0</td><td align="center">—</td></tr><tr><td align="left">0.9</td><td align="center">0.029</td></tr><tr><td align="left">0.7</td><td align="center">0.103</td></tr><tr><td align="left">0</td><td align="center">0.255</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Reactivity insertion occurred at dissolution of deuteron.

Science and Technology of Nuclear Installations

tab8

Table 8

Table 8: Improvement of Core Performance by Introduction of Moderators in a Blanket Region of Fast Reactors 