Burnable poison designs for a soluble-boron-free civil nuclear marine PWR core

Syed Bahauddin Alam, Benjamin A. Lindley, Geoffrey T. Parks, Eugene Shwageraus

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

9 Scopus citations

Abstract

In an effort to de-carbonise commercial freight shipping, there is growing interest in the possibility of using nuclear propulsion systems. Nuclear-powered propulsion allows ships to operate with low fuel costs, long intervals between refueling, and minimal emissions; however, currently these systems remain largely confined to military vessels. It is highly desirable that a civil marine core not use soluble boron for reactivity control, but it is then a challenge to achieve an adequate shutdown margin throughout the core life while maintaining reactivity control and acceptable power distributions in the core. We have considered several potential and novel burnable poison (BP) design strategies for reactivity control in this study: (Case 1) a composite BP: gadolinia (Gd2O3) or erbia (Er2O3) with 150 μm thickness ZrB2 integral fuel burnable absorber (IFBA); (Case 2) Pu-240 or Am-241 mixed homogeneously with the fuel; and (Case 3) another composite BP: Pu-240 or Am-241 with 150 μm thickness ZrB2 IFBA. The results are compared against those for a high-thickness 150 μm 25 IFBA pins1 design from a previous study. We arrive at a design using 15% U-235 fuel loaded into 13 × 13 assemblies with Case 3 BPs for reactivity control. Taking advantage of self-shielding effects, this design maintains low and stable assembly reactivity with minimal burnup penalty. Case 3 provides ∼10% more initial reactivity suppression with ∼70% less reactivity swing compared to the IFBA-only design for UO2 fuel while achieving almost the same cycle length. Finally, optimized Case 3 assemblies were loaded into a 3D reactor model in PANTHER. The PANTHER results show that the designed core can achieve the target lifetime of 15 years while minimizing the reactivity swing to a greater extent and providing a ∼30% lower radial form factor and ∼28% lower total peaking factor compared to the IFBA-only core.

Original languageEnglish
Title of host publicationPhysics of Reactors 2016, PHYSOR 2016
Subtitle of host publicationUnifying Theory and Experiments in the 21st Century
PublisherAmerican Nuclear Society
Pages1926-1938
Number of pages13
ISBN (Electronic)9781510825734
StatePublished - 1 Jan 2016
Externally publishedYes
EventPhysics of Reactors 2016: Unifying Theory and Experiments in the 21st Century, PHYSOR 2016 - Sun Valley, United States
Duration: 1 May 20165 May 2016

Publication series

NamePhysics of Reactors 2016, PHYSOR 2016: Unifying Theory and Experiments in the 21st Century
Volume3

Conference

ConferencePhysics of Reactors 2016: Unifying Theory and Experiments in the 21st Century, PHYSOR 2016
Country/TerritoryUnited States
CitySun Valley
Period1/05/165/05/16

Keywords

  • Burnable poison (BP)
  • Civil marine propulsion
  • Composite BP
  • Soluble-boron-free (SBF) design

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