# Three-Dimensional Full Core Power Calculations for Pressurized Water Reactors

## Abstract

We have implemented a new multilevel parallel decomposition in the Denovo discrete ordinates radiation transport code. In concert with Krylov subspace iterative solvers, the multilevel decomposition allows concurrency over energy in addition to space-angle. The original space-angle partitioning in Denovo placed an eective limit on the scalability of the transport solver that was highly dependent on the problem size. The added phase-space concurrency combined with the high-performance Krylov solvers has enabled weak scaling to 100K cores on the Jaguar XT5 supercomputer. Furthermore, the multilevel decomposition provides enough concurrency to scale to exascale computing and beyond.

- Authors:

- ORNL

- Publication Date:

- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

- Sponsoring Org.:
- USDOE

- OSTI Identifier:
- 1026719

- DOE Contract Number:
- DE-AC05-00OR22725

- Resource Type:
- Conference

- Resource Relation:
- Conference: SciDAC 2010, Chattanooga, TN, USA, 20100711, 20100715

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; DISCRETE ORDINATE METHOD; PHASE SPACE; PWR TYPE REACTORS; RADIATION TRANSPORT

### Citation Formats

```
Evans, Thomas M, Davidson, Gregory G, and Slaybaugh, Rachel N.
```*Three-Dimensional Full Core Power Calculations for Pressurized Water Reactors*. United States: N. p., 2010.
Web.

```
Evans, Thomas M, Davidson, Gregory G, & Slaybaugh, Rachel N.
```*Three-Dimensional Full Core Power Calculations for Pressurized Water Reactors*. United States.

```
Evans, Thomas M, Davidson, Gregory G, and Slaybaugh, Rachel N. Fri .
"Three-Dimensional Full Core Power Calculations for Pressurized Water Reactors". United States.
```

```
@article{osti_1026719,
```

title = {Three-Dimensional Full Core Power Calculations for Pressurized Water Reactors},

author = {Evans, Thomas M and Davidson, Gregory G and Slaybaugh, Rachel N},

abstractNote = {We have implemented a new multilevel parallel decomposition in the Denovo discrete ordinates radiation transport code. In concert with Krylov subspace iterative solvers, the multilevel decomposition allows concurrency over energy in addition to space-angle. The original space-angle partitioning in Denovo placed an eective limit on the scalability of the transport solver that was highly dependent on the problem size. The added phase-space concurrency combined with the high-performance Krylov solvers has enabled weak scaling to 100K cores on the Jaguar XT5 supercomputer. Furthermore, the multilevel decomposition provides enough concurrency to scale to exascale computing and beyond.},

doi = {},

journal = {},

number = ,

volume = ,

place = {United States},

year = {2010},

month = {1}

}

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