Update README.md

The MET1000 (or ABR1000) reactor model was developed based on the specifications

of an OECD/NEA benchmark:

> L. Buiron et al. (2019), _Benchmark for Uncertainty Analysis in Modeling (UAM)

> for Design, Operation and Safety Analysis of SFRs, Core definitions, Version 1.6,_

> OECD/NEA.

* L. Buiron et al. (2019), _Benchmark for Uncertainty Analysis in Modeling (UAM)

  for Design, Operation and Safety Analysis of SFRs, Core definitions, Version 1.6,_

  OECD/NEA.

## Model citation

Cite the following references when using this model:

> F. Bostelmann, G. Ilas, C. Celik, A. M. Holcomb, and W. Wieselquist (2021),

> _Nuclear Data Assessment for Advanced Reactors,_

> [NUREG/CR-7289, ORNL/TM-2021/2002](https://www.nrc.gov/reading-rm/doc-collections/nuregs/contract/cr7289/index.html),

> Oak Ridge National Laboratory, Oak Ridge, TN.

>

> F. Bostelmann (2020), _Systematic Sensitivity and Uncertainty Analysis of

> Sodium-Cooled Fast Reactor Systems,_ [PhD thesis](https://infoscience.epfl.ch/record/274286),

> École polytechnique fédérale de Lausanne, Switzerland.

* F. Bostelmann, G. Ilas, C. Celik, A. M. Holcomb, and W. Wieselquist (2021),

  _Nuclear Data Assessment for Advanced Reactors,_

  [NUREG/CR-7289, ORNL/TM-2021/2002](https://www.nrc.gov/reading-rm/doc-collections/nuregs/contract/cr7289/index.html),

  Oak Ridge National Laboratory, Oak Ridge, TN.

* F. Bostelmann (2020), _Systematic Sensitivity and Uncertainty Analysis of

  Sodium-Cooled Fast Reactor Systems,_ [PhD thesis](https://infoscience.epfl.ch/record/274286),

  École polytechnique fédérale de Lausanne, Switzerland.

## Content

Input and output files for MET1000 full core sensitivity and uncertainty

calculations with the TSUNAMI-Shift sequence are provided.

calculations with the TSUNAMI-Shift sequence are provided. Calculation settings:

- SCALE version: 6.3.0

- Neutron transport: Shift

- Sensitivity analysis: TSUNAMI/IFP

- Neutron histories: 50,000 x (9,900 + 100)

- Latent generations: 20

- Group structure for sensitivity tallies: 302 fast group structure

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MET1000