adding files that I modified

Author: Khaldoon Ali Mohammad Al Dawood

doc/content/bib/vtb.bib

@@ -2547,3 +2547,81 @@ @article{jaradat2024verification
   publisher={Taylor \& Francis}
 }
 
+@article{zhang2016shandong,
+  title={The Shandong Shidao Bay 200 MWe high-temperature gas-cooled reactor pebble-bed module (HTR-PM) demonstration power plant: an engineering and technological innovation},
+  author={Zhang, Zuoyi and Dong, Yujie and Li, Fu and Zhang, Zhengming and Wang, Haitao and Huang, Xiaojin and Li, Hong and Liu, Bing and Wu, Xinxin and Wang, Hong and others},
+  journal={Engineering},
+  volume={2},
+  number={1},
+  pages={112--118},
+  year={2016},
+  publisher={Elsevier}
+}
+
+@article{reitsma2013pbmr,
+  title={PBMR Coupled Neutronics/Thermal-hydraulics Transient Benchmark. The PBMR-400 Core Design-Volume 1 The Benchmark Definition},
+  author={Reitsma, Frederik and Ivanov, Kostadin and Sartori, Enrico and Lee, Hyun Chul and Daavittila, Antti and Leppanen, Jaakko and Girardi, Enrico and Grimod, Maurice and Koeberl, Oliver and Massara, Simone and others},
+  year={2013},
+  journal={}
+}
+
+
+@article{hebert2009development,
+  title={Development of the subgroup projection method for resonance self-shielding calculations},
+  author={H{\'e}bert, Alain},
+  journal={Nuclear science and engineering},
+  volume={162},
+  number={1},
+  pages={56--75},
+  year={2009},
+  publisher={Taylor \& Francis}
+}
+
+
+@techreport{schunert2020nrc,
+  title={NRC Multiphysics Analysis Capability Deployment (FY2021--Part 1)},
+  author={Schunert, Sebastian and Giudicelli, Guillaume Louis and Balestra, Paolo and Ortensi, Javier and Freile, Ramiro and Harbour, Logan},
+  year={2020},
+  institution={Idaho National Lab.(INL), Idaho Falls, ID (United States)}
+}
+
+@techreport{jaradat2023gas,
+  title={Gas-cooled high-temperature pebble-bed reactor reference plant model},
+  author={Jaradat, Mustafa Kamel Mohammad and Schunert, Sebastian and Ortensi, Javier},
+  year={2023},
+  institution={Idaho National Laboratory (INL), Idaho Falls, ID (United States)}
+}
+
+
+@techreport{schunert2022improvements,
+  title={Improvements in High Temperature Gas Cooled Reactor Modeling Capabilities in the Pronghorn Code},
+  author={Schunert, Sebastian and Mohammad Jaradat, Mustafa Kamel and Calvin, Olin W and Giudicelli, Guillaume Louis and Lindsay, Alexander D and Wang, Yaqi and Tano Retamales, Mauricio Eduardo and Walker, Samuel Austin},
+  year={2022},
+  institution={Idaho National Laboratory (INL), Idaho Falls, ID (United States)}
+}
+
+
+@techreport{schunert2021deployment,
+  title={Deployment of the Finite Volume Method in Pronghorn for Gas and Salt cooled Pebble Bed Reactors},
+  author={Schunert, Sebastian and Giudicelli, Guillaume Louis and Lindsay, Alexander D and Balestra, Paolo and Harper, Sterling and Freile, Ramiro and Tano, Mauricio and Ragusa, Jean},
+  year={2021},
+  institution={Idaho National Laboratory (INL), Idaho Falls, ID (United States)}
+}
+
+
+@article{zheng2018study,
+  title={Study on the DLOFC and PLOFC accidents of the 200 MWe pebble-bed modular high temperature gas-cooled reactor with TINTE and SPECTRA codes},
+  author={Zheng, Yanhua and Stempniewicz, Marek M and Chen, Zhipeng and Shi, Lei},
+  journal={Annals of Nuclear Energy},
+  volume={120},
+  pages={763--777},
+  year={2018},
+  publisher={Elsevier}
+}
+
+@article{strydom2008tinte,
+  title={TINTE transient results for the OECD 400 MW PBMR benchmark},
+  author={Strydom, Gerhard},
+  journal={Proceedings of ICAPP ‘08, Anaheim, USA},
+  year={2008}
+}

doc/content/htgr/index.md

@@ -28,7 +28,9 @@
 
 [Pronghorn Generic Pebble Bed HTGR Tutorial](generic-pbr-tutorial/index.md)
 
-[SAM HTR-PM model](htr-pm/index.md)
+[SAM HTR-PM model](htr-pm/sam-model/index.md)
+
+[HTR-PM multiphysics](htr-pm/core-multiphysics/index.md)
 
 [3D-MHTGR mesh](3D_MHTGR/index.md)
 

doc/content/media/htrpm_coremultiphysics/apps_setup_3.png

@@ -67,6 +67,8 @@ obtained through INL's [NCRC](https://inl.gov/ncrc/).
 
 - Molten Salt Reactor Experiment RZ multiphysics core model [documentation](msr/msre/multiphysics_rz_model/index.md) and [inputs](https://github.com/idaholab/virtual_test_bed/tree/main/msr/msre/multiphysics_core_model/steady_state)
 
+- HTR-PM multiphysics model [documentation](htgr/htr-pm/core-multiphysics/index.md) and [inputs](https://github.com/idaholab/virtual_test_bed/tree/main/htgr/htr-pm/core-multiphysics)
+
 
 ### Cardinal / OpenMC (open-source)
 
@@ -128,8 +130,7 @@ obtained through INL's [NCRC](https://inl.gov/ncrc/).
 
 - Generic Pebble Bed Reactor core model [documentation](htgr/generic-pbr/index.md) and [inputs](https://github.com/idaholab/virtual_test_bed/tree/main/htgr/generic-pbr)
 
-- HTR-PM reference plant model [documentation](htgr/htr-pm/index.md) and [inputs](https://github.com/idaholab/virtual_test_bed/tree/main/htgr/htr-pm)
-
+- HTR-PM reference plant model [documentation](htgr/htr-pm/sam-model/index.md) and [inputs](https://github.com/idaholab/virtual_test_bed/tree/main/htgr/htr-pm/sam-model)
 
 ### Thermal-hydraulics module (open-source)
 

doc/content/media/htrpm_coremultiphysics/dragon-models.png

@@ -84,7 +84,7 @@ the input file, but generally reside in the same folder in the repository.
 
 - Thermochimica Steady-State Model of Molten Salt Fast Reactor Core [documentation](msr/msfr/thermo_model) and [inputs](https://github.com/idaholab/virtual_test_bed/tree/devel/msr/msfr/thermochemistry)
 
-- HTR-PM reference plant model [documentation](htgr/htr-pm/index.md) and [inputs](https://github.com/idaholab/virtual_test_bed/tree/main/htgr/htr-pm)
+- HTR-PM reference plant model [documentation](htgr/htr-pm/sam-model/index.md) and [inputs](https://github.com/idaholab/virtual_test_bed/tree/main/htgr/htr-pm/sam-htrpm)
 
 ### Multiphysics and multiscale simulations
 
@@ -94,6 +94,7 @@ the input file, but generally reside in the same folder in the repository.
 
 - HTTR Core multiphysics [documentation](httr/index.md) and [inputs](https://github.com/idaholab/virtual_test_bed/tree/main/htgr/httr/steady_state_and_null_transient)
 
+- HTR-PM multiphysics [documentation](htgr/htr-pm/core-multiphysics/index.md) and [inputs](https://github.com/idaholab/virtual_test_bed/tree/main/htgr/htr-pm/core-multiphysics)
 
 ## Restarting from a previous simulation
 
@@ -114,7 +115,7 @@ Documentation for the [Checkpoint system](https://mooseframework.inl.gov/applica
 
 - HTTR Core multiphysics [documentation](httr/index.md) and [inputs](https://github.com/idaholab/virtual_test_bed/tree/main/htgr/httr/steady_state_and_null_transient)
 
-- HTR-PM reference plant model [documentation](htgr/htr-pm/index.md) and [inputs](https://github.com/idaholab/virtual_test_bed/tree/main/htgr/htr-pm)
+- HTR-PM reference plant model [documentation](htgr/htr-pm/sam-model/index.md) and [inputs](https://github.com/idaholab/virtual_test_bed/tree/main/htgr/htr-pm/sam-htrpm)
 
 
 ### Binary restart
@@ -188,7 +189,7 @@ specified. The MRAD and PBMR-400 models listed below are an example of this.
 
 - Thermochimica Steady-State Model of Molten Salt Fast Reactor Core [documentation](msr/msfr/thermo_model) and [inputs](https://github.com/idaholab/virtual_test_bed/tree/devel/msr/msfr/thermochemistry)
 
-- HTR-PM reference plant model [documentation](htgr/htr-pm/index.md) and [inputs](https://github.com/idaholab/virtual_test_bed/tree/main/htgr/htr-pm)
+- HTR-PM reference plant model [documentation](htgr/htr-pm/sam-model/index.md) and [inputs](https://github.com/idaholab/virtual_test_bed/tree/main/htgr/htr-pm/sam-htrpm)
 
 ### HPC required