Accuracy　and　computational　expenses　are　contradictory　when　performing　simulation　to　hot　plenum　where　multi-dimensional　phenomena　voice　loudly　in　sodium-cooled　fast　reactor　(SFR).　A　2-dimensional　method　was　preferred　in　light　of　the　cylindrical　shape　and　drive　force　behind　significant　thermal　stratification　phenomena　during　transient　case.　One　barrier　related　to　buoyancy　effect　on　turbulent　flux　transportation　has　been　removed　before.　Asymmetric　arrangement　of　components　in　circumferential　direction　makes　another　difficulty　to　reproduce　actual　flow　field　within　hot　plenum　of　pool-type　SFR.　A　series　of　special　techniques　for　spatial　discretization　were　implemented　to　restore　geometry　reality.　Treatments　about　upper　core　structure,　main　heat　exchanger　and　auxiliary　heat　exchanger　were　evaluated　based　on　criterion　of　predicting　well-mixed　inner　plenum　and　stratification　like　outer　plenum.　Finally,　optimal　model　came　to　an　8-block　partition　scheme　in　which　whole　profiles　of　upper　core　structure　and　auxiliary　heat　exchanger　were　described.　Validation　was　carried　out　through　a　normal　state　experiment　on　a　water　platform　with　reduced-scale　structure.　Agreement　of　relative　temperature　distribution　demonstrated　ability　of　this　model　for　tackling　spatial　layout　in　pool-type　SFR　with　the　2-dimensional　library.　All　real-physics　and　efficient　features　indicate　that　this　2-dimensional　methodology　is　an　excellent　tool　for　engineering　application　when　designing　or　evaluating　a　new　SFR　concept.