Development　of　nuclear　energy　and　hydrogen　energy　both　as　renewable　energy　open　up　a　vast　range　of　prospects.　The　scheme　for　hydrogen　generation　station　in　nuclear　power　plant　has　been　carried　out　in　china.　However,　Nuclear　Energy　is　expected　to　encourage　a　safety　culture　that　prevents　serious　accidents　while　dispersion　of　hydrogen　from　a　container　produces　a　risk　of　combustion.　The　dispersion　and　behavior　of　hydrogen　production　plant　attached　with　nuclear　power　plant　are　still　poorly　understood.　In　this　paper,　a　dispersion　of　hydrogen　model　is　established　and　is　calculated　under　two　typical　condition　with　corrected　ideal　gas　state　equation.　The　flammability　of　hydrogen　after　dispersion　is　studied.　The　range　of　flammability　of　dispersion　of　hydrogen　production　plant　with　different　pressures,　positions　and　temperatures　is　obtained.　This　work　could　contribute　to　the　marginal　hydrogen　safety　design　for　hydrogen　production　station　and　lay　the　foundation　for　the　establishment　of　a　safe　distance　standard　that　it＇s　necessary　to　prevent　hydrogen　explosion.　(C)　2020　Hydrogen　Energy　Publications　LLC.　Published　by　Elsevier　Ltd.　All　rights　reserved.