One　of　the　important　factors　which　control　the　service　life　of　SG　plate　would　be　the　generatlon　of　cracks．The　finite element　method　is　applied　to　a　transient　thermal　state　in　order　to　investigate　the　relationship　between　the　SG　plate　confinement　conditions　and　the　thermal　stress　profiles．The　analysis　is　conducted　with　both　the　ends　of　the　SG　plate　being　confined　and　with　the　tapered　positions　being　confined．Under　each　condition，the　tensile　stresses，compressive　stresses，shearing　stresses　and　the　displacements　over　the　plate　are　calculated．The　analysis　shows　that　the　numerlcal　estimate　for　crack　formation　coincide　well　with　the　real　crack　profiles．The　numerical　prediction　for　the　tapered　positions cofinement　is　more　satisfactory　than　that　of　the　ends-confinement，

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