초록

A double lid arrangement, suitable for use in sealing irradiated fuel transport flasks, has inner and outer lids held together by securing members. If the securing members fail, the inner and outer lids operate individually, ensuring that the flask remains sealed.

대표청구항 ▼

A container comprising, in combination: (A) a vessel having an opening; and (B) a lid assembly to be secured in said opening to seal said opening, said lid assembly including (i) a deformable inner lid member, (ii) an outer lid member, (iii) means for securing said inner and outer lid members togeth

A container comprising, in combination: (A) a vessel having an opening; and (B) a lid assembly to be secured in said opening to seal said opening, said lid assembly including (i) a deformable inner lid member, (ii) an outer lid member, (iii) means for securing said inner and outer lid members together to form a single unit which is to be inserted, inner lid member first, into said opening, (iv) means for attaching said inner lid member to said vessel so that, in use, said inner lid member seals said opening, (v) stop means associated with said outer lid member, (vi) said securing means being operative for releasing said outer lid member from said inner lid member on the occurrence of a fault condition which results in deformation of said inner lid member, thereby allowing said outer lid member to move relative to said vessel, and (vii) said stop means then being operative for restricting the extent of movement of said outer lid member relative to said vessel so as to limit the degree of deformation of said inner lid member and prevent leakage of the seal.