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A family of A_{2n}^(2) integrable open spin chains with U_q(C_n) symmetry wasrecently identified in arXiv:1702.01482. We identify here in a similar way afamily of A_{2n-1}^(2) integrable open spin chains with U_q(D_n) symmetry, andtwo families of D_{n+1}^(2) integrable open spin chains with U_q(B_n) symmetry.We discuss the consequences of these symmetries for the degeneracies andmultiplicities of the spectrum. We propose Bethe ansatz solutions for two ofthese models, whose completeness we check numerically for small values of n andchain length N. We find formulas for the Dynkin labels in terms of the numbersof Bethe roots of each type, which are useful for determining the correspondingdegeneracies. In an appendix, we briefly consider D_{n+1}^(2) chains with otherintegrable boundary conditions, which do not have quantum group symmetry.

The integrable quantum group invariant A_{2n-1}^(2) and D_{n+1}^(2) open spin chains