Some time ago, I also did some searching on the Alexander Kielland disaster (I assume you know "Keilland" as you spell it is not correct). I did not find a lot, and certainly not the official report. I assume the report is written in Norwegian language.
However, maybe following references are useful:
H. Petroski, "When Technology Fails", Gale Research Inc. 1994, pp 301-305.
"Weld Fractures Capsized Hotel Rig", Engineering News-Record, 1981, pp51.