Shell-on Frozen Prawns and Power Outage I love everything from the sea, but am a little squeamish when it comes to cooking shellfish etc. myself 

I have a large bag of Frozen, shell-on Black Tiger prawns, as well as two trays of 'Jumbo' Black Tiger prawns in my freezer (these are enormous, almost Lobster-like, three per pack). 

My particular issue with these is that while they are well in-date, we have had two x 6 to 8 hour planned power-outages over the time I've had them in the freezer. I followed the usual guideline, as in keep the freezer closed during the outage. 

Should I be concerned, or just cook up these (still beautiful looking) Crustaceans? 

Thanks!

(My first post here, so please forgive any errors.)
Without knowing the internal temperature of your freezer for the duration of the power outages this is impossible to answer.  Since these are planned outages, I assume you have experienced them before.  Do items in your freezer remain frozen?  At the very least, they will have experienced some freeze/thaw cycling, which would likely impact the texture of the prawns.  It is obviously not ideal. So, yes, I would be concerned.  How concerned is impossible to judge with the information provided.