An inquiry team investigating concerns that tissue samples could have been removed from 65 deceased nuclear workers has visited Dounreay.
Dounreay's operators are assisting the inquiry team
Operators of the plant in Caithness previously revealed that post mortem examination samples of two employees were sent to its headquarters.
Members of the independent Redfern Inquiry were at Dounreay on Wednesday.
It was one in a series of visits they have been making to nuclear sites across the UK.
The inquiry was sparked by claims that samples were taken from former Sellafield employees who died in the 1960s.
There have been concerns expressed that proper consent was not sought from relatives.
The UK Atomic Energy Authority (UKAEA) confirmed earlier this year that samples from two employees who worked at the Caithness plant between 1962 and 1991 were sent to its headquarters in Harwell.
Dounreay said for relatives and other interested parties can get in touch with the inquiry by writing to the Redfern Inquiry, 7th Floor, 1 Byrom Place, Manchester, M3 3HG; emailing firstname.lastname@example.org ; faxing 0161 837 1569 or calling 0161 837 1554.