Two separate reports have suggested it could be an ideal site for a new small module reactor (SMR).
About 300 workers are decommissioning the plant which began in 1995, two years after it ceased operating.
It is due to enter a care and maintenance period in 2016. Ninety redundancies were announced in April.
Darryl Williams from the Unite union said: "We would welcome anything that would keep local skills in the area."
A report by the House of Commons Energy and Climate Change Committee has called on the UK government to drive forward the development of SMRs.
Another report by the Institute of Mechanical Engineers also suggested Trawsfynydd as a location for a demonstrator reactor.
If the idea was given the go-ahead, it is thought the reactor could be up and running in 10-15 years.
A Welsh government spokesperson said it was a matter for the UK government, but that it would monitor the situation.
The Department of Environment and Climate Change (DECC) said: "We are undertaking a programme of work looking at the potential of SMRs."

Mohit Dupar, 36, attempted to reach Gustavo Silva Da Cruz, 19, after he got into difficulty at Camber Sands, East Sussex, on 24 July.
Mr Silva Da Cruz died at the scene. Mr Dupar died in hospital four days later.
East Sussex coroner Alan Craze said he would be looking at what public safety measures could be used at the beach.
More news from Sussex
The inquest in Hastings was told Mr Dupar, from Hayes, west London, died from a brain injury caused by cardiac arrest due to drowning.
His 17-year-old son Ankush was also pulled from the sea, and remained in a coma for three weeks.
Mr Silva Da Cruz, a Brazilian national who had been visiting family in Croydon, south London, died from drowning with his asthma possibly an exacerbating factor, the inquest heard.
Robert Cass, of Rother District Council, said he believed the incoming tide meant the men became stranded and unable to get off a sandbar .
Mr Craze adjourned the hearing and said he was considering verdicts of misadventure.
A pre-inquest review into the deaths of five men from London was also held in Hastings.
Kenugen Saththiyanathan, 18, known as Ken, and his brother Kobikanthan Saththiyanathan, 22, known as Kobi, both of Normandy Way, Erith, south-east London, were among the friends who died in the sea at Camber Sands on 24 August.
Nitharsan Ravi, 22, of Admaston Road, Plumstead, south-east London, Inthushan Sriskantharasa, 23, of Chadwell Road, Grays, Essex, and Gurushanth Srithavarajah, 27, of Elsa Road, Welling, south-east London, were also in the group.
A date for a full inquest was not formally fixed, and a decision on whether the inquest would be heard in front of a jury was deferred.
The coroner said he would want to hear expert evidence into what public safety measures would be practical and recommendable, including the possibility of having sections of the beach for swimming only.
"The provision of safety for the vast numbers of people that go to Camber is now an extremely important matter, and I owe it to the community as a whole to investigate as far as I conceivably can do," Mr Craze said.
Union leaders at the Trawsfynydd nuclear power station in Gwynedd have welcomed suggestions a new smaller reactor should be located there.
[NEXT_CONCEPT]
A man died after trying to rescue a day-tripper from the sea a month before five young friends died at the same beach, an inquest has heard.