Romania signed some treaties of non-proliferation of nuclear weapons and it does not hold any weapons of this kind.
Romania does have nuclear reactors (2 units are in function and they plan to add more to the Cernavoda nuclear plant ).
That plant was built on communist times and finished after and has 1,400 MW of nuclear power capacity which constitutes around 18% of the national power generation capacity of the country. This makes Romania the 23rd largest user of nuclear power in the world. Not bad for a small not so developed country. When all the four reactors are fully functional, the Cernavodă Nuclear Power Plant will produce around 40% of Romania's total electricity needs.
There are also plans for the construction of a second nuclear power plant in Transylvania that will either have 2 reactors of 1,200 MW each or 4 reactors of 600 MW each with an electricity generating capacity of 2,400 MW and will be built after 2020.
The technology used in the functioning one is a Canadian one named CANDU which is better than the Russian's tech.
Romania has also the biggest factory of heavy water in the world. Heavy water is used in the nuclear reactors
Not only covers its needs but also exports the heavy water all over the world (to countries which have nuclear plants).
At some time, the former communist dictator Ceausescu thought about manufacturing nuclear weapons, mainly not for defending from the West but from the East (the Soviets). He wasn't in a good relationship with the Soviets.
But communism fell, so he didn't have time for his plan.
As for if Romania was a peaceful nation since its independence ... yes, it was. Mostly.
In most of Romania's history, the people defended themselves rather than trying to conquer others. We were the first line of defense against Islam in the medieval times.Sometimes, we succeed in defending the Turks which gave the West the breathing room it needed.
In the modern times (after it's independence 1877), Romania didn't wage war against others with some small exceptions.
One war was the Balkans War 1912-1913. Romania didn't take part in it at the beginning (Bulgaria and other two countries started the first war against Ottoman empire), but in the end, it entered in the second war (when Bulgaria, dissatisfied with the outcome of the first war started a second one against the former allies). Entering in the war meant it put an end of it by defeating Bulgaria. See here:
Another one was a short war with Hungary in 1919 right after WWI (where Romania also took part and also fought against Austrian-Hungarian troops).
After WWI, Romania got the province of Transylvania, which was inhabited by Romanians since even when the Romans conquered Dacians (and thus the Romanian people was formed).
But the Hungarian government resigned and a Bolshevik government took power which promised they won't let Transylvania go. As a result, Romanian troops defeated Hungarians and enforced the result of the WWI peace treaty (the troops even occupied the Hungary capital). See here:
After that, Romania took part in the WWII fighting along Germans, then in 1944 switching sides to Allies.
The country became communist, just like other countries which were "freed" by the Soviets. But unlike most of those countries, Romania didn't participate in the Prague Spring attack when Soviets and other communist countries sent troops to put an end to the Czech revolution (which wanted to do reforms). Romania and its soon to be dictator Ceausescu publicly condemned those countries for interfering in Czechoslovakia's internal business.
Being part of NATO means Romania does participate in some of its actions, like Iraq and Afghanistan wars and sent some troops there (the troops weren't actively engaged in the fighting).
Overall, Romania is a peaceful nation and has no interest in going to war by itself against neighbors or against other nations. But, like I said, being in NATO has some obligations to fulfill.
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