The prime suspect in the Paris attacks had document about a German nuclear research base hidden in his Brussels flat, according to reports.
Investigators found the papers in the Molenbeek flat of Salah Abdeslam, who was the world's most wanted man until he was arrested last month.
The papers concerned the Juelich base, near the Belgian border, which has atomic waste stored there, according to German media.
The centre said in a statement there was no indication of any danger and that it was in contact with security authorities and nuclear supervisors.
A local news network, the Redaktionsnetzwerk Deutschland (RND) group said sources had told it Hans-Georg Maassen, head of Germany's domestic intelligence agency (BfV), had told a parliamentary committee Abdeslam had the documents.
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The sources also said the committee, which monitors German intelligence agencies, was told printouts of articles from the internet and photos of Juelich chairman Wolfgang Marquardt were found in the apartment in which Abdeslam was arrested on March 18.
Neither the BfV nor the BND foreign intelligence agency were immediately available for comment when contacted by Reuters.
Concerns that Islamist militants are turning their attention to the nuclear industry's weak spots have risen since the Brussels attack.
Workers at the Tihange nuclear power plant were evacuated following the attacks on Brussels on March 22.
A few days later a security guard who worked at the Doel nuclear plant, in the city of Charleroi, which is believed to be an ISIS target, was killed and had his pass stolen.
Abdeslam, who was born and raised in Belgium to Moroccan parents, was captured along with four other suspects in the flat, where he lived while the Paris attacks were being plotted, on March 18.
He was shot after refusing to comply with police orders.
Four days later, suicide bombers killed 32 people in Brussels airport and a rush-hour metro train.
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Abdeslam spent four months on the run after the attacks on the French capital, in which 130 people died and his brother blew himself up outside the Comptoir Voltaire café.
Abdeslam provided logistics support for the sickening act of slaughter, but claims that he could not bring himself to detonate his suicide vest at the Stade de France during a football international between France and Germany.