As reported by the L.A. Times, in an article entitled "Failing Dam Triggers Evacuations":
The National Weather Service said the Guajataca Dam was failing Friday afternoon.
“All Areas surrounding the Guajataca River should evacuate NOW,” the weather service said on social media. “Their lives are in DANGER! Please SHARE!”
As the map in the article shows, the failing dam is in the same quadrant of Puerto Rico as the research reactor.
(The Washington Post has also reported on this story.)
Learn more about the Guajataca Lake (with info. about the dam), and the Guajataca River downstream, at the links provided to Wikipedia entries.
This crisis brings to mind the Fukushima waiting to happen in South Carolina, as revealed by NRC whistle-blowers. The three reactor Oconee nuclear power plant is immediately downstream of a major dam. If the dam fails, those three reactors would be under more than 15 feet deep water, a similar depth that doomed Fukushima Daiichi, Japan when the tsunami struck.
Ironicially enough, Hurricane Maria is predicted to travel north, up the eastern seaboard of the U.S. It is too early to tell where it might score a direct hit -- but Oconee is an example of an already high-risk situation, that does not need a major hurricane added on top!
Similarly, the risk of dam breaks threatened "Port" Calhoun, Nebraska in the summer of 2011. The Fort Calhoun atomic reactor had already suffered historic flooding on the Missouri River, that came precariously close to plunging the reactor into a dangerous situation. But had one of several upstream dams failed (and one was under particular strain), it could have doomed Fort Calhoun to radioactive catastrophe downstream. The operators had the sense to shut the reactor in April of 2011, which gave the reactor some months of cold shutdown to stabilize. But nonetheless, the high-level radioactive waste storage pool, as well as irradiated nuclear fuel dry casks, remained at risk of such an "inland tsunami," as Fairewinds Energy Education's Chief Engineer, Arnie Gundersen, dubbed it at the time. However, the Cooper atomic reactor -- a Fukushima twin design -- a bit further downstream the Missouri than Fort Calhoun, took the unwise risk of continuing to operate throughout the historic floods, at 100% power levels.
Another dam/nuclear power plant combination of concern is at North Anna, VA. As with many dams across the U.S., its structural integrity gets low to failing grades. It holds back the water of North Anna, an artificial lake that serves as North Anna's twin reactors' "ultimate heat sink" for keeping the reactors cool. In addition to such threats as deluges, the earthern dam at North Anna is also at risk of earthquakes. In August 2011, a strong earthquake epicentered just 11 miles from North Anna tested the earthen dam. The North Anna site itself is crossed by earthquake faultlines, something not only the nuclear utility itself, but also the U.S. Atomic Energy Commission staff, knew during construction in the 1970s, but kept secret.
Most recently, during Hurricane Harvey in Texas, there was great concern about the structural integrity of South Texas Project nuclear power plant's ultimate heat sink as well -- a cooling lake, and the retaining wall holding it -- for fear of overtopping, or breach, due to the historic rainfall deluge.