Capitol Hill Happenings: Today in Congress

The White House's nuclear power experts, Energy Secretary Steven Chu and Nuclear Regulatory Commission Chairman Gregory Jaczko, brief members of the Senate Environment and Public Works Committee on the ongoing crisis at the Fukushima Daiichi nuclear power facility in Japan. Several of the plant's reactors were damaged after a large earthquake and tsunami on Friday.

In other earthquake news, Navy Secretary Ray Mabus and Chief of Naval Operations Adm. Gary Roughead should give an update on their department's efforts to assist in recovery operations in Japan during a 10:30 a.m. ET hearing on their proposed 2012 budget.

The Senate Finance Committee holds a hearing at 10:00 a.m. ET on the health care overhaul law passed during the last Congress with Health and Human Services Secretary Kathleen Sebelius. They'll discuss the lessons learned during the first year of implementation. In the afternoon, Republicans on the committee plan a press conference to discuss what they consider to be "fundamental flaws" of President Obama's signature legislative accomplishment.

Democrats in the House and Senate plan to rally the base with a pair of events to introduce legislation to repeal the Defense of Marriage Act (DOMA). The act, passed in 1996 under President Clinton defines marriage as a legal union between a man and a woman. President Obama recently asked the Department of Justice to stop defending DOMA in court because he believes it is unconstitutional. Speaker John Boehner, R-Ohio, has announced that the House would retain outside counsel to defend the law in court if necessary.

We'll be following all these stories and more, so stay with Fox News for all the latest.