U.S. officials planned to unveil an improved health care insurance website on Sunday they hope will allow the second enrollment period under President Barack Obama's health reform plan to avoid the technical meltdown that plagued its launch last year.

The reconfigured HealthCare.gov insurance marketplace will go live Sunday night before a month-long open enrollment period that begins Nov. 15, during which existing policyholders can change their coverage.

Administration officials said Sunday they will get it right this time, with a website that will make it easier to shop for coverage, and enough computing capacity, call-center help and other resources to handle re-enrollment of all current policyholders.