Gov. Jerry Brown’s administration is using federal security regulations written to thwart terrorism to deny public access to records that experts say could guide repairs to the Oroville Dam and provide insight into what led to the near catastrophic failure of its emergency spillway. The administration also is blocking public review of records that would show how Brown’s office handled the February crisis at Oroville Dam that led to the two-day evacuation of nearly 200,000 Northern Californians. Days after the evacuation orders were lifted in February, The Sacramento Bee filed requests to the state under the California Public Records Act.