I want to see the specific rules of Fortify Secure Coding Rules (the rules that Fortify uses by default), because I want to write a report about all rules that are used by F
Short of becoming a Software Engineer at HP Fortify, No. The default rules are considered Intellectual Property of HP Fortify and no one outside Engineering has access to them.
What problem are you trying to solve by this report?
As HP/Fortify distributes rule-packs as binary files to protect their intellectual property, you will not be able to see how the individual rules are written.
However, if you're looking to include some information about which rules/rule-packs were used, you can navigate to the project summary screen and see which rule packs were used at the time of the scan. You will also have access to information such as each rule pack's version and additional meta data about each pack.
Being able to provide this level of detail in a meta-report might be sufficient to preempt follow-up questions. Just a thought...