D10 Controller described a loss of separation event when a 'Wake Remnant' standard was referenced by evaluations personnel; the reporter indicating no 'Wake Remnant' standard is currently listed in FAA Operational Orders.

Narrative

Air Carrier Y was following Air Carrier X on downwind to DFW Runway 17C. When Air Carrier Y was 6.32 miles behind; Air Carrier X was turned base. Air Carrier X slowed on base; but at that point Air Carrier Y was no longer behind him; nor was Air Carrier Y turned on the same path behind the heavy. However; because Air Carrier X's ground speed slowed on base; Air Carrier Y was 4.59 miles away when reaching the point that Air Carrier X turned. This was ruled a loss of wake turbulence separation because Air Carrier Y was not 5 miles behind the WAKE REMNANT of Air Carrier X. I do not agree with this ruling; as the heavy was turned out of the path of Air Carrier Y at 6.32 miles. Recommendation; 1. TARP (Traffic Analysis and Review Program) is used as tool used to find ATC errors. ATC needs a complimentary tool to assist in preventing errors that TARP will catch. 2. This is another arbitrary ruling from AOV (Air Traffic Safety Oversight Service) and/or ATO (Air Traffic Organization) safety that has little or no foundation in FAA 7110.65. 3. As a long time CPC (Certified Professional Controller) at D10; it seems that for the last few years; we have been held to a different; stricter; although not clearly defined standard than similar facilities in the system.