P80 TRACON controller reported losing separation between two in trail aircraft when the first aircra...

Attributes
ACN	1655633
Time
Date	201906
Local Time Of Day	1801-2400
Place
Locale Reference	PDX.Airport
State Reference	OR
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	Visual Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 8
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Published Material / Policy

Narrative:

While I was working final I was sequencing multiple aircraft to pdx including both base legs and straight in aircraft. While vectoring aircraft Y for the ILS approach I had to vector him around a VFR aircraft in the approach corridor. After vectoring him around that aircraft and vectoring him onto the final approach course his approach speed reduced by at least 50 knots. While this was going on I was vectoring aircraft X for the visual approach to the parallel runway. I turned aircraft X to a 30 degree intercept and while this was happening was when I realized that aircraft Y's final approach speed had reduced dramatically. As aircraft X was turning to final I lost standard separation.I recommend that the portland class charlie extends to the east and west to avoid conflicts from VFR aircraft. I also need to use speed control more appropriately and not give up altitude separation between aircraft that I am sequencing to final.

Original NASA ASRS Text

Title: P80 TRACON Controller reported losing separation between two in trail aircraft when the first aircraft was vectored off the approach to avoid unidentified VFR conflicting traffic.

Narrative: While I was working Final I was sequencing multiple aircraft to PDX including both base legs and straight in aircraft. While vectoring Aircraft Y for the ILS Approach I had to vector him around a VFR aircraft in the approach corridor. After vectoring him around that aircraft and vectoring him onto the final approach course his approach speed reduced by at least 50 knots. While this was going on I was vectoring Aircraft X for the visual approach to the parallel runway. I turned Aircraft X to a 30 degree intercept and while this was happening was when I realized that Aircraft Y's final approach speed had reduced dramatically. As Aircraft X was turning to final I lost standard separation.I recommend that the Portland Class Charlie extends to the east and west to avoid conflicts from VFR aircraft. I also need to use speed control more appropriately and not give up altitude separation between aircraft that I am sequencing to final.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

P80 TRACON controller reported losing separation between two in trail aircraft when the first aircraft was vectored off the approach to avoid unidentified VFR conflicting traffic.