ZKC controller misjudges separation between 2 air carrier's.

Attributes
ACN	535892
Time
Date	200201
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : sln.vortac
State Reference	KS
Altitude	msl single value : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc.artcc tracon : a80.tracon
Operator	common carrier : air carrier
Make Model Name	A319
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zkc.artcc
Operator	common carrier : air carrier
Make Model Name	A319
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar pilot : multi engine pilot : instrument pilot : commercial pilot : cfi
Experience	controller radar : 38 controller supervisory : 3 flight time total : 5000
ASRS Report	535892
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	faa : investigated
Miss Distance	horizontal : 18400 vertical : 600
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X checked on to my sector frequency at FL330 and shortly afterwards requested a climb to FL370. Upon air carrier X entering my airspace, I issued air carrier X a climb to FL350. I was aware that air carrier Y was going to turn left at sln and I felt I would have the separation I needed between these 2 aircraft. Air carrier Y turned wbound at sln a little quicker than I anticipated creating a conflict with air carrier X. At that time I issued turns to both aircraft.

Original NASA ASRS Text

Title: ZKC CTLR MISJUDGES SEPARATION BTWN 2 ACR'S.

Narrative: ACR X CHKED ON TO MY SECTOR FREQ AT FL330 AND SHORTLY AFTERWARDS REQUESTED A CLB TO FL370. UPON ACR X ENTERING MY AIRSPACE, I ISSUED ACR X A CLB TO FL350. I WAS AWARE THAT ACR Y WAS GOING TO TURN L AT SLN AND I FELT I WOULD HAVE THE SEPARATION I NEEDED BTWN THESE 2 ACFT. ACR Y TURNED WBOUND AT SLN A LITTLE QUICKER THAN I ANTICIPATED CREATING A CONFLICT WITH ACR X. AT THAT TIME I ISSUED TURNS TO BOTH ACFT.

Data retrieved from NASA's ASRS site as of July 2007 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.