use [value]="1" instead of value="1"
<input name="options" ng-control="options" type="radio" [value]="1" [(ngModel)]="model.options" ><br/>
<input name="options" ng-control="options" type="radio" [value]="2" [(ngModel)]="model.options" ><br/>
Edit:
As suggested by thllbrg "For angular 2.1+ use [(ngModel)]
instead of [(ng-model)]
"