Framework Analysis: Can framework analysis (Ritchie, Spencer & O'Connor) be applied to open-ended survey question responses?
Yes it can. If you need to provide justification on the method that you used it would be helpful I'm sure. However like you say this method is used for interview data.

I'd guess (but obviously don't know for sure) that your survey data might be quite minimal/basic if it features at the end of a more structured questionnaire and although there are similarities with many qualitative data analysis techniques, I'd imagine you'd be looking to organise your open-ended responses into something more manageable, perhaps grouping together responses reflecting a particular view.

The following article may be of help:

Hsieh, H.F., Shannon, S. E.; Three Approaches to Qualitative Content Analysis, Qual Health Res November 2005 vol. 15 no. 9 1277-1288. doi: 10.1177/1049732305276687