Mainly in insurance companies.

sinistro = casualty, accident.

Bruce Minty - LinkedIn
Branch Manager, Senior Account Executive, V.P. at Sedgwick Limited, Ottawa Branch; Property/Casualty Superintendent at Guardian Insurance Company of Canada, ...
www.linkedin.com/pub/bruce-minty/6/645/14

656 F.2d 457
This interpretation of the agreement is confirmed by Mr. Ralphe Merrill, a casualty superintendent for USF&G. He testified that it would take a specific ...
bulk.resource.org/courts.gov/c/F2/656/656.F2d.457.79-4796.html

Sinistro = claim

--------------------------------------------------
Note added at 1 hr (2009-06-11 00:30:57 GMT)
--------------------------------------------------

http://www.jobsite.co.uk/cgi-bin/vacdetails.pl?selection=932...

When I am not certain about which expression to use, when more than one is adequate, I use google to "test" them. Like, google "claims superintendent" (quotes included!!!!) and you'll get 1790 hits. Google "casualty superindent", it brings 240. This is a dangerous "gauge" but I find it useful if you know what you are doing (like "claims superintendent" also have another meaning when "claim" is a verb).

--------------------------------------------------
Note added at 1 hr (2009-06-11 00:32:23 GMT)
--------------------------------------------------

Sorry, read superintendent above where you see superindent.

--------------------------------------------------
Note added at 1 hr (2009-06-11 00:34:24 GMT)
--------------------------------------------------

Oh, by the way, actually sinistro is not "claim", in English, but a "sinistro" leads to a claim that's why the title uses claim.