This article from 1996 claims that it was $2,000 then, up from $1000. And talks about other limits used at INEL as well. ($10k, $60k)
http://health.phys.iit.edu/extended_archive/9603/msg00315.htmlThis article form Canada, in 1976, said it was $200, and shows their math.
http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/11/570/11570472.pdfNUREG-1530 Reassessment of NRC's Dollar Per Person-Rem Conversion Factor Policy (December 1995)
Talks about the 'old' $1000, and 'new' $2000 (from NUREG/BR-0058, Revision 2, November 1995). And how it got there from the original range in 1974 of $10-$980. And had a lot of good history for anyone interested. The interesting part is the human capital method, versus the 'willingness to pay' method, hehehe (page 18/28)
https://www.nrc.gov/docs/ML0634/ML063470485.pdf Below is a list of Reg guides referenced in the document above, and the values in them at that time. I haven't see what the latest value is in them, but I provide them to get oyu started in the right direction.
Regulatory Guide 1.109 contains guidance on performing dose calculations and the use of $1000 per person-rem for the dollar valuation for radwaste system design alternatives for power reactors. Also, Regulatory Guide 8.37 suggests the use of $1000 per person-rem in determining ALARA levels for radiological effluent from materials facilities. NUREG-0933, 'A Prioritization of Generic Safety Issues" utilizes $1000 per person-rem in assigning priorities and resolving generic safety issues.
Bottom line, you can take the $2000 value, and apply a cost a living increase if you want to get a closer value for today.