Narrative:

XXX nuclear plant tfr just published. XXX nuclear plant not identified on chart. My conception of location turned out to be in error by a considerable distance leading me to believe I was clear of the tfr to the east. Found out after landing at my destination of my error. Made return flight under ATC control to be sure of not penetrating the tfr again.

Google
 

Original NASA ASRS Text

Title: A GRUMMAN YANKEE PVT PLT ENTERS THE NEWLY ESTABLISHED NO FLY ZONE/TEMPORARY FLT RESTR AREA NEAR A NUCLEAR PWR PLANT AT ZZZ, US.

Narrative: XXX NUCLEAR PLANT TFR JUST PUBLISHED. XXX NUCLEAR PLANT NOT IDENTIFIED ON CHART. MY CONCEPTION OF LOCATION TURNED OUT TO BE IN ERROR BY A CONSIDERABLE DISTANCE LEADING ME TO BELIEVE I WAS CLEAR OF THE TFR TO THE EAST. FOUND OUT AFTER LNDG AT MY DEST OF MY ERROR. MADE RETURN FLT UNDER ATC CTL TO BE SURE OF NOT PENETRATING THE TFR AGAIN.

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.