Narrative:

Called ZZZ flight service for briefing. Asked for NOTAMS in effect that would affect a flight between ZZZ and ZZZ1 with a flight path that would keep me west of class B 30 NM ring. Briefer told me of NOTAM at ZZZ2 having to do with the ZZZ3 power plant. Briefer told me in detail how to draw the restr area for the ZZZ4 landmark. Briefer said nothing about the location of any other power plants along my flight path. When asked about any further power plants the briefer listed all power plants in the state. During the flight I passed over 2 power plants. One at ZZZ5 and one at ZZZ6. I was not aware of the locations of these power plants. I took the word of the briefer and didn't get my information directly from the NOTAM itself.

Google
 

Original NASA ASRS Text

Title: A C337 PLT VIOLATED A TFR INVOLVING A PWR PLANT.

Narrative: CALLED ZZZ FLT SVC FOR BRIEFING. ASKED FOR NOTAMS IN EFFECT THAT WOULD AFFECT A FLT BETWEEN ZZZ AND ZZZ1 WITH A FLT PATH THAT WOULD KEEP ME W OF CLASS B 30 NM RING. BRIEFER TOLD ME OF NOTAM AT ZZZ2 HAVING TO DO WITH THE ZZZ3 PWR PLANT. BRIEFER TOLD ME IN DETAIL HOW TO DRAW THE RESTR AREA FOR THE ZZZ4 LANDMARK. BRIEFER SAID NOTHING ABOUT THE LOCATION OF ANY OTHER PWR PLANTS ALONG MY FLT PATH. WHEN ASKED ABOUT ANY FURTHER PWR PLANTS THE BRIEFER LISTED ALL PWR PLANTS IN THE STATE. DURING THE FLT I PASSED OVER 2 PWR PLANTS. ONE AT ZZZ5 AND ONE AT ZZZ6. I WAS NOT AWARE OF THE LOCATIONS OF THESE PWR PLANTS. I TOOK THE WORD OF THE BRIEFER AND DIDN'T GET MY INFO DIRECTLY FROM THE NOTAM ITSELF.

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.