Stray neutron fields in the containments of PWRs

Multisphere neutron spectral measurements were performed at six pressurized water reactors (PWRs). The measured differential neutron energy spectra and flux were used to determine average energy, quality factor, dose and dose-equivalent rates. The maximum quality factor found was 7. The neutron spectra varied from a highly moderated one, with anti E=1 keV, to a less moderated one, with anti E=0.7 MeV. Simple linear relations were found to calculate the dose and dose-equivalent rates from the total neutron flux. The dose-equivalent rates on the operating floor level are fourteen times and on the middle level five times the total neutron flux. (author)