  We have used the unique low frequency sensitivity of the Large Phased Array
radio telescope of Pushchino Radio Astronomy Observatory to collect dataset of
the single pulse observations of second period pulsars of the Northern
hemisphere. During observational sessions of 2011 - 2017 yrs. We have collected
data on 71 pulsars at 111 MHz frequency using digital pulsar receiver. We have
discovered Giant Radio Pulses (GRP) from pulsars B0301+09 and B1237+25, and
confirmed early reported generation of anomalously strong (probable giant)
pulses from B1133+16 on statistically significant dataset. Data for these
pulsars and from B0950+08, B1112+50, early reported as pulsars generating GRPs
were analyzed to evaluate their behavior on long time intervals. It was found
that statistical criterion (power-law spectrum of GRPs distribution on energy
and peak flux density) seems not to be strict for pulsars with the low magnetic
field on light cylinder. Moreover, spectra of some of these pulsars demonstrate
unstable behavior with the time and have complex multicomponent shape. In the
dataset of B0950+08 we have detected strongest GRP from pulsars with the low
magnetic field on light cylinder ever reported having the peak flux density as
strong as 16.8 kJy.
