annual maintenance of seismic instruments installed at dam site of bhep chanderkote , non-comprehensive annual maintenace contract for siesmic instruments including strong motion accelerograph , seismograph recorder & sensor installed at the dam site of bhep for measuring the seismic response of dam body during an earthquake . this amc includes two periodic visits for checking the state of health of these instruments and one breakdown visit in case of any fault . , additional man days for the installtion of below mentioned gps system in seismograph installed at dam galleries to keep its time in proper calibrations with utc and other allied emergency works , if requred . , gps re-radiator kit for 200m signal for es&s make accelerograph / seismograph , consumable items like silica gel , electric spares , protections etc .