A SAN FRANCISCO MAN HAS BEEN ARRESTED FOLLOWING A NATIONWIDE MANHUNT.    42-YEAR-OLD RYAN KELLY CHAMBERLAIN THE SECOND WAS DETAINED MONDAY EVENING FOR ALLEGEDLY POSSESSING EXPLOSIVE MATERIALS.    ACCORDING TO OFFICIALS, CHAMBERLAIN DISAPPEARED AFTER THE F-B-I SEARCHED HIS APARTMENT SATURDAY.    THE RAID RECOVERED AN ILLEGAL DESTRUCTIVE DEVICE ALONG WITH OTHER BOMB-MAKING MATERIALS.    CHAMBERLAIN FACES UP TO 10-YEARS IN PRISON IF CONVICTED.