John Kruppa;814 Graham St.;Belle Vernon;died Thursday;April 23;1987;at 7:30 a.m.in Greensburg Nursing and Convalescent Center.  He was 80.  Mr.Kruppa was born in Stockdale on Oct.1;1906;a son of the late Coleman and Anna Kruppa.  He was a lifelong resident of the Mon Valley and was a member of St.Sebastian Roman Catholic Church;Belle Vernon;and its Holy Name Society.  He was also a member of the Jednota Lodge;Roscoe;and R.E.A.P.   He had retired from the Allenport plant of Wheeling-Pittsburgh Steel Corp.  In addition to his parents;he was preceded in death by two brothers;Michael and Coleman Kruppa;and a sister;Ann Lagazza.  Survivors include his wife;Elizabeth Kinder Kruppa;a son;John R.Kruppa of Carroll Twp.;two daughters;Mrs.Damon (Mary Lou) Turek of Beaver Falls and Joanna Kruppa at home;two brothers;Paul of Stockdale and Stephen of Roscoe;two sisters;Mrs.Carl (Helen) Wauchfus of Stockdale and Mrs.Mary Hara of Reston;Va.;and three grandchildren.   Friends will be received at the Leonard J.Parzynski Funeral Home;626 Broad Ave.;Belle Vernon;on Friday from 2 to 4 p.m.and 7 to 9 p.m.  Prayer services will be held at the funeral home Saturday at 9:30 a.m.followed by Mass of Christian Burial at 10 a.m.in St.Sebastian Roman Catholic Church;Belle Vernon.  Burial will follow in Belle Vernon Cemetery.  The Leonard J.Parzynski Funeral Home is handling the arrangements.