Flight Crew Air Transport Pilot (ATP)
Situational Awareness; Confusion
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Took Evasive Action
Procedure; Airport; Aircraft
While on the RNAV (GNSS) RWY 08 at MDPP; just prior to KELSO FAF we received a terrain; terrain; pull up pull up warning.  An escape maneuver was executed and the aircraft leveled off at approximately 4;000 on the RNAV (LNAV) approach path to the runway.  A missed approach was declared to Santo Domingo Control.  The aircraft broke out into VFR conditions over the airfield; called the field in sight and entered a downwind to land visually.  	The MDPP Briefing Page provides a caution to B757/767 aircraft regarding 'nuisance GPWS warnings;' and suggests that the aircraft 'must be configured for landing no later than the PP351;' the turn to final.  This note should be made more forceful.  Terrain terrain; pull up; pull up is hardly a 'nuisance' warning when IMC.  It is a life saving warning that cannot be ignored.  If it were made clear that the warning would be terrain terrain; or more forceful in its language to dictate non-standard approach procedures we may have fully complied with the Briefing Page notes.  Instead we intercepted the RNAV approach course at 180 knots; flaps 15.  Although we were stable with the auto-pilot/LNAV/VNAV our terrain closure rate still triggered the warning.  If the tolerance on this approach is so tight that the approach speed of the aircraft determines the safety margin then I argue the tolerances are unacceptably tight.  This approach procedure should be removed from the authorized [approach procedures]. Either way; I will personally never attempt that approach again; fully configured or not. The VOR 26 with a circle to land is 1;000 times safer.  [The RNAV] is an unsafe procedure.
B757 First Officer experiences a terrain warning approaching KELSO during the RNAV Runway 08 approach to MDPP and takes evasive action.