[en] The purpose of this report is to document the final hazard classification and resultant commitments for the N Basin (located at the Hanford Site in Richland, Washington) segment quiescent state, and to quantitatively examine the hazards and identify appropriate controls as an auditable safety analysis. The baseline identifies and evaluates 7 potential hazard vulnerabilities applicable to the quiescent state; based on that evaluation, appropriate controls were established to safeguard workers and the environment. These hazards were further reviewed to determine any significant potential scenarios that could credibly expose individuals, to establish the final hazards classification. Results of the review: two such scenarios - pool draindown and a contaminated trash fire - are credible, although extremely unlikely. Each is a small fraction of the Category 3 threshold quantity and neither could credibly endanger personnel in the basin. The final hazard classification for the N Basin quiescent state is radiological