On September 26, 2019, a large-scale fire affected the Lubrizol industrial site in Rouen, France. The management of the consequences of the accident gave rise to the implementation of an original body within the variety of existing mechanisms of citizen participation on industrial risks: “the Transparency and Dialogue Committee (mentioned hereafter as TDC)”. This committee brought together various actors concerned by the consequences of the fire. Its intended purpose was to monitor over time all the issues related to the consequences of the accident and to share all the information available. Ten sessions of the TDC were held between October 11, 2019, and December 10, 2021. The content of these minutes is considered under the background of the economy of worth (Boltanski & Thevenot, 2006) which provide a theoretical framework of the dynamics linked to the presence of multiple rationalities. An economy of worth stipulates what things count, how, and in what ordered hierarchy, thereby offering a coherent space within which people interact. Instead of seeking for the determinants of the behavior of individuals, the objective of the study is rather to see how they construct and use argumentative resources in situations where they are led to justify their claims. The TDC as a specific structure for citizen participation on industrial risks provides materials to analyze the potential foundations of agreement and the necessity to justify through this “test of justification “. In that kind of test, the actors refer to specific principles (i.e. a form of common good, a general value based on a conception of what is right in this circumstance). This paper presents how the TDC can be analyzed through the different "logics of justification" used, in what extend these logics respond to public concerns and which "common superior principles" would be valuable candidate to resolve conflicts and help to reach an agreement between the stakeholders.