atw - International Journal for Nuclear Power | 02.2022

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atw Vol. 67 (2022) | Ausgabe 2 ı März OPERATION AND NEW BUILD 44 to the classical licensing process) [4]. It was agreed that this will be useful to enlarge on one hand the applicability of the existing regulations and to include on the other hand the specificities of LFR innovative technology. Following this agreement, the ALFRED licensing process will consist of two main stages: a pre-licensing phase, followed by the well-known, traditional licensing steps. In developing the vision on the design validation process of the ALFRED demonstrator, the following elements were considered [3], [4]: p the parties involved in the whole process; p the responsibilities assumed by each of them; p all involved phenomena and important aspects in demonstrating safety; p definition of the requirements and validation steps for the project. The FALCON Licensing task force experts have agreed that the preparatory phase will focus on the following aspects: p identification of the international references that might be used to complement the Romanian regulatory framework for an LFR-technology-specific application; this is mainly related to analysis of the existing codes and standards, and identification of those requiring adaptation, interpretation and deviations in order to address the unique characteristics of non-LWR technology. It goes without saying that whenever the proposed codes and standards fall short in providing the necessary confidence on a specific design detail, dedicated experiments will be agreed upon to produce the necessary evidences. p identification of those safety relevant phenomena which are connected with the codes and standards proposed as reference, but whose justification is not present in the codes and standards; following discussion, it is foreseen the development of an experimental programme (“safety demonstration programme”) suited for demonstrating that the provisions in the codes and standards are justified in view of their use in the subsequent licensing; p identification of the needs for validation of safety computer codes (new developed ones, or existing ones that need to be modified or will be applied to new conditions), including any R&D activities associated to cover the gaps; p qualification, by CNCAN, of the quality management systems of all FALCON members, depending on their role in the project (e.g., research and development, codes development and/or validation, plant design) and their contribution to the licensing application that will be submitted. The pre-licensing phase will have as main goal the preparation activities for the “Design Validation phase” [3], [4]. This supplementary phase, although will increase the licensing period, will be very useful both for the applicant and for the regulatory authority to get mutual understanding, respectively, of the licensing specificities and of the technology. The “design validation” stage is intended to provide preliminary feedback on the design and to consolidate the RD&Q roadmap for substantiating the safety demonstration programme [3]. It is intended to require a preliminary review of ALFRED design, with the aim to assess its compliance with the national regulatory requirements and to identify any key barriers for authorization. In this way, the overall project will be reviewed and evaluated regarding its suitability for obtaining the construction and operating license, after the site-specific factors will be taken into account. Some changes in the design can be expected, following discussions, or requests of CNCAN. At the end of the pre-licensing phase, it is foreseen the issuance of a CNCAN statement, confirming that no major safety concerns are anticipated from the ALFRED conceptual design, and that nothing is foreseen to impair the following licensing phase, provided the safety demonstration program is successfully executed. LBD In order to prepare the licensing process, a draft of the Licensing Basis Document (LBD) was submitted to CNCAN. LBD will constitute the reference basis for the whole process of licensing. This document is based on Romanian regulations, supplemented, wherever necessary, by other international norms, industrial standards and codes, together with quality standards. For the design phase, the main regulatory requirements are indicated in NSN-02 [2]. The LBD defines the safety and licensing requirements applicable to ALFRED and the regulatory requirements (interfaces). The following are specified in the LBD: p Applicable regulatory requirements, including those indicated to authorities other than CNCAN; p List of applicable codes and standards, including international safety standards and guidelines; p Project safety requirements; p List of basic design events; p Safety analysis requirements. At the beginning of the licensing process, the designer is expected to provide a list of the applicable codes and standards intended to be used as a basis for the design, procurement and construction. Operation and New Build Setting-up the Pre-Licensing Phase for Alfred ı Mirela Nitoi
atw Vol. 67 (2022) | Ausgabe 2 ı März Traditionally, the nuclear design codes and standards are the accepted basis for the design verification of technical solutions in any nuclear facility, but the innovative coolants and candidate materials are not thoroughly covered by the existing nuclear design standards and therefore, a list of both applicable and amended nuclear codes and standards is necessary to be developed. The existing nuclear codes and standards were analyzed using dedicate efforts under PRO ALFRED WP2 umbrella [7], in terms of their applicability to innovative reactor projects [5]. To catalogue the useful codes and standards, a hierarchical structure was developed, containing 3 levels (Compulsory, Necessary, Recommended) to include the codes and standards, depending on their flexibility regarding the requirements [5]. The performed analysis addresses the corresponding "necessary" codes and standards, from which some may require interpretation before being applied to the innovative project. The recommended codes will be defined during the in-depth activity of detailed design. For each standard considered in the analysis, a preliminary assessment of its applicability to the ALFRED project was performed [5]. Following the analysis, a consistent subset of applicable codes and standards [5] selected by the designer for the ALFRED systems, structures and components was obtained. These codes will constitute the starting point of the discussion between CNCAN and FALCON Consortium, having the goal to elaborate and agree on the list of standards and norms applicable to the ALFRED demonstrator project. In order to receive the authorization for construction and for operation, a comprehensive safety assessment of the nuclear facility must be carried out [2] to confirm that the design considered for manufacture, construction and operation meets the safety objectives and requirements set out at the beginning of the design process. All design activities, as well as the subsequent verification analyses, make large use of computation, through dedicated codes. FALCON members have made sustained efforts to identify, adapt and validate, to different extents, these codes for their specific use in LFRs. An investigation regarding the computer codes available that may be applicable to the LFR domain was performed. For each macrosystem and specific scientific field applicable to LFRs, the available computer codes were analyzed, discussing their maturity for use in the authorization application [5]. Moreover, all those codes whose results are used in filing the Safety Analysis Report (SAR) which substantiates the ALFRED licensing, will have to be qualified by CNCAN, which means that a validation dossier will have to be prepared by FALCON, and provided to CNCAN for approval. CNCAN will analyze the LBD and provide guidance on further improvements and additional requirements for the project. LIP A LIP is intended to be elaborated, in which the following will be established: p The extent to which the schedule for specific submittals, meetings, etc., will be included in LIP p Updating circumstances for LIP (periodically or not). The document may include periodic reviews of the schedule, including management-level review of schedule performance following submittal and docketing of an application. p Possible modalities to be used by the applicant to notify regulatory staff about changes of information contained in LIP p A schedule for pre-application interactions, planned applicant submittals (pre-application submittals), and feedbacks p Important topics for discussion In the pre-application stage, the topics that will be discussed include: Project management meetings; Technical exchanges, including issue identification and resolution meetings and regulatory staff familiarization sessions; Establishment of QA program, etc.; Documents that will be elaborated (Topical Reports, technical reports, white papers, etc).; Preapplication readiness assessment. p A specific schedule for planned deliverables The applicant and CNCAN will use LIP to establish agreement on the schedule, to communicate changes to the scope or schedule of submittals, and to agree on prioritization of applicant and regulatory staff resources in development and review of the submittals. CONCLUSIONS p ALFRED licensing process will be performed in two main stages: p a pre-licensing phase, including the preparatory activities to facilitate the effective licensing phase of the design (validation); p licensing phases for design, siting, construction, commissioning, operation. p The pre-licensing phase will be very useful both for the applicant and for the regulatory authorities to get mutual understanding, respectively, of the licensing process specificities and of the technology peculiarities; OPERATION AND NEW BUILD 45 Operation and New Build Setting-up the Pre-Licensing Phase for Alfred ı Mirela Nitoi
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atw - International Journal for Nuclear Power | 02.2022

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