Safety design reviews preliminary

An applicant for a construction permit files a Preliminary Safety Analysis Repori (PSAR) presenting design criteria and preliminary design information, hypothetical accident analyses, safety features, and site data. An Environmental Report (ER) must be submitted to evtiluatc the env ironmental impact of the proposed facility, and information must be submitted to the. Uornev Cieneral and the NRC staff for antitrust review. 

The high-high probe is completely independent of the other probes and is hardwired to shut down the system completely, independent of the computer. (In the preliminary safety review, the hazards associated with HF overfeed were identified as important thus the independent high-high shutdown probe system was installed.) All systems are designed to fail into safe conditions. The HF control valves are air operated and of a design that makes it impossible for HF to contaminate the air supply. 

Assessment. An analysis of the hazards present in this laboratory show the most significant hazard to be the release of vapor CSM from engineering controls and into the workplace. The significance of this hazard mandates further efforts in system safety in the form of a Preliminary Hazard List (PHL) and a Preliminary Hazard Analysis (PHA). The user must in this instance take an active role in the design review process. 

First, the importance of learning lessons from past process safety incidents is highlighted in Section 3.2. The subsequent section presents preliminary hazard review procedure, risk matrix, what-if method, plot plan and layout review, pressure relief system review and fire safety design aspects. Section 3.4 presents PHA techniques and procedures hazards and operability analysis (HAZOP), failure modes and effects analysis (FMEA), instrumented protective system (IPS) design, fault trees, event trees, layer of protection analysis (LOPA) and finally SIS life eyele. The importanee of revision of PSI is highlighted in Seetion 3.5. 

Note The review of all the AND gates is best performed by someone other than the originator of the qualitative or quantitative analysis (e.g. an independent Compliance Verification Engineering or an Independent Safety Assessor). It is thus unlikely that this step can be completed before the Preliminary Design Review (PDR) and is likely to be iterative as the system architecture becomes more mature. 

During HR-5 construction, main design features and safety concepts of the NHR have been reviewed and approved by the Chinese National Nuclear Safety Administration (NNSA). The HR-200 design is based on the HR-5 practice. Their main design features are the same. Therefore the HR-200 will be licensable. Up to now the first HR-200 plant siting report and environmental impact assessment report have been reviewed and approved, the design certification of INET for NHR has been also released by National Nuclear Industrial Co. (NNIC), and the review on the preliminary safety analysis report is under way. 

In 1993, a thorough review of the project started in the framework of a co-operation agreement between ENEA (Italy) and the University of Rome "La Sapienza", with the mm at developing a basic design and at performing a Preliminary Safety Report of MARS nuclear plant, to be submitted to the Italian Nuclear Safety Authority. The Preliminary Safety Report was completed in May 1994. 

Preliminary safety analysis report completion Completion of all detailed design reviews Detailed construction planning Final cost estimate Final tender document... 

In the case of an SMPR project it is necessary to review in more detail phases A and B. In the precontractual activities, the model schedule assumes a letter of intent and the submission of a preliminary safety analysis report (PSAR) to obtain the construction license as a pre-requisite to the final contract signature. Depending upon the state of readiness of an SMPR design this may or may not be possible to perform within the one year shown, and it could in some cases extend up to five years, i.e. until the supplier has been selected, the PSAR has been prepared and the construction licence given. 

STATUS OF REGULATORY REVIEW The concept is not yet licensed. Formal interactions with the USNRC have been initiated and design review meetings with the NRC Advanced Reactor Group commenced in 1984. The Draft Licensing Plan Involves submittal of a PSID (Preliminary Safety Information Document) at the end of 1985 and proposes an NRC FDA (Final Design Approval) in 1992. 

Determine that hazards identified in the preliminary safety review and the subsequent design review have been properly addressed... 

For the regulatory review, the most important document to be included in a construction licence application is the preliminary safety analysis report (PSAR). It should define the design bases for the facility and include a detailed description of the site, facility and its operation. The PSAR should also include a safety assessment that is based on the design bases and specifications of the plant, site specific data and safety regulations and guidelines, if available. Occupational and public... 

A stated requirement of the HEAT/ACT project SPP was that the PSC should be prepared to support Preliminary and Critical Design Reviews (PDR and CDR). Producing the PSC would also ensure that the Interim Safety Case could be prepared in time to support first flight. 

Revise preliminary design of component Evaluate preliminary design Review economics and suitability of materials and process based on preliminary proportions. Consider overall compatibility and practicality of all materials and parts in component as a system Does it meet functional and performance requirements Is it compatible with other components that may interact with it, relative to effects of expansion and contraction, structural support or movement, fire safety, etc. ... 

As with other safety analysis tools, the facility hazard analysis should be performed as early in the program as feasible. The same hazard analysis format can be used, with the columns filled in with preliminary or available information. The facility hazard analysis should be revisited at the 30%, 60%, 90%, and 100% design review stages, updating the worksheets as information becomes available. When the acceptance inspection and operations review is conducted, the facility hazard analysis should again be updated. The same holds for facilities that are modified or retrofitted. 

This TECDOC presents a variety of innovative water cooled, gas cooled, liquid metal cooled and non-conventional SMR designs developed worldwide and examines the technology and infrastructure development needs that may be common to several concepts or lines of such reactors. The TECDOC also gives an updated definition of small reactors without on-site refuelling and provides a preliminary review of the passive safety design options for SMRs. 

In March 1992, the government approved the project for the constmction of a 10 MW pebble bed high temperature gas cooled test reactor (referred to as HTR-10). The basic design of HTR-10 was completed in 1994 [XVII-4.], and the constmction permit was issued after a licensing review of the preliminary safety analysis report and other relevant application... 

Supporting Assessment and Review As part of the different milestones of the systems engineering process [11], engineering artifacts (as well as the safety case) are to be reviewed and accepted before development proceeds. Simple queries on the safety argument can be used to determine whether the relevant obligations have been met. For example, during a Preliminary Design Review (PDR), we can query the safety case to establish whether or not all the identified safety requirements have been allocated. 

A preliminary system safety assessment (PSSA) is essential in order to determine (and agree) the depth of assessment needed, the criteria utilised and the manner in which the safety objectives are to be accomplished. The PSSA concentrates on the functions and vulnerabiUties of the system instead of the detailed analysis, and can thus be conducted prior to the definition of the system s architecture. The PSSA remains a live document until the final SSA can be issued. By the preliminary design review (PDR), the PSSA should include functional failure consequences to the aircraft and its occupants consequences of other possible malfunctions of a system (e.g. overheating) and their effects on surrounding systems consequences to the system of failure in other systems or parts of the aircraft, identification of any possible common-mode failures or cascade failures which my need detailed investigation the identification of possible vulnerabilities to flight crew or maintenance error. 

As we shall see in Chapter 5, the PHA is used in support of the Preliminary Design Review (PDR) milestone to develop the requirements for new procurements while developing the statement of work or procurement specification for new hardware for the program. Completion of the PHA is required in support of the PDR to verify that the technical safety requirements have been incorporated into the preliminary design of the item for procurement. Hazards identified in the PHA will be updated in the System Hazard Analysis (SHA) and the Subsystem Hazard Analysis (SSHA) as the life cycle progresses. 

Many correlations have been published for predicting the height of a transfer unit, and the mass-transfer coefficients several are reviewed in Volume 2, Chapter 12. The two methods given in this section have been found to be reliable for preliminary design work, and, in the absence of practical values, can be used for the final design with a suitable factor of safety. 

Design qualification—a formalized review of designs at a preliminary point in the project. Its goal is to independently confirm that the design conforms to both user requirements and regulatory, environmental, and safety regulations. 

Established excipients pose some issues for regulatory consideration. Such issues include the use of a well known excipient by an unapproved route, for example, inhalation of a material that has been used in oral formulations. In these cases, some preliminary toxicity studies may be necessary. Additionally, a well designed scientific review of safety data on the excipient will be necessary, with old findings fully evaluated. 

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