Preliminary Hazard Analysis report

Hazard Condition Item 2 Loss of Hydraulic Pressure. A small leak in the hydraulic cylinder system woidd result in a loss of pressure in the cylinder and a subsequent inability to maintain constant cyUnder volmne. Any damage to the cylinder jackhead would cause a leak of hydrauhc oil from the cylinder system. Such damage is possible because of an abrupt contact with the plunger mechanism and/or a failure in the neoprene seal between the jackhead and the plunger. The system safety analyst has learned from the preliminary hazard analysis report that there is no provision for oil recovery in the event of damage to the jackhead. 

Contracts were awarded in March 2000, and preliminary EDPs were drafted by the technology providers in June 2000. Each EDP includes drawings and documentation, a preliminary hazards analysis, and projected life-cycle costs and schedules for the technology package to be implemented at a particular site. The final EDPs were released in December 2000. Experimental tests to support the EDPs were begun in June 2000, but some had not been completed when this report was prepared. Einal reports are expected to be published in mid-2001. 

The MORT tools and techniques can be helpful in preparing a safety analysis report (SAR), the upstream safety product most frequently required for new DOE programs, but the more common system safety products (system safety program plan, preliminary hazard analysis, system/subsystem hazard analysis, operating hazard analysis) are not a dominant part of the MORT program and are seldom even referenced in System Safety Development Center (SSDC) documents. 

Introductory Information The analyst should provide basic information in this section of the report which describes the purpose and scope of the FMEA along with any limitations imposed on the analysis as a result (i.e., items not specifically within the scope of the analysis). The scope will also identify the type of FMEA (i.t., functional or hardware). Also included in the introduction section is an explanation of the methodology used to perform the analysis such as, but not limited to drawing reviews, examination of previous analyses (if applicable), evaluation of lessons learned, use of Preliminary Hazard List and/or Preliminary Hazard Analysis, and so on. Finally, any preestablished ground rules that may have been agreed upon should be provided here. Such ground rules typically limit or further narrow the scope of the FMEA, or just a portion of it, and should therefore be explained in the introductory pages of the report. 

Step I— The dendritic construction consists in the identification of the core conditions leading to hazards in the system. A preliminary hazard analysis has been performed in the monitored enterprise, and a checklist of behaviours leading to hazards has been identified. The dendritics leading to hazards have been classified in different groups. These dendritics are reported in Table 1. Many of the identified dendritics are workers behaviours however, some dendritics more related to contextual aspects, such as obstacles not clearly indicated, have been included. 

The SACs identification and creation should be done as soon as possible in a project (compare with section 6) e.g. either during development of the Safety Concept or while performing the Preliminary Hazard Analysis. But generally at anytime during a project, SACs are possible, e.g. even during the creation of the validation report. 

DOE O 5480.23 Nuclear Safety Analysis Reports For nuclear facilities only (Hazard Category 3 or above), requires preliminary and final hazard categorization and comprehensive hazard/safety analysis to support the conclusion that nuclear facility activities can be conducted without causing unacceptable health or safety impacts to workers, public, or environment. SAR prepared in accordance with DOE-STD-3009 or a BIO prepared in accordance with DOE-STD-3011. Annual updates to either SAR or BIO for those changes that affect the safety basis. Preliminary and final hazard categorization prepared in accordance with DOE-STD-1027. 

The techniques used to complete PHAs inelude What-iF analyses. Explosive Safety Checklist Analyses, General Industry Checklist analyses and FMEA analyses. The information from Preliminary Hazards Analyses, previous Final Safety Analysis Report analyses. Fire Hazards Analyses, and other... 

Potential external events were identified by reviewing previous Safety Analysis Reports of similar DOE facilities (Restrepo 1995) and the recommended list of external events used to evaluate commercial nuclear power plant risks (NRC 1983). In addition, an attempt was made to identify any other potential external-initiating event unique to the site that had not been considered in previous studies. It is important to note that operational accidents (e.g., criticality, internal fires) occurring inside the HCF and assodated radioactive material storage facilities are not considered in this screening process. These types of "internal initiating events are identified separately using preliminary hazard checklists (see Appendix 3A). 

A typical system safety task for hazard identification would be the preparation of a preliminary hazard list (PHL). Hazard identification or discovery is accomplished by reviewing lessons learned, accident reports, and other historical data. A PHL may be prepared through an informal conference, the use of checklists, and occasionally other techniques such as energy trace and barrier analysis (ETBA). 

New information gathered from additional desk studies and any site investigation is then collated and used to provide more complete descriptions of the candidate source-pathway-receptor pollutant linkages identified in the Phase la report. Each linkage is considered separately and estimates are made of the extent and strength of the contaminant source, its connectivity to the receptor and the level of hazard that is presented to the receptor. Finally, a preliminary assessment is made of the potential harm that hazards may pose to the receptors. From this analysis it is likely that one or more pollutant linkages will be recognised as the... 

FAY, J.A., A Preliminary Analysis of the Effect of Spill Size on the Level of Hazard from LNG Spills on Land and Water, Report DOE/EV-(K)02, US Department of Energy (1978). 

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