HAZID WORKSHEET. Project: ANOA PHASE 4 – AGX COMPRESSION RECONFIGURATION PROJECT Node Description: DLB Activities in the vicinity and. As a result of the HAZID, 80 identified hazards in total were .. the workshop were also recorded relevantly in the HAZID worksheet by an. The HAZID study achieved its aim of identifying the nature and scale of hazards that Attachments: Power Plant Risk Register Spreadsheet.
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You may see the following warnings: For example in the case of sea flooding, extreme wind not only affects wave heights but can also elevate still sea levels through storm surge. The flooding safety case should not be sensitive to the level of the hazard, and operational response may be required.
Feedjit Live Blog Stats. Below you see a BowTie diagram, which was dragged in from the scrap book.
Single failure criterion Safety systems required in response to any annual probability of exceedance external hazard should comply with the single failure criterion. To check if you have the Advanced features, follow these steps: A clear understanding of all the possible event chains leading to the most critical worjsheet scenarios is needed to mitigate for example, the complexity of any plant and its operation, which nevertheless exposes it to any number woksheet accident scenarios from interrelated systems which could provoke failure or domino effect from other systems, components or structures located within the proximity effecting the worksheft operation of the plant.
Ductility provides a better assurance than elastic margins for the ability to withstand beyond design basis seismic events, and also gives confidence in the ability of structures to cope with the uncertainty dorksheet the actual hazard spectrum peaks etcuncertainties in the material data, uncertainty in the analyses, and uncertainty concerning other simultaneous loads.
The potential for electro-magnetic interference to instrumentation and control equipment should be considered. When relating to external and internal hazard assessment, a judgment on the frequencies at which hazard levels should be determined, in terms of Reactor Plant, guidance for this can be found in the HSE NII Safety Assessment Principals workshheet or SAPs and allow for plants that cannot give rise to large radiation doses to be designed against less onerous events.
A wind load reduced from one in fifty years to one in workksheet years has been used for the design of some facilities, and is broadly consistent with the foregoing time at risk considerations.
Also, you can set the cutoff for which hazards are added to the BowtieXP case file under settings. The residual seismic risk from events less probable than the DBE can be a significant contributor to the total risk.
Doing HAZID in Excel
Where this is not feasible in the case of existing facilities, the risk must be shown to be tolerable and ALARP. The extreme ambient temperature hazard is ameliorated by wor,sheet slow development of extreme conditions and the relatively long timescales for the plant to respond.
Aircraft crash For aircraft crash structural demand depends on the mass, rigidity, velocity and engine location of any aircraft assumed to impact directly or skid onto the structure, and also the angle of incidence of the impact direct or skidding. UHS spectra have been derived for various confidence levels, including haid expected level, which is appropriate for seismic PSA and assessors workshwet consider whether all relevant external hazards are listed in the fault schedule.
This has the merit, usually, of exploring the response of the plant to a wide range of hazard levels and is accepted internationally as a reasonable approach for external hazards.
Ductility is increasingly being required by nuclear and non-nuclear structural seismic design standards even where the structure is designed to remain elastic under the design earthquake loads.
The assessor should establish that the potential threats are recognised by the operators and appropriate prearranged responses are embodied in operating instructions. The estimated aircraft crash frequency may seek to take into account any flying restrictions which may apply to the site. Each area of the installation is considered against a checklist of hazards. For some hazards a point wokrsheet be reached where there is a step change in the effect on the installation.
HAZID – HAzard IDentification Studies
By its very nature the definition of the flooding hazard at small annual probabilities of exceedance will be subject to significant uncertainty and it must be assumed that the natural phenomena which can be the cause of flooding may occur together. The Licensee will also need to demonstrate that there will not be a disproportionate increase in risk from an appropriate range of events which are more severe than the design basis event. Because of this, you have to unblock this functionality the first time you open the file in Excel.
The procedure of hazard identification is broken down and categorised into the two streams that can affect the system both directly and indirectly, and is referred to as Internal Hazards and External Hazards.
If so, the assessor should be satisfied that this is justified. Macros have been disabled. Most UK nuclear facilities are potentially subject to flooding both by extreme precipitation directly onto the site, and indirectly from rivers and the sea.
The external hazards safety case should consider all potential sources of external missiles and explosion. A hazard can be defined as any operation that could cause an Event release of toxic, flammable or explosive chemicals, gases or any action that could result in injury to personnel or harm to the environment. The effects of climate change should also be taken into account see section 4.
External man-made sources include radar and communication systems. For each of the risk matrices, the frequency indicates how often the top events lead to the consequences in this category. For each of the risk matrices, the severity is the worst that can happen when the top events occur, for each of the categories.
Seismic hazard definition should include a reasonable frequency distribution of accelerations, i. This long period ground motion hazard may be considered separately from the design basis spectra, being a separate, infrequent hazard. You can now drag elements from the scrap book onto your BowTie diagram.
HAZID Hazard Identification ~ Chemical Engineering Processing
April 23, at 2: It has also been demonstrated in numerous earthquakes that structural ductility is very desirable. Liaison concerning flying restrictions around nuclear licensed sites is handled by NSD’s Strategy Unit.
This will be more significant for the heavier classes of aircraft because of the quantity of fuel wprksheet. Alternatively, the trend for new design is increasingly to show that the plant will accommodate the seismic forces through a ductile response without any danger of a release of radioactivity occurring.