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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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.
These SAPs therefore require a level of interpretation by the assessor and make it clear that all relevant external hazards should be considered when determining the design basis events for both probabilistic and deterministic safety cases and provide the numerical targets for assessing whether the risk from external hazards is tolerable and ALARP.
Subscribe in sorksheet reader. Also, you can set the cutoff for which hazards are added to the BowtieXP case file under settings.
Workshdet natural hazards such a seismic the design basis event should be that which conservatively has a predicted return frequency not exceeding per year often, though not strictly accurately termed as the once in 10, year event. The possible effects on safety related equipment from a nearby impact may need consideration.
April 23, at 2: These hazards are referred to as internal hazards and can include, but are not limited to, radioactive inventory, fires, impacts, overpressures and explosions.
For each of the hazards, a spreadsheet will be generated.
In the case of external flooding, for example, the site defences become overtopped. However, if this approach is adopted, the assessor should ensure that the hazard definition is reasonable for the more remote levels and that relevant equipment responses are reasonable, i. Flooding Worksheeh UK nuclear facilities are potentially subject to flooding both by extreme precipitation directly qorksheet the site, and indirectly from rivers and the sea.
It has previously been accepted that one satisfactory approach to the demonstration of absence of an adverse cliff edge effect is via the PSA. Depending on whether the hazard can be adequately controlled, the Licensee may need to provide screening within building structures to protect equipment from electro-magnetic interference or install instrumentation and control equipment of a proven electro-magnetic compatibility. A demonstration is needed that there will not be a step change in the response of the installation to the hazard, in terms of the likelihood of a release of radioactivity, for an appropriate range of events more severe than the design basis event.
More recently uniform hazard spectra UHS have also been derived. Licensees should be expected to take the latest available predictions over the projected life of the facility, which may need to include the decommissioning phase of the installation in the submissions. It may, however, be possible to exclude some or all classes of aircraft on the grounds of low probability eg well below per annum of impact, thus obviating the need for structural design against impact or fuel fire.
Ductility is increasingly being required by nuclear and workshdet structural seismic design standards even where the structure is designed to remain elastic under the design earthquake loads.
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. As with the extreme temperature hazard it may be reasonable for the operational response to recognise some warning of extreme flooding, provided the necessary response measures can be initiated with sufficient margin. Actions are assigned to either discipline groups or individuals to ensure the mitigating control, or further study workdheet completed.
Design by Arie Gumilar Where this is not feasible in the case of existing facilities, the risk must be shown to be tolerable and ALARP. The Process of Hazard Identification is the procedure to assess all the hazards that could directly and indirectly affect the safe operation of that plant and or system, and is referred to as the Hazard Identification procedure or HAZID.
HAZID – HAzard IDentification Studies
In addition to structural effects, fuel fire is highly probable. Further guidance is available from the IAEA.
The risk matrices worksjeet is shown below: Typical problems workshedt be wind tunnelling between tall structures, or vortex shedding from upwind facilities. The hazard determination should therefore carefully examine the statistical dependencies in combining waves with still sea water levels. Under “Enabled Features”, you should see “Advanced” as shown here: Cliff edge 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.
Doing HAZID in Excel
If a PSA is not used to demonstrate the absence of an adverse cliff edge effect either an approximate PSA approach may be undertaken a NUREG describes a technique for earthquake hazard or a deterministic-plus-engineering judgment approach may be made. You may see the following warnings: Feedjit Live Blog Stats. Single failure criterion Safety systems required in response to any annual probability of exceedance external hazard should comply with the single failure criterion.
HAZID Hazard Identification ~ Chemical Engineering Processing
A wind load reduced from one in fifty years to one in two years has been used for the design of some facilities, and is broadly consistent with the foregoing time at risk considerations. In such cases, it needs to be shown that there is a reasonable margin between the design basis and the point at which this step change would occur. For other hazards, such as seismicity, the forces acting on the installation will continue to increase progressively with increasing size or proximity of the event.
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. 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.
Hydrogen Production By Steam Reforming. This file originated from an Internet location and might be unsafe. You may see the following warnings:. Share information about chemical engineering knowledge. It can be assumed that there will be at least several hours notice of extreme conditions developing, and often several days. Each area of the installation is considered against a checklist of hazards.
External hazards may particularly give rise to common mode or common cause failures. The flooding safety case should not be sensitive to the level of the hazard, and operational response may be required.