Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Extended shutdown

The operating organization shall take the necessary decisions as soon as possible to reduce the period of extended shutdown to a minimum. During a period of extended shutdown, the operating organization shall consider the consequences of the shutdown for the fulfilment of the licence conditions (e.g. for the physical protection of the fuel) and for the qualification of the operating staff. [Pg.94]

For some operating research reactors, the need for their ultimate decommissioning was not taken into account in their design. Nevertheless, all operational activities at research reactors, including inspection, periodic testing [Pg.94]

The decommissioning plan shall include an evaluation of one or more approaches to decommissioning that are appropriate for the reactor concerned and are in compliance with the requirements of the regulatory body. The following are examples of approaches to decommissioning  [Pg.95]

In developing the decommissioning plan, aspects of the reactor s design to [Pg.95]

The decision to decommission a reactor is often made after a period of extended shutdown. Occurrences at the reactor over this period shall be taken into consideration in developing the decommissioning plan. [Pg.96]


There are other normal maintenance items that require extended shutdown periods but can probably be scheduled during other changeovers. For example ... [Pg.66]

A tank track of flammables may have ranked low in a safety analysis as the consequence footprint of such materials can be much smaller than that of toxics. But, if an attack along this route has the ability to result in a consequence that could significantly damage a critical transportation route and result in an extended shutdown for cleanup and repair, then this segment of the route may warrant escalation in the security review. Also, the shipment could be hijacked, enabling the flammables to be diverted from the planned route. [Pg.119]

In 996 because of the extended shutdown of PHENIX no iiiither progress could be achieved in dose/bum-up values. [Pg.53]

The primary causes of accelerated attack of copper alloys by polluted seawater are (1) the action of sulfate-reducing bacteria under anaerobic conditions (bottom muds and sediments) on the natural sulfates in seawater in coastal harbors and estuaries, and (2) the putrefaction of organic sulfur compounds fiom decaying plant turd animal matter within seawater systems during periods of extended shutdown. [Pg.568]

Relied upon for safe shutdown and cool-down of the reactor under normal plant conditions and for maintaining the reactor in a safe condition for an extended shutdown period. [Pg.409]

The condition of the vessels became of increasing concern in the final years of operation and the need for regular examination significantly extended shutdown times. The basic problem was one of choice of material a problem of availability of material during fabrication led to the use of a stabilised stainless steel and this resulted in a susceptibility to delayed reheat cracking. [Pg.50]

Safety considerations for research reactors in extended shutdown... [Pg.1]

SAFETY CONSIDERATIONS FOR RESEARCH REACTORS IN EXTENDED SHUTDOWN... [Pg.2]

This report reflects the experience in extended shutdown of operating organizations and/or regulatory bodies in Belgium, Germany, Hungary, Israel, the Netherlands, the Russian Federation, Turkey, Ukraine and the United States of America. The IAEA staff members responsible for the publication were D. Litai and J. Bastos of the Division of Nuclear Installation Safety. [Pg.3]

According to the IAEA Research Reactor Database, in the last 20 years, 367 research reactors have been shut down. Of these, 109 have undergone decommissioning and the rest are in extended shutdown with no clear definition about their future. Still other research reactors are infrequently operated with no meaningful utilization programme. [Pg.7]

This publication addresses problems of the facilities in extended shutdown with no clear definition about their future, but which may be returned to operation at some future time. If the option decided upon is decommissioning, relevant IAEA publications to be consulted include Refs [1-3]. [Pg.7]

It is not the intention of this publication to encourage the practice of extended shutdown. In fact, it is advisable that a reactor be decommissioned if it cannot be operated or refurbished. [Pg.8]

The three annexes contain information on the extended shutdown of three research reactor facilities in three Member States. The information is based on a questionnaire drawn up by the IAEA. [Pg.8]

The planning for extended shutdown consists of a judicious selection of relief that can be allowed in place of the normal operational regime maintained in the facility. This relief may be sought in any of the following areas ... [Pg.10]

It is important that this relief not lead to a decrease the safety of the installation. Therefore the extended shutdown needs be well planned in advance. The planning includes securing the necessary approvals. [Pg.10]

In order to establish a safe extended shutdown period with some relief from the normal operating regime, the measures to be taken are planned in detail and reviewed by the competent committee(s) and/or authority. If the period of extended shutdown increases over time, the plan is reviewed and revised accordingly. [Pg.11]


See other pages where Extended shutdown is mentioned: [Pg.241]    [Pg.494]    [Pg.494]    [Pg.911]    [Pg.12]    [Pg.104]    [Pg.53]    [Pg.94]    [Pg.94]    [Pg.47]    [Pg.5]    [Pg.5]    [Pg.5]    [Pg.5]    [Pg.5]    [Pg.5]    [Pg.5]    [Pg.5]    [Pg.6]    [Pg.7]    [Pg.7]    [Pg.8]    [Pg.8]    [Pg.8]    [Pg.8]    [Pg.10]    [Pg.10]    [Pg.10]    [Pg.10]    [Pg.11]   


SEARCH



Shutdowns

© 2024 chempedia.info