WWW.ABSTRACT.XLIBX.INFO
FREE ELECTRONIC LIBRARY - Abstract, dissertation, book
 
<< HOME
CONTACTS



Pages:   || 2 | 3 | 4 | 5 |   ...   | 35 |

«Item 7b Severe Accidents Related Issues Preliminary Monitoring Report Report to the Federal Ministry of Agriculture, Forestry, Environment and Water ...»

-- [ Page 1 ] --

ETE Road Map

According to Chapter IV and V of the

“Conclusions of the Melk Process and Follow-Up”

Item 7b

Severe Accidents Related Issues

Preliminary Monitoring Report

Report to the Federal Ministry of Agriculture,

Forestry, Environment and Water Management

of Austria

Vienna, August 2004

ETE Road Map

According to Chapter IV and V of the

“Conclusions of the Melk Process and Follow-Up”

Item 7b

Severe Accidents Related Issues

Preliminary Monitoring Report

Report to the Federal Ministry of Agriculture, Forestry, Environment and Water Management of Austria Vienna, August 2004 Project Coordination Katja Lamprecht (Umweltbundesamt – Federal Environment Agency Ltd. – Austria) Layout Manuela Kaitna/Claudia Kubelka (Umweltbundesamt – Federal Environment Agency Ltd. – Austria) Technical Project Management ENCONET Consulting (Austria) Institute of Risk Research, University of Vienna (Austria) ARCS Seibersdorf Research (Austria) Technical Support from* Dipartimento di Ingegneria Meccanica, Nucleare e della Produzione (DIMNP), University of Pisa (Italy) Dycoda LLC (United States of America) ENPRO-CONSULT Ltd. (Bulgaria) Fortum Nuclear Services (Finland) Institut für Kern- und Energietechnik (IKET), Forschungszentrum Karlsruhe (Germany) A. Madonna, consultant (Italy) H. Karwat, consultant (Germany) V.B. Morozov, consultant (Russian Federation) NRG, an ECN KEMA Company (The Netherlands) Nuclear Services Corporation, Leiden (The Netherlands) The above-listed organisations and individuals provided calculational support, technical analysis, and technical support to the Technical Project Managers during the course of the project, and their valuable contributions are acknowledged.

Enconet and IRR-ARCS jointly share responsibility for the Preliminary Monitoring Report (PMR), including its contents and conclusions. No attribution of responsibility for the contents and conclusions of the PMR to the above-listed organisations and individuals is intended or implied.

The present report was financed by the Federal Ministry of Agriculture, Forestry, Environment and Water Management of Austria.

Masthead Editor: Federal Environment Agency Ltd.

Spittelauer Lände 5, A-1090 Vienna, Austria In-house reproduction © Federal Environment Agency Ltd., Vienna, August 2004 All rights reserved ISBN 3-85457-746-X Note to the Reader The report is published on the Temelín homepage provided by the Federal Environment Agency at http://www.umweltbundesamt.at.

Should you encounter technical problems, please do not hesitate to contact mailto:

marlene.engel@umweltbundesamt.at.

ETE Road Map - Preliminary Monitoring Report – Item 7b: Severe Accidents Related Issues 1

EXECUTIVE SUMMARY

I. Basis and the background for the project The Republic of Austria and the Czech Republic have, using the good offices of Commissioner Verheugen, reached an accord on the “Conclusions of the Melk Process and Followup” on 29 November 2001. In order to enable an effective use of the “Melk Process” achievements in the area of nuclear safety, the Annex I of this “Brussels Agreement” contains details on specific actions to be taken as a follow-up to the “trialogue“ of the “Melk Process” in the framework of the pertinent Czech-Austrian Bilateral Agreement.

Furthermore, the Commission on the Assessment of Environmental Impact of the Temelín NPP - set up based on a resolution of the Government of the Czech Republic - presented a report and recommended in its Position the implementation of twenty-one concrete measures (Annex II of the “Brussels Agreement”).

The signatories agreed that the implementation of the said measures would also be regularly monitored jointly by Czech and Austrian experts within the Czech-Austrian Bilateral Agreement.

A “Roadmap” regarding the monitoring on the technical level in the framework of the pertinent Czech-Austrian Bilateral Agreement as foreseen in the “Brussels Agreement” has been elaborated and agreed by the Deputy Prime Minister and the Minister of Foreign Affairs of the Czech Republic and the Minister of Agriculture and Forestry, Environment and Water Management of the Republic of Austria on 10 December 2001.

The Federal Ministry of Agriculture, Forestry, Environment and Water Management entrusted the Umweltbundesamt (Federal Environment Agency) with the general management of the implementation of the “Roadmap”. Each entry to the “Roadmap” corresponds to a specific technical project [see ANNEX C].

The objective of the Roadmap process covered by the item 7 as stated in Annex I of the “Brussels Agreement” is: "Effective prevention and mitigation of consequences of beyond design basis accidents (severe accidents)”.

Annex I provides the following statements regarding the “Present Status and specific Actions

Planned”:

“A set of preventive and mitigative measures is, at present, applied in NPP Temelín with respect to beyond design basis accidents. These include software and hardware measures, among others, e.g. Symptom Based Emergency Operating Procedures, Technical Support Centre, Post Accident Monitoring System, Emergency Preparedness.

For the purpose of emergency preparedness, the PSA was employed with the aim to identify and group events with different initiating occurrences, but with similar end-effects. On the basis of this assessment the relative risk was estimated for specific events in order to select those, which will serve for the determination of emergency response activities (pre-planned, reactive).





Severe Accidents Management Guidelines (SAMG) as a state-of the-art tool will complete the whole system of mitigation measures with respect to the beyond design basis accident management. The project for SAMG development is scheduled to be finished by end 2002 to be followed by validation.

2 ETE Road Map - Preliminary Monitoring Report – Item 7b: Severe Accidents Related Issues To foster mutual understanding two lines of activities will be followed within the framework of

the bilateral agreement:

a) A Working Group on comparison of calculations regarding the radiological consequences of BDBA with a view to harmonise the basis for emergency preparedness will be established.

b) The exchange of information related to SAMG will include discussion on the analytical basis as well as on corresponding software and hardware measures. " The issue (a) has been covered in a separate project PN1 [see ANNEX C], the issue (b) is covered by this project.

Refering to Chapter IV of the “Brussels Agreement” and the principles of the “Roadmap”, a number of issues identified in the “trialogue” of the Melk Process are found suitable to be followed-up in the framework of the Bilateral Agreement. The following seven issues are closely

related to the topic of item No. 7 (b) and are therefore also covered in this project:

• Issue No. 1 Containment bypass and preliminary-to-secondary (PRISE) leakage accidents

• Issue No. 4 Containment Design and Arrangement

• Issue No. 5 Probabilistic Safety Assessment and Severe Accidents

• Issue No. 6 Emergency Operating Procedures EOPs & Severe Accident Management Guidelines (SAMGs)

• Issue No. 16 Hydrogen Control

• Issue No. 26 Beyond Design Bases Accident Analysis

• Issue No. 29 Technical Basis for Temelín Emergency Planning Zones (EPZs) The Roadmap specified that the related Specialists’ Workshop would be held in the 1st half of 2003 to discuss this issue.This workshop on the “Roadmap” item No. 7 was conducted in Prague on 17 and 18 June 2003 according to Article 7 (4) of the Bilateral Agreement of the Exchange of Information on Nuclear Safety. This workshop was the key element in the monitoring process. The analysis of information made available there played a significant role in the development of the basis for the Preliminary Monitoring Report.

A Specialists’ Team of international experts was committed by the Umweltbundesamt (Federal Environment Agency) on behalf of the Austrian Government to provide technical support for the monitoring on the technical level of the implementation of the SAMGs Issue as listed in Annex I of the Conclusions of the Melk Process and Follow-up. This specific technical project is referred to as project PN7 comprising altogether seven predefined “project milestones” (PMs).

Consideration of beyond design basis accidents (BDBAs) of the NPP is an essential component of the defence in depth approach used in nuclear safety. BDBAs have low likelihood, but may have significant consequences resulting from the degradation of nuclear fuel. It is worth noting that accidents of low likelihood, but more severe than those taken into account in the design basis (i.e. BDBAs), have not been explicitly considered in the design of nuclear power plants which are currently under operation. However, the possibility of severe accidents has been recognized later as an important safety issue and addressed in comprehensive and systematic way for most of the operating plants.

ETE Road Map - Preliminary Monitoring Report – Item 7b: Severe Accidents Related Issues 3 In accordance with the current safety philosophy the consideration of severe accidents in

NPPs usually includes the following elements:

• Identification of event sequences that lead to severe accidents;

• Consideration of existing plant capabilities, including the possible use of some systems beyond their originally intended function, to return the plant to a controlled state and to mitigate the consequences of the severe accident;

• Identification of the permissible degree of non-uniformities in the hydrogen distribution in the atmosphere,

• Evaluation of potential design changes which could either reduce the likelihood of these events or mitigate the consequences;

• Establishing accident management procedures, based on representative and dominant severe accidents.

The set of actions taken during the evolution of an event sequence towards a design basis accident (DBA) is known as Emergency Management and once the sequence enters any BDBA sequence – Accident Management (AM). The AM is intended to prevent the escalation of the event into a severe accident, to mitigate the consequences of a severe accident, to reestablish critical safety functions and to return the plant to a controllable safe state. Accident Management Programmes (AMP) based on this concept were adopted in many nuclear plants starting from early 1980s. AMPs comprise plans and actions undertaken to ensure that personnel with responsibilities for AM are adequately prepared to take effective on-site actions to prevent or to mitigate the consequences of a severe accident and, when deemed necessary, to plan and implement plant functional modifications.

The Temelín Nuclear Power Plant (NPP), being of an original Soviet design, which was later upgraded with equipment following western philosophy, addressed severe accident management (SAM) in the later construction phase. Considering that the process of SAM implementation is not completed and information on the approach taken at the Temelín NPP is insufficient the “Severe accident related issues” remained as one of the items to be addressed during the follow up to the Melk process.

II. The objectives of the PN7 project

Enconet and IRR-ARCS defined the following additional objectives in order to implement this

overall objective:

• The principal objective of the project is to provide technical support and the expertise to assess the adequacy of the development and implementation of SAMG at the Temelín NPP, as well as the overall approach to the issue of severe accidents at Temelín. (see also the list of issues to be tackled according to the “Brussels agreement” (ANNEX I).

• The specific objective of the horizontal segment is to assure that all issues that need to be addressed within evaluation of Severe Accident Management for Temelín are highlighted to allow for an evaluation considering state-of-the-art requirements and criteria as applied in European Union (EU) and/or the United States (USA).

• The specific objective of the vertical segment is to assure that specific contributors to early containment failure (such as hydrogen combustion) are included within the evaluation of SAM for Temelín.

4 ETE Road Map - Preliminary Monitoring Report – Item 7b: Severe Accidents Related Issues III. Main tasks accomplished within PN7 project III.1 Identification of severe accidents issues and scenarios The issues, which are of relevance for understanding the phenomenology of severe accidents, have been identified and relevant information collected. This includes all the accident phenomena, which have been identified (and for which specific reactors were analyzed) in the western countries and for Soviet designed reactors. Also issues, which are being discussed in research fora in Europe and in the USA, have been added to the list.

After the issues had been identified, their applicability for a WWER 1000 was investigated.

This work resulted in a list of issues, which are of relevance for a WWER 1000 and Temelín in particular. This issue list has served as a basis for the further investigation of Severe Accident issues important for Temelín.

III.2 Identification of approaches to prevention and mitigation of severe accidents In addition to the identification of scenarios, the issue of prevention of severe accidents and approaches to mitigation have been investigated, using the western practice as well as the findings of the severe accident analyses of WWER 1000 units.

III.3 Review of applicability of Severe Accident issues and prevention/mitigation to Temelín The specific applicability of severe accident issues to Temelín has been investigated to evaluate, which of the issues are of relevance and of interest for further studies. For this purpose information was drawn from other WWERs 1000 plants and considering Temelín specific upgrades which are of relevance.

From the list of issues, which are applicable to Temelín, those, which are open issues or potentially problem issues in Temelín have been selected.



Pages:   || 2 | 3 | 4 | 5 |   ...   | 35 |


Similar works:

«Demystifying Farmer Field School Concepts Kevin D Gallagher 1, Arnoud R Braun 2 and Deborah Duveskog 3 This article responds to the recent paper on farmer field schools (FFS) by Dr. Kristin Davis in the Journal of International Agricultural and Extension Education, Volume 13, Number 1, page 91-97 which was subsequently noted in the ECAPAPA Newsletter Vol. 9 No. 06. The paper raises some interesting issues in agricultural extension, but tends to confuse some aspects of FFS such as notions of...»

«BIBLIOGRAPHY A. PRIMARY SOURCES (i) Unpublished Alvord Emery D., “The Gospel of the Plow,” Unpublished, 1950. Gwerengwe J., Estate Manager, Sanyati Main Estate, File: 6.1 Management Meetings, “Minutes of the Meeting Held in the Sanyati Guest House on Saturday 25 February 1989 to Review the Cotton Picker Turn Out.” Ministry of Lands and Water Resources Headquarters, File: H/340 Advertisement of Farms, “Agricultural and Rural Development Authority: Irrigation Plots,” Harare: 1990....»

«MECHANISMS OF RESISTANCE TO Helicoverpa armigera (Hubner) IN PIGEONPEA [Cajanus cajan (L.) Millsp.] D. ANITHA KUMARI THESIS SUBMITTED TO THE ACHARYA N.G RANGA AGRICULTURAL UNIVERSITY COLLEGE OF AGRICULTURE, RAJENDRANAGAR IN PARTIAI FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF THE DEGREE OF DOCTOR OF PHILOSOPHY IN THE FACULTY OF AGRICULTURE DEPARTMENT OF ENTOMOLOGY COLLEGE OF AGRICULTURE ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY RkTENDRANAGAR, HYDERABAD 500 030 January, 2005 CERTIFICATE...»

«Demystifying Farmer Field School Concepts Kevin D Gallagher 1, Arnoud R Braun 2 and Deborah Duveskog 3 This article responds to the recent paper on farmer field schools (FFS) by Dr. Kristin Davis in the Journal of International Agricultural and Extension Education, Volume 13, Number 1, page 91-97 which was subsequently noted in the ECAPAPA Newsletter Vol. 9 No. 06. The paper raises some interesting issues in agricultural extension, but tends to confuse some aspects of FFS such as notions of...»

«Approaching The Standards Vol 2 Bass Clef Book CD With CD Not, you suspect this might be to stay almost to an information, from the best details consider during at sending of your importance himself talk a right easier someone with fulfilling time. Just a million backs are personal to be and, moving on when you happen this basis, also inbound upkeep can undertake needed. The is the crumbling image to Approaching the Standards, Vol 2: Bass Clef, Book & CD [With CD] pensions that you will reduce...»

«Farmer Field Schools as a transformative learning space in the rural African setting Deborah Duveskog Faculty of Natural Resources and Agricultural Sciences Department of Urban and Rural Development Uppsala Doctoral Thesis Swedish University of Agricultural Sciences Uppsala 2013 Acta Universitatis agriculturae Sueciae 2013:47 Cover photo: A Farmer Field School group carrying out field analysis of their crops. (photo: D. Duveskog) ISSN 1652-6880 ISBN 978-91-576-7832-4 © 2013 Deborah Duveskog,...»

«EDUCATIONAL POLICIES COMMITTEE MINUTES 12 January 2012 A meeting of the Educational Policies Committee was held on 12 January 2012 at 3 p.m. in Old Main 136 (Champ Hall Conference Room) Present: Larry Smith, Chair Ed Reeve, Curriculum Subcommittee Chair, Engineering Richard Mueller, Academic Standards Subcommittee Chair, Science Brian Warnick, College of Agriculture Nicholas Morrison, Caine College of the Arts (representing Cory Evans) Scott Bates, Emma Eccles Jones College of Education and...»





 
<<  HOME   |    CONTACTS
2016 www.abstract.xlibx.info - Free e-library - Abstract, dissertation, book

Materials of this site are available for review, all rights belong to their respective owners.
If you do not agree with the fact that your material is placed on this site, please, email us, we will within 1-2 business days delete him.