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(1)

CHOOSE EXPERTS, FIND PARTNERS

MODELLING THE AUXILIARY BUILDING OF BELGIAN

NUCLEAR POWER PLANTS IN MELCOR 1.8.6

EMUG 2015 - Brussels

(2)

• Presentation of the automated tool

– Purpose – Methodology – Offline demo

• Conclusions

(3)

• Presentation of the automated tool

– Purpose – Methodology – Offline demo

• Conclusions

TABLE OF CONTENTS

(4)

• Requested:

– Modelling of the auxiliary building of all the nuclear power plants in Belgium

• Large data input

– Manageable with an automated tool

– Automatic reduction of the number of CVs, FLs and HSs

PURPOSE OF THE MATLAB SCRIPT

(5)

• The starting point for the automated tool

– A database (rooms, connections, walls and ventilation lines) resulting from Fire Hazard Analysis projects and walk downs (performed by Tractebel Engineering) is used

• The input for the automated tool

– Mass/energy source arrival

• 1) Creation of blocks

• 2) Grouping method to reduce number of rooms

• 3) Addition of the ventilation and design leakage to the model

• The output of the automated tool

– Melcor User Input File

METHODOLOGY

(6)

• Exact model of an auxiliary building (Tihange 1)

– 218 rooms, 602 flow paths and 1032 heat structures

• Initial situation of the demo:

– 16 rooms, 19 flow paths and 96 heat structures – Three arrivals of mass/energy

OFF LINE DEMO

(7)

• Step 1: grouping in blocks

– A block is started by a room with an arrival of mass/energy – One block is a set of rooms which are all connected

– No interconnection between the blocks

OFF LINE DEMO

(8)

• Step 2: grouping according to connection ratio

– The user defines the final number of control volumes (5 for example) – Grouping based on a connection ratio:

volume of the connection

biggest room volume of the connecting rooms

– 13 connections; 13 connection ratios

– Start grouping with the biggest connection ratio (13 CV to 12 CV) – Continue grouping until the user defined CV number is reached

OFF LINE DEMO

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• Step 2: grouping according to connection ratio

OFF LINE DEMO

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• Step 2: grouping according to connection ratio

– Note that a decision has to be made at this point:

• Grouping in one flow path, loss of accuracy, increase in simplification

• Not grouping in one flow path, increase in accuracy, decrease in simplification

OFF LINE DEMO

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• Step 3: Extend the model with ventilation

– Data resulting from the databases and plant specifications

– Same methodology used as before, addition of the ventilation flow paths

OFF LINE DEMO

(12)

• Step 3: Extend the model with design leakages

– Design leakage between AB and AS

– Design leakage between AB and environment.

OFF LINE DEMO

(13)

• Off line demo

• Conclusions

TABLE OF CONTENTS

(14)

• The auxiliary building of the nuclear power plants in Belgian has been modelled

• The user defined control volumes can be changed instantaneously

• The databases are checked for inconsistencies

– Flow path height not consistent with From/To room elevation

• Whenever there is an update of the database

– Auxiliary building model is generated instantaneously

• Consistencies in the modelling of all auxiliary buildings

CONCLUSION

(15)

• There is a need for engineering judgment

– The number of rooms

– The number of connections

• Every decision is supported by the automated tool

CONCLUSION

Referenzen

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