ANALYSIS OF THE DEFECTIVENESS OF THE WELDS OF №111 PGV 1000 AND PROPOSAL ON THEIR ELIMINATION

UDC: 
621.039

Issue of journal:

Author(s):

Abstract: 

Reliability of planned and exploiting complex technical objects, such as AES – main
condition of safety for the man and the environment. The basic factors, which influence
reliability are:
– absence of errors in design and calculation of constructions, the correctness of
the selection of materials and technology of production;
– quality of the materials used;
– quality of assembly and welding works;
– operating condition and operational control.
Despite the fact that with the design and the operation AES, clout is given to the
guarantee of reliability, operating experience showed that in the welded joint of №111
PGV1000M is possible crack formation. The mechanism of origin and increase in the
cracks, until now, is not unambiguously determined.
In the article are represented the results of investigating the reasons for the damage
of metal in the zone of the welded joint of № of 111 weldings of hot collector to the
branch pipe Of du1200 of housing. The first case of the splitting of metal in the region
of the connection of collector with the housing PG occurred in 1998 on 5 block
Novovoronezh atomic station. Subsequently are discovered uniform damages even on
several PG, which made it necessary to consider the cases of damage as the system
problem, which has the general reasons.
To identify factors that lead to cracking, conducted a significant amount of R & d:
analysis of the manufacture and properties of the metal; a detailed computational study
of the stress state from operational factors; assessment of residual stresses from
manufacturing techniques; experimental study of the stress state of the node models
and the NPP; measurements and the analysis of the displacements of equipment RU with
the thermal expansion; the determination of the critical dimension of cracks; the
correction working of the working medium of secondary circuit; the exception of the
thermoshocks, connected with the work of the system of scavenging.

References: 
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