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Design for replacement of hydraulic shock absorber 5 TQ40J01


  • Employer:
    Kozloduy NPP EAD
  • Implementation period:
    March 2020 – july 2020
NPP Kozloduy


The program for lifetime extension up to 60 years at 104% nominal power capacity of Unit 5 of Kozloduy NPP calls for additional reinforcement against eventual seismic impact of the pipelines for emergency boron solution injection into the reactor pressure vessel. As a result, it is necessary to develop a detailed design for the replacement of hydraulic shock absorber 5TQ40JOI with a component with greater allowable load bearing (no less than 250kN).

Scope of the project

The scope of the project includes the development of a detailed design (in accordance with Bulgarian investment design legislation and applicable codes and standards), comprised of the following design parts:

  • Structural;
  • Machinery and Technology;
  • I&C and automation;
  • Fire Safety;
  • Health and Safety Plan;
  • Radiation Protection;
  • Update of Safety Assessment Report.


The design was developed, submitted and accepted by the Employer.