Tenders/Reduction of pressure during hydrostatic strength tests (HT) of the 1st and 2nd circuit

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Reduction of pressure during hydrostatic strength tests (HT) of the 1st and 2nd circuit

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Original title: Намаляване на налягането при хидроизпитания (ХИ) на якост на І-ви и ІI-ри контур

АЕЦ КОЗЛОДУЙ ЕАД

Published: Oct 30, 2026

Updated: Nov 2, 2026

Source: TED - Tenders Electronic Daily (EU)

About This Opportunity

This is a services contract in the mining and extractives sector, with a focus on Mining Operations. Located in Bulgaria, Europe, this opportunity is open to firms and consortiums.

Published through TED - Tenders Electronic Daily (EU), a national government procurement portal. Public procurement tenders follow the country's national bidding regulations and may have specific eligibility and documentation requirements for services in the mining and extractives sector. Service contracts are typically evaluated on both technical quality and price, and may require bidders to demonstrate relevant experience and qualified personnel. Interested parties should review the full documentation on the original source before submitting their proposal.

Description

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Reduction of pressure during hydrostatic strength tests (HT) of the 1st and 2nd circuit. For the implementation of the public procurement, it is necessary to analyze the possibility and justify the reduction of pressure during hydrostatic strength tests (HT) of equipment and pipelines of the 1st and 2nd circuit of units 5 and 6 of Kozloduy NPP EAD, based on a methodology developed by the Contractor. The scope of the analysis must include at least the following pipelines and equipment: • reactor vessel (5,6YC10) with nozzles; • upper reactor block (5,6YC20); • main reactor seal (main connector); • pressure compensator (5,6YP10B01); • spiral chamber ("volute") of main circulation pumps (MCP) (5,6YD10,20,30,40D01); • steam generator (SG) first circuit collectors; • SG heat exchange tubes; • main circulation pipelines (5,6YA10,20,30,40); • pressure compensation system pipelines (5,6YP); • pipelines of the passive part of the emergency core cooling system (ECCS) on the 1st circuit side (5,6YT-1, 5,6YT-2, 5,6YT-3, 5,6YT-4); • SG vessel (5,6YB10,20,30,40W01); • SG steam collector; • SG feedwater collector; • vessels of fast-acting shut-off valves (FASOV) (5,6TX50,60,70,80S06); • SG safety valve (SV) vessels (5,6TX50,60,70,80S03,04); • vessels of fast-acting steam dump reducing units (FASDRU) (5,6TX50,60,70,80S05); • high-pressure steam pipelines in the containment (5,6TX50-2-ro, 5,6TX60-2-ro, 5,6TX70-2-ro, 5,6TX80-2-ro); • feedwater pipelines in the containment (5,6TX41-1-ro, 5,6TX42-1-ro, 5,6TX43-1-ro, 5,6TX44-1-ro); • emergency feedwater pipelines in the containment (5,6TX-11-1, 5,6TX-12-1, 5,6TX-13-1, 5,6TX-14-1). The possibility of reducing the pressure of the HT strength tests of the 1st and 2nd circuit should be assessed through deterministic and probabilistic analyses, based on ensuring the reliability criterion (or another justified approach) for the equipment and pipelines. The scope and requirements for the execution of the public procurement are detailed in Technical Specification No. 24.EP-2.TЗ.1457.

Data provenance

This notice is sourced from TED - Tenders Electronic Daily (EU) and was originally published on October 30, 2026. Last refreshed today. Original language: bg. BidsFactory mirrors official procurement notices and links back to the source for full legal text.

About АЕЦ КОЗЛОДУЙ ЕАД

АЕЦ КОЗЛОДУЙ ЕАД has issued 118 procurement notices on BidsFactory, including 12 currently open and 72 awarded contracts. Activity concentrates in Industry & Manufacturing, Architecture & Engineering Services, and Research & Innovation. All notices are published for Bulgaria. Notices are distributed via TED - Tenders Electronic Daily (EU). Most recent publication: October 30, 2026.

Frequently asked questions about this tender

Where will the contract be performed?

The contract is for delivery in Bulgaria. Foreign bidders should review local registration, taxation, and any in-country presence requirements before submitting.

How can I submit a bid?

Visit TED - Tenders Electronic Daily (EU) to access the full notice, required documents, and submission instructions provided by the contracting authority.

Who is the contracting authority?

This notice was issued by АЕЦ КОЗЛОДУЙ ЕАД in Bulgaria. The authority is responsible for evaluating bids, awarding the contract, and managing performance.

What type of contract is this?

This is a Services contract in the Mining & Extractives sector. The classification helps bidders match the opportunity to their qualifications and registered scope of supply.