{"id":25435,"date":"2025-02-06T08:29:41","date_gmt":"2025-02-06T07:29:41","guid":{"rendered":"https:\/\/www.enseco.sk\/?p=25435"},"modified":"2025-10-23T10:21:08","modified_gmt":"2025-10-23T08:21:08","slug":"cold-hydro-test-at-unit-4","status":"publish","type":"post","link":"https:\/\/www.enseco.sk\/en\/cold-hydro-test-at-unit-4\/","title":{"rendered":"Cold Hydro at Unit 4"},"content":{"rendered":"\t\t
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Together with the investor and other Contractors, we made yet another important step towards completing Unit 4 at the Mochovce Nuclear Power Plant. Between December 2, 2024, and January 1, 2025, we conducted the first hydraulic test, the so-called \u201eCold hydro\u201d<\/strong>, per the 4P201 test programme.<\/p>

What is a Cold Hydro test?<\/strong><\/p>

The test primarily consists of a pressure leak test and circulation flushing of the primary circuit, a pressure strength test of the steam generators’ secondary side, and related functional tests of critical components of the primary circuit, including:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tPressurized water reactor;<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tSteam generators;<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tMain circulation piping;<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tMain circulation pumps with auxiliary systems, and <\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tPressurizer system. <\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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    Difference between Cold and Hot Hydro<\/strong><\/p>

    The Cold hydro test<\/strong> is the first comprehensive step in the non-active tests phase (without fuel), whereby all the primary circuit\u2019s main systems are operational. The reactor is only partially assembled, meaning it does not contain fuel rods or their mock-ups. A throttling plate simulates the hydraulic resistance of the reactor. The reactor lid is only provisional, without control rod actuators. <\/span><\/p>

    During a cold hydro, the temperature of the primary circuit oscillates between 110<\/strong> \u00f7 135\u00b0C<\/strong>. The pressure reaches a nominal value of 12.26 MPa<\/strong> (with a short-term exception of the pressure leak test, when it is raised to 13.7 MPa<\/strong>). \u00a0<\/p>

    The scope of tests is minimized only to enable the operation of the basic systems involved. Throughout the entire process, the chemical regime of a primary circuit coolant is being monitored. \u00a0A prerequisite for completing cold hydro is to achieve a required cleanliness level of internal surfaces.<\/p>

    During the <\/span>hot hydro, <\/strong>the parameters in the primary circuit get closer to the nominal values. The temperature is nearing <\/span>260\u00b0C<\/strong>, and the pressure is <\/span>12.26 MPa<\/strong>. As part of hot hydro, a pressure strength test will be conducted on the primary circuit, including the integral parts of the primary circuit loops and the reactor, at a pressure of 19.12 MPa<\/strong>. The entire set of tests is carried out, focused on verifying the smooth cooperation of the primary and partially secondary circuit systems under the standard operation regimes, during the fallout of essential systems or equipment, and under specific emergency conditions.<\/span><\/p>

    Cold Hydro Objectives<\/strong><\/p>

    The systems (equipment, valves, and piping of the primary circuit) undergo a pressure leak strength test at 13.7 MPa<\/strong> and a temperature of 110 \u00f7 135 \u00b0C<\/strong> for 60 minutes.<\/strong> The internal surfaces of equipment and piping are then cleaned to the required level through circulation flushing until the water in the primary circuit achieves the prescribed quality. Additionally, functional tests of individual equipment are performed in a limited scope and with reduced temperature and pressure parameters.<\/p>

    In addition to the primary circuit, functional tests associated with the secondary circuit’s pressure test and the preservation solution’s replacement are also carried out.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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    ENSECO Equipment Scope:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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    • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tVolume control system and coolant discharge system<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
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    • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tHydrogen recombiner<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
    • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tContinuous coolant purification system<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
    • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tControlled leaks from the primary circuit<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
    • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tSteam generator blowdown and drain<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
    • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tContaminated condensate tanks and pumps<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
    • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tBorated water makeup system<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
    • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tChemical solutions preparation and makeup system<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
    • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tHigh-pressure safety injection system<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
    • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tPassive safety systems and low-pressure safety injection system<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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      What’s up next?<\/strong><\/p>

      Once the cold hydro is finished, all essential systems and components of the primary circuit are checked by a so-called \u201cSmall revision.\u201d The mock-ups of fuel and control rods are loaded in the reactor, which is closed off by a standard lid containing the control rod actuators.<\/p>

      A hot hydro will be performed, after the successful completion of which the systems of the nuclear unit will be ready for fuel loading and the transition to the so-called \u201cActive tests\u201c.<\/p>

      These steps will also require the same quality of management and a high level of cooperation between Slovensk\u00e9 Elektr\u00e1rne and other contractors, as demonstrated during the successful completion of this cold hydro test. We thank everyone involved and continue with the commissioning activities.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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      \n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\tLinkedIn\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

      Together with the investor and other Contractors, we made yet another important step towards completing Unit 4 at the Mochovce Nuclear Power Plant. We have completed so called Cold Hydro Test per 4P201 test programme.<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[9],"tags":[],"class_list":["post-25435","post","type-post","status-publish","format-standard","hentry","category-news"],"acf":[],"yoast_head":"\nCold Hydro at Unit 4 | ENSECO<\/title>\n<meta name=\"description\" content=\"We made another important step towards completing Unit 4 at the Mochovce Nuclear Power Plant. The so-called "Cold Hydro" has been successfully conducted.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.enseco.sk\/en\/cold-hydro-test-at-unit-4\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cold Hydro at Unit 4 | ENSECO\" \/>\n<meta property=\"og:description\" content=\"We made another important step towards completing Unit 4 at the Mochovce Nuclear Power Plant. 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