Sludge removal is performed on two steam generators (SG’s) at the Krško Nuclear Power
Plant (NEK) during every outage. SG’s are a meeting point of four major plant systems: Reactor
Coolant System ...(RC) on the primary side and three systems on the secondary side – Auxiliary
Feedwater System (AF), Main Feedwater System (FW) and Main Steam System (MS).
Sludge removal activities take place on the secondary side of the SG’s on the top of the tube
sheet. It consists of classical Sludge Lancing (SL) which is done by spraying water at different
angles (30°, 90°, 150°) between the tube gaps in the steam generator tube bundle with a pressure
around 220 bars. Another method is Inner Bundle Lancing (IBL) which means spraying water at a
much higher pressure (NEK’s contractor reached a pressure of approximately 590 bars). Such water
is sprayed directly on the top of the tube sheet with a robot guided lance which is placed inside a
steam generator. The robot is controlled by an operator and at times fully autonomous to provide
the highest protection measures possible. After these activities, a televisual inspection (TVI) of the
top of the tube sheet is performed to access the hard sludge area and to search for potential foreign
objects in the SG’s. If an object is found, an attempt to retrieve it would usually take place. Other
methods of sludge removal as upper bundle flushing or chemical cleaning have not been
implemented in NEK thus far.
Since the power plant uprate in May 2000, NEK conducted SL on both SG’s every outage
with IBL in 2013 and 2015 and the same method was used in the 2018 outage. The purpose of these
activities is mainly to extend the full load operation of the plant, prevent denting processes in the
SG’s from occurring, stop the buildup of hard sludge area to increase/sustain efficiency and remove
foreign objects found in the SG’s.
SG’s U-tubes are a barrier between the primary side coolant and the secondary side of NEK
and the environment. Therefore, it is crucial to keep the highest level of integrity of the U-tubes
because any leak could potentially mean a release of radioactive material to the atmosphere.
This paper describes the purpose and workflow of sludge removal in NEK.
Provider: - Institution: - Data provided by Europeana Collections- Extended description:
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Krško: spremljajoči dogodki ob kongresu ZSMS; stojnice mirovnikov, ekologov, kluba Lilit, ki se zavzema za enakopravnost žensk, pogovor z mladimi, prečrtani badge s členom 133.
Mladen Petretič, izjava o družbenih gibanjih, ki nasprotujejo represivnim metodam reševanja nasprotij v družbi. Marko Hren, mirovnik, o iniciativah mirovnikov in kulturi miru, peticija v podporo človekovim pravicam. Mojca Dobnikar o služenju vojaškega roka za ženske in enakopravnosti. Predstavnik ekološkega mladinskega gibanja v Sloveniji.- Information:- Environmentalists and pacifists’ stands at the Socialist Youth Association of the Slovenia Congress- Original language summary:
Stojnice ekologov in mirovnikov na kongresu Zveze socialistične mladine- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Polazeći od Programa razgradnje NE Krško, ovaj tekst analizira potrebna hrvatska izdvajanja za troškove razgradnje u odnosu na cijenu električne energije iz te elektrane. Raspravlja se o pouzdanosti ...procjena Programa, a napose pretpostavljenih financijskih parametara. Radi toga je provedeno variranje diskontne stope u uobičajenom rasponu od 1 % do 5 %, kao i modela jednakih i rastućih anuiteta. Analiziraju se i hipotetički scenariji duljeg prikupljanja sredstava, jedan sličan slovenskom slučaju (opisuje što bi bilo da smo ranije počeli), dok drugi scenarij analizira moguće produljenje radnog vijeka elektrane.
Posebno je raspravljen odnos financiranja kakvo preporuča Program i mjera koje su do sada poduzete za ostvarivanje tih preporuka u Hrvatskoj.
Provider: - Institution: - Data provided by Europeana Collections- Fotografija kapucinskega samostana v Krškem pred obnovo v 80. letih 20. stoletja. - All metadata published by Europeana are ...available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- Fotografija kapucinskega samostana v Krškem pred obnovo v 80. letih 20. stoletja. - All metadata published by Europeana are ...available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- Stavba kapucinskega samostana v Krškem, kjer ima od leta 1988 svoje prostore Valvasorjeva knjižnica Krško. - All metadata published ...by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- Ohranjeni rokopisni zvezek v knjižnici kapucinskega samostana v Krškem. - All metadata published by Europeana are available free of ...restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- Uvodna barvana ilustracija v rokopisnem zvezku.- All metadata published by Europeana are available free of restriction under the ...Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- S knjižnih polic izločeni in za predstavitev pripravljeni knjižni zakladi kapucinske knjižnice Krško. - All metadata published by ...Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
Provider: - Institution: - Data provided by Europeana Collections- Pogled na stavbo kapucinskega samostana v Krškem iz JZ smeri. Nekdaj izzidana kaminska kuhinja je danes glavni vhod v Valvasorjevo ...knjižnico Krško. - All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana
