Experimental investigation of the performance of pressurizer safety valves during single- and two-phase flow (ATWS)
- 1. Kraftwerk Union A.G., Erlangen (Germany, F.R.). Abt. Labor Komponenten-Pruefung
Description
Experimental investigation of the performance of pressurizer safety valves during single- and two-phase flow has shown that the overall pressurization system reliably prevents excess pressure in the primary system, not only under normal conditions, but also under ATWS conditions. A significant increase in reserve power for valve actuation has been achieved by slight structural modifications for all fluid flow conditions. The main safety valve will open and/or remain open even if the pilot safety valve is unstable in operation. Start-up tests performed by the NPP Grafenrheinfeld utility showed that the findings of these experiments are similar to behaviour under operational conditions. (orig.)
Availability note (English)
MF available from INIS under the Report Number.Abstract (German)
Experimentelle Untersuchungen zur Funktionstuechtigkeit der Druckhalter-Sicherheitsventile bei ein- und zweiphasiger Stroemung haben gezeigt, dass das gesamte Druckhaltesystem nicht nur bei normaler Beanspruchung, sondern auch im ATWS-Stoerfall eine Ueberschreitung des zulaessigen Druckes im Primaerkreis sicher verhindert. Die Strellkraftreserve konnte bei allen Fluidzustaenden durch geringe konstruktive Aenderungen signifikant erhoeht werden. Das Hauptsicherheits-Ventil bleibt selbst dann offen bzw. wuerde oeffnen, wenn das Vorsteuer-Sicherheitsventil instabil arbeitet. Vergleiche mit KKG/BAG-IBS-Versuchen zeigen, dass die Aussagen bezueglich des Funktionsverhaltens sehr betriebsnah sind. (orig.)
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Additional details
Additional titles
- Subtitle (English)
- Final report
- Original title (German)
- Experimentelle Untersuchungen zur Funktionstuechtigkeit der Druckhalter-Sicherheitsventile bei ein- und zweiphasiger Durchstroemung (ATWS)
- Original subtitle (German)
- Abschlussbericht.
Publishing Information
- Imprint Pagination
- 182 p.
- Report number
- INIS-mf--8872
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 15049927
- Subject category
- S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
- Descriptors DEI
- ATWS; OPERATION; PRESSURIZERS; PWR TYPE REACTORS; REACTOR SAFETY EXPERIMENTS; SAFETY ENGINEERING; VALVES
- Descriptors DEC
- ACCIDENTS; CONTROL EQUIPMENT; DESIGN BASIS ACCIDENTS; EQUIPMENT; FLOW REGULATORS; REACTOR ACCIDENTS; REACTORS; WATER COOLED REACTORS; WATER MODERATED REACTORS
Optional Information
- Contract/Grant/Project number
- Contract BMFT 150494