PKL-tests, series IIB (end of blowdown). Vol. 3
Description
The latter stage of large break LOCA was simulated in the PKL test facility. Representative boundary conditions were achieved by preceding the refill and reflood phases with end-of-blowdown. The results confirming TRAC (Transient Reactor Analysis Code) calculations show that high steam velocity and hot leg injected accumulator water (p<26 bar) penetrates from the top into the core and triggers off quench fronts at both core ends. This is true of both cold-leg and hot-leg breaks. Heater rod temperature increase never amounted to more than 40 K, the turnaround time always coincided with the end of the refill phase, no temperature increase in the reflood phase was observed in tests with combined injection. The efficiency of combined injection was shown to be independent of the break location (hot or cold leg). All tests showed the large safety margins of the current KWU-PWR desing. With 3 refs., 4 tabs., 3 figs
Abstract (German)
Die Endphase eines Kuehlmittelverluststoerfalles mit grossem Leck wurde in der PKL-Anlage untersucht. Repraesentative Randbedingungen wurden erreicht durch das Vorschalten der End-of-Blowdown Phase (EOB) vor die Wiederauffuell- und Flutphase. Die Ergebnisse bestaetigen die TRAC-(Transient Reactor Analysis Code) Ergebnisse und zeigen, dass hohe Dampfgeschwindigkeit und das ab p<26 heissseitig eingespeiste Wasser durch die Stabhalteplatte in den Kern eindringt und an beiden Enden Quenchfronten ausloest. Das gilt sowohl fuer kaltseitige wie auch fuer heissseitige Brueche. Die Ergebnisse zeigen ferner, dass der Anstieg der Heizrohrtemperaturen nicht mehr als 40 K betragen hat; in den Versuchen mit kombinierter Einspeisung fiel die Turnaroundzeit mit dem Ende der Wiederauffuellphase zusammen. Die Wirksamkeit der kombinierten Einspeisung unabhaengig ist von der Bruchlage (heiss- oder kaltseitig). Alle Versuche zeigen grosse Sicherheitsreserven des KWU-DWR-Konzepts. With 3 refs., 4 tabs., 3 figs
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Additional details
Additional titles
- Subtitle (English)
- Test results. Final report
- Original title (German)
- PKL-Versuche, Testserie IIB (End of Blowdown). Bd. 3
- Original subtitle (German)
- Versuchsergebnisse. Abschlussbericht.
Publishing Information
- Imprint Pagination
- 316 p.
- Report number
- INIS-mf--10799
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 19018870
- Subject category
- S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
- Descriptors DEI
- BLOWDOWN; ECCS; ENERGY BALANCE; ENTRAINMENT; FLOW RATE; FLUID INJECTION; OSCILLATIONS; PRESSURE DEPENDENCE; PRIMARY COOLANT CIRCUITS; PWR TYPE REACTORS; REWETTING; SIMULATION; T CODES; TEMPERATURE MEASUREMENT; TRANSIENTS
- Descriptors DEC
- COMPUTER CODES; COOLING SYSTEMS; ENRICHED URANIUM REACTORS; POWER REACTORS; REACTOR COMPONENTS; REACTOR COOLING SYSTEMS; REACTOR PROTECTION SYSTEMS; REACTORS; THERMAL REACTORS; WATER COOLED REACTORS; WATER MODERATED REACTORS
Optional Information
- Contract/Grant/Project number
- Contract BMFT 1500 287/A0