Analysis of wall heat capacity effects on core makup tank drain-down behavior in ROSA/AP600 experiments
- Japan Atomic Energy Research Institute, Ibaraki (Japan); and others
The thermal-hydraulic behavior of the core makeup tank (CMT) during scaled integral experiments on the Westinghouse AP600 reactor design was analyzed using the RELAP5/Mod3 (version 5M5) code. The natural circulation rate through the CMT was predicted well, although the prediction of the thermal stratification in the CMT had a problem due to inability to predict multidimensional mixing in the CMT upper regions. The over-scaled CMT metal mass in the experimental facility affected the CMT drain-down behavior in two experiments: (i) a multiple-failure experiment where the system depressurization became extremely slow due to the simulated failure of the ADS valves; and (ii) a relatively-large break experiment where the CMT started draining before thermal stratification developed in the CMT water inventory. In both experiments, the CMT wall became a heat sink and was a large steam condensation site. This had a effect to limit the CMT drain rate. 6 refs., 15 figs.
- OSTI ID:
- 549088
- Report Number(s):
- CONF-970607-Vol.1; TRN: 98:000363
- Resource Relation:
- Conference: ARS `97: American Nuclear Society (ANS) international meeting on advanced reactors safety, Orlando, FL (United States), 1-5 Jun 1997; Other Information: PBD: 1997; Related Information: Is Part Of Proceedings of the international topical meeting on advanced reactors safety: Volume 1; PB: 640 p.
- Country of Publication:
- United States
- Language:
- English
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