ML19316A487
| ML19316A487 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 05/12/1970 |
| From: | Norian P US ATOMIC ENERGY COMMISSION (AEC) |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 7912200741 | |
| Download: ML19316A487 (6) | |
Text
{{#Wiki_filter:' <[3- 0d9 (SF 3 20 N 12 W I FILLS THRU: Raycond J. Impara, Chief, Systems Analysis B.anch, DRS RELAP3 PRELE!INARY XfALYSIS OF CUi2 REACT 0k Introduction The RELA?3 conputer progrm was recently made operational on the I3M 360/50 computer. This code provides a multi-node (up o 20) r2 presentation.sf the primary coolant system, rather than only three nedes in previous codes such as RELAP2 and FLASH-1. This =emo presents the preliminary results of the primary system fluid behavior for postulated hot and cold leg breaks for the Duke reactor. Discussion / A sixteen node model r>f the Cuka reactor was used for the RELA?3 calculations dise.ussed in this memo. A diagram of the model and ~N nuch of the necessary control volume and junction.ata are given in the memo to Files from P. E. Norian, " Trip Report - Idaho ;iuclear Corporation," dated F. arch 27,,,1970. This model was used to an9 yze 1 both a hot leg break (14.1 f t'), and a cold les break (7.34 f t'). The attached figurcs present p.1.ots of junction flow and pressure for the hot leg break (Figures 1 and 2) and the cold leg break (Figures 3 and 4). The Duke FSAR presents an analysis of various hot leg breaks, ' ut does o not include any cold leg breaks. The i.; uke results for core flow (FSAR-Figure 14-33) and average pressure (FSAR-Figure 14-44) are also plotted on Figures 1 and 2. These results were obtained with the FLASH-1 code, although Babcock and tiilcox currently has an operaticnal multi-node code (FLAS~-2). The following observations can La =ade d about the attached figures : 791220014\\ OFFICE > l $URNAME> DATE >... Form AEC.318 (Rev. 3-53) d.$. GOVERNMENT M!NTtWCFFICE 131 -O-364-595
M MAY 1 2 2 FILES 1. The =ulti-node PILAP3 code predicts a longer blowdown time and higher system pressure during blowdown than the FLASH-1 code. 2. The core flow rate during blowdown is considerably lower with the RELAP3 code. 3. The.ULAP3 code predicts core flow reversals during biovdown for both the hot and cold leg breaks. The RELAP3 results are similar to tr ose predicted b,r the Westinghouse multi-node SATAd code for large PWR s.. These codes indicate a very low pressure drop (about 1 psi) across the core during blevdown. This phenomenon su;; gests potantial lov flow and phase separation in the core region of all PWRs that may result la more severe cladding temperature transicats than previously analyzed. Recommendation It is recommended that the applicant provide an analysis of both hot and cold leg breaks using a multi-node representation of the primary system. This analysis should consider the ef fect on the cladding temperature transit resulting frcm increased blowdown time and decreased core flow. Paul E. Jorian [". /,' C Y k' Sysrets Analysis Branch A~ Division of Reactor Standards cc: E. G. Case,.)RS P. A..%rris, D2L R. C. DeYoung, DRL R. S. Soyd, CRL C. G. Long, DRL M. Rosen, DRS L. Ioop, DRS C. L. Allen, DRS G. N. Lauben, DRS
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