ML19221A362
| ML19221A362 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/21/1979 |
| From: | Loewestein W INDUSTRY ADVISORY GROUP |
| To: | |
| References | |
| OSP-790421, TASK 29, TASK-29, NUDOCS 7905220052 | |
| Download: ML19221A362 (5) | |
Text
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1 m. [. -- - - [ y o,, l G.., \\hL:we.~d%', AATURAL CIRCULATION / DEGRADED CORE EXPERIMENT i.. OBJECTIVE: To ascertain the efficiency of cooling by free convectior. within degraded core. ASSUMPTION: (1) Fuel has collected in layers over central core region at grid spacer elevations. (15 inches apart) -3 (2) Heat generation rate of 1.Ex10 of nomiral full pcwer (2732f-V). (3) Total blockage of central ccre region (anr.ular bypass of scaled dim nsicns) a) 3/4 blockage b) 7/8 blockage SOLUTICN: (1) Use Volume Scaling (i.e. G/ft watsr) (2) Q 4.1.SI = g O 450 G (9 layers) Target Ti4I layer = 0Laye r g,3 g [ = Layer ft ) Test Vessel 1.D. - 9 inches Test Pressure = At:cspheric I l Plate to Wall Gap = 0.3% in. (2./4 Blo: Led) Fiate to Wall Gap = 0.150 in. (7/8 blocked) Test Fodal Target Test.5briel Q = 0.23 W/ layer 1: Specing between layers = 1.25 inches Y ~ O D 0.21 G/ layer layer = i. 0.40 G/ layer / Achieved h 0 = layer i o Q 0.67 G/ layer er j 1 RESULTS: (1) Eoiling not observed anywhere during free convecticm. (2) Threshold of local boilireg (top layer) only cbserved een inlet flow reduced by use of valve. (3) See Figure attached for actual results. ~ D\\ -=
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~ { 'Q s. N e. N Q 'MCW ' b~. ~$^* A. [~" pggo {W N MW' N = ~ Pree Cc vaction Ee2t Trc af er CsIculc;icas r .Throug.h "Torocs" Mediz A. Calculeta four. ceses: 1. Eystem pressure = 900 psi Inlet te. perature = 250 F and 350"Y 2. Systcc pressere is at ncepheric Irlet te=pereture = 170 F and 200 F is s t=p ti ens : 1. Po-tr % 0.2% of 25001G1 N MSI ~ .T ~ 2. Core divided into 8 regions defined by spaccre. 3 Region with porces =ediu: h s <'i-ater of 105 in. 4. Forous cedic is defined by cylinders of .4" diz-a ter spr.ced wi-J c pitch to dir.=eter ratio of 1.055 in a staggered grid. T'.-J.s gives a pcrosity of 20%. For heat transfer area the ends of the cylinders ar e ignered. 5. Ass =e 3 " trays" of porous =st erial, in fc1W.: g ec c.,e t ry. k IQS
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1 ~ lf////// /// / $ Te20 l _ ... + _ 3 t pnin m * - ^ ~by-r-r ; u,;- l$ 4~ ' _t%V ? 3 U l Ecsults: 1. The heat transfer rate required in the porous cediu: in }06 BTU /hr f t to carry sway the best generated. (If a te=perature difference of 100 F is \\
- A.,w M ID* M. d. # V A, p % c - - - ~ i '~ ~. 44 g J). EaBe TA EWW, Ys C k n'p se % 2' r T.enles (co=t.):- assured betvses the firid asd the surf ace, the heat tre=sf er coef ficient 2 re,cired is a5 cut 3 BTU /hr ft which is typica.1 of free convection in r air.) 2. At a pressure of 900 psi free convaction provides scre cham enough flov n . at inlet te=peratures of 2SO F and 350 F to preve_nt the w tar fr:s reaching saturatics. Tce beat transfer coefficient is of crder io 250 BTUfar ft F and the tenperature rise approxinately 1 T. O 3. At st=2 spheric precsure with inlet te=perature of 170 F cr higher, fres c nvectics does not provide enough flov to allev vatar to emin sub-cocied. Hence local boiling vill reacle. 4. Calculationa using CEF correlctions for beds consistic; cf 300 to 500 micrrn rticles sh v that at :tnespheric conditions CEF vill pro-brbly be reached. Ecmcr, due to the lov pecer generatico the temperature rise vill not be significz=t. e 4 -}}