ML19221A639
| ML19221A639 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/21/1979 |
| From: | Levy S INDUSTRY ADVISORY GROUP |
| To: | |
| References | |
| OSC-790421, TASK 29, TASK-29, NUDOCS 7905230493 | |
| Download: ML19221A639 (5) | |
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a TASA CLOSE OUT COCUV.ENT O
Task Sccpe
$AT()fAL Ci2Cl)(ATtell - 1)EGRAf>ED 1CPE LEbMETRV -C/lLIVA7iov EF TEM PBAT0leJ To:
M. Levenson
- 5. Levy E. Zebroski Task No.
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'h NATURAL CIRCULATI0tt/ DEGRADED CGRE EXPERIENT OBJECTIVE: To ascertain the efficiency of cooling by free convection within degraced core.
ASSUNPTION: (1) Fuel has collected in layers over central core region at grid spacer elevations. (15 inches apart)
-3 (2) Heat generation rate of 1.5x10 of nominal full power (2732 MW).
(3) Total blockage of central core region (annular bypass of scaled dimnsions) a)
3/4 blockage b) 7/8 blockage 3
SOLUTION:
(1) Use Volu:re Scaling (i.e.
G/ft water)
,(2) Q 4.1 PJ
=
gg Olayer 450 W (9 layers)
Target TMI
=
Olayer 6.3 G
=
y Laye r ft Test Vessel I.D.
- 9 inches Yest Pressure
= Atmospheric Plata to Wall Gap
= 0.300 in. (3/4 Blocked)
Plate to Vall Gap
= 0.150 in. (7/8 blocked)
Test Nodci Target Test tbdel Q
= 0.23 W/ layer Spacing between layers 1.25 inches
=
)
Olayer 0.21 W/ layer
=
1 Q
0.40 G/ layer Achieved
=
layer Q,,,,
0.67 G/Tayer j
=
3 RESULTS:
(1)
Boiling not cbservad anywhen: 6Jring free convection.
(2)
Threshold of local boilirg (tcp layer) only observed when inlet flow reduced by use of valve.
Q (3) See Figure attached for actual results.
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rj Frse Consection Best T..f er Calculsticas
, Eh Throty;b "Forous" Wd1a A.
Calculate foar. cases:
1.
System pressure = 900 pai Inlet temperature = 2SO F and 350 F 2.
Syste:a precaure la atmospheric Inlet tenperature = 170 F and 200 F Asse=ctions:
1.
Pcver 2 0.2% of 25002W 2 1s 6
2.
Core divided into 8 reglens defined by spAccrS.
3.
Region with porous nadiun hns h acer of 105 in.
4.
Foreur =edium is defined by cylinders of
.4" diar.cter spaced with a pitch to dim-eter ratio of 1.065 in a staggered grid. This gives a Po:osity of 20%. For heat transfer area the ends of the cylinders are ignored.
5.
Assuse 3 " trays" cf porous r.aterial, in following geocetry.
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+
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NY T.
9,e IP i"
166 117 i
Results:
2 1.
The heat transfer rate required in the porous mediun is 306 23/hr f t to r
carry away the hast g en era t ed.
(If a te:nperature dif f erence cf 100 F ic
IC; M.l.ao m a V
n
~
Fage M fr9 ** *. \\,5).I=OC O #
te b
..?
5 nesulta (cont.)
jt asatred betvaca tha fluid and the surface, the hest transfer coefficient required is'about 3 BTU /hfr~ft which is typical of fres cer:vecti:n in air.)
2.
At a pressure of 900 pai free ccavection provides = ore than enough flev n
at inlet tempsratures of 2C0 F and 353 F to prevent the vstar fros reaching saturation. The heat transfer coefficiant is of order 250 BTU /br ft*#F and the te=perature rise approximately 1 F.
3.
At atscepheric pressure with inlet te=perature of 170 F cr higher, f ree convectica does not provide enough ficw to allev vator to re=ain sub-cooled. Hence local boiling vill result.
4.
Calculations using CEF correlations for beds consisting of 300 to 800 nicrou particles show that at at=cepheric conditions CH? vill pro-O bably be reached. Ecvever, due to the low pecer generation the ts=perature rise vill not be significant.
?
t 166 118 A