ML20024C733
| ML20024C733 | |
| Person / Time | |
|---|---|
| Site: | Crane, Bellefonte  |
| Issue date: | 02/28/1979 |
| From: | Patterson D TENNESSEE VALLEY AUTHORITY |
| To: | Mcfarland J BABCOCK & WILCOX CO. |
| References | |
| TASK-06, TASK-07, TASK-6, TASK-7, TASK-GB GPU-0476, GPU-476, NUDOCS 8307130176 | |
| Download: ML20024C733 (2) | |
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KNOXVILLE.TENHCsOEE L7902
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Co. erce Avenue w
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February 8,1979
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.c Babcock a'nd Wilcox Post Office Box 1260 24505 f-Lynchburg, Virginia 4
Mr. James McFarland Attention:
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L Gent 1' amen:
SELLEF0hT5 HUCLEAR PLANT UNITS 1 hMD 2
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NUCLEAR STEAM SUPPLY SY5ilms 4
C0tti?ACT 71C52-57.14-2 h
LETTER 60. K-2472 SPALL EREAX LOCA AM LYSI5 N4M-2 14(AO-iME3 790125 555) and
_'de ackn:wledge receipt of yccr let er No. 3-;*02 3
hava the 1:liewin; cc= ants.
ditional explahitien TVA will require the following clarification and e.d The and reference letter.
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to ccmpleta its review of the sub.iect ana ys sa folicwing statements:
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e will be con-.
g "After natural circulation ceases, the system pressurThat h
d threuch trolled by a 'velume balance.'
balance at a point where the volume of fluid disc arce 1.
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ted in the cere.
the break equals the volume of steam being creak increase l Fj;
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... the volume relief out the brea decreases with
.fi 2.
"The volume of steam being generated in the core system pressure.....
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increasing pressure."
h the requirement given in W small break 5tatements 2 and 3 appear to be inconsistent witY f
LOCA analysis as a conservajive prediction of m n mappe i~
statement 1.
Please
)i breaks smaller than 0.05 ftWe assume that statement 2 l
correct as written.
be in "thertial l1 clarify.
We were also wondering if you considered the system That is, the system pressure a
balance" as well as " volume balance."
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the core and the heat content balance at a point where the volume of fluid h deca 7yeat being created equals the volume of steam being creat s
h s the 3
volumetric steam flow ratio (final value/ n
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j7 in the core.
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'Babecek and Wilcox I
February 8, 1979 i
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prepertienal to the enthalpy and density ratios (
i flow with the range of interest, the net effect is a decrease in volumetr cTh Mcwever,.
the mass [ volume X density) of fluid c:nverted to steam is proport o increasina systen pressure.
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the enthalpy ratio only, which is increasing with in
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l r::2 :f 1::s of ry: tan inventory (massj.
It is this increasing inventory deplati:n ecupied with a decrea l
f:r T7A's r::a fr:a the HPI pump at elevated pressure that forms the basis I
this c:ncarn is t shew that a l
One way 1:r 31H to alievia:
" thermal balance does not have to pertain; c:herwise, it w uld app ccacern.
ceptablayb:ending the is.i small break L:CA analysis ety n:: he an aclier than C.05 ft'.
. predictor of minimum core level for breaks sma tha:
di TVA with an appropriate explanation for no i
ery Such a reply should resolve mest of cur remaining questiens c small break LOCA behavior..,
ld be Of course, concepts such as " volume balance" and "ther:a i l cases.
recognized as oversimplifications which may apply only to a i i les
(
The rigorous solution must be based on mass and energy c d phase changes applied to the entire system including all inputs, outputs, an i
within the system.
15, 1979.
Please give us your written response. by March l
Very truly yours, TENNESSEE VALLEY AUTHORITY 1
l D. R. Patterson, Chief Mechanical Engineering Branch 6
$E In triplicate Mr. J. L. Atchison cc:
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