ML20076J866
| ML20076J866 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/09/1978 |
| From: | Dunn B BABCOCK & WILCOX CO. |
| To: | Cudlin J BABCOCK & WILCOX CO. |
| References | |
| TASK-*, TASK-GB GPU-0617, GPU-617, NUDOCS 8307060531 | |
| Download: ML20076J866 (1) | |
Text
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e THE BABCCCK & WILCOX COMPANY h
POWER GENERATION GROUP To l
J.J. Cudlin, fechnical Staff g
(fj6dW Bert M. Dunn. Etnager. ECCS Analysis (2138) sos 442.s Cust.
File No.
or Ref.
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Date I
C'tArr2 Model Changes June 9.1978 l v u. i....
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The evaluation of the 6-foot auxiliary feedvater level control for the 205
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plants has shown unacceptable small break c=nsequences. If the results of r
this evaluation were to stand, Br'.i vould be forced to place a high auxiliary
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feedvater level control system into already =anufactured and shipped stema
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generators at a considerable expense to the company. Recent work ca 177
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plant s=all breaks has indicated favorable results associated with two model
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changes (1) the use of phase distribution =ultiplier vould account for distribution effects within the reactor vessel; and (2) the use of a ".aloudek j
discharge model for subcooled blevdown.
I In order to nake a maxi =um attempt at showing that high auxiliary feedvater levels are unnecessary you are' requested to combine the 177 model changes j
with the level dependent steam generator r.odel in a special C2ATT version.
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It is cry understanding this will amount to the combination of the CM l
version 8.3 code with the steam geesrator codel contained in a special ver-sion of CM version 8.2 on Tape #06730. I further understand that, with-
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out unknown co=plications, this work can be accomplished within the next two f
f weeks.
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cc:
M.I. Meerbaum
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l R.C. Jones t
D.H. Roy L
C.D. Morgan s
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Catherine Cook 6f-D#e Reporting, Inc. q[fg/g I
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