ML19340D623
| ML19340D623 | |
| Person / Time | |
|---|---|
| Issue date: | 12/04/1980 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Taylor J BABCOCK & WILCOX CO. |
| References | |
| NUDOCS 8012310496 | |
| Download: ML19340D623 (4) | |
Text
.
1 m
j DEC i 1980 R
'q M:, = -
-=-
C3
= q,C u.3 Mr. J. H. Tay?Jr. Manager y
)]h' Licensing s
5 1
Sabcock & Vticox C
u 3*
P. O. Bo.: 1260 Lynchkrg, Virginia 24502
Dear W. Taylor:
Subject Request Number 1 for Mditional Information on BAW-10120 and BAW-10130 We are currently reviewing Babcock and W11com Ticensing topicaT report numbers BAW-10129 and BAW-10130 respectively, entitled " LYNX 1. Reactor Fuel Asssably Thensal Hydraulic Analysis Code' and "LYMX 2. Subchannel Thc. si ;:;-fraulic Analysis Progres".
The initial reviews reveal the need for the additional information indicated in the enclosure.
This infermation is necessary to complete the review - its expeditious submittal will therefore be to Babcock and Wilcox advantage. Receipt of the information by December 15, 1980 will enhance the review continuity.
l SfacereTy, I
w;6.nl signed by Robert L. Tedaco Robert L. Tedesco, Assistant Director for Licensing Division of Licensing cc: Mr. R. 8. Borsam Babcock & W11cos Suite 420 7735 Old Georgetown Acad l
Bethesda. Maryland 20014 l
DISTRIBUTION:
Docket File T. Novak J. Berggren NRC PDR R. Tedesco L. Iremper Local PDR G. Lainas NSIC SSPB Reading J. Roe TERA.
NRR Reading OELD ACRS (16) 04).123lof$.
D. Eisenhut I&E (3) f,'? Hel temes R. Purole J. Mi.l ler, W.C Johnston N m
OF FICE h..
j
..,. k
.. 5 suRN.MEp...LTremPer..g.Berggren/.cc.
..J M.i.1.1 e r.
WJp.
ton.
..RTed..
O*rE >. 12/.)/80
..gdf.80
,12/)/30 J./ /8 12g/80 NSC FORM 314 (9 76) NRCM 3240 D U.S. GOVERNMENT PRINTING OFFICE: 1979-289-369
- _ _ ~,..
.p %g
!(,,er 7%
UNITED STATES i
NUCLEAR REGULATORY COMMISSION E
WASHINGTON, D. C. 20555
.1!
>%, v 4,/
DEO 4 380
....c Mr. J. H. Taylor, Manager Licensing Babcock & Wilcox P. O. Box 1260 Lynchburg, Virginia 24502
Dear Mr. Taylor:
Subject:
Request Number 1 for Additional Information on BAW-10120 and BAW-10130 We are currently reviewing Babcock and Wilcox licensing topical report numbers BAW-10129 and BAW-10130 respectively, entitled " LYNX 1, Reactor Fuel Assembly Thermal Hydraulic Analysis Code" and " LYNX 2, Subchannel Thennal Hydraulic Analysis Program".
The initial raviews reveal the need for the additional infonnation indicated in the enclosure.
This infornation is necessary to complete the review - its expeditious submittal will therefore be to Babcock and Wilcox advantage. Receipt of the information by December 15, 1980 will enhance the review continuity.
Sincerely, 9
f 3'-
V~ :.,.: s-a.
Robert L. Tedesco, Assistant Director for Licensing Division of Licensing cc: Mr. R. B. Borsum Babcock & Wilcox Suite 420 l
7735 Old Georgetown Road l
Bethesda, Maryland 20014
Enclosure:
As stated l
l l
QUESTIONS ON LYNX-1 (BAW-10129) 1.
In the energy equation (2-2). on page 2-2 how is the enthalpy of crossflow, h ), computed?
4 2.
In the lateral momentum equation (2-4) on page 2-4 how is the axial
~
velocity, V ), computed? Also, what values are typically used for g
s/1 and K for bundles in equation (2-4)?
3.
Paragraph 2.5 implies that the fluid density is a function of the local pressure rather than a uniform system pressure as in COBRA.
Is this true? If so, are the saturation properties also computed as functions of local pressure? Page 3-5 mentions system pressure so the issue is unclear.
4.
It appears that, except for the two-phase multipliers, there is no provision for two-phase slip in the momentum equation (3-10) on page 3-3.
Why isn't the definition of specific volume for momentum applied as is done in LYNX-2?
5.
Paragraph 3.3 states that the inlet pressure profile is improved based on the difference between the calculated and specified exit pressure profiles. How is this done? What is the new value of local pressure obtained? What is the difference in the solution between cases where inlet flows are specified and those where inlet l
pressures are given?
l l
6.
Is the crossflew solution on page 3-5 solved iteratively or directly?
7.
The energy equation (3-8) is implicit (contains h on both sides) i2 and should be solved simultaneously for all channels at each level to conserve energy properly. How is this done?
8.
Item 5 on page 4-1 states that LYNX-1 is not designed for subchannel analysis. What is considered the limiting factor?
i I
9.
What are the pressure drop and assembly lift modifications -to the form loss ccefficients mentioned on page 5-E? They are not discussed or referenced elsewhere.
l l
1 l
l l
OUESTTONS ON LYNX-2 (SAS-10130) 1.
How are values detennined for the factor f in equation (2-2)?
D 2.
Is the definition M2=MlM in the footnote on page 2-4 used for both momentum flux and drag terms?
3.
Why are derivatives of V' with respect to pressure and enthalpy included on page 2-5? Is the density computed as a function of local pressure or system pressure? Are saturation properties computed with local or system pressure?
4 Why is the degenerate crossflow equation (2-23) used in LYNX-2 and not LYNX-l?
5.
Baker's chart (page 2-10) was developed for hori: ental flow. What is the justification for its use in vertical subchannels?
6.
Romies' fann loss multiplier (page 2-16) was developed for sudden expansions in a pipe. What is the justification for its application to grids?
7.
Why not use a boundary value solution like LYNX-1 and COBRA-3C?
8.
What is the actual form of the set of equations (3-5)? Please show the actual difference equations.
9.
It is not clear what is being done in section 3.4 on transverse exchange.
Please explain the technique in terms of how interbundle exchange is incorporated into the subchannel equations.
- 10. What provision is made for reverse flow in the momentum and energy equations?
- 11. What is the friction reduction factor (SPACER) on the flow chart on page 6-3? It isn't mentioned in the text.
l
-~.-
10.
For the COBRA-3C comparison discussed on page 7-3, did B&W run COBRA-3C separately or were the results taken from Sutey and Rowe's report? If B&W ran the code, what input options and parameters were I
used?
- 11. The flow regimes for heat transfer discussed oit page A-2 mention bulk boiling and superheated regions but no transition boiling or l
film boiling. Why aren't these parts of the boiling curve included?
12.
Baker's flow regime map (page A-3) was developed for horizontal fl ow. What is the qualification for its use in vertical flow?
- 13. On page A-3, wnat friction multiplier is used for form loss pressure drop?
Also, how is the effect of two-pnase flow accounted for in acceleration pressure drop?
e m_w----y y
~.9
,m y
g yi
,ap,,.,,c_
, _.- _ _ y
,