ML20076J863
| ML20076J863 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/03/1978 |
| From: | Dunn B BABCOCK & WILCOX CO. |
| To: | Roy D BABCOCK & WILCOX CO. |
| References | |
| TASK-*, TASK-GB GPU-0615, GPU-615, NUDOCS 8307060525 | |
| Download: ML20076J863 (6) | |
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THE BABC0CK & WILCOX COMPAllY POWER GE!iERATIOil GROUP To I
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pov. se3nsoer. Plant Desien F rc.~:
.e Bert M. Dunn, Manager. ECCS Analysis (21'38)
File No.
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Date Su bj.
April 3. 1978 March Activities Report l... i............................. w.
Attached please find the March Activities Report for the ECCS Analysis Unit.
cc:
R.C. Jones L.M. Sma1ec J.R. Biller H.A. Bailey ECCS Analysis Unit
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Pags Tv::
EM Dunn to DH Roy 4/3/78 Subj:
March Activities Report 1.
Acconolishments 1.1 Scheduled Activities A.
6-foot S.G. Level Control The 6-foot auxiliary feedwater (AIW) level control on the 205 FA plants has been determined inadequate to control the consequences of sr.all break transients. During this month, the analysis of 2
both the 0.05 ft2 pump suction break and the 0.05 ft pump dis-charge break were completed. For the pump suction break, it was determined that the core remained covered throughout the tran-sient.
Core uncovery was calculated for the pu=p discharge break starcing at sl600 seconds.
i Long term cooling for the discharge.. break.was estabi'ished.at s2600 seconds...The,gwo-phase mixture level in.the core at that time is less than 8. feet..; Simple hand calculations..indicatet..
that the fluid temperature.at the.. top..of.the core would be in ex-cess of 1600F...It is improbable ~ that the peak cladding tempera-ture would be less than 2200F. The results of the analysis are documented in the memo N.H. Shah to D.H. Roy, " Status of 205 FA Stall Break LOCA Analysis," March 29, 1978.
A presentation to higher management was held on March 31, and a l
resolution plan adopted...This. plan calls for a short cooling l
off period combined with outside assistance in the evaluation of fixes, analytical or design...By mid. April, a prioritized list of fixes will be available and ICCS wi".1 start.further evaluations.
l Once a fix is confirmed.it will,be. '.mple wnted and whatever licensing action..is required will.be tal.m.
3.
TVA Subcompartment Analysis In December 1977, B&W produced an asymmetric pressure evaluation of the TVA steam generator cavity, the results of which were felt to be too conservative. This evaluation was withheld pend-ing further work by ECCS in an undefined effort to drive down the conservatism. The analysis has now been successfully com-plated.
Steam generator and pump forces were reduced to 40% of the original prediction while pressurizer forces were increased by 15%.
TVA FSAR section 6.2.1.2 on subcompartment pressurization was amended to include the analysis for the steam generator com-partment.
The analysis results are contained in Design Memo 86-1316-01, a copy of which has been transmitted to Licensing to fulfill the 1 April commitment.
The design information was also transmitted informally to SMA on about 15 March so that the evaluation of the cavity loadings on B&W equipment could proceed.
N=N%
m.
Pags Three
,BM Dunn to D'd Roy t./3/78 Sub3: March Activities Report C.
BBR Second Project Internals APs The final two break cases of the BBR-2 reactor internals LOCA AP evaluation were completed and the results were docu::renced in 86-1542-01.
Calculation Summary 32-7325-00, which Design Memo documents the CRAFT 2 model inputs used for BBR-2, has been filed.
A licensing report (un-numbered) which summarizes the LOCA load design case results for the BBR-2 reactor internals was sent to IPI, thereby completing this analysis task as scheduled.
D.
Oconee Steam Generator Work was continued on the 177 FA steam generator loads model for use in secondary plant blowdown calculations (Reg Guide 1.121).
The geometric inputs.co CRAFT 2.for.4.. generic plant, analysis, are essentially complete and tbe,Q/A, check.cf.,ti ese inputs is in b
t Work is underway on evaluating the effects of initial progress.
fluid conditions.on the. blowdown loads; a comparison of TRAP and CRAFT 2 results is being~made to assess the effects of superheat on the loads.
E.
Consumer's Jet Impingenent Program This program is proceeding on schedule.
Thirty-five (35) target area equations are complete and impingement loadings on 33 of the targets sre; complete.
It was determined..during the.last half.cf March.that subsequent i
to B&W's initiation of work en break areas, reaction forces, target area equations and impingement loads associated with the lower cold les restraints.
Bechtel's change could invalidate all work performed to date on the lower cold leg by ECCS and SMA.
SMA is currently re-evaluating the pump suction guillotine break area with Bechtel's new gaps. Upor receipt of this new break area, ECCS will make an assessment of t? e impact that this change has on our previous work. This assessnant should be able to be mada early in April.
All concerned parties - ECCS, Integration, SMA, and Project Man-agement - were made aware of the potential negative scheduling
. impact that this change could have on Consumer's, PASNY, and TECO.
F.
AUTO TARGET Code The AUTO TARGET code is an effort to improve the tools by which ECCS analyses jet loads.
If successful this code will cut man hour and span times for jet load evaluation to 50% of their (an 8 man month saving). Because of its importance present cost its progress will be continually followed-in this progress report.
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BM Dunn to DH Roy Paga Tsur Subj:
March Activities Resort 4/3/78 During the end of February "CRAPHICS" installations at the Uni-versity of Michigan and Barberton were visited by ECCS and Com-puter Services personnel. B&W's representatives were impressed by the capabilities of both of these installations.
Af ter comparing the two installationi, it was determined that the system at the University of Michigan wouJ3 best serve ECCS's in-mediate needs at a substantially lower f:Lnancial investment than the Barberton system.
Licensing and' scheduling negotiations are now in progress between B&W and the University of Michigan for the rights to their (UM) graphics system.
It is anticipated that said negotiations should be favorably resolved in early April.
Once the negotiations are completed, actual hands on development by Cocputer Services of the auto target area code can begin.
1.2 Unse.heduled Activities II.
Problems See items 1.1A and 1.1E of this report.
III.
Administrative Mrs. C.W. Jones remains on indefinite medical leave.
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1978 R&D Quarterly Progress Report First Quarter Program - 845-7803 Project 01-ECCS Development b
Project Leader - R.C. Jones h Project Status 1.1 Objective The objective of this project is to prov.le B.'.W with a LOCA analysis technology and expertise necessary to responc' to changing NRC accept-ance criteria, utility and industry standards and competitor product development.
s-1.2 Objectives for Fir"st Ouarter
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A.
IndtistryRId;nizance'
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B.
Issuance of 1977 summary of accomplishments report.
C.
Issue report on the equilibrium REFLOOD study.
D.
Issue report on benchmarking of REFLECHT code to skewed power shape.
"FLECHT -daca.
u.
1.3 Ace'omnlishments This'Manth m'
r A. --The report. " Steady State and Transient LOCA Reat Transfer Tests,"
ARC-4673, 12/31/74, by M. B. Parker and C. G. Howard, was reviewed.
The rt.aults of that review are documented in the memo M. J. Means to Technical Reports Review File, " Review of B&W Heat Transfer Report for R&D." File 2A12.2, 1/20/78.
The memo M. G. DiQuarto to Technical Reports Review File, "Revier 'f B.
FLECHT Low Flooding Rate Skewed Test Series Data Report," WCAP-9..CE,
~
May 1977, File 2A12.2, 1/26/78, was written.
C.
The review of EPRI-309 performed in 1977 was documented in the memo R.C. Jones to Technical Reports Review File, " Review of Methods for Statistical Evaluation of Reactor Safety Analysis," EPRI-309, File 2A12.2, 1/31/78.
The memo R.C. Jones to Technical Reports Review File, " Review of BAW-D.
1411 - Stainless Steel Properties for PWR. Cores," File 2Al2.2,1/31/78, was written.
The sum =ary of accomplishments report for 1977 was issued this month.
E.
T05401
1 F.
The study of the impact of utilizing an equilibrium model in the REFLOOD code was continued this quarter.
Results indicate a signifi-cant decrease in flooding rates (=15%) relative to present analysis techniques. A draft report on the study has been prepared and re-viewed.
l C.
The REFLECHT code bench =arking study was completed this quarter.
Re'-
sults show that the present code is conservative relative to the data.
This study is documented in the memo H.C. DiQuarto to R.C. Jones,
" Comparison of REFLECHT Code With Experimental Results," February 14, 1978, File 2A12.2.
H.
A study is presently underway to determine the best method for calcu-lating reflooding heat transfer coefficients for skewed power shapes in the upper half of the core.
This work will investigate the suit-j ability of BWF to predict these heat transfer coefficients, expand upon the REFLECHT benchmarking work discussed above, and include the j
development and benchmarking of a REFLECHT-2 correlation.
Comparisons of BWF predictions to the data indicate that BWF is not suitable for power shapes in the upper half of the core.
The expanded REFLECHT work shows that REFLECHT is conservative for peaks at the 10-foot elevation. However, REFLECHT does not always follow the dans trends for the separate effect tests. At the 8-foot elevation, the
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REFLECHT correlation predictions are non-conservative for some tests and conservative for the others. Work on developing REFLECHT-2 is just starting.
I I.
A study has been started to find a method to remove the 0.8 multiplier on Mk-C reflooding heat transfer coefficients.
At present,he CE
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t and Westinghouse methods are being reviewed.
l 1.4 Objectives for Second Quarter A.
Industry cognizance.
B.
Issue report on equilibrium REFLOOD study.
C.
Issue report on method of calculating reflooding heat transfer coeffi-cients for skewed power shape.
D.
Issue report on method of calculating reflooding heat transfer coeffi-cients for Mark-C fuel.
2.
Use of Funds i,
2.1 1978 Budaet 1847 manhours and 12 conputations 2.2 Expenditures This Ouarter 348 manhours and 0.2 computer _ hours i
j 2.3 Expenditures to Date T05402 348 manhours and 0.2 computer hcurs.
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