ML19261A430
| ML19261A430 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 01/15/1979 |
| From: | Groce R Maine Yankee |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| WMY-79-3, NUDOCS 7901180165 | |
| Download: ML19261A430 (10) | |
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ENGINEERING OFFICE WESTBORO, MASSACHUSETTS 01581 w
v G17-306-9011
- wd WMY 79-3 January 15, 1979 United States Nuclear Regulatory Commission Washington, J.
20553 tit t en t ion : Office of Nuclear Reacuor Regulation Referrnces:
1)
License No. DPR-36 (Docket No. 50-309) 2)
Letter UMY 79-1, D. E. Vandenburgh te USNEC, January 8, 1979, Subj ect : Corrections to the TOuDEE2 Corrauter Code 3)
XN-75-41, Sapplemeni 1, " Exxon NucleaT Company WREM-Based PWR ECCS Evaluacion Model, Further Justification to Reflood IIcat Transfer Me!.13, " August 14, 19U 4)
XN-75-41, Supplement 5, Revision 1, " Exxon Nuc2 car Company WREM Based Ceneric PWR ECCS Evaluation Model, Supplcmentary Inf ormation Relating to Blowda.m and llotup Analysis,"
October 3, 1975
Dear Sir:
Subj ect :
Resulte, of Steam Cooling MoJel Study, Un;ng YAEC's Corrected 1
Version of T00DEE2 The consenatism of peak clad temperatures predicted by the steam coolint; model la YAEC's corrected version af T00DEE2 (Ref erence 2) has been s erif ted by._omparison to FLEC'lT low flood rate experimental data.
A similar comparison justifying the steam cooling model in YAEC's original version of T00DM2 was made by Fxxon Nuclear Company, Inc.
(References 3 and 4).
Peak dad temperature results f rom FLECilT experimenal run nurbers 3183, 0487, 0690 ar.d 0791 are used for this comparison.
The ficau ates and system pressures for the four runs are 1.0/21,.8/18,.6/15, ami.4/15 (in/sec)/ PSIA respectively.
SevI ral code changes were made to TRODEE2 in order to s2.nulate FlECllT henter rods.
These chan:,es are outlined n Ref erence 4.
In the simulation of the above FLECllT runs with YAEC's corrected version of T00DEE2, the rupture point is taken at the 6 ft. elevation at zero time and no flow reductien due t..
blockage is considered.
I'a Figures 1 through 4, peak clad temperaturuc versus ekvations f rom the above FLECllT experiments ar3 compared to predicted values using the steam cooling model in YAEC's uncerrected veGsion of TOODEE2 and, I
again, the steam cooling model in tha corrected xersion of T00DEE2.
The results are summarized'in tabulor form for all FLECllT comparisons in Table 1.
In all cases the differences between FLECilT predictions before and after the T00DEE2 corrections were small (mean AT at the peak temperature location was 3.50E.).
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United States P2 clear Regulatory Commission January 15, 1979 Attention: Office of Nuclear Reactor Regulation Page 2 The figures show that, for almost all points the steam cooling model predicts conservative peak clad temperatures with respect to FLECHT in both corrected and uncorrected versions of T00DEE2.
Small differences w noted in the results for FLECilT Run No. 0690 using the corrected version of F00DEE2 at the 2 and 8 ft. elevations where slightly non-conservative temperatures were obtained.
The temperature predictions by the corrected version of T00DEE2 are an improvement (i.e., more conservative) over the temperatures preficted by the uncorrected version.
Slight non-conservative temperatures were predicted by the uacorrected version for several FLECHT runs at either the 2 ft. or 10 ft. elevations.
Since the temperatures at these elevations are low in either case, the discrepancies are minor.
The maximum non-conservatism between FLECllT and predicted peak clad t emI'e ra t u re (using the, corrected version of T00DEE2) occurs at the 8 ft.
elevation in Run 0690 where the corrected version predicts a 440F lower temperature. Ilowev er, the maximum peak clad temperature for this case (at tne 6 ft. elevat ior 1 was conserv it ively predicted to be 160F higher than the FLECllT data.
In Figures 5 through 8, the time dependent clad temperatures at the 6 ft. level from FLECllT experiment run numbers 0183, 0487, and 0690 are compared to predicted values obtained with both versions of T00DEE2.
Conservative temperature-time histories appear to be predicted by both versions of T00DEE2 for all runs.
In conclusion, the corrections made to T00DEE2 have an insignificant impact ca the temperatures predicted by the steam cooling model.
Generally the steam cooling model in YAEC's corrected version of T00DEE2 conservati>ely predicts FLECllT low flood rate data.
Non-conservative predictions against the FLECllT data do occur, but these are at non-maximum clad temperature ele:ations.
The steam cooing model in the corrected version of T00DEE2 continues to predict conservative maximum peak clad temperatures.
We trust that the above information is satisfactory.
If any questions should arise, please feel free to call Dr. Ausaf Ilusain at our engineering office, 20 Turnpike Road, Westboro, MA 01581, Tel. 617-366-9011, I'.x t en s io n 219.
Very truly yours, MAINE YANKEE ATOMIC POWER COMPANY
/AA R. II. Groce Licensing Engineer WJS/ah Eaclosures
i I
T/. ELE 1
-j COMPARISO: OF PEAK CLAD TDIPERATURES PREDICTED BY T00DEE2 STEAM COOLING MODEL TO FLECllT LO'J FLOOD RATE f
EXPERIMENTAL DATA PEAK CLAD TDIPERATURES, OF YAEC T00DEE2 YAEC T00DEE2 Elevation, Ft.
Flecht Run Number Flecht (Uncorrected)
(Corrected) 2 0183 992 1138 1138 4
1695 1845 1845 i
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2222 2331 2335 f
8 2080 2105 2103 10 1596 1587 1607 i
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0487 1039 1048 1048 4
1782 1940 1940 j
6 2335 2560 2563 8
2197 2333 2330 10 1702 1739 1760
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2 0690 955 926 926 4
1616 1630 1630 6
2119 2131 2135 8
1979 1938 1935 10 1500 1509 1527 2
0791 1007 1007 1006 2
4 1720 1817 1817 6
2326 2416 2419
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