ML19339A758
| ML19339A758 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 01/02/1975 |
| From: | Vandenburgh D YANKEE ATOMIC ELECTRIC CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| WYR-75-1, NUDOCS 8011040741 | |
| Download: ML19339A758 (3) | |
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Telephone 6l7 366-90Ii rwx 710 390 0733 YANKEE ATOMIC ELECTRIC COMPANY urg,s.1 y'
.Yag i, k 20 Turnpike Road Westborough, Massachusetts 01581 manc
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January 2, 1975,
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sk ji United States Atomic Energy Commission Washington, D. C.
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Attention: Directorate of Licensing 9
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Subject:
Revised ECCS Analysis t.
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Reference:
- 1) License I;o. DPR-3 (Docket !!o. 50-29)
- 2) Proposed Jhange 1;o. 117, " Revised ECCS Analysis",
submitted to DOL /AEC on July 31, 1974.
3)
Buterbaugh, T.
L., Johnson, W.
J., and Kopelic, S.
D.,
" Westinghouse ECCS-Plant Sensitivity Studies", WCAP-8356, July 1974.
Dear Sir:
Pursuant to 10 CFR 50.46, a revised ECCS analysis ' ', performed in accordance with Appendix K to 10 CFR 50 was submitted to the Directorate of Licensing. The following additional information is hereby forwarded to you as verbally requested by members of your staff on December 23, 1974.
Table 411-1 of Feference 2 shows the results of the four large breaks that were analyzed.
It is concluded that the double-ended cold leg guillotine break with a discharge coefficient of 0.6 is the worst break. Additional large breaks were not analyzed on the following basis:
t (1) Westinghouse has reported sensitivity studies on a four in WCAP-8340 (Yankee Rowe has four log) (Proprietary Class loop plant and WCAP-8356 (Proprietary Class 2) 3).
In these studies, values of 1.0, 0.8, 0.6, and 0.4 were used for the break discharge coefficient. It was shown that the worst rupture is the double-ended cold leg 4
guillotine break with a discharge coefficient of 0.6; (2)
In performing Appendix K analyses for their customers, Westinghouse customarily provided analyses with discharge coefficients of 1.0, 0.6, and 0.4, confirming the results of the above sensitivity study; GU 0 11040 7 Fj
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0 United States Atomic Energy Cor:nission January 2, 1975 Attn Directorate of Licensing Page Two (3)
Results shown in Table 411-1 sl.ow only a slight sensitivity to the value of the break discharge coefficient; (4) Theflowareaforadogble-endedcoldleggu{llotine break is only 2.84 ft.
compared to 8.25 ft.
for current design Pt.'as.
Thus, a much finer pesh in break sizes is involved for Yankee Rowe.
Respectfully submitted, YANKEE A'IOMIC ELECTRIC COMPANY D. E. Vandenburgh Vice President 11L/kg
P00R DMAL o
AEC DISTRIBUTIC*' FOR PART 50 DOCKET t.1 ATERI AL (TE.;POR ARY FOR.;)
CONTROL NO:
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F ROdenkee Atomic ~1ec. Co.
DATE CF DOC DATE REC *D LTR TV!X RPT OTHER Wettborough, !.Sss.
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XXX 40 50-29 DESCliiPTION: Ltr fumishing addl info re ENCLOSURES:
ECCS submittal re Proposed Change lio.117 on -
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