ML19339A067
| ML19339A067 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 06/16/1976 |
| From: | Johnson W YANKEE ATOMIC ELECTRIC CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| WYR-76-71, NUDOCS 8010310705 | |
| Download: ML19339A067 (3) | |
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Attention: Office of Nuclear Reactor Regulation
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Subject:
YR Core XII Small Break LOCA Analysis Gj 4
Reference:
(1) License No. DPR-3 (Docket No. 50-29) w (2) Letter from D.E. Vandenburgh to USNRC (May 19,1976).
(3)
Letter from D.E. Vandenburgh to USNRC (May 11,1976).
(4)
Proposed Change No. 138 (May 11,1976).
(5)
Proposed Change No. 125, Supplement No. 8 (February 20, 1976).
Dear Sir:
Please find attached to this letter the results of a confirmatory small break LOCA analysis for YR Core XII submitted in accordance with Reference (2) above. This analysis was performed with the corrected accumulator flow rates as described in Reference (3), and with the accumulator pressure setpoint designated in Reference (4).
This analysis includes:
(a) a reanalysis of the 4-inch ID pipe rupture previously reported to be the limiting small break (b) an analysis of a 5-inch ID, a 10-inch ID, and a safety injection (2.25 inch ID) pipe rupture, and (c) an analysis of a 2-inch ID pipe rupture with no direct ECCS spillage to the containment.
The results of the analysis reported herein are within the limits specified in 10CFR50.46. The safety injection (2.25-inch ID) pipe rupture has been identified as the most limiting small LOCA break size but not more limiting than the results previously reported in Reference (5).
Any further questions regarding this analysis should be directed to Mr. W. J. Szymczak at our Engineering Office, 20 Turnpike Road, Westboro, Massachusetts 01581, (617) 366-9011, extension 2844.
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DATE RECEiveo W. P. Johnson 6/17/76 NLETTER ONOTORizED PROP INPUT FORM NUMBER OF COPIES RECElVED RORicNAL gfuNC LASSIFIE D Three signed OCOPY
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