ML19350E342
| ML19350E342 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 06/10/1981 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Borgmann E CINCINNATI GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8106170345 | |
| Download: ML19350E342 (3) | |
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION r,.,, 4W/ -
4 WASHINGTON, D. C. 20555
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The Cincinnati Gas and Electric Company 6
ATTN: Mr. Earl A. Borgmann Vic 2 President, Engineering s
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O. Box 960 s
cincinnati, Ohio 45201 y
Dear Mr. Borgmann:
Subject:
Potential Loss of NPSH In BWR ECCS Suction Piping Enclosed is a concern which we believe is applicable to all near term BWR applicants. The concern results from the potential for damage to ECCS pumps from cavitation caused by local flashing in the system suction lines.
Please advise when you will respond to the enclosure.
Sincerely, f
V O
Robek(L.
ed o, Assistant Director for Licensing Division of Licensing
Enclosure:
As stated cc: See next page 4
A 8196176345
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"r. Earl A. Borgmann Vice President - Enoineering Cincinnati Gas & Electric Company P. O. Box 960 Cincinnati, Ohio 45201 cc: Troy B. Conner, Jr., Esq.
Robert A. Jones, Esq.
Conner, Moore & Corber Prosecuting Attorney of Clermont 1747 Pennsylvania Avenue, N.W.
County, Ohio Washington, D. C.
20006 154 Main Street Batavia, Ohio 45103 Mr. William J. Moran General Counsel Resident Inspector /Zimmer Cincinnati Gas & Electric Company RFD 1, P. O. Box 2021
Mr. John Youkilis Porter, Stanley, Arthur Office of the Honorable William Gradison and Platt United States House of Represent;tives 37 West' Broad Street Washington, D. C.
20515
' Columbus, Ohin :43215 Mr. James D. Flynn, Manager Licensing Environmental Affairs Cincinnati Gas & Electric Company P. O. Box 960 Cincinnati, Ohio 45201 David Martin, Esq.
Office of the Attorney General 209 St. Clhir Street First Floor Frankfort, Kentucky 40601 Leah S. Kosik, Esq.
l 3454 Cornell Place Cincinnati, Ohio 45220 W. Peter Heile, Esq.
Assistant City Solicitor Room 214, City Hall Cincinnati, Chic 45220 John D. Woliver, Esq.
Clermont County Community Council Box 181 Batavia, Ohio 45103 Mrs. Mary Reder Box 270, Rt. 2 California, Kentucky 41007 Andrew B. Dennison, Esq.
200 Main Street Batavia, Ohio 45103
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ENCLOSURE REACTOR SYSTEMS BRANCH 212.80 Calculations of NPSH available to ECCS pumps in BWRs are normally provided with reference to the pump suction. We are concerned that under certain post arcident conditions the potential may' exist for damage to ECCS pumps from cavitation because of local flashing in the system suction lines. The potential can result for example from local elevation changes in the piping runs. Calculations of NPSH available at the pump suction may erroneously assume liquid continuity up to the point of pump suction. We require therefore that the applicants provide calculations demonstrating that all points in all safety related suction piping, the NPSH available is adequate to preclude local flashing under the worst postu-lated conditions.
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