NL-09-1379, Evaluation Results Associated with Relief Request RR-P-3
| ML092520159 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 09/08/2009 |
| From: | Ajluni M Southern Nuclear Operating Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NL-09-1379 | |
| Download: ML092520159 (2) | |
Text
Southern Nucleai Operating Company, Inc.
SOUTHERN A.
September 08, 2009 COMPANY 1:*111'!~!;.1 to Se,'/'e }lmr \\vorld Docket Nos.: 50-348 NL-09-1379 50-364 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Joseph M. Farley Nuclear Plant - Units 1 and 2 Evaluation Results Associated with Relief Request RR-P-3 Ladies and Gentlemen:
In letter dated August 14, 2007 Southern Nuclear Operating Company (SNC) submitted relief request RR-P-3 as part of the Fourth Ten-Year Intervallnservice Testing Program Update. By letter dated July 1,2008 SNC received a request for additional information that included RR-P-3. By letter dated July 14, 2008 SNC responded and made a commitment to test motor driven auxiliary feedwater (MDAFW) pumps to determine if> 50 gpm flow could be achieved and to provide the results to the NRC. By letter date August 6, 2008 the NRC authorized RR-P 3 until July 1, 2010. By letter dated June 30, 2009 SNC stated"... additional time is required to evaluate the possible affects of testing the motor-driven auxiliary feedwater pumps using the test line to get a flow greater than 50 gpm. This additional time is needed based on high vibrations experienced while testing of the turbine-driven auxiliary feedwater pump test line that resulted in degradation of the piping."
The result of the evaluation is as follows:
Additional testing of the MDAFW pumps to determine if> 50 gpm flow could be achieved was deemed impractical by plant personnel, based upon previous experience when testing the turbine driven auxiliary feedwater (TDAFW) pump.
The minimum flow lines for the MDAFW and TDAFW pumps discharge into the common return line to the condensate storage tank (CST). Additional testing of the TDAFW pump indicates that unacceptable vibration is evident in the miniflow lines anytime flow is introduced into the return line to the CST.
Additional review of operating history for both the MDAFW pumps and TDAFW pump indicates that testing using the return line to the CST produces unacceptably high vibration of piping that could result in vibration-induced failures.
U. S. Nuclear Regulatory Commission NL-09-1379 Page 2 Therefore, it is concluded that, due to the potential for vibration-induced failures, quarterly testing the MDAFW pumps at a flow rate of> 50 gpm is impractical and the need for relief request RR-P-3 is still valid.
As a result, SNC is requesting that RR-P-3, currently authorized for an interim period until July 1, 2010, be authorized for the entire Fourth Ten-Year lSI Interval.
This letter contains no NRC commitments. If you have any questions, please advise.
M. J. Ajluni Manager, Nuclear Licensing MJAlJLS/lac cc:
Southern Nuclear Operating Company Mr. J. T. Gasser, Executive Vice President Mr. J. R. Johnson, Vice President - Farley Ms. P. M. Marino, Vice President - Engineering RTYPE: CFA04.054 U. S. Nuclear Regulatory Commission Mr. L. A. Reyes, Regional Administrator Mr. R. E. Martin, NRR Project Manager - Farley Mr. E. L. Crowe, Senior Resident Inspector - Farley