ML20210F400
| ML20210F400 | |
| Person / Time | |
|---|---|
| Issue date: | 07/26/1999 |
| From: | Skay D NRC (Affiliation Not Assigned) |
| To: | NRC (Affiliation Not Assigned) |
| References | |
| NUDOCS 9907300126 | |
| Download: ML20210F400 (31) | |
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UNITED STATES l
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,j NUCLEAR REGULATORY COMMISSION p
2 WASHINGTON, D.C. 20666-0001 l
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July 26, 1999 l
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SUMMARY
OF MEETING WITH THE GENERAL ELECTRIC COMPANY (GE)
SUBJECT:
DISCUSS ISSUES RELATED TO GE'S METHODOLOGY FOR COMPUTING HYDRODYNAMIC LOADS FOR THE GE EMERGENCY CORE COOLING SYSTEM SUCTION STRAINERS On June 15,1999, the NRC staff met with the General Electric Company (GE). The purpose of the meeting was to discuss GE's proposed approach to compute the hydrodynamic loads for the GE stacked disc suction strainer. Upon resolution of all staff issues,it is the aim of GE to obtain NRC approval of this approach for all plant-specific applications. Enclosed is a list of meeting attendees and a copy of the NRC staff's handouts.
BACKGROUND in November 1997, GE had submitted for NRC review licensing topical report (LTR)
NEDC 32721P, " Application Methodology for the General Electric Stacked Disk ECCS Suction Strainer." The LTR includes the GE methodology for the calculation of drag loads imposed upon the stacked disk strainer when subjected to a hydrodynamic event within the suppression pool. These hydrodynamic events are the result of either a postulated loss-of-coolant accident (LOCA) or the actuation of one or more safety relief valves (SRV). Either event can cause a significant movement of the water mass within the suppression pool which, in turn, imposes drag forces on submerged structures within the suppression pool.
DISCUSSION The purpose of the meeting was to discuss specific concems that the staff identified in its review of the topical report. The NRC indicated that if the staff and GE could not resolve the technical issues and satisfactorily close the review of the topical report, the NRC would need to meet with the licensee.e that had installed the GE strainers to seek resolution.
The staff was concerned that the actual test results did not demonstrate the trends that were obtained through analytical methods. Specifically, the margin decreases significantly when using the test data verses design data. Therefore, there will be more reliance on the test data and less on the analytical predictions. The staff discussed the two major di+ferences between the NRC and GE with respect to the tests. These were: (1) the f act that the tested displacements were not uniform along the length of the strainer, and (2) the fact that the test
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velocity profiles did not match event profiles.
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Rocky Sgarro, Chairman BWR Owner's Group ECCS Suction Strainer Committee c/o Pennsylvania Power & Light 2 North Ninth Street, Mail Code GENA 61 Allentown, PA 1
Thomas A. Green, Technical Project Manager General Electric Company 175 Curtner Avenue, Mail Code 182 San Jose, CA 95125 Thomas J. Rausch, Chairman BWR Owner's Group clo Commonwealth Edison Nuclear Fuel Services 1400 Opus Place Downers Grove, IL 60515 i
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MEETING ATTENDANCE LIST June 15,1999 1
NAME AFFILIATION Gary Holahan NRC John Hannon NRC George Hubbard NRC Keni Kavanagh NRC i
Rob Elliott NRC Michael Marshall NRC Jack Kudrick NRC Tony D'Angelo NRC Donna Skay NRC Gary Hammer NRC l
Richard Lobel NRC Tony Mendiola NRC Jeff Shackelford NRC Mike Davis NRC Ain Sonin MIT (NRC consultant)
Joe Quirk GE John Lynch GE Kent Cole GE Tom Green GE Alan Bilanin Continuum Dynamics 1
Deann Raleyh Bechtel John Rogers GPU Nuclear inadi Nayakinadi Detroit Edison Rosemary Reeves NUS Information Services Kevin Brinckman PP&L ENCLOSURE 1
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2 The staff suggested that the first issue could be addressed by accounting for the triangular profile of displacement and modifying the test results accordingly. For the second issue, the basis of the staff's concern is that GE chose to use solid surface data to establish the appropriate conditions. The staff believes that data obtained from testing a porous sphere is applicable. The GE strainer tests were conducted at a Keulegan-Carpenter number of zero while the GE staff be!ieved that event conditions could vary from zero to two. If this is true, an uncertainty factor of two could exist which could result in many of the installed strainers exceeding the GE design curve. The staff acknowledged that there is margin to failure abcve the GE design curve on the order of a factor of 2.
After the staff presentation of the major issues left to be resolved, GE began by indicating that they agreed with the staff on how the issues should be resolved. The major change to the position set forth by GE was the possible range of K. Previously, the staff had been told that the value could range between zero and two. During the meeting, GE concluded that the maximum value of the Keulegan-Carpenter number is 0.1 as opposed to the the previous estimate of 2.0. This change alone would significantly reduce the uncertainty to about 15 percent rather than the factor of two. However, it was noted that the method of calculating the value of K would need to be documented along with the supporting justification. GE committed to submit a supplement to the topical report that will include a new analytical methodology, a justification for a K number of 0.1, how this data will be incorporated into the test data, and the effect on the design margin for each of the affected plants. In addition, a systematic error analysis would be conducted to determine what uncertainties existed in the test results and what appropriate margin should be applied for design basis accident analyses. GE stated that the supplement to the topical report would be submitted in about four weeks from the date of the meeting.
Original signed by Donna M. Skay, Project Manager Project Directorate 'll Division of Licensing Project Management Office of Nuclear Reactor Regulation
Enclosures:
Distribution:
Hard Coov w/encI
- 1. List of Attendees Central Files OGC PD3 r/f
- 2. NRC Presentation Handouts PUBLIC ACRS DSkay E-Mail w/ encl 1 JZwolinski/SBlack RElliott JHannon JKudrick KKavanagh GHubbard GHolahan MMarshall TD'Angelo GHammer RLobel JShackelford Mdavis
- See previous concurrence DOCUMENT NAME: G:\\PDill-2\\skay\\mtgsum.wpd OFFICE PM:PD3-2 L LA:PD3-2 NRR:SPLB SC:PD3-2g
[kM.
NAME DSKAY M2h CMOORE*
GHUBBARD*
M/h09 DATE d6/ O/99 07/15/99 07/23/99 U