ML20199L588
| ML20199L588 | |
| Person / Time | |
|---|---|
| Issue date: | 09/21/1998 |
| From: | Sheron B NRC (Affiliation Not Assigned) |
| To: | Smith N SEISMIC QUALIFICATION UTILITY GROUP |
| References | |
| REF-GTECI-A-46, REF-GTECI-SC, TASK-A-46, TASK-OR NUDOCS 9901280063 | |
| Download: ML20199L588 (1) | |
Text
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Mr. Ngil Smith, Chairman September 21, 1998 6['
Seismic Qualification Utility Group C/o MPR Associates, Inc.
320 King Street Alexandria, VA 22314
SUBJECT:
USE OF GIP METHOD A
Dear Mr. Smith:
i j
This is in response to your letter of August 18,1998, regarding the use of GlP Method A. This letter was an outgrowth of the SQUG effort to ma.ie a determination how SQUG members used 1
Method A in the implementation of Unresolved Safety issue (USI) A-46. Part of this effort included a SQUG letter dated June 10,1998, regarding the basis for use of GIP Method A.
SOUG also considered potential clarifications to the GlP cautionary notes and limitations on the use of Method A (Part II, Section 4.2.3, as contained on page 4-16 of GIP-2).
SOUG preposes that the generic Concems on the usc c f Method A should be closed out and that any r tant specific implementation concerns should be addressed in the plant-specific e
evaluations. NRC agrees that implementation of the methods for comparing equipment seismic capacity to seismic demand is plant-specific in nature. Where licensee summary reports and USl A-46 submittats are unclear in this area, including the implementation of Method A, the staff will seek clarification as part of the plant-specific review effort.
SQUG proposes a revised page 4 for NARE guidelines (originally provided to the NRC on July 15,1998). As you are aware, the staff is currently reviewing the NARE Guidelines and will provide our comments separately. However, we believe the proposed clarification for the NARE guidelines may not be uniformly implemented in that the condition "that the amplification factor between the free field response spectra and the in-structure response spectra will not be more than about 1.5"is not clearly delineated. This condition is part of the limitations contained t
in GIP-2.
l Please contact Richard H. Wessman, Chief of the Mechanical Engineering Branch, at (301) 415-3288,if you have any questions.
Sincerely.
0,%pt cWeri bv i
Brian W. Eheron, Acting Associate Director for Technical Review Office of Nuclear Reactor Regulation cc: J. Fisicaro, Duke Power Co.
M. Burzynski, TVA DOCUMENT NAME: G:\\Wessman\\Methoda.wpd J. Butler, NEl W. Schmidt, MPR Distribution: File Center EMEB RF l
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