ML20238D028
| ML20238D028 | |
| Person / Time | |
|---|---|
| Issue date: | 08/17/1987 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML20238C988 | List: |
| References | |
| RTR-REGGD-1.100, TASK-EE-108-5, TASK-RE REGGD-01.100, REGGD-1.100, NUDOCS 8709100520 | |
| Download: ML20238D028 (3) | |
Text
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ORAFT VALUE/ IMPACT STATEMENT BACKGROUND IEEE Std 344-1975, " Recommended Practice for Seismic Qualification of Class IE Equipment for Nuclear Power Generating Stations," was approved by the IEEE in January 1975. In August 1977, the NRC staff issued Revision 1 to Regulatory Guide 1.100, which endorsed IEEE Std 344-1975, subject to four excep-tions. Since then the staff has worked with the IEEE in developing IEEE Std 344-1987. As a result of these efforts, the exceptions to IEEE Std 344-1975 have been satisfactorily resolved.
IEEE Std 344-1987 also addresses several recent technical issues, for example, treatment of hydrodynamic loads, the limits of generic testing, the treatment of rattling, methods of qualifying line-mounted devices, and the use of actual seismic experience data bases to qualify identical or similar equip-ment. IEEE Std 344-1987 thus reflects the state-of-the-art technology.
Issuance of this Proposed Revision 2 is consistent with the NRC policy of evaluating the latest versions of national standards in terms of their suit-ability for endorsement by regulatory guides.
SUBSTANTIVE CHANGES IEEE Std 344-1987 applies to seismic and dynamic qualification of Class 1E (safety related electric) equipment. The nuclear industry has used this stan-3 dard for seismic qualification of mechanical equipment as well. The NRC staff recognizes this fact and intends to extend the application of this standard to seismic qualification of mechanical equipment by this regulatory guide. Spe-cifically, this regulatory guide covers two categories of equipment: (1) safety-related electric (Class 1E) equipment and safety-related mechanical equipment, and (2) equipment whose failure can prevent the satisfactory accomplishment of safety functions. Regulatory Position C.1 provides guidance for qualification of mechanical equipment that is consistent with current NRC practice.
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Regulatory Position C.2 recognizes the use of experience data as a method of seismic qualification. This method should be appropriately justified and will be evaluated by the NRC staff on a case-by-case basis.
Regulatory Positions C.1 to C.4 in Revision 1 are not included in this Proposed Revision 2 because they have been incorporated in IEEE Std 344-1987 as follows:
Regulatory Position in IEEE Std 344-1987 Rev. 1 of this Guide Section Number C.1 6.3 C. 2 7.6.2.1 C.3 7.6.2.5 C.4 10.3.2(6)
VALUE This guide endorses the latest version of a national standard and reflects the current state-of-the-art technology. The guide should also enhance the licensing process.
IMPACT Although the scope of this revision has been extended to include seismic qualification of mechanical equipment, the requirements are consistent with NRC current licensing practice. Thus, this regulatory guide does not impose any new requirements or costs on licensees or applicants.
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