ML19291C044
| ML19291C044 | |
| Person / Time | |
|---|---|
| Issue date: | 11/01/1979 |
| From: | Bagchi G, Richardson J NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| To: | Mattu R Office of Nuclear Reactor Regulation |
| References | |
| REF-GTECI-B-06, REF-GTECI-PI, REF-GTECI-RV, TASK-B-06, TASK-B-6, TASK-OR NUDOCS 8001110153 | |
| Download: ML19291C044 (2) | |
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J NOV 01 1979 MEMORANDUM FOR:
R. K. Mattu Mechanical Engineering Branch FROM:
J. E. Richardson, Chief Mechanical Engineering Research Branch G. Bagchi, Chief Structural Engineering Research Branch
SUBJECT:
TASK ACTION PLAN (TAP) B-6, " LOAD, LOAD COMBINATIONS AND STRESS LIMITS" In carrying out the latter phases of Task Action Plan (TAP) B-6, we plan to adopt the load factor approach.
Load combination methodologies for both civil structures and mechanical equipment and components will depend on load factors. As you know, load factors have traditionally been used in dealing with civil engineering load combinations, whereas the mechanical engineering treatment has generally preferred stress limits. We plan to develop a methodology for mechanical equipment and components which embraces load factors and stress limits. Our basis for introducing load factors into the load combination methodology for mechanical equipment and components is that it allows a greater degree of flexibility in identifying uncertainties in each element of the load combination, a more unifonn distribution of risk, and in the end, safer,.
more rational, and more economical designs.
Load and response coiabinations for containments and structures will be handhd through the Structural Engineering Research Branch (SRB). A plan for addressing Phase 3 of TAP B-6 will be developed by the SRB incorporating the technical assistance work currently being conducted for the Structural Engineering Branch. This plan will be sent to NRR for review and coment.
The research effort investigating decoupling of loads and methods of response combination for equipment, piping, supports and components will continue under the Mechanical Engineering Research Branch using Lawrence Livermore Laboratory (LLL).
Interim results will be available in June 1980. A work plan for work beyond that date will shortly be' prepared at LLL and transmitted to you for review and coment.
Some features of 1734 168 8 001110 /d]
NOV 01 1979 R. K. Mattu
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this work plan are apparent already.
Specifically, it will be risk oriented, will expand the present work to BWRs, and will address probabilities of small pipe breaks concurrent with small earthquakes.
.0. E. Richardson, Chief fiechanical Engineering Research Branch Division of Reactor Safety Research G. Ba chi, Chief Structural Engineering Research Branch Division of Reactor Safety Research cc:
T. E. Murley, RSR J. P. Knight, DSS S. Hanauer, DSS F. Schauer, DSS K. Wichman, D0R 1734 169
.