ML19289E428
| ML19289E428 | |
| Person / Time | |
|---|---|
| Issue date: | 03/14/1979 |
| From: | Carbon M Advisory Committee on Reactor Safeguards |
| To: | Hendrie J NRC COMMISSION (OCM) |
| References | |
| ACRS-R-0823, ACRS-R-823, NUDOCS 7904170546 | |
| Download: ML19289E428 (1) | |
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g NUCLEAR REGULATORY CCf4 MISSION 3,Q
. 'h j ADVISORY Mn4MITTEE ON REACTOR SAFEGUARDS
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g WASHf NGToN, D, C. 20555 fiarch 14, 1979 Honorable Joseph M. Hendrie Chairman U.S. Nuclear Regulatory Commission Washington, D. C. 20555
SUBJECT:
COMBINATION OF DYNAMIC LOADS AS A REULATORY DESIGN BASIS
Dear Dr. Hendrie:
This letter is in response to Commissioner Kennedy's question at the November 2, 1978 meeting between the Commissioners and the ACRS, con-cerning the combination of dynamic loads as a design basis fer nuclear facilities.
'Ihe NRC Staff is considering the use of " Square Root of the Sum of the Squares" methodology when combining LOCA and seismic loadings for the primary coolant system boundary. %is may eliminate some possibly unde-sirable conservatism in load combination methodology; however, it ad-dresses only a small portion of the issues in question. W e treatment of structural supports for example, is not, at present, considered sim-ilarly.
The ACRS is aware of a number of technical programs addressing load-com-binations which have been initiated by the Office of Nuclear Reactor Reg-ulation under technical assistance contracts and through requests to the Office of Nuclear Regulatory Research. These may ultimately alter the Staff position on combined loads. However, their presently incomplete sta-tus makes a full commentary premature at this time.
The ACRS has established a Subcommittee to continue review of this ques-tion and will report to you at an appropriate time.
Sincere:.y, Max W. Carbon Chairman 79041705 %