ML20009C002
| ML20009C002 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 07/13/1981 |
| From: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| GL-81-14, TAC-43663, NUDOCS 8107200143 | |
| Download: ML20009C002 (1) | |
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SACRAME 'To MUNICIPAL UTILITY DISTRICT [] 62o1 S Street. Box 15830, Sacramento. California 95813; (916) 452 3211 July 13,1981 d _ _..
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DIRECTOR OF NUCLEAR REACTOR REGULATION g-(
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DOCKET 50-312 RANCHO SEC0 NUCLEA'l GENERATING STATION UNIT N0 1 AUXILIARY FEEDWATER SYSTEM SEISMIC QUALIFICATION The Sacramento Municipal Utility District has reviewed your letter of February 10,1981 (Generic Letter No. 81-14) requesting informe cion on the seismic qualification of the Rancho Seco Unit 1 auxiliary feedwater system.
The entire Auxiliary Feedwater (AFW) System at Rancho Seco was designed and constructed to Seisr.ic Category I requirements. The analytical techniques, testing, evaluation methods and acceptance criteria used in the design of the AFW System are consistent with the methods used for other safety-grade systems at Rancht-Seco Unit 1.
The AFW system has been included within the scope of seismic related Bulletins 79-02, 79-04, 79-07, 79-14, 80-11, and II. Information Notice 80-21.
The analysis methodology for Seismic Class I systems such as the AFW system uses the " response spectrum" approach. The response spectrum approach uses the natural period, mode, shape, and dampening factors that are characteristic of the system and equipment, to determine the dynamic loads that would result from a seismic event. General primary stresses, including those resulting from gravity loads, operating loads and operating temperatures, are combined with the seismic stresses resulting from the amplified earthquake response spectrum. The combination of stress is required to be below allowable stress set f,rth in the appropriate codes and standards, such as ASME Section III. A more detailed description of the methodology is given in Appendix 5B of the FSAR.
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ohn 'J. Mattimoe Assistant General Manager and Chief Engineer p
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