ML19326D200
| ML19326D200 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 01/29/1975 |
| From: | Office of Nuclear Reactor Regulation, US ATOMIC ENERGY COMMISSION (AEC) |
| To: | |
| Shared Package | |
| ML19326D193 | List: |
| References | |
| NUDOCS 8006090624 | |
| Download: ML19326D200 (1) | |
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TOPICAL REPORT EVALUATION Report Identification: BAW-10035, Rev. 1 Report
Title:
Fuel Assembly Stress and Deflection Analysis for Loss-of-Coolant Accident and Seismic Excitation Report Date: December 1972 Originating Organization: Babcock & Wilcox Reviewed By: Mechanical Engineering Branch, NRC Division of Technical Reviev
SUMMARY
OF TOPICAL REPORT:
The dynamic response of fuel assemblies and fuel support structures due to a postulated reactor coolant break (LOCA) near the outlet nozzle was presented. Axial loads on the control rods and the guide tubes are produced by lif ting of the fuel assemblies under the LOCA loads. A simplified non-linear single mass model was used to confirm that the guide tubes will not buckle. A linear nine mass mathematical codel was used to compute the vessel and internals responses at the upper and lower grid plates. The nine mass analysis was also used to derive an input for a separate non-linear analysis of the fuel assemblies.
Additional testing was conducted to confirn control rod insertion function and to determine the non-linear mechanical behavior of the fuel assemblie's. The seismic (DBE) analysis was based upon the use of the El Centro 1940, S-N, ti=e history input and the use of the LOCA dynamic system mathe=atical models.
SUMMARY
OF REGULATORY EVALUATION:
We have reviewed the subject report, including the mathematical models, analysis methods, and the srructural design criteria. The functional reliability of the fuel support structures was also evaluated.
The fuel assemblies will withstand the. combined effects of the LOCA and DBE loading.
REGULATORY POSITION:
The subject report provides an acceptable basis for de=onstrating the functional reliability of fuel assemblies to withstand the cocbined effects of the LOCA and DBE loading. This report is acceptable and may be referenced in license applications for similar 850 MWe class PWR plants with skirt-supported vessels.
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