ML19270G104
| ML19270G104 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 09/12/1978 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7906040256 | |
| Download: ML19270G104 (1) | |
Text
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- PHII.ADEl.PHIA E12CTRIC CDMPANY Peach Bottom Atomic Power Station Delta, Pennsylvania
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September 12. 1978 Mr. Boyce H. Crier Office of Inspection and Enforcement Region i United States Nuclear Regulatory Comunission 631 Park Avenue King of Prussia, PA 19405 SUMECT:
REPORTABLE OCCURRESCE - SUPPL.EMEY. TARY REPORT Confirming R. S. Fleischmann's conversation with Mr. E. B. McCabe, Region 1. Urtited States Nuclear Regulatory Commission on 9/12/78.
Reference:
Docket No. 050-277/278 Peach Botton Units 2 and 3 Technical Specification
Reference:
6.9.2a (9)
Report No. 2-78-38/IP Occurrence Date:
09/08/78 Supplemental Report:
Further analysis by our architectural engineer on the reactor water cleanup piping in the drywell has resulted in the following new acceleration values :
Unit 2
~4. 7g Unit 3 - 2.4g The reduction of the Unit 2 acceleration and the difference between Unit 2 and Unit 3 results frous the co=bination of the following.
i.
The actual center of gravity of the HO-15 valve was used in the new calculations as opposed to an assumed center of gravity in the old calculations.
The resulting change in the center of gravity is about 1.25 ft. and has a significant effect on the natural frequency of the piping system.
2.
Actual valve weights were used in the new calculations as opposed to estimates.
The actual valve weights are heavier than the previous estimates.
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7 3.
There are significant differences in the horizontal piping runs between units which a ffect the calculations.
Based on the above no immediate action is planned for Unit 3.
An additional restraint will be installed on Unit 2 during the present refueling outage.
90 g
Very truly yours,
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