ML20100A145
| ML20100A145 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 11/19/1984 |
| From: | Hufham J TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8412030486 | |
| Download: ML20100A145 (2) | |
Text
{{#Wiki_filter:( S TENNESSEE VN, E, 6. EY AUTH.O..R,ITY A .e WMNnu#t Yow *eh Y A 04 SSi(e$)erp1f,*. Ig BLRD-50-438/83-51 BLRD-50-439/83-44 U.S. Nuclear Regulatory Comission Region II Attn: Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - UNCONSERVATIVE PROCEDURE FOR SUBTRACTING SEISMIC ANCHOR MOVEMENT STRESS FROM THERMAL STRESS - BLRD-50-438/83-51, BLRD-50-439/83 SECOND INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector P. E. Fredrickson on September 27, 1983 in accordance with 10 CFR 50.55(e) as NCR BLN CEB 8305. This was followed by our interim report dated October 24, 1983. Enclosed is our second interim report. We expect to submit our next report by August 5,1985. If you have any questions, please get in touch with R. H. Shell at FTS 858-2688. Very truly yours, TENNESSEE VALLEY AUTHORITY pJ. W. Hufham, Manager P Licensing and Regulations Enclosure cc: Mr. Richard C. DeYoung, Director (Enclosure) Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Records Center (Enclosure) Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 8412030486 841119 DR ADOCK 05000438 PDR UFF[CI Al, copy 1 ne c , o,,e, men, emoie,,, 'll L
ENCLOSURE v I BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 { UNCONSERVATIVE PROCEDURE FOR SUBTRACTING SEISMIC ANCHOR MOVEMENT j STRESS FROM THERMAL STRESS BLRD-50-438/83-51, BLRD-50-439/83-44 NCR BLN CEB 8305 10 CFR 50.55(e) SECOND INTERIM REPORT Description of Deficiency The secondary stress range check worksheet used in the qualification and documentation of the Bellefonte (BLN) rigorcus analysis is unconserva-tive when (1) a seismic anchor movement (0.".'i} ct r a aa ia anhtnan tad from a thermal stress and (2) the SAM stress was not originally contained in the thermal stress. The TPIPE program used in the rigorous analysis combines SAM with either code equations 10, 11, or 9U/9F. The worksheet used on the BLN rigorous analysis instructs the an11yst to subtract the maxitum SAM stresses from the rigorous analysis without investigating the load combination. If the load case SAM is not combined with equation 10, then the above procedure is not correct, and could yield unconservative results. Interin Progress The secondary stress n3nge check worksheet was revised and was included as attachment 207-6 in the BLN Rigorous Analysis Handbook which was issuel March 5,1984. Problems in which the secondary stress range check worksheet was used will be reviewed. The results of this review will be included in the next report. =_}}