ML20010H879
| ML20010H879 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 09/17/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8109290380 | |
| Download: ML20010H879 (2) | |
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TENNESSEE VALLEY AUTHORITY
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1 CH ATTANOOGA, TENNESSEE 37401 i
400 Chestnut Street 'Ibwer II y SICpg
",S. p September 17, 1981
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Mr. James P. O'Reilly, Director p
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h' f Office of Inspection and Enforcement U.S. Nuclear Regulatory Otumission D
'9 Region II - Suite 3100
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101 Marietta Street A
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Atlanta, Georgia 30303
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Dear Mr. O'Reilly:
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'Y RMJRPCNTE NUCLEAR PIANT UNITS 1 AND 2 - MAIN STEAM LINE ANALYSIS TRIPE INPUr ER"OR - NCR BIN CEB 8007
'1HIRD INTERIM REPORP i-We subject deficiency was initially reported to NIC4IE Inspector R. W. Wright on Ck:tober 2,1980 in accordance with 10 CFR 50.55(e). %is was followed by our interim reports dated October 31, 1980 and July 20, 1981.
Enclosed is cur third interim report. We expect to submit our next report by Decerter 8,1981.
If you have any questions concerning this matter, please get in touch with D. L. Lambert at FTS 857-2581.
Very truly yours, t
TENNESSEE VALLEY AUINORITY 0
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. M. Mills,b er Nuclear Regulation and Safety Enclosure cc: Mr. Victor Stello, Jr., Director (Enclosure)
Office of Inspection and Enforcement-U.S. Nuclear Regulatory Commission
. Washington, DC 20555 MN 1
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i 8'09290380 810917 3 PDR ADOCK 05000438 S
- PDR, An Equal Opportunity Employer
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ENCIOSURE BmMYNTE NLCLEAR PLANP UNITS 1 AND 2 MAIN STEAM LINE ANALYSIS TPIPE INPUT ERROR NCR BLN CEB 8007 10 CFR 50.55(e)
THIRD INTERIM REPORT Description of Deficiency he calculated effects of a steam hammer occurrence in the Bellefonte Neclear Plant main stea": lines have been questioned because of an input error in the TPIPE computer procram used in the analysis.
We input error occurred when several forcing functions with different arrival times were applied at individual node names. t is procedure is incorrect (though the appiteation of multiple forcing functions at a single node name is permissible provided all have the same arrival times).
In order to facilitate the analysis of the main steam lines, the camputer is programed to analyze only a portion of the total piping involved with each problem submittal. The problems affected by the subject input error are i
N4-lSM-A, B, C, K, and L.
W ese represent main steam line piping in valve room A, piping transversing into the Turbine Building, valve room B, and main steam line piping which penetrates primary containment, respectively.
Interim Progress n e affected problems listed above have all been rerun on TPIPE with the correct input data for TPIPE. Problems N4-lSM-B, N4-lSM-C, N4-lSM-K, and N4-lSM-L have been issued with the correct time history analysis included.
TVA has yet to resolve conputer problem N4-lSM-A because of difficulties in nodeling valve accelerations. W e program is now being checked and reviewed.
l It is scheduled for empletion in late October.
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