ML20080N674
| ML20080N674 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 02/15/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8402220315 | |
| Download: ML20080N674 (2) | |
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TENNESSEE VALLEY AUTHORITY y
CHATTANOOG A, TENNESSEE 37401 400 Chestnut Street Tower II
'BLRD-50-438/84-07 BLRD-50-439/84-06
~ U.S. Nuclear Regulatory Commission
-Region II Attn:
Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANTS UNITS 1 AND 2 - GLOBAL COORDINATES OF MAXIMIM PIPE MOVEMENTS - BLRD-50-438/84-07, BLRD-50-439/84 FIRST INTERIM REPORT The subject deficiency was initially reported to NRC-0IE Inspector C.~A. Julian on January 18, 1984 in accordance with 10 CFR 50.55(e) as NCR BLN CEB 8308. Enclosed is our first interim report. We expect to submit our next report by April 26, 1985.
If you have any questions, please get in touch with.R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills l Manager Nuclear Licensing Enclosure co:
Mr. ' Richard C. DeYoung, Directcr (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 a
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An Equal Opportunity Employer.
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ENCLOSURE l
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BELLEFONTE NUCLEAR PLANTS UNITS 1 AND 2
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GLOBAL COORDINATES OF MAXIMUM PIPE MOVEMENTS BLRD-50-438/84-07, BLRD-50-439/84-06 NCR BLN CEB 8308 10 CFR 50.55(e)
FIRST INTERIM REPORT t
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Description of Deficiency Bellefonte analysis isometric drawings have a note which relates maximum pipe movements to the global x, y, z directions. These notes are used to evaluate potential interferences at the plant site. Earlier versions of the TPIPE program did not list the maximum movements of the system, 'so movements were extracted and summed by hand. The analysts obtaining these movements did not note a nonglobal direction. Therefore, a direction on the isometric drawing does not mlate to the movement direction in the note. Since nonglobal coordinates were used in many analyses, this interference evaluation effort is erroneous and could lead to incorrect conclusions during the IE Bulletin 79-14 walkdown. The deficiency was discovered during a movement review.
Interim Progress
. TVA is in. the process of reviewing all Bellefonte analysis isometric drawings and skewed (nonglobal) coordinate systems. The Division of Engineering Design's (EN DES) Civil Engineering Support Branch (CEB) will evaluate the movement in the isometric note against the analyses movements, noting any nonglobal points. The skewed movements will be rotated to the global system and compared against those supplied on the isometrics for interference evaluation, or additional notes will be added to the isometrics to identify the skewed coordinates and the associated maximum movemen ts.
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