ML20086L355
| ML20086L355 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 01/31/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8402080197 | |
| Download: ML20086L355 (2) | |
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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA. TENNESSEE 374of 400 Chestnut Street Tower II January 31, 1984 BLRD-50-438/82-39 BLRD-50-439/82-35 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 PLANT UNITS 1 AND 2 - DEFICIENT PIPE SUPPORTS -
BLRD-50-438/82-39, BLRD-50-439/82 FOURTH INTERIM REPORT The subject deficiency was initially mported to NRC-0IE Inspector R. V. Celenjak on December 15, 1981 in accordance with 10 CFR 50.55(e) as NCR BLN BLP 8130. This was followed by our interim reports dated June 21, 1982 and January 24 and July 14, 1983 Enclosed is our fourth interim report. We expect to submit our next report by July 31, 1984.
Although in our July 14, 1983 letter we had stated that this deficiency only applied to enit 2, further investigation has myealed that both units 1 and 2 are affected.
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, Manager Nuclear Licensing Enclosure oc (Enclosure):
Mr. Richard C. DeYoung, Director Office of Inspection and Enforcement l
U.S. Nr. clear Regulatory Commission Washington, D.C.
20555 Records Center Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 OFFICIAL COPY e402000197 840131 DR ADOCK 050004g gg7 p
I I i
An Equal Opportunity Ernployer
ENCLOSURE
.6 BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 DEFICIENT PIPE SUPPORTS BLRD-50-438/82-39, BLRD-50-439/82-35 NCR BLN BLP 8130 10 CFR 50.55(e)
FOURTH INTERIM REPORT Description of Deficiency An error was discovered in the thermal movement column of a support design load drawing (drawing No. 3BH04 19-NV-04). A zero was entered la the thermal movement column for the unrestrained directions of about 20 e.upports listed on this drawing when, in fact, there is a small amount of thermal pipe movement in these unrestrained directions. Because zero was listed as the thermal pipe movement of these supports, a frictional load was not included in the design of these supports.
Interim Progress The support design load drawings which were identified as having a zero in the thermal movement column in unrestrained directions have been revised to remove these zeros.
The determination has been made, based on paragraph J.2 of ITT Grinnell Engineering Instruction No.10, that frictional loading needs to be evaluated only for those supports at locations where the thermal movement in the unrestrained directions equals or exceeds 1/16 inch.
In order to minimize the number of supports requiring detailed
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evaluation, the support design load drawings were reviewed and revised to identify all supports with thermal movements equaling cc exceeding
- 1/16 inch in unrestrained directions.
Approximately 382 supports were identifled as requiring evaluation.
Each of these supports was evalusted in detail and redesigned as required. TVA will provide details of the required support revisions in our next report.
TVA is still investigating the nonconformance to determine the root cause and actions required to prevent recurrence. TVA will supply a final report upon conclusion of this investigation.
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