ML20134H454
| ML20134H454 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 08/01/1985 |
| From: | Hufham J TENNESSEE VALLEY AUTHORITY |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NCR-BLN-4353, NUDOCS 8508280421 | |
| Download: ML20134H454 (2) | |
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TENNESSEE VALLEY AUTHORITY CH ATTANOOGA, TENNESSEE 374of 1630 Chestnut Street Tower II u5 t,!!c 7 a8:I7 August 1, 1985 BLRD-50-438/85-20 U.S. Nuclear Regulatory Commission Region II Attn:
Dr. J. Nelson Grace, Regional Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323
Dear Dr. Grace:
BELLEFONTE NUCLEAR PLANT UNIT 1 - EXHAUST SILENCERS IMPROPERLY ANCHORED -
BLRD-50-438/85 FIRST INTERIM REPORT The subject deficiency was initially reported to NRC-OIE Inspector
-S. Weise on July 2, 1985 in accordance with 10 CFR 50.55(e) as NCR 4353.
Enclosed is our first interim report. We expect to submit our next report on or about October 31, 1985.
If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE. VALLEY AUTHORITY Sou J. W. Hufham, Manager Licensing and Risk Protection Enclosure cc:
Mr. James Taylor, 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 g*2* Ben Bi88lha s
si An Equal Opportunity Employer gg
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNIT 1 DIESEL GENERATOP. EXHAUST SILENCERS IMPROPERLY ANCHORED BLRD-50-438/85-20 NCR BLN 4353 10 CFR 50.55(e)
FIRST INTERIM REPORT Description of Deficiency A reinspection of the Bellefonte Nuclear Plant (BLN) unit 1 diesel generator exhaust silencer foundation was performed as a result of NRC Information Notice 85-25, " Consideration of Thermal Conditions in Design and Installation of Supports for Diesel Generator Exhaust Silencers" and 10 CFR 50.55(e) nonconformance report (NCR) ' BLN 3615, (CDR BLRD-50-438/84-55, BLRD-50-439/84-
- 51) " Deficient Category I Components and Miscellaneous Steel." In this reinspection, the following conditions and drawing discrepancies were identified:
1.
Hairline shrinkage cracks were noted along the concrete surface of the support foundation.
2.
Some of the 1-inch-diameter MK5 anchor bolts did not have the designated 4-1/2-inch projection above the concrete surface of the support foundation. Therefore, the anchor bolt nuts do not have full thread engagement and/or a jam nut installed as called for by design drawings.
3.-
The anchor bolt nuts should be loose to allow movement to accommodate thermal expansion, but were found to be tightened.
4.
Due to dirt, grout, and insulation, the physical condition of the slotted connections appear to prevent the required sliding movement to accommodate thermal expansion.
i The apparent cause of these deficiencies was a failure of construction l
personnel to install the items in accordance with TVA design drawings.
Interim Progress The subject NCR is being evaluated by TVA for determination of corrective action.
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Our next report will be provided on or about October 31, 1985.
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