IR 05000400/1987041
| ML18022A624 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 03/11/1988 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML18022A623 | List: |
| References | |
| 50-400-87-41, NUDOCS 8803280150 | |
| Download: ML18022A624 (2) | |
Text
ENCLOSURE
Discrepancy Incorrect span lengths were used in analysis of supports for non-safety related conduits for Items
and 136/137 in Area Package A-2-261-1.
Also, one support carried two additional conduits not considered in the analysis.
Corrective Action (2)
The supports were re-evaluated by licensee engineers using the correct spans lengths and number of attachments.
The inspector reviewed the calculations and examined the items during walkdown inspections and verified that the calculations were corrected using the actual as-built span lengths and that all attachments were considered in the analysis.
No rework was required.
The licensee also conducted a reverification of the span lengths used in the Reg.
Guide 1.29 evaluations.
The inspector reviewed the results of their re-verification efforts which are summarized in CP&L Letter No. NS-876320(E)
dated July 20, 1987, Subject:
Reverification of Reg.
Guide 1.29 Spans.
Discrepancy A weld attaching a
tube steel support to a
baseplate was undersized, and one of four expansion anchors attaching the baseplate to the concrete surface had a loose nut for Item 47 in Area Package A-1-190-1.
Corrective Action In the original R.G.
1.29 analysis of this item, a 1/4 inch fillet weld was used when calculating the weld stresses.
The actual weld size attaching the tube steel to the baseplate was 1/8 inch on two sides and 1/8 to 1/4 inch on the other two sides.
Licensee engineers reanalyzed the welded connection and determined that a
1/16 inch weld was sufficient.
In order to evaluate the expansion anchor with the loose nut, licensee engineers evaluated the baseplate by assuming that the anchor with the loose nut was missing and analyzed the baseplate by considering it was installed with three anchors only.
The stresses in the baseplate and loads on the three anchors were found to be acceptable.
The bolt with the loose nut was retorqued.
The inspector examined the calculations and verified the licensee's analysis was acceptable.
In order to determine if problems (e.g.
loose nut, improper thread engagement, etc)
existed with other non-safety related expansion anchors and other expansion anchors which were not subjected to gC inspection, licensee engineers inspected a
random sample of these anchors.'he sample size was based on the total 8803280150 880311.
PDR ADOCK 05000400
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