ML20098F084
| ML20098F084 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 09/26/1984 |
| From: | Delgeorge L COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 9211N, NUDOCS 8410020296 | |
| Download: ML20098F084 (3) | |
Text
..
/i jl-h. Commonwealth Edison
) one First Nation 1 Pirza. Chicago. Ilknois
(
J Addr ss R;oly to: Post Offica Box 767
~"
(j Chicago, Illinois 60690 September 26, 1984
.Mr. James G. Keppler Regional Administrator U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn,-IL 60137 Sub ject:
Byron Generating Station Units 1 and 2 Cable Pan Hanger Inspections NRC Docket Nos. 50-454 and 50-455
Dear Mr. Keppler:
This is to provide the results of the cable pan hanger weld reinspection program which was described in testimony before the Byron ASLB in August, 1984.
Our plans for additional weld reinspections are also described.
The reinspection of cable tray hangers furnished by Systems Control Corporation was completed to ensure that no connections had missing portions of weld.
All type DV-8 connections and all other accessible connections were inspected.
A total of 30,217 connections were inspected for weld presence.
Of this total, 12,241 were DV-8s.
Thirty-nine DV-8s and forty-four other connections were reported to have missing portions of welds.
The worst case was a DV-8 detail where the horizontal unistrut was tack welded to the end channel at four corner locations.
Even though a substanstial portion of weld was missing, that hanger is still capable of transferring the design loads.
In no case did a missing portion of weld have design significance.
The attached Table I shows the results of the reinspection program.
When the program was expanded the first time from approximately 300 connections to well over 3000 connections, the 3000+ connections were selected cn the basis of identifying those connections that would not be satisfactory with R values of less than 47%.
The R value is the octual hanger capacity divided by the design capacity of the hanger.
The inspection program was subsequently expanded to include all DV-8 connections and all other accessible connections.
As shown in Table I, cll DV-8 connections have been reinspected.
One DV-1, two DV-3, one DV-7 and-four DV-162 connections have R values less than 0.47.
The results of the inspections of the remaining types of connection details indicate that none of these had R values less than 0.47.
Therefore, reinspection of these remaining inaccessible connections will not be performed.
The inaccessible DV-1, DV-3, DV-7, and DV-162 connections will be made accessible and will be reinspected.
This effort involves 339 DV-1, 158 DV-3, 1 DV-7, and 52 DV-162 connections, d
8410020296 840926 PDR ADOCK 05000454 J/
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'J. G'.JKeppler -
September 26, 1984
~Since thereLhave been over 30,000 inspections and only 83 of these had missing portions of welds, none of which were design signifi-cant,: there is no reason to suspect that anything of significance-will~ be found during.theseLadditional 550 inspections.
Therefore, the completion of: these ; inspections prior to fuel load is not necessary.
ihm expect that these additional inspections will take three to six~ weeks-They will be completed prior to exceeding 5% power.
Please advise-us if1this plan is unsatisfactory.
Very truly yours, 4
L. 0.-DelGeorge Assistant Vice President im
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