ML20100J730
| ML20100J730 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 11/27/1984 |
| From: | Hall D ILLINOIS POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 55-84-22, U-10224, NUDOCS 8412100426 | |
| Download: ML20100J730 (3) | |
Text
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1A.120 U-10224 ILLINDIS POWER 00MPANY CLINTON POWER STATION P.O. Box 678. CLINTON, ILLINOIS 61727 November 27, 1984
' Docket No. 50-461 Mr. James G. Keppler Regional Administrator Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137
Subject:
Potential 10CFR50.55(e) Deficiency 55-84-22:
Screenhouse Gallery Platforms
Dear Mr. Keppler:
On October 17, 1984, Illinois Power Company notified Mr. F.
Jablonski, NRC Region III (Ref:
IP Memorandum Y-25867, dated October 17, 1984) of a potentially reportable deficiency concerning the installation of three (3) gallery platforms located in the screenhouse.
Our investigation of this issue is progressing and this letter is submitted as an interim report in accordance with the requirements of 10CFR50.55(e).
Attachment A provides the details of our investigation to date.
We trust that this interim report provides sufficient information to perform a general assessment of this potentially reportable deficiency and adequately describes our overall approach to resolve this issue.
Sincerely yours,
~
. P. Har Vice President RLC/lr(LCF)
Attachment cc:
NRC Resident Office Director, Office of I&E, US NRC, Washington, DC 20555 Illinois Department of Nuclear Safety INPO Records Center S
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m' 1A.120 U-10224-
-. ATTACHMENT A L
" Illinois; Power Company; i
s
- Clinton~ Power Station Docket No. 50-461 Potential 10CFR50.55(e) Deficiency 55-84-22:
- Screenhouse Gallery Platforms Interim Report Statement of-Potentially Reportable Deficiency During the; conduct of a non-safety.related concrete expansion anchor test program, it was discovered that three~(3)
Category l gallery platforms, located in the.screenhouse, had been installed as non-safety related.
An investi evaluation of this issue is being performed to d'gation and etermine the.
extent'of the problem, root cause, effect on installed hardware, and significance to the safety of operation of CPS.
Background
- As a result of a non-safety related concrete expansion-anchor test program, a violation of bolt spacing requirements was noted for the concrete expansion anchors which supported a gallery platform located in the screenhouse, elevation 707'6".
During the performance of.an evaluation of the load capacities
- for-the bolt spacing violation, Baldwin Associates Civil / Structural Engineering discovered'that the gallery platform; i
should have been installed in accordance with the requirements
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for Category 1-structures / components.
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~
j Investigation Results/ Corrective Action I
Preliminary investigation disclosed that a total of three (3)-Category 1 platforms were installed as non-safety related. _
Nonconformance Report No. 22002 was issued to document identified discrepancies.
Further investigation revealed that the. gallery platforms have safety-related conduit located directly below, and supported by these platforms.
The handrails, of the platforms, encompass safety-related piping, such that the piping could be. subjected to additional. loads should the platform supports fail.
During the dispositioning of NCR No. 22002, Sargent & Lundy.
,(S&L) requested ~ verification of installation torques of the high
" =
strength. bolts utilized for the gallery platforms, and inspection-of the structural welds for defects.
NCR No. 23162 was-initiated to ' document identified deficiencies.
-Illinois Power (IP) has prepared and is implementing an investigation plan:to determine the extent of this problem at the
.Clinton Power Station (CPS).
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lA.120
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U-10224 ATTACHMENT A (continued)
The investigatic. plan' includes:
- 1..
A review of documentation.will be performed to determine theJcause for the gallery platform. steel
-being receipt inspected and installed as non-safety related.
2.
An evaluation will be performed by Sargent &-Lundy and Illinois. Power to determine.if-.the gallery steel is usable in a Category 1 structure.
3.-
A thorough review will be performed of Structural Travelers to ensure that this problem is limited to the three (3)-identified screenhouse gallery platforms.
4.
Sargent & Lundy will perform a review for adequacy of the gallery platforms to carry design loads.
The complete scope and. root cause(s) of this issue have'not yet been identified, such'that a determination of remedial and
-generic corrective action ~can be made.
Identified discrepancies are being documented on NCRs and will be resolved in accordance with approved site procedures.
Safety Implications / Significance Illinois Power's investigation of.this potentially reportable deficiency is continuing.
The safety implications and sipificance will be assessed after further background
. information is evaluated.
.It is anticipated.that approximately ninetyf(90) days will be necessary to complete our. investigation and to file a final report on.the matter.
s 's d
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