ML20099E051
| ML20099E051 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 10/31/1984 |
| From: | Hall D ILLINOIS POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 55-83-08, 55-83-8, U-10216, NUDOCS 8411210076 | |
| Download: ML20099E051 (4) | |
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ilLLIN0/8 POWER COMPANY -
U~10216 IP'
-CLINTON POWER STATION, P.O. Box 678. CLINTONi ILLINOIS 61727 l
,e October: 31,.1984' Docket.No. 50-461.
Mr. James G. Keppler Regional Administrator
. Region III-
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U.S. Nuclear Regulatory Commission 799 Roosevelt Road.
Glen Ellyn, Illinois 60137
Subject:
Potential Deficiency 55-83-08.10CFR50.55(e)
Damage to Guard Pipe. Bellows' Assemblies
Dear Mr. Keppler:
Chi June 27, 1983-Illinois Power notified Mr. F. Jablonski, NRC Region III (Ref: IP Memorandum Y-17131,'1605-L, dated June
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29, 1983) of it potentially reportable deficiency-per 10CFR50.55(e) concerning construction damage to guard pipe-bellows assemblies.
This initial-notification was followed by four.(4) interim reports (Ref: IP letter U-10077, D. P. Hall to J. G. Keppler.
dated August 16, 1983; IP letter U-10113,.D.
P.. Hall to J. G.
Keppler dated December 15, 1983; IP letter U-10141, D. P. Hall to J. G. Keppler dated April 12, 1984; and IP letter U-10199, D. P.
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Hall to J. G. Keppler, dated August 22, 1984).
Illinois Power's~
investigation of the above iss~ue is. complete and has determined that the issue does not represent a reportable deficiency under the provisions of 10CFR50.55(e).
This letter is submitted as a final report regarding this potentially reportable deficiency.
Attachment A provides the details of our investigation.
We trust that this final report provides sufficient informa-tion to perform a general assessment of this potential deficiency and adequately describes our overall approach to resolve this problem.
Sincerely yours, i
D.
. Hall Vice President RLC/cbs (NRC2) cc:
NRC Resident Office Director - Office of I&E, USNRC, Washington, DC 20555 Illinois Department of Nuclear Safety
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PDR ADOCK 05000461
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ii ATTACHMENT A
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Illinois Power Company Clinton Power Station 4
-D' Docket No. 50-461
=
5E Potential Deficiency 55-83-08 10CFR50.55(e)
[
Damage to Guard Pipe Bellows Assemblies
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Final Report A
i (Uithdrawn)
Statement of Potentially Reportable Deficiency
';;n guard pipe bellows assemblies used at Clinton Power Ten (10) were damaged during installation and construction Station (CPS) scratch-This damage consists of small dents, nicks, and arc strikes, with one (1) assembly exhibiting a small 5
activities.
hole in one (1) of the two (2) bellow plys.
An evaluation of es, 4.
this issue was performed to determine the consequences of this
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damage and necessary actions to make the bellows acceptable.
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Background
A 6
During installation of the guard pipes and associated bellows assemblies, eleven (11) Nonconformance Reports (NCRs) o M
were written to document cases of damage to ten (10) of eleven (11) bellows assemblies.
Thece bellows assemblies, anchore? to act as a seal the drywell wall and welded to the guard pipe, i
isolating the drywell environment while allowing free axial The bellows thermal and seismic movement of the guard pipe.
A assemblies are not pressure retaining parts of either the reactor The bellows assemblies were fabri-
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or the primary containment. tested, und certified in accordance with the ASME Code,
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- cated,Section III, Subsection NE (Class MC), to take advantage of available code specifications.
The original supplier of the bellows assemblies is no longer in this type of business.
g Investigation Result / Corrective Action 2
5 An evaluation of this problem was performed to determine the
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remedial actions necessary to establish the acceptability of the Several methods were pursued, which included y
damaged bellows.
testing of a prototype bellows assembly and repair of the present-i Pathway Bellows, Inc., was awarded the ly installed bellows.to perform testing of the prototype bellows assemblies j
and to supervise repairs, if required.
The classification of the contract bellows assemblies was revised from ASME to ANSI B31,1 to facili-
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the bellows assemblies have retained tate any repairs; however, seismic Category I classification, and their safety related, i
the requirements of 10CFR50, Appendix B.
materials must meet 29 to Section 3.2.1 of the FSAR was changed through Amendment indicate the reclassification.
Page 1 of 3 i
1 ATTACHMENT A-(continued)
A three (3) convolution prototype bellows assembly was manufactured by Metal Bellows Corporation per Sargent & Lundy Specification K-2871 and delivered to Pathway Bellows, Inc.
for testing in accordance with S&L Specification K-2871A.
(S&L)
The prototype bellows was damaged in a manner to duplicate d at CPS.
the damage existing on the bellows assemblies installe The prototype bellows was welded in a manner that simulates the repair that will be made to bellows assembly IFUO4MB due to a hole in the outer ply of the bellows caused by an are burn.
The prototype assembly was tested by imposing greater than
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Leak detection monitors 10,000 cycles of calculated movement.
located between the plys of the pressurized assembly indicated noThis loss of pressure integrity.
Code case N-315 (which was used as a guideline) and proves the method of repair welding to be valid.
The patch material that will be utilized to repair the The installed assembly must be SA240 type 321 stainless steel.
material used by Pathway Bellows to patch the prototype hole had (CMTR), but the CMTR was not
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a Certified Material Test Report provided from an ASME qualified supplier, therefore this material Louis Testing Laboratories (Ref:
P.O.
was requalified by St.
C47712) for physical and chemical analysis.
A representative from Baldwin Associates Quality Engineering group was present to The material qualified as SA240 Type 321 witness the testing.
stainless steel and will be under the control of the Baldwin' Associates Quality Control (BAQC) Material Control Department.
The material will be issued to the Pathway Bellows personnel who the CPS site.
will make the necessary bellows repair av Pathway Bellows has issued their report for the test program S&L has accepted the test report and of the bellows assemblies.
has stamped it Status 1.
Two (2) of the ten (10) bellows will require rework.
Assembly 1FWO4MB will have the small hole patched /walded (NCR Assembly IFWO4MA has an arc strike that will be 5631).
blended / buffed out.
Pathway Bellows personnel will effect the repairs at CPS.
They will utilize their welding procedure T8-8, Rev. 9 forS&L has previous welding P8 to P8 material.
It is procedure for use in the testing of the prototype bellows. an completed by December 15, 1984.
the installed bellows assemblies
.To prevent further damage, have been covered with protective coverings.
Page 2 of 3
ATTACHMENT A (continued)
Safety Implications / Significance
& Lundy to perform an Illino:'s Power requested Sargent lies to engineering evaluation of the damaged bellows assemb determine the significance to safety had the conditions goneThe scratches and dents would not have uncorrected.
The blies, demonstrated that impacted the design performance of the bellows assemblics.the inner ply o prototype testing also demonstrated thatto retain its pressure sealing integrity IFWO4MB was sufficient when subjected to design conditions.
& Lundy has concluded that the existence of dents, nted scratches and the small hole mn 1 ply would not have prese Sargent he damage any condition adverse to the safe operation of CPS had t gone uncorrected.
Investigation of this potentially reportable issue isIllinois P findings of this investigation and has determined that no signifi-complete.
conditions adverse to the safety of operations of CPS werereportable this issue is considered to be not cant found.
Therefore, under the provisions of 10CFR50.55(e).
Page 3 of 3
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