ML20099E051

Final Rept of Potential Deficiency 55-83-08 Re Damage to Guard Pipe Bellows Assemblies.Initially Reported on 830627. Item Not Reportable Per 10CFR50.55(e)

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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~4F.130 e U~10216 ilLLIN0/8 POWER COMPANY -

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-CLINTON POWER STATION, P.O. Box 678. CLINTONi ILLINOIS 61727

,e October: 31,.1984'

_ Docket.No. 50-461.

Mr. James G. Keppler Regional Administrator

. Region III- ~

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.

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

-INPO Records Center 8411210076 841031 PDR ADOCK 05000461

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i ATTACHMENT A ~

Illinois Power Company ,

Clinton Power Station 4 Docket No. 50-461

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5E Potential Deficiency 55-83-08 10CFR50.55(e) [

Damage to Guard Pipe Bellows Assemblies -~4 i

Final Report A i

Statement of Potentially Reportable Deficiency (Uithdrawn) ';;n Ten (10) guard pipe bellows assemblies used at Clinton Power

• were damaged during installation and construction "

Station (CPS) This activities. damage consists of small dents, nicks, scratch- 5 es, and arc strikes, with one (1) assembly exhibiting a small hole in one (1) of the two (2) bellow plys. An evaluation of 4.

this issue was performed to determine the consequences of this {

damage and necessary actions to make the bellows acceptable.

i Background A 6

During installation of the guard pipes and associated o bellows assemblies, eleven (11) Nonconformance Reports (NCRs) M were written to document cases of damage to ten (10) of eleven Thece bellows assemblies, anchore? to (11) bellows assemblies. act as a seal the drywell wall and welded to the guard pipe, i isolating the drywell environment while allowing The freebellows axial  ;

thermal and seismic movement of the guard pipe. A assemblies are not pressure retaining parts of either the reactor  ?

The bellows assemblies were fabri- S or the primary containment. tested, und certified in accordance with the ASME Code, 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 }y remedial actions necessary to establish the acceptability of the damaged bellows. Several methods were pursued, which included ,

testing of a prototype bellows assembly and repair of the present-Pathway Bellows, Inc., was awarded the i j

ly installed bellows.to perform testing of the prototype bellows assemblies 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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tate any repairs; however, the bellows assemblies have retained -

their safety related, seismic Category I classification, and i materials must meet the requirements of 10CFR50, Appendix29B.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 (S&L) Specification K-2871 and delivered to Pathway Bellows, Inc.

for testing in accordance with S&L Specification K-2871A.

The prototype bellows was damaged in a manner to dduplicate 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 10,000 cycles of calculated movement. Leak detection monitors ~

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.

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material used by Pathway Bellows (CMTR), to patchbut thethe prototype hole had CMTR was not a Certified Material Test Report provided from an ASME qualified supplier, therefore this material P.O.

was requalified by St. Louis Testing Laboratories (Ref:

A representative C47712) for physical and chemical analysis.

from Baldwin Associates TheQuality Engineering material group qualified as SA240 wasType present 321 to witness the testing.

stainless steel Associates andControl Quality will be(BAQC) under Material the control of the Control Baldwin' Department.

The material will be issued to the Pathway Bellows personnel who will make the necessary bellows repair av the CPS site.

Pathway Bellows has issued S&L hastheir report for accepted thethe test test program 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 5631). Assembly IFWO4MA has an arc strike that will be 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 previousl welding P8 to P8 material. It is procedure for use in the testing of the prototype bellows. an completed by December 15, 1984.

.To prevent further damage, the installed bellows assemblies 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 uncorrected.

blies, demonstrated that scratches and dents would not have The 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.

Sargent

& Lundy has concluded that the existence of dents, nted scratches and the small hole mn 1 ply would not have prese he damage any condition adverse to the safe operation of CPS had t gone uncorrected.

Investigation of this potentially reportable issue isIllinois P complete.

findings of this investigation and has determined that no signifi-cant conditions adverse to the safety of operations of CPS werereportable found. Therefore, this issue is considered to be not under the provisions of 10CFR50.55(e).

Page 3 of 3

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