ML17275A819

Deficiency Rept Re Overstress of Clamp & Rigid Sway Strut of Two Installed Hangers Supporting Pipe Risers,Initially Reported 801215.Review of All Riser Clamp Installations Complete.Design Changes Issued to Correct Installation

ML17275A819
Person / Time
Site:	Columbia
Issue date:	02/05/1981
From:	Matlock R WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
10CFR-050.55E, 10CFR-50.55E, GO2-81-20, NUDOCS 8102120098
Download: ML17275A819 (8)

Text

REGULA kY INFORMATION DISTRIBUTI SYSTEM (RIDS)ACCESSION NBR:8102120098 DOC~DATE!81/02/05 NOTARIZED:

NO DOCKET.¹FACIL:50-397 I'IPPSS Nuclear Project<Unit 2i Nashington Public Powe 05000397 AUTH'AME AUTHOR AFFILIATION MATLOCK~R.G.

Washington public Power Supply System RECIpiNAME RECIPIENT AFFIL',IATION ENGELKEN<R

~H~Region Qr Dal lasr Office of the Dir ector.

SUBJECT:

'eficiency rept re overstress of clamp 8 rigid sway strut of two installed hangers supporting pipe risersginitially reported 801215>Review of all riser clamp installations complete.Design changes issued to correct installation; DISTRIBUTION CODE: B019S COPIES RECEIVED:LTR ENCL'IZE!TITLE: Construction Deficiency Report (10CFRSO~55E)NOTES:PM: 2 copies of all material, 05000397 RECIPIENT ID CODE/NAME, ACTION A/D LICENSNG OQ RUSHBROOK<Me 06 INTERNAL: AD/RC I/IE 17 D/DIR HUM FAC15 EDO 8 STAFF 19 HYD/GEO BR 22.LIC QUAL BR 12'NRC PDR 02 REV 13 G F IL 01~DKV 21 COPIES LTTR ENCL 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 RECIPIENT ID CODE/NAME YOUNGBLOODgB 05 LYNCHgDo 07 ASLBP/J~HARD DIRgDIV OF LIC EQUIP QUAL BR11 I8E 09 MPA 20 OELD 21 QA BR 14 RUTHKRFORDgIlt

~IE COPIES I TTR ENCL 1 1 1 1~1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1<<EXTERNAL: ACRS NSIC 1e 1e 08 1-1 LPDR 03 TOTAL NUMBER OF COPIES REQUIRED: LTTR~ENCL t r B I' Washington Public Power Supply System A JOINT OPERATING AGENCY P.O.BOX 968 3000 GEO.WASHINGTON WAY RICHLAND, WASHINGTON 99352 PHONE (509)372 5000 February 5 1981"'02-81-20 Docket No.50-397 Nuclear Regulatory Commission Region V Suite 202, l4alnut Creek Plaza 1990 North California Boulevard l4alnut Creek, California 94596 Attention:

Mr.R.H.Engelken, Director Gentlemen:

Reference:

MPPSS NUCLEAR PROJECT NO.2 REPORTABLE DEFICIENCY

-10CFR50.55(e)

ONE-SIDED CLAMP LOADING G02-80-301, dated 12/15/80

Subject:

Potential Reportable Deficiency 10CFR50.55(e)

Your staff was previously notified of a"Potentially Reportable" condition regarding a possible noncompliance to ASME III, Section NF, Paragraph 369IC, per the referenced letter.Our evaluation, in accordance with ASME III, Section NF, Paragraph 3610, has concluded that this condition is reportable under the provision of 10CFR50.55(e).

Attached is our final report describing the deficiency, its safety significance and the corrective action to resolve the deficiency.

OII 8102 j pO0't..

0 l I III P~n/r 1 i~

Please contact us if you have additional questions.

L Very truly yours, RGM/RPS/ib Attachment as stated cc: WS Chin-BPA ND Lewis-EFSEC, Olympia RE Snaith-B8R, NY V..-Ste l-l o=-NRCe...'gii',;ZZ r'>R p G~MATLOCK Program Director, WNP-2 AD Toth-NRC Site JJ Verderber-88R, NY E.Wood-NUS Corporation WNP-2 Files I-4l WASHINGTON PUBLIC POWER SUPPLY SYSTEM DOCKET NO.50-397 CPPR-93 WPPSS NUCLEAR PROJECT NO.2 REPORTABLE DEFICIENCY AND CORRECTIYE ACTION ONE-SIDED CL'AMP LOADING PER ASME SECTION III, Nature of De~ficienc:

The investigative action to assure that the WNP-2 hanger design for risers meet the requirements of ASME III, Section NF, Paragraph 3610, has identified a design deficiency that could have resulted in an unsafe condition were it to remain uncorrected.

Two installed hangers, RCC-290 and RWCU-1C-4PS, supporting pipe risers on ASME Section III, Class 1 and 3 system, have been identified and require modification to avoid overstress of the clamp, and rigid sway strut.Safet Si nificance:

The overstress condition in the clamp and rigid sway strut could lead to failure of the hanger and the ASME Code Class pipe it supports.This could impair the ability to operate or take the plant to a safe shutdown condition.

Corrective Action: A review of all riser clamp installations has been completed.

Sixteen (16)hanger installations were identified as having a potential for a load shift.Design changes are beihg issued to correct the installation of the hangers identified above.One hanger has been re-evaluated and found not subject to a load shift.The remaining thirteen (13)hangers having this potential for load shift are being analyzed.Those that are found to require modification will be modified accordingly.

Any new hanger installation involving a configuration that is subject to a load shift will be constructed to withstand the excentric loading required by ASME III, Section NF.

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