ML18030A119

Interim Deficiency Rept Re Small Diameter Pipe Bent in Field,Exceeding Allowable Ovality Tolerance Values.Caused by Bending Method.Criteria Will Be Established for Personnel, Setting Limits for Ovality & Conditions for Acceptance

ML18030A119
Person / Time
Site:	Susquehanna
Issue date:	06/20/1980
From:	Curtis N PENNSYLVANIA POWER & LIGHT CO.
To:
References
PLA-498, NUDOCS 8006270321
Download: ML18030A119 (3)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIBS) ~P! \

ACCESSION'BR:8006270321 'OC ~ DATE: 80/06/20 NOTARIZED: NO 'OCKET FACI ' Susauehanna Steam Electric Stationr Unit lE Pennsylva 05000387 0 388 uszuehanna Steam Electric Station< Unit 2i Pennsylva 05000388 A T ~ I ~ . AUTHOR AFFILIATION CURTIS F N ~ TEI' Pennsylvania Power E Light Co, RKC?P,NA rE RECIPIENT AFFILIATION

SUBJECT:

Interim deficiency rept re small diameter pipe bent in fieldiexceeding allowable ovality tolerance values Caused by ~

bending method, Criteria will be established for personneli setting limits for ovality 8 conditions for acceptance, DISTRIBUTION CODE: B019S COPIES RECEIVED:LTR ~ ENCL TITLE: Construction Deficiency Report (10CFR50.55E) g SIZE:

NOTES:

REC IP IENT COPIES RECIPIENT COPIES ID CODE/NARK LTTR ENCL IO CODE/NAME LTTR ENCL ACTION: ADA/Q L'LC~ 1 BC YYDUDIOIBIRCBQI5 LA ILUBIABIEEO(Alo PMA Q%P, 1.4 INTERNAL: AO/RCI/IE 1 AEOO FDO 8 STAFF 07 1 EQUIP QUAL BR 16 IFLD COOR/ IE13 1 HANAUERgS ~

..1YO/GEO BR 22 1 I8E 05 LIC QUAL BR 1' HOOREpV ~

,,PPA 08 NRC PDR 02 A3KLD 23 OR ASSESS BR 17 4=T= V BR QA BR 10 wEG FILE 01 STANDRDS OEV 11 EXTERNAL: ACRS 24 16 1 LPOR 03 NSIC 04 1 TOTAL NUr" BKR OF COPIES REQUIRFD: LTTR 41 ENCI

TWO NORTH NINTH STREET, ALLENTOWN, PA. 18101 PHONE: (215) 821 5151 NORMAN W. CURTIS Vice Resident.Engineertng & Construction 821-5381 June 20, 1980 Mr. Boyce H. Grier Director-Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 SUSQUEHANNA STEAM ELECTRIC STATION INTERIM REPORT OF A DEFICIENCy ON 0%KITY OF BENT PIPE FOR UNIT 1 & 2 ERs 100450/100508 FILE; 640-4/900-10 PZA-498

Dear Mr. Grier:

This letter serves to confirm information provided by telephone to NRC Inspector Mr. R. Gallo by Mr.. A R. Sabol of, PPaL on April 18, 1980. Duzing that conversation Mr. Gallo- was. advised that the subject condition was under evaluation for zepoztability-under the provisions of 10CFR50.55(e) .

The deficiency involves small diameter pipe which has been bent in the field and which exceeds the ovality tolerance values stated in ASME~ Secti.on III, NB4223.2. The code states that., unless otherwise justified by the Stress Report, the ovality of piping after bending shall not exceed.'8 percent as deterIILined by the formulas (D max D min)

Do Where Do ~ Nomi1Lal pipe outs9.de diameter Dmin ~ Minimum outside, diameter after bending or forming Dmax ~ Madmum outside diameter after bending. or.

fozming For the first: instance detected', Bechtel NCR 5523 was wri.tten to identify steel pipe bends where the ovality exceeded 8%. The bending method four'tainless used was attributed as the cause for the deficiencies. Further investigation by'echtel Field Engineering and Quality Control i.dentified another sixteen small pipe bends on stainless steel piping that exceeded ASME, tolerances.

Bechtel NCR 5674 was written to cover those deficiencies. and has been used golf 5

POWER & LIGHT COMPANY i'ENNSYLVANIA 811088'ro + 7'

Mr. Boyce H. Grier June 20, 1980 to record any other deficiencies of this. nature.

The deficiency has been. formally documented in Bechtel MCAR 1-51.

The deficiency, had it gone undetected, could have adversely affected the safety of operations of the SSES plant..: The piping that has been bent beyond ovality tolerance could lead to a rupture or restrict flow in the control and instrumentation lines for safety systems such as'he:'Reactor Water Level, Reactor Pressure, Residual Heat Removal, Core Spray, HPCI,, RCIC, RWCU, thereby affecting plant safety.

In addressing the deficiency for pipe bends with ovality beyond the established tolerance of 8%, acceptance criteria is being developed for pipe bends, whose cross sectional. shapes are between 8% and 15% of circular (oval). This criteria will be established for use by field personnel and will set the limits for ovality and the conditions necessary for acceptance. The conditions will include cross sectional area, surface conditions and system considerations.

Establishing this acceptance criteria in our opinion constitutes extensive evaluation; to meet the criteria" as defined by 10CFR50.55(e)(1)(iii). Therefore, the- deficiency is deemed reportable under 10CFR50.55(e).

Further, since the details of this report provides information relevant to the reporting requirements of 10CFR21, this correspondence is considered to- also discharge any formal responsibility PP&L may have for reporting in compliance thereto.

A final report of the deficiency and the corrective. action to be- implemented will be available in September,. 1980.

Very truly yours, N W Curtis:

Vice President-Engineering S'onstruction-Nuclear.

PLW mcb

~

cc; Mr. Victor. Stello of'nspection (15)'irector-OfHce 6 Enforcement'"

U. S. Nuclear Regulatory Commission.

Washington, D.C 20555 Mr. G. McDonald, Director Office of Management Information 6 Program Control U. S Nuclear Regulatory Commission Washington, D.C. 20555 Mr. Robert M. Gallo U. S. Nuclear Regulatory Commission P.O Box 52 Shickshinny, Pennsylvania 18655