ML20096C179
| ML20096C179 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 08/28/1984 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| OL, NUDOCS 8409050133 | |
| Download: ML20096C179 (16) | |
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.4 PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET P.O. BOX 8699 PHILADELPHI A. PA.19101 (215)841-4502
- JOHN S. KEMPER VDCE PRE $1 DENT AUG 281984 Mr. A, Schwencer, Chief Licensing Branch No. 2 Division of Licensing
. U. S. Nuclear Regulatory Conmission Washington, DC 20555
Subject:
Limerick Generating Station, Units 1 & 2 Information for Materials Engineering Branch (MTEG)
Regarding SER Confirmatory Issue #12 - Preservice Inspection (PSI) Program
References:
1)
Telecon between M. Hum (NRC/MTEB), B. Brown (EGSG Lab.) and D. Schmidt (PECo), 8/17/84 2)
Telecon between M. Htsn/C. Cheng (NRC/MTEB) and D. Sctmidt (PECo), 7/20/84 3)
Letter, d. S. Kemper (PEco) to A. Schwencer (NRC),
dated 7/17/84
Attachment:
Limerick l' nit 1 PSI Relief Request No.15, Rev.1 File:
GOVT 1-1 (NRC)
Dear Mr. Schwencer:
As discussed in the reference 1) and 2) telecons, the attachment provides a revision to Relief Request No. 15.
Originally transmitted by reference 3), Relief Request No.15 has been revised to provide the 1
requested clarification and additional information.
Sincerely,
.)
J.sd DLS/pdO8278402 See Attached Service List
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i 8409050133 840828 PDR ADOCK 05000352 G
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.cc:. Judge Lawrence Brenner (w/o enclosure)
Judge Peter A. Morris (w/o enclosure)
Judge Richard F. Cole (w/o enclosure)
Troy ' B. Conner, Jr., Esq.
(w/o enclosure)
Ann P. '6 i, Esq.
(w/o enclosure)
Mr. Frank R. Ranano (w/o enclosure)
Mr. Robert L.-Anthony-(w/o enclosure)
Maureen Mulligan (w/o enclosure)
, Charles W. Elliot,.Esq.-
(w/o enclosure)
Zort G. Ferkin, Esq.
(w/o enclosure)~
Mr. Thomas Gerusky (w/o enclosure)
-Director, Penna. Emergency (w/o enclosure)
Management Agency Angus R.LLove, Esq.
(w/o enclosure)
David Wersan, Esq.
(w/o enclosure)
Robert J. Sugarman, Esq..
(w/o enclosure)
Martha W. Bush, Esq.
(w/o enclosure)
Spence W. Perry, Esq.
(w/o enclosure)
Jay M. Gutierrez, Esq.
(w/o enclosure)
Atomic Safety & Licensing (w/o enclosure)
Appeal Board Atomic Safety & Licensing (w/o enclosure)
Board Panet Docket & Service Section (w/o enclosure)
Mr. James Wiggins
-(w/o enclosure)
Mr. Timothy R. S. Campbell (w/o enclosure)
- W y
Limerick Generating Station, Unit 1 Preservice inspection Rollef Request ASME BSPV Code,Section XI
'15.
Class 2 Pressure Retal.1Ing Welds in Piping Code item Nos. C2.1 and C2.2, Category C-F y
' Code Requirement Those-pipe circ mferential butt welds and those longitudinal weld Joints in pipe fittings included in Code Category C-F of Table IWC-2520 shall be volunetrically examined per item Nos. C2.1 and C2.2 of Table IWC-2600.
The examinations shall include 100% of the C-F welds and 'shall be performed congletely, once, as a preservice examination requirement.
Table IWC-2520 requires the examination volune to include the weld plus the base metal for distance of one-wall thickness beyond the edge of. the weld.
Relief Request:
Relief is requested from the base metal volune requirement of Table IWC-2520.
Radiography was utillzed as the volunetric examination technique. The examination volum Included the weld plus the base metal for a minimum distance of 4 inch beyond the edge of the weld.
There are 40 circunferential and 80 longitudinal welds associated with 20 Main Steam elbows included in this relief request.
Justification for Granting Relief:
The integrity of the piping pressure boundary has been verffled by construction code testing requirements.
Shop welds were radiographed in accordance with that edition of ASME Section ill In effect at the time of procurement.
Field weld examinations, which include radiography and hydrostatic pressure tests, were performed in accordance with the 1974 Edition of Section !!!
including the Addenda through Winter 1974.
Laminar Indicatlons throughout the base mrrtal of the 20 Main Steam elbows have precluded ultrasonic testing from providing a meaningful Section XI Volumtric examination.
The construction g
radlographs for the welds in question were reviewed and V
additional radiography was perforred to achieve coverage in excess of the requirermnts of the 1980 Edition of Section XI, including the Addenda through the Winter 1981, per Figure IWC-2500-7 (Anticipated Code Edition for IS I Prograr,).
Radiography will be used for subsequent 151.
The preservice volunetric examinations have been augrmnted by ccoolete liquid penetrant tests, which were perfornud in accordance with the 1977 i
Edition of Section XI, including the Addenda through Sunmr 1978.
E
. g Limerick.Generaing Station, Unit.1 Preservice'. Inspection Relief Request ASE BSPV Code,.Section XI
.15.
Additional Infonnation:
T-[
These 20 Main Steam elbows'were fabricated from SA 515 Gr. 70 rolled ~ carbon steel plate with specified design mininun wall
. thickness of.-.928 Inches.. Many of these' elbows exhibit a
.e
' condition of stacked'mid plate Indications, detectable by'00 A longitudinal wave ultrasonic testing (UT). These Indications are
- dispositionedf as a cont >lnation of inninations and planar-non-metallic inclusions throughout the elbow base metal. Though not; rejectable to the appilcable base material' Code testing requirements, this condition limits the effectiveness and conpleteness of the angle beam UT.
The preservice'exanination of the welds in these 20 elbows is divided-Into 120 volunes.= Fifty-six (56) of. the volunes were examined ultrasonically (.0, 45 ax, 45 ' circ).
A. breakdown of the examinations is as follows:
NLsrt)er Conglete 29 Ntsrt>er Incomplete 27 NLsrtzer with Recordable Indications-21 The majority of these UT examinations were perfonned from the
' pipe side due to the laminar indications detected in the elbow
- base metal during the 00 straight beam examination.
When the' decision was made to'use the construction radiographs for the preservice' inspection, ' additional radiography was required to achieve-ASE Section XI, 1980 coverage. Based on an evaluation of the radiographs and the Ilmited UT examinations, it was determined that additional' angle radiography, down the fusion
.line,'would not be of any benefit.:
~
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1 For. Inservice inspection,'both the required volumetric and surface examination willu be 'perfonned.. However, radiography will be'used In lieu of ultrasonic testing. UT will be used for Interrogative purposes when possible when a change.Is noted
.durIng comparison of time baseline radiographs with the subsequent
~
inserv. ice inspection radiographs.
Attached are the UT examination data for two welds.
This
~Information is typical of the condition found in the base metal of the 20 elbows..
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