ML20149J138
| ML20149J138 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom, Limerick  |
| Issue date: | 07/18/1997 |
| From: | Hunger G PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-96-003, IEB-96-3, NUDOCS 9707280072 | |
| Download: ML20149J138 (11) | |
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- T chilon support Department 3
j _g 10 CFR 50.55a
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'( PECO NUCLEAR A Unit of PECO Energy ecco e"erov comaeev -
965 Chestertwook Boulevard waym oA iocanse91 July 18,1997 l
Docket Nos. 50 277 2
50-278 50-352 l N 50-353 License Nos. DPR J DPR-56 NPF-33 .;
NPF-85 l l
' U. SI Nuclear Regulatory Commission 1 Attn: Document Contr01 Desk ;
Washington, DC 20555 j
Subject:
Peach Bottom Atomic Power Station, Units 2 and 3 )
Limerick Generating Station, Units 1 and 2 l
Submittal of Proposed Attemative to Utilize Code Case N 516-1
Dear Sir:
in accordance with 10 CFR 50.55a(s)(3), attached for your review and approval is a proposed attemative to 10 CFR 50.55a(g) to utilize Code Case N-516-1, " Underwater Welding,Section XI, Division 1" for the Peach Bottom Atomic Power Station (PBAPS), Units 2 and 3, and the Limerick Generating Station, Units 1 and 2 Inservice Inspection (ISI) Programs. A discussion of 4
the basis for this proposed attemative is contained in the attachment. This proposed attemative ,
is first necessary for use in the installatum of the suction strainer modification as required by IE !
Bulletin 96-03, " Potential Plugging of Emergency Core Cooling Suction Strainers by Debris in I ,
Boiling Water Reactors." This modification is currently planned for the upcoming fall outage at f PBAPS, Unit 3. Therefore, we request that this attemative be approved by September 30,1997. j <
if you have any questions, please conta::t us.
f Very truly yours, _
.a. Ap4 G.' A. Hunger, Jr. y Director- Licensing Enclosure oc: ' H. J. Miller, Administrator, Region 1, USNRC .
. W. L. Schmid *, USNRC Senior Resident inspector, PBAPS
.N. 3. Perry, USNfic Senior Re 4 dent inspector, LGG -
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l PROPOSED ALTERNATNE TO ASME SECTION XI CODE REQUIREMENTS
- ' Peach Bottom Atomic Power Station (PBAPS), Units 2 and 3 Limerick Generating Station (LGS), Units 1 and 2 -
l In accordance wth 10 CFR 50.55a(s)(3)(1) and (ii), PECO Energy Company (PECO Energy) requests authorization to utilize an attemative to 10 CFR 50.55a(g) which invokes the l l
requirements contained in specific Editions of the ASME Section XI Code for Inservice Inspection and Repair and Replacement Programs. J
Code Case N-5161, " Underwater Welding,Section XI, Division 1", approved in January 1997 (Attachment A), as an altemative to the Repair and Replacement welding requirements contained in the ASME Section XI Code Editions incorporated by reference in 10 CFR 50.55a(b),
including the 1992 Eddion with the 1992 Addenda of Subsection IWE. The Codes currently '
applicable to the PECO Energy nuclear facilities are the 1980 Edition, including the Wintor 1981 Addenda for Peach Bottom Atomic Power Station (PBAPS), Units 2 and 3; and the 1986 Edition, no Addenda for Limerick Generating Station (1.GS), Units 1 and 2.
Presently, none of the versions of the ASME Section XI Code, incorporated by reference in 10 CFR 50.55a, contain guidance for the performance of underwater welding in conjunction with ASME Section XI Repairs or Replacements. Revision 0 of Code Case N-516 is currently being reviewed for endorsement via Revision 12 to Regulatory Guide 1.147 (Draft Regulatory Guide 4 DG-1050, May 1997). However, this version of the subject Code Case is only applicable for use on P-No. 8 and P-No. 4X materials. Revision 1 of the Code Case extends the applicability to P-No.1 materials as well. Authorization to utilize the guidance provided in Revision 1 of the j subject Code Case will allow PECO Energy to control the performance of underwater welding in accordance with an appropriate industry standard.
Code Case N-5161 is an ASME approved code case (Attachment B) intended to provide an acceptable level of quality and safety when applied to underwater ASME Section.XI Repairs and >
Replacements which PECO Energy will need to perform. Further, use of the Code Case will enable PECO Energy to avoid extreme hardship and unusual difficulties associated with needed ASME Section XI Repairs a.id Replacements. As an example, PECO Energy is currently planning to replace suction strainers at the PBAPS in response to IE Bulletin 96-03,
- Potentia!
Plugging of Emergency Core Cooling Suction Strainers by Debris in Bolling Water Reactors,"
during the upcoming 3R11 outage scheduled to begin in October,1997. Without the attemative
, for underwater welding, it would be necessary to perform welding in air necessitating the draining of the suppression chamber, or drilling and bolting underwater. Draining of the suppression chamber is a complex evolution that would result in the movement of a significant quantity of contaminated water. These options would require additional installation time and increased dose without a compensating 3 crease in safety. These options would also result in a significant financial hardship as s resWt of lost generation due to an extended outage, and additional modification costs. AddR6onally, incidental welding repairs to the suptvession chamber pressure a
boundary may be necessary during the installation of suction strainers which would necessitate it.e use of this code case.
' Authorization to utilize Code Case N-5161 will provide an acceptable level of quality and safety, eliminate hardship and unusual difficulty encountered in complying with current Code requinunents, and enhance the abilky of PECO Energy to perform repairs and replacements of the safety mleted components in Rs nuclear facilities. The Code Case will provide appropriate
' controis over the welding pmcesses which are needed to implement such repairs, replacements, l
. and modifications in a safe and effective manner. l c a i
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Additionally, when applying tHs Code Case to the welding of highly irradiated Class 1 materials, PECO Energy will perform the appropriate qualification testing for such applications per the guidance of Regulatory Guide 1.147 (including draft Revision 12).
Use of the Code Case will be noted on the applicable Code Report Forms for the repairs or
. replacements which are performed utilizing the guidance contained therein.
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CASE'
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- n N-516-1 CAsF5 OF ASME BOILER AND PRESSt;RE VESSEL CODE a- s i!
'T Approval Dr.v: December 31,1996 ,
3ee Nstmr:rcalinde.t hv exporation >
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Case N 51641 quirements'of Section IX for groove welds. The followw Underwater Welding- ing variables also apply.
! Section XI. Division 1 (a) Additional essential vanables:
- (/) a change in the method for underwater trarisport ,
/nquay: What alternative welding methods to those and storage of Alter material (e.g.. from scaled packages required by IWA 4000 may'bc used when repair or to exposed);
replacement of P No.1. P4No. 8, and P-No 4X mate; (2) addition or deletion of waterp;oof or supple- ;
- mentary co%ngs for the filler metal rx'a change in rials are to be, performed underwater?
-+-
~ the tqe of any waterproof or suppicmentary coatings; e Reply? It is the opinior, of the Committee that the (3) a change in depth beyond that'qualifted in ,
, lfollowing ahernative welding methods may be used accordance. with -Table 2.1 1; .
'in lieu of these acquired by IWA-4000 when repair (4) a change in the nominal background gas com.
L or replacernent of P No.1, P-No.? 8 and P.No. 4X positionl; materials' are to be performed underwater. All other (5) for SMAW and FCAW, use of a larger diameter
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applicable requirements of Sect on XI shall be met, electrode than that used in qualification.
(6) For P No. I material, a decrease in the mini-mum d stance fr m the point of welding to the wetted
' 1,0 SCOPE AN11 GENERAL REQUIREMENTS surface in any direction, when the mmimum distance (a) These requinmer.ts8 are for dry or wet underwater is less than 6 inches:
, welding. (7) For P No. I material, the supplementary essen-
. (b) 'The terms and definitions of ANSI /AWS D3.6-89. tial variables of Section IX arply to non impactaested -
3: - " Specification for Underwater Welding" shall be used. base metal when the minimum distance from the poi-nt
-(c) Repair or replacement of P No. 1. P-No. 8, of welding to the wetted surface in any direction is and P-No. 4X materials and associated welds may be (ess than 6 inches.
. perfortned underwater provided the welding procedures (b) Additional nonessential variables:
and welders or welding opentors are qualified in accord. (1) for SMAW and FCAW, an increase in time ,
ance wi& Section IX as modified by para 2.0, 3.0, of electrode exposure to the underwater environment;.
I or 5.0, u applicable, (2) a change in the m.:thod of protecting, removing L
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' (d) Dry underwater welding may be performed with moisture from, or otherwise conditiomng bare filler GMAW GTAW, PAW, SMAW, or a combination of metal and bare electrodes in the underwater envi.
. these processes. ronment.
(e) Wet underwater welding may be performed with GMAW (FCAW type anly), SMAW. or a combination 2.2 Performance Qualification of these processes.
Welders and welding operators for dry' underwa'.er welding shau be qualified in accordance with Section
. 2.0 ' ' ADDITIONAL VARIABLES FOR DitY IX and the variables listed below. When a welder or UNDERWATER WELDING welding operator hu not welded with a process in a
"**"*" "*****I****'N*"
2.1 Procedure Quailfication the qustifications for that underwater process shall
- Welding Procedure Speciticatiom for dry underwater expire.
- l welding shall be qualined in accordance wit the re. (a) A change in welding mode (i.e., dry chamber, dry. spot or habitat).
'8 AN5n/A% $ D) 6 89. "$peoficwo i for Undeiwatee Welding
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4 : tams ad&uonal techmed infremanon that the Ower or mer may- -
&nd useM. Addinona! tanables et controb m.sy te considere6 for 3 6acigmund gas is gas dia 15 places =ser and ts not neces*,anly sper;tfsc applicapons. tmended to shield the arc. De gas may cf may not te bturhable.
J 1011 ' SUPP. 7 - NC j; Anne Nucles.r Code cases fupplement No. 7 ' r.C9507U516 06-27 97 03:024-48
f CAGE (centinund)
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" N-510-1 CMEs OF ASME Pott.ER AN1' FRESsURE VF.SSEt, CODE k
- (b') A chang in the SFA specifics;twn AWS filler polarity) to electrode positive beverse polarity) or
- i. metal clasification, or. if not cor4 forming to an AWS wee versa; s 6!ler metal classification, a change in the manufacture
- s (10) a change from wet backsMe to dry backside i trade reine for the electrodc or 61:er metsi for backing thickness less than % in.
]' (c) Additinn or deletion of supplementary coatings (1/) for P.No. I base metal cart'on equisalents as for the filler metal or 3 (.hange in the type of any calculated in accordance with Eq. (!), an increase in
- - supplementary coatings. .
the carbon equivalent beyond that of the. procedure
. (d) A change in deph beyond that quali6ed in accord- quabacation test coupon;
- nce with Table 2.1 1.
(e) For SMAW and GMAW. use of a larger diancer *
- CE = C +6 & * + '
- 5# * + 0) electrode than that used dunng performancu quali6- 15 i- catwn.
- The cSemical analysis for carbon equivalent calcu.
t lations for the production base material may be obtained from the mill test cenificare or clumical analysisi If y 3;0 ADDITIONAL VARIABLES FOR WET it is not practical to obtain chemical analysis for Cr.
j UNDERWATER WELDING Afo. . P. Ni and Ca. the carbon equiva. lent may be eenn e u ng O Mr se tenn h .L1 Procedure Qualifkaticn
- Welding Procedure Specifications for wet undersater Cr afo + L Ni + Ci
!l welding shall be qualifted to the requirements of Section 5 15 i IX for groove welds' etcept that for P-No. I base
' metals, the supplementary essential variables of Section (12/ an increase in the time of electrode exposure IX apply to non impact-tested base metal. The following to water at qualification depth; variables also apply. ~ (13/ for P-No. I bue materials, a change from (a) Additional essential vanables: multipass per side to single pass per side.
- (/) a change in the method for underwater transport (b) Additional nonessential variables
and stotage of filler materialie.g4 from scaled packages (1) a decnase in included angle, a decrease in
- j. to exposed); root opening, or an increase in root face.
(2) addition et deletien of waterproof or supple- g p g
. mentary coatings for the filler metal or a change m
!- the type of any waterproof or supplementary coatings; Wel&rs and welding operators for wet underwater
! (.1) a change in electrode diameter ieyond the welding shall be qualified in accordance with Section L range used in qualification; IX and the variables listed below. For P.No I base (4) a change in depth beyond that qualified in metals. if mechanical bend testing is attempted in lieu
- accordance with Table 2.11; of radiographic examination and the coupons fail the
- (5) a change in the SFA specification AWS filler requirements of QW-302.1, immediate retesting may I- metal classification, or, if not conforming to an AWS be by radiographic mamination in accordance with
- filter metal classification. a change in the manufacturer's QW 302.2. When a welder or welding operator has l trade name for the electrode or filler metal
- not welded with a process in c. wet underwater environ-
- (6) addition of welding positions other than those ment for at-feast six months, the qualikations for ,
l qualified in accordance with Table 2.1-2; welding with that peccess undetwater shall expire 1 :(7) a change from upward to downward. or vice (a) A change in the SFA specif. cation AWS filler
[
versa. in the' progression specided for any pass of s tr'etal classification (A if not conforming to an AWS vertical weld; filler metal classification, a change in the manufacturer's
-(8) a change from the stringer bead technique to trade name for the electrode or tiller metal.
, gb the w' eave bead techmque, or sice versa. For P-No. 8 (b) Addition or deletion of waterproof or supplemen-
- . y and P-No. 4X base metals, this variable applie[only tary coatings for the tiller metal or a change in the to the vertical position; type of any waterproof or suppiementary ccatings.
- . (9) a change fro n ac to dc. or vice versa
- and.' (c) A change from sah or borated water o fresh
!- in dc we3 ding, a chaw Sm electrode negative (straight water.
$UPP 7 NC 1012 i : Asse Wuclear Code Cases Supplement No. 7 NC9507U516 06-27-97 03:02:48 I
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CASES OF A5* tE BOtt.ER AND PRESStlRF. VESSEL. CODE J
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('d) Use o'f a larger diameter electrode than that used (J) Tbc chemical co.nposition shall meet the appli- )
during performance qualification. cable SFA specification requirements for the as depcs.
- (e) A change in depth beyond that qualified in accoid- ited chemical composition. For material that does not l ance with Table 2.1 1. .
conform to a SFA spacification, the chemical composi-(f) Addition of welding positions other than those tion shall meet the requirements specified in the NPS.
qualified in accordance with Table 2.12. (4) Charpy V-notch absorbed energy shall meet (g) A change in polanty or type of power source the requirements of para. 5.0(c) and, when applicable. ;
(e.g. n:ctder, motor genera:or, inverter). the Construction Code.
(hl' A change from stringer bead to weave technique.
(O A change in welder's view from beneath to above the water surface. 5.0 ALTERNATIVE PROCEDURE (j) A darea.s in the included angle, a decrease in QUALU'ICATION REQUIRE 31ENTS ,
roct opening, or an increase in the root face. (a) As an alternative to the bend test requirements of Section IX. Charpy V notch tests may be used when j 4,0 FILLER StETAL QUALIFICATON qualifying procedures for wet underwater welding of P No. I base rnaterial.
. Each filler metal heat lot, watcrproof coating type.
.(b) Charpy V-notch tests of the weld metal and heat and supplementary coating type to be used in production df & ibh M I shall be tested in accordance with the following require- l be performed at 32F. Number, location, and orientation f the test specimens shall be as follows:
An aiheld metal coupon shall bc prepared using (1) The specimens shal' be removed from a loca.
the production welding pmcedure at a d pth such that n as war as practical to a depth of one half the the depth of the production weld wiP. be within the .
thickness of the deposited weld metal. , Die coupons depth litnitations cf Table 2.1 1.
r HAZ impact specimens shall be taken transverse (1) For material that conforms te an SFA specifi-c . to the axis of the weld and etched to define the HAZ. 1 cation, the coupon shall be prepared n. accordance with he notch of the Chrpy V notch specimen shall be the applicable SFA specincation.
cut 3PProximately nonaal to the material surface m.
(2) For material that does not conform to an SFA such a manner a.t to ir.clude as much HAZ as pessible speci6 cation, the coupon sha!! b1 prepared in accordance in the resu ting fracture. When the material thickness with the SFA specification most nearly matching that meterial (e.g.. for fenitic covered electrodes. SFA 5.1). penmu t I ngigdinal specimen axis shall be perpen-dicular t the fusion hne. ;
(b) ne coupon shall be tested as follows:
(2) The Charpy V-notch tm shall be performed (I) The ferrite number shall be directly measured .
in accordance with SA 370. Specimens shall be in .J for austenitic stainless steel. QW 442 A No. 8 filler accordance with SA MO. Fig.11, rype A. A test shall l gg c nsist of a set of three full size 10 mm x 10 mm (2) One all weld metal specimen shall be tension j g, specimens. De absorbed energy and the test tempera-aure, as well as the orientation and location of the f3) determine as deposited chemical composition
,g
- tests performed, shall be reported in the Procedure ,
shall be determined in accordar.ce with the applicable SFA spcification or the SFA specification most nearly 0"' * " **
(c) The averages of the three weld metal impact enatching that material.
N) For fenitic weld metal Charpy V-notch sb- f*"
- " H "# ".e HAZ impact tests shall each be not j surbed energy shall be determined in accordance with l (d) Charpy V-notch tests of the weld metal are not j para. 5.0(b). and when applicable, the Construction required for austenitic (A-No. 8) or racke!-base (F-No.
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(c) Acceptsace cliteria: i
, . (1) he fenite number shall meet the requirements j of the Constructien Code.
6.0 EXAalINATION I (2) The ultimate tensile strength shall meet the l ruinimum tensde strength specified for either of the When it is impractical to perform the examinations base metals to be joined. required by this Division or '.he Constmr. tion Ccde !
l lui3 SUPP. 7 - NC l Asse Nuclear Code cases Suppleemnt Wo 7 NC9507U516 M-27-97 05:26s 08
A
- i. " CASE (ctntinu d) -
- . . N-516-1 I . ,
CAsLi OF A5ME BOILER AND PRES 5URL VESSEL. CODE
.' . bedause of'the underwater environment,' the following . ance of VT 1 visual exarninations and shall have re-l altertiative requirements apply. ceived additional training in examination of weldments f r fabrication conditions, including dimensional re-
'6.1 L Surface Esamination h .
ge fe t.c. quirements and fabrication llaws.
jg in lieu of'any required [aminaion the following O Volumetric Examination
, apply:
(o) When practical, a surface. examination shall be in lieu of any required volumetric examination, the conducted with an ultrasonic or eddy current surface following apply:
l - examination 1 procedute qualified for the underwater _ (a) When practical. a volumetric examination shall environment. be conducted with an ultrasonic examination procedure. :
5 (b) When ultrasonic and eddy current surface exami- . The ultrasonic examination shall be conducted .n accord-nation is not practical, the surface shdi be visually ance with Section V. Ardcle 5. Indications shall be
- l. examined wide a procedure meeting the requirements evaluated using the volumetric' acceptance criteria of
- of IWA 2200. the Construction Code, Section ', or this Division.
(c) Ultrasonic, eddy current and visual surface indica. (b) When ultrasonic volumetne examination is not tions shall be evaluated using the surface examination practical, a nondestructive surface examination shall be
! , acceptance cnteria of the Construction Code Section performed on the root pass and on the finished weld.
] III, or this Division. When it is impractical to perform a surface examination (d) Pemnnel performing visual examinations shall on either the root or the finished weld, the provisions i be qualifud in accordance with IWA 2200 for perform- of para. 6.1 apply. ;
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CASE (c:ntinu:d)
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e N-516-1 CASES OF ASME SOILER A9 D PRL%CRE VESSEL CODE ,
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4 TABLE 2.11 DEPTH LIMITATIONS FOR UNDERWATER WELDING QU ALIFICATION [Now (1
;f $15 Mat Depth Qualided Min. D-tsth Quahded
[ Note (2)] [Nete (2)] t ~ Dry welding . O plus 33 ft 0 minus 33 ft 8 Wet welding with A No, 8 filler metal O plus 10 ft 0 minus 33 ft Wet we'aieg we F No. 4X filler metal 0 0 mitws J.*, ft J' 'g Wet weiding with o$ee 'Sar A No. 8 anc P.No. 4X hl/r,e estalj 0 ofus 33 ft 0 plus 33 ft CNote tell , NOTE $* , W D is walification test desm.
"j. (2) For tse manimum cepth nualified, decth shall te measured from the lower teremity of the test weldment with a toterance of plus or rnicus
. 1 in.
(3) For tse minimum sectn qualified, depth snail te rneasured from the unser enremity of the test weldment we a tolerance of plus or rninus 9 in_ -
. (4) Welos at dectss less than 10 ft require Qualification of the Dr$duCMn Wei$ *:nimum deDth.
i l ? I. TABLE 2.12 PROCEDURE AND PERFORMANCE QUAllFICATION -TYPE AND POSITION
/) LIMIT / IONS Position and Type of Weld Quahfied (Note (1)]
l Quabcation 1est Plate Pipe I Plate or Pipe Weld Positions Groove . Fillet Groove Fhlet Ptste-qnote % F F F F 2G H H H H 32 V V I 4G 0 0 P;oe-groove 1G F F F F 2G H H H H
;.. $2 F,V,0 , F,V,0 F,V,0 F,V,0 i: , 6G All All All All ken
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- Horilontal y = Verticai 0 = Overhead F
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y' q Tern Reynolds I Global Divers I 5319 Port Road ' 4 New iberia, LA 70%0 1 DearNr Reynoldr 4. l This letter is being sent upon your request :o verify that Section XI Code Case N-516-1 l
.wes approved by the ASME Board of Nucle:r Codes and Standards (BNCS). The letter '
- ballot for approval of this item closed on heuary 7,1997 Approval from the BNCS is the final approval step required for code ca<es pr!ct te publishing. After a code case is l
' approved by the BNCS, it may be utilized immediately, even prior to pnblishing. :
h Ccde Case N-5161 will be published in ASSE Code Cue Suppleraent #7, which should
- ' be available by June 15,1997 If you have tiny further questiens regarding this or any other Secaon XI itetu, please contact mc.
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- Sincerely, f
[ 1 i [ ,_- rgeFec ,
, Secreta y s
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Section XI lL- -(212) 705-3018 i(212)705 8502 FAX. cc: Gary Davis; Limedek Generating Station i-t i 1. i > . i-4 _ .._ TNe ..Ana,;c aniSociety' of M ec can:c al Enginee rs.__
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