ML20086J690

Vol Control Tank to 77 to Charging Pump Suction

ML20086J690
Person / Time
Site:	San Onofre
Issue date:	06/25/1995
From:	Castello T SOUTHERN CALIFORNIA EDISON CO.
To:
Shared Package
ML20086J679	List: ML20086J676 ML20086J690
References
GL-90-05, GL-90-5, M-1208-007-03A, M-1208-007-03A-R00, M-1208-7-3A, M-1208-7-3A-R, NUDOCS 9507190183
Download: ML20086J690 (26)

Text

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Southrrn Californli Edisen Company CALC NO. ICCN NOJ PAGE TOTAL NO. OF PREUM. CCN NO, N-1 1 PAGES M./20 8 0 07- o"3 A

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b'  ! UNIT CCN CONVERSION CALC.REV.

CALCULATION CHANGE BASE CALC. REV. Q 3 CCN NO. CCN-NOTICE (CCN)

COVER PAGE CALCULATION

SUBJECT:

\/o C gv14 y o l % !c T O 7 7 TO Cl.org th THHY3 % C h o'on CALCULATION CROSS-INDEX ENGINEERING SYSTEM NUMBER / PRIMARY STATION SYSTEM O-CLASS Edew/ Updated index included 77 O Existing Index is Complete DESIGNATOR l2./8 / 368 ._

CONTROLLED PROGRAM OR PROGRAM / DATABASE NAME(S) VERSION / RELEASE NO.(S)

DATABASE ACCORDING TO O ALSO, USTED BELOW

l. BRIEF DESCRIPTION OF ICCN/CCN: O PROGRAM O DATABASE Tlic. purpose o? 4 his SMPP l ePCE IS *b0 aclbcss & problem 00 l4glein thro h ctcrac/c in line num her S312.Ig ML. 03) upsfreem of C h e C I' v a l V e- S312 C' Ef M U 083 f%cbre mcc lwnics anglfSy was perbrmesl per Genna. L elle, 90-o4 to % ,sj ,y

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INITIATING DOCUMENT (DCP, FCN, OTHER) tJ c R 4506007h Rev.

2. OTHER AFFECTED DOCUMENTS (CHECK AS APPLICABLE FOR CCN ONLY);

O YES MO OTHER AFFECTED_ DOCUMENTS EXIST AND ARE IDENTIFIED ON ATTACHED FORM 26-503.

3. APPROVAL: DISCIPLINE / ESC: CML/ PLANT DESIGN Nabil M.El-Aldl ylNmfon/11/95 l

l ORIGINATOR (Print name/ initial /date) n & c.(1.tl9r GS Signature /date) OTHER (Signature /date) l 100 a m Is.c. Ic tw/s c IRE (Print name/ initial /date)

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OTHER (Signature /date)

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4. ASSIGNED SUPPLEMENT ALPHA DESIGNATOR: F CONVERSION TO CCN DATE 0!W MA 88

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ICCN NOJ CALCULATIONTITLEPAGE PRELIM. CCN NO tb I PAGE 1 OF CCN CONVERSION:

Ccic. No. M-12 0 3 - 0 D7- 03 A DCP/FIDCN/FCN No. & Rev. d[4 CCN NO. CCN-Yol OnbfD l I*

• Sheet fI ofF'i$

Sub)ect I~0l? IT) Ob Q r[* *" A @** *f SC bion System Number / Primary Station System Designator I 2 I #8 / 6 C' b SONGS Unit 3 Q-Class b Tech. Spec. Affecting? dO O YES, Section No. Equipment Tag No.

l CONTROLLED PROGRAM / DATABASE NAME(S) VERSION / RELEASE NO.(S)

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G M/ O DATABASE DATABASE ACCORDING TO SO123-XXIV.S.1 RECORDS OF ISSUES REV.

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PREPARED APPROVED DISC. ggfg (Print name/ initial /cate) (Signature /date)

INITIAL ISSUE /F ORIG, p e< E/ Other F46 Nabil M. El-Akily t/2t/gg (e .

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ORIG. GS Other IRE DM Other r ORIG. GS Other IRE DM Other ORIG. GS Other IRE DM Other Space for RPE Stamp, identify use of an alternate cale., and notes as applicable.

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l This cale. was piepared for the identified DCP/FCN. DCP/FCN completion and turnover acceptance to be verified by receipt of a memorandum directing DCN Conversion. Upon receipt, this calc. represents the as built condition. Memo date by l

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SCE 26 424 FEV.1 a/94 [

REFERENCE:

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CALCULAYdkbHEET ~

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Project or DCP/MMP SONGS 2 & 3 . tait so. r. c.of- 0o 7 - 3 A ccN No. tcN -ek ,

subjen See Title Sheet Shett No. F3 aEv cRic2 NATOR CATE 1RE CATE OR]G]NATOR CATE 1RE DATE l REY D NABIL M. EL.AxitY 06/21/55 l

l TABLE OF CONTENTS ,

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I Sheet Number 1

CALCULATION TITLE SHEET . . . . . . . . . . . . . . . . . F-1 CALCULATION CROSS REFERENCE . . . . . . . . . . . . . . . F-2 TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . F-3 1 PURPOSE . . . . . . . . . . . . . . . . . . . . . . . . . F-4 i

2 RESULTS/ CONCLUSIONS p ................... F-4  ;

3 ASSUMPTIONS . . . . . . . . . . . . . . . . . . . . . . . F-5 4 DESIGN INPUT . . . . . . . . . . . . . . . . . . . . . . F-5 1 5, METHODOLOGY . . . . . . . . . . . . . . . . . . . . . . F-7 6 REFERENCES . . . . . . . . . . . . . . . . . . . . . . . F-8  !

7 NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . F-8 8 CALCULATIONS . . . . . . . . . . . . . . . . . . . . . . F-9 APPENDIX A REFERENCE MATERIAL . . . . . . . . . . . . . F-12 I i

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i P

SCE 26-426 NEW 4/90

NES&L DEPARTMENT Supplem@nt F CALCULATION SHEET .

=icN ,,. .., ,m s ,

CCN CONVERSION Project er DCP/MMP SONGS 2 & 3 cale No.@'9#8 ' ##Y ' #M CCN h0. CCN - y subject See Title Sheet Sheet No. P- >

I REV CRIGINATOR CATE IRE CATE REY ORICINATOR DATE- IRE CATE D NAt!L M. EL AKILY 06/21/95 ff (, y l

1 PURPOSE / BACKGROUND The purpose of this supplement is to demonstrate the structural integrity of line number 531218ML" 1, Boric Acid Makeup (BAMU) discharge line to charging pump suction, in view of the through-wall crack found in the line. The leaking was found upstream of check valve 531208MUO83 in charging pump 3P191 valve room, as described in the nonconformance report (NCR) number 95060074.

Subsequent NDE examination using visible dye method (Reference 3) showed that the through-wall crack is 9/16" long, and lies at the toe of the support strap-to-pipe fillet weld. A detailed description of the crack location and the NDE results can be found in Section 4 of this supplement.

2 RESULTS/ CONCLUSIONS ,

Linear elastic fracture mechanics analysis was performed, per the methodology of Generic Letter 90-05, on the through-wall crack found in line number 531218MLO31. Results of the analysis show that for a maximum crack length of 1%", the calculated stress intensity, Ki , is Kr = 28.68 ksi/ inch < Kje (critical stress intensity factor) [0.K.]

where Kic = 135 ksi[ inch for the pipe material per Reference 2.

The crack initiated at the toe of the support strap-to-pipe weld and propagated to a length of 9/16". The shape and the orientation of the crack indicate that it was initiated due to local bending in the pipe wall adjacent to the toe of the fillet weld. The high stress due to this local bending should be confined to the area close to the weld; and stresses should decrease rapidly to the nominal value away from the weld, which causes crack arrest.

Based on the wide margin existing in the stress intensity factor , it is concluded that brittle failure will not occur, and structural integrity of the piping will be maintained. The pipe will be replaced by a thicker pipe per

• disposition of NCR 95060074 in the next available outage.

Results of this supplement can be used to disposition NCR 95060074.

l SCE 26426 NEW 4/90

NES&L DEPARTMENT Suppl:m:nt F CALCULATION SHEET l :, & ,. N., ,m e o, CCN CONVIRSION Project or DCP/MMP SONGS 2 & 3 Calc No. M-i2 o y oo 7-03 A CCN No. cCN -

subject See Title Sheet sheet No. PI Cp!G1hATOR DATE IRE CATE REV ORIGINATOR DATE 1RE CATE REV D NABIL W. EL.AKILY 06/21/95 [ 6 .,,  %.g (

3 ASSUMPTIONS None required.

4 DESIGN INPUT 4.1 Pioina General Data and Material Properties Line number  : S31218MLO31 upstream of check valve 531208MUO83 Unit :3 (Reference 5)

Quality Class  : II (Reference 5)

Seismic Class :1 (Reference 5)

Project Class  : D (ASME Code Class 3) (Reference 5)

Pipe Size  : 3"

• Schedule  : 10S Nominal wall thickness (t)  : 0.12"

0.105" based on 12.5% reduction in the Minimum wall thickness nominal thickness due to manu (t,y) facturing tolerance.

Design Pressure  : 150 psi (Reference 5)

Ope. rating Pressure  : 100 psi (Reference 5)

Design Temperature  : 175'F (Reference 5)

Operating Temperature: ambient (Reference 5)

Material  : SA376GRT304 ____ (Reference 5)

Allowable stress Intensity (K3c): 135 ksilinch (Reference 2)

Bounding Equation 90 stress: 9.793 ksi per Supplement A of this calculation 1

- l 4.2 Flaw Description

• \

Figure 4.1 shows a sketch of the through-wall crack based on the l nondestructive examination results (Reference 3). The figure shows the crack-initiating at the toe of the strap-to-pipe fillet weld and extends 9/16" in the direction shown. ,

SCE 26-426 NEW 4/90

NES&L DEPARTMENT Supplement F CALCULATIO.N SHEET  ;;;", & ,. .., ,,, 7 ,,

CCN CONVIR$10N Froject or DCP/HKP SONGS 2 & 3 cele so.M- l10 Y- 0 07- 0 3A CCN so. cCN - t[A subject See Title Sheet 4 Sheet No. F6 REY ORIGINATOR CATE 1RE CATE ORIGINATCR DATE 1RE DATE l REY y a Nisit u. Et. nztv os/21/es pc. %f 3 j -

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figure 4.1 Characterization of Through-Wall Crack in the Pipe -

(Reference 4) s SCE 26-426 NEW 4/90 ,,

NES&L DEPARTMENT Suppl:m:nt F CALCULATION SHEET =LO. .., ,.x y 0, rroject or DCP/MMP SONGS 2 & 3 c 1c so.N' d ' N  !! CCN -

sheet No. F- 7 subject See Title Sheet OR101NA70R DATE. IRE DATE CATE IRE CATE REY REV ORIGINATOR D NABIL M. EL.AKILY 06/21/95 [.[, Ygg '

5 METHODOLOGY To demonstrate crack stability, fracture mechanics analysis of a pipe with a through-wall circumferantial crack was performed. A bounding value for the Design Basis Accident (DBA) stress in the pipe wall was conservatively used, and the methodology of Generic letter 90-05 (Reference 1) for evaluating a through-wall flaw stability is used to perform the analysis. This methodology, based on linear elastic fracture mechanics (LEFM), can be used to calculate the stress intensity factor K3 as follows:

K = 1.4 s F (3.1416 a) 5 (1) 3 The stress, s, in the pipe wall is s - Code Equation 9, Level D stress obtained from Supplement A of the calculation. No, thermal expansion stress is included since the pipe operating temperature is equal to ambient temperature.

~

Equation (1) has a factor of safety (FS) of 1.4.

The geometric factor "F" is F=1+Ac5+Bc'5+Cc5 2 3 where c = a/(3.1416 R)

R - mean radius of the pipe 3

A = -3.26543 + 1.52784 r - 0.072698 r2 + 0.0016011 r B - 11.36322 - 3.91412 r + 0.18519 r' - 0.004099 r' C = -3.18609 + 3.84763 r - 0.18304 r2 + 0.00403 r = R/te, The minimum wall thickness, te,,, is obtained from the nominal pipe wall by ,.

reducing it by 12.5% to account for manufacturing tolerance.

SCE 26-426 NEW 4/90

NES&L DEPARTidENT Tupp%msnm CALCULATION SHEET =",ric,,0. N., ,m q ,,

CCN CONVERSION project or DCP/MMP SONGS 2 & 3 Cale wo. H-w f

• e1- 3 A CCN No. CCN -h subject See Title Sheet sheet No. FE 1RE CATE DRIGINATCR DATE 1RE CATE CATE REV OR]GINATOR l REV D NABIL M. [L Ax!LY DE/21/65 f, [, 4s g 6 REFERENCES

1. ASME Boiler and Pressure Vessel Code, Subsection ND, Code Year 1974 through Summer 1974 Addenda.

2. Generic Letter 90-05,

Subject:

Guidance for Performing Temporary Non-Code Repair of ASME Class 1, 2, and 3 Piping, June 15, 1990.

3. Nonconformance Report (NCR) number 95060074.

4. Report number 3PT-048-95, Nondestructive Examination Report, June 20, 1995.

(A copy is attached in Appendix A)

5. Document number 90002, Line Designation List, Revision 81.

7 NOMENCLATURE ,

a = half crack size, inch 0, - pipe outside diameter, inch Ki = stress intensity, ksi/ inch Rjc = critical stress intensity, ksi/Eh R = pipe mean radius, inch s = stress in the pipe wall, ksi FS = factor of safety t = nominal pipe wall thickness, inch ,

ten = minimum pipe wall thickness, inch

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SCE 26-426 NEW 4/90

NES&L DEPARTMENT Suppbm:ntIF CALCULATION SHEET l :n NO. .., ,Rx , o 0, CCN CONVERSION SONGS 2 & 3 calc no. H-s w g -oo M A CCN NO. CCN - ,

Projset er DCP/MP l See Title Sheet sheet No. F- 9 subject ORIG 1hATOR CATE 1RE DA1E CATE 1RE CA1E REV REV CRICINATOR D NABIL W. EL-AKILY DE/21/95 p(,, C/,v)9[

8 CALCULATIONS  !

The stress intensity factor, Ki , was calculated as a function of half the l crack length, a, using the methodology explained in section 5. The calculations can be summarized as follows: t outside diameter (0,) - 3.5" wall thickness (t) = 0.12" i I

mean radius (R) - (3.5-0.12)/2 - 1.69" constant (r=R/t,an) - 1.69/0.105 = 16.0952 The constants A, B and C are given by A - -3.26543+1.52784(16.0952)-0.072698(16.0952)?+0.0016011(16.0952)'

- 9.1685 ',

9 8 - 11.36322-3.91412(16.0952)+0.18619(16.0952) -0.004099(16.0952) 1

- -20.4928 C = -3.18609+3.84763(16.0952)-0.18304(16.0952)2+0.00403(16.0952)3

- 28.1281 It follows that a 3 F - 1 + 9.1685 c 5 - 20.4928 c .s + 28.1281 c 5 2

where c - a/(3.1416 R) - a/5.3093 )

Therefore, l

F = 1 + 9.1685(a/5.3093)l5 - 20.4928(a/5.3093)'5 + 28.1281(.a/5.3093)'5 3" -

1 l

Finally, the stress intensity factor is given by Ki = 1.4 s F (3.1416 a) 5 i

SCE 26-426 NEW 4/90 l

1- ~

NES&L DEPARTMENT Suppl:m nt F CALCULATION SHEET n; % ,. .., ,xn.

CCN CONVER$10N Project or ocP/mP SONGS 2 & 3 ca1e no. ti-tw3-M7 4 A CCN h0. CCN - Cb subject See Title Sheet sheet No. F 10 1RE DATE ORIG]NATOR DATE 1RE DATE lREv ontciwATcR CATE l REV lo NABIL M. EL.AKILY 06/21/95 f~ 6 . fQ l

where  !

I s - Equation 9D stress 4

= 9.793 WSt l where Equation 9D stress - 9.793 ksi per Reference 3. Results are summarized in Table 8.1, and plotted in Figure 8.1.

Table 8.1 Stress Intensity Factor vs Half-Crack Length Half Crack length (a) Stress Intensity Factor (K)i inch ksi/ inch 0.05 5.48 0.10 e 7.86 0.15 -

9.80 ,

0.20 11.54 0.25 13.18 0.30 14.76 0.35 16.31 0.40 17.84 0.45 19.37 0.50 20.90 O.55 22.44 0.60 23.98 0.65 25.53 0.70 27.10 0.75 28.68 0.80 30.28 0.85 31.89 0.90 33.52 0.95 35.16 ,

1.00 36.83 ,

1.05 38.51 1.10 40.22 1.15 41.95 1.20 43.71 -

1.25 45.49 .

Based on the above table, the stress intensity factor, K i , corresponding to a crack length of 1%" is 28.68 ksilinch.

SCE 26-426 NEW 4/90

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APPENDIX A  ;

REFERENCE MATERIAL i

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SCE 26-426 NEW 4,90

NES&L DEPARTMENT Supplement F CALCULATION SHEET ="a NO . .4 ,. , + 0, CCN CONVER$10N Project or DCP/mP SONGS 2 & 3 cele No. H-lWF '*T ') A CCN hD. CCN -

saject See Title Sheet Sheet No. f- lh CATE 1RE CATE OR]G]NA10R DATE 1RE CATE REV DRIGINATOR l REY D NABIL M. EL.AKILY 06/21/95 -y g , fuggl l l l c:

item 1 NDE Results 2

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SCE 26426 NEW 4/90

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06/21/95 12:58 3714 366 C085 SCE QA0 @ 002 SOUTHERN CALIFORNIA EDISON NONDESTRUCTIVE EXAMINATION DATA REPORT PE pp.cE 1 or 2 sewNETRANT etDam arv. .A stDE REPORT hD. haot:WC h0. bCR OR CTHf.A DOCUhtDiT he. DATE 3PT-048-95 ENG REQUEST N/A June 701995 frtM PC3PCCTID UNifAOCATION E2121sMLc21 STRAP WELD itCCATION RADWA$TE 9' FtM.107H INSPECT 10N PADCDURE Rr# Wo. ACCEPT ANC E ETMD Ae uATemALTrPt suasAes Cohomog NDEP-PT 001 6 rus. nw u.Tio., SISTEEL BUFFED WLD P.Pt P.Af t CTHERS SJ8tfACE TtWP TtMP CAGE h3. PRE C'. TAN WrTHOD PCS'T C2. TAN WI"*s403 X X N/A m 70 w.* Tis SOLV mT SOLVENT PptTRATIO4 Twt CivtuopurwT Tiwt SLAct uodT ho. h.M m v6ao INT ENWTf vv wr7f.M ww.

NA iMTE uit:UTE "

1 fJ/A N/A .w, N/A X VISIBLE DYE fAETHOD N/A FLUORESCENT DYE TAETHOD CLEANER PENETRANT REMOVER DEVELOPER BRAND MAGNAFLUX NA MAGNAFLUX rAAGNAFLUX T/PE SKC NF NA SKC-NF SKD-NF 93F07K NA 93F07K 91K02P BATCH NO. j 3029 93 NA 3029 93 0463-92 RIP /RSO NO.

EXAMINATION RESULTS N/A ACCEPTED N/A REJECTED REMAP.KS; ofwATioN 70 TwI sTmcAc noccovRt.:A on'tLCPER s;ct itsT was Pcmsowrp AC DaRECTED ev THE Lnc111.

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06/81/95 12:58 @714 368 6055 SCE QA0 @ 003 I SOUTHERN CALIFbRNIA EDISON NDE REPORT NO.

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PNCR PAGE 1 NONCONF0RMANCE REPORTING SYSTEM NCR : 95060074 00 STATUS : 40-DISPOSITION APPROVED PRINTED : 06/29/95 12:42

• • • • GENERAL INFORMATION ****

EQUIPMENT ID  : NMEL S31218MLO31 SYSTEM: BGB QUAL: 2 CONST. CODE  : ASME III-3 EQ: N FIRE PROT: N SECURITY: N UNIT  : 3 AREA: RB ELEV: 009 ROOM: 107H COLUMN: N/A DESC  : BAMU PUMP DISCHARGE LINE TO CHARGING PUMP SUCTION DRAWING REF  :

TECH SPECS  : 3.1.2.2 3.1.2.6 ASSOC MO -

REPORTED BY  : KEVIN FLYNN DATE: 06/19/1995 TIME: 12.26.26 COG ENGINEER:  : BLAKE, JOE PAX  : 89159 MODE RESTRAINT : 0 TECH SEC CDE: A12 ITEM OPERABLE  : D RCTS ITEM  :

REPORTABLE  : N HARD COPY  : N GENERIC REWORK : N COPE ITEM  : N ROOT CAUSE ONLY: N PART 21 RPT : N ACE /ANII REVIEW: Y HOLD TAG  : N INIT ROOT CAUSE: N INIT RC MODE:

DISP DUE DTE: 07/03/1995 VALIDATED BY  : FLYNN, KEVIN D DATE: 06/19/1995 TIME: 12.31.42 NOTIFICATIONS  : LISITZA, MIKE DATE: 06/19/1995 TIME: 12.31.25

• • • • NCR DESCRIPTION ****

BAMU PUMP DISCHARGE LINE IS LEAKING AT PIPE SUPPORT UPSTREAM OF CHECK VALVE S31208MUO83 IN CHARGING PUMP 3P191 VALVE ROOM.

THIS LINE IS THE COMMON BAMU PUMP DISCHARGE TO THE CHARGING PUMP SUCTION.

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PNCR PAGE 2 NONCONFORMANCE REPORTING SYSTEM NCR : 95060074 00 STATUS : 40-DISPOSITION APPROVED PRINTED : 06/29/95 12:42

• • • • OPERABILITY ASSESSMENT ****

SEE "SE" PAGE FOR SAFETY EVALUATION SUPPORTING INTERIM ACCEPT-AS-IS DISPOSITION AND BASIS FOR OPERABILITY.

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PNCR PAGE 3 NONCONFORMANCE REPORTING SYSTEM NCR -

95060074 00 STATUS : 40-DISPOSITION APPROVED PRINTED : 06/29/95 12:42

• • • • DISPOSITION INFORMATION ****

l DISPOSITION TYPES: ACCEPT AS IS - X REPAIR -X COND RELEASE -

l REWORK -

INVALIDATE -

REJECT -

PREPARED BY  : ROBERTS, DWAYNE E APPROVED BY  : Y FLYNN, KEVIN D DATE: 06/21/1995 TIME: 14.31.00 Y QASHU, RIYAD 06/21/1995 14.58.00 Y MEICHLER, AL 06/21/1995 15.01.00 i Y GARTLAND, GERARD W 06/21/1995 15.07.00 j Y THOMPSON, CHARLES 06/21/1995 15.24.00 SUPPLE APPROVERS: DATE: TIME:

DISAPPRVAL RMRKS:

DISP STEP: 1 *** DISPOSITION STEP ***

STEP 1: INTERIM ACCEPT-AS-IS REPAIR WILL BE COMPLETED DURING THE CYCLE 8 REFUELING OUTAGE. BAMU LINE S31218MLO31 IS OPERABLE BASED ON EVALUATION IN ACCORDANCE WITH APPLICABLE CODE CONSIDERATIONS. AS PROVIDED IN GL 91-18, SECT. 6.14, "FOR CLASS 3 MODERATE ENERGY PIPING, THE LICENSEE MAY TREAT THE SYSTEM CONTAINING THE FLAW (S), EVALUATED AND FOUND TO MEET THE ACCEPTANCE CRITERIA OF GL 90-05, AS OPERABLE UNTIL RELIEF IS OBTAINED FROM THE NRC." EVALUATION METHODOLOGY EQUIVALENT TO THE "THROUGH-WALL FLAW" APPROACH IN GL 90-05 CONCLUDED THE FLAW IS ACCEPTABLE. SEE SAFETY EVALUATION AND DISPOSITION STEP 4.

FORECAST  : MODE: 0 WORK GRP: NSR REQD FOR OPERABILITY: Y VERIFIED BY : LONG, JOE DATE: 06/21/1995 TIME: 15.33.57 VERIFICATION DOCUMENT: ACCEPT AS IS DISP STEP: 2 *** DISPOSITION STEP ***

STEP 2: IMPLEMENT AUGMENTED SURVEILLANCE OF LINE S31218MLO31 TO MONITOR FOR CRACK PROPAGATION PER STEC GUIDANCE AS DEFINED BY THE CURRENT UPDATE TO THE RM PAGE. SURVEILLANCE FREQUENCY WILL BE REVISED PERIODICALLY BY STEC AS WARRANTED BY SYSTEM PERFORMANCE. QC WILL PERFORM APPROPRIATE EXAMINATIONS OF THE CRACK TO SUPPORT MONITORING OF CRACK PROPAGATION AND WILL PROVIDE INSPECTION RESULTS TO STEC FOR EVALUATION.

FORECAST -

MODE: 0 WORK GRP: QC3 VERIFIED BY REQD FOR OPERABILITY: N DATE:

TIME:

VERIFICATION DOCUMENT:

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PNCR PAGE 4 NONCONFORMANCE REPORTING SYSTEM NCR : 95060074 00 STATUS : 40-DISPOSITION APPROVED PRINTED : 06/29/95 12:42

• • • • DISPOSITION INFORMATION ****

DISP STEP: 3 *** DISPOSITION STEP ***

i STEP 3:

IMPLEMENT FCN F11316M TO REPAIR THE CRACKED SCHEDULE 10 PIPE BY REPLACING THE AFFECTED SECTION WITH SCHEDULE 40 PIPE.

FORECAST  : MODE: 9.0 WORK GRP: MA3 REQD FOR OPERABILITY: N VERIFIED BY : DATE: TIME:

VERIFICATION DOCUMENT:

DISP STEP: 4 *** DISPOSITION STEP ***

STEP 4:

PREPARE SUBMITTAL TO NRC PER GENERIC LETTER 90-05 AND NRC GUIDANCE PROVIDED BY TELEPHONE CONFERENCE ON 6/20/95, 1300 HRS.

NOTE: VOLUMETRIC EKAM (RADIOGRAPHY) PERFORMED ON 6/20/95 AND DOCUMENTED BY REPORT NO. 3N-001-95 DETERMINED THAT THE CRACK IS IS ALONG GRAIN BOUNDARIES AND COULD NOT BE DETECTED. A DEVELOPER BLOT TEST WAS PERFORMED AND FOUND THE CRACK LENGTH TO BE 9/16" LONG PER NDE REPORT NO. 3PT-048-95.

FORECAST  : MODE: 0 WORK GRP: NSL REQD FOR OPERABILITY: N VERIFIED BY : DATE: TIME:

VERIFICATION DOCUMENT:

DISP STEP: 5 *** DISPOSITION STEP ***

STEP 5: PROVIDE FAILED SECTION OF PIPE TO THE ROOT CAUSE

• GROUP FOR EVALUATION OF FAILURE MECHANISM.

FORECAST  : MODE: 0 WORK GRP: MN3 REQD FOR OPERABILITY: N VERIFIED BY : DATE: TIME:

VERIFICATION DOCUMENT:

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PNCR PAGE 5 NONCONFORMANCE REPORTING SYSTEM NCR : 95060074 00 STATUS . 40-DISPOSITION APPROVED PRINTED : 06/29/95 12:42

• • • • 10CFR 50:59 SAFETY EVALUATION ****

THIS SAFETY EVALUATION PROVIDES THE SAFETY ASSESSMENT OF BOTH THE INTERIM ACCEPT AS IS DISPOSITION FOR DEFERRING THE REPAIR TO THE CYCLE 8 REFUELING OUTAGE AND THE REPAIR STEPS NECESSARY TO REMOVE THE CRACKED SECTION OF PIPING.

THE ACCEPT-AS-IS SAFETY ASSESSMENT IS BASED ON AN ASSESSMENT OF THE ACTUAL CRACK SIZE VERSUS A FRACTURE MECHANICS ANALYSIS OF THE CRITICAL STABLE CRACK SIZE. THE ACTUAL CRACK SIZE IS 9/16 INCH.

THE FRACTURE MECHANICS RESULTS (SCE CALC. NO. M-1208-007-03A, SUPPLEMENT F) INDICATE THAT THE CONSERVATIVE LIMITING CRACK SIZE IS A 1.5" CIRCUMFERENTIAL CRACK. THE EVALUATION CONCLUDED THAT THE EXISTING CRACK WILL REMAIN STABLE AND WILL NOT PROPAGATE TO FAILURE UNDER DESIGN BASIS SEISMIC CONSIDERATIONS.

THE LEAKAGE FROM THIS MINOR CRACK IS INCONSEQUENTIAL TO THE SAFETY ANALYSIS ASSUMPTIONS. BASED ON THE CURRENT ESTIMATE OF LEAK RATE, IN THE TIME IT TAKES TO PUMP THE MAXIMUM T.S. BAMU INVENTORY OF 10000 GALLONS AT MINIMUM T.S. CHARGING FLOW OF 40 GPM, APPROXIMATELY 1 GALLON WOULD BE LOST. THIS DIVERSION IS WELL WITHIN THE ACCURACY OF CALCULATIONS AND THEREFORE IS INSIGNIFICANT. THE CONCLUSION IS THE SYSTEM REMAINS FULLY OPERABLE.

THE DISPOSITION STEPS INCLUDE AN ACTION FOR AUGMENTED SURVEILLANCE OF THE CRACK TO MONITOR THE STATUS OF THE CRACK UNTIL REPAIRS CAN BE MADE. THIS WILL ENSURE THAT THE CONDITION OF THE LINE CONTINUES TO MEET THE BASIS FOR THIS ASSESSMENT. A i SIGNIFICANT CHANGE IN CRACK LENGTH OR LEAK RATE WILL FORCE A REEVALUATION OF THIS NCR.

THE DISPOSITION REPAIR STEPS PROVIDE THE NECESSARY ACTIONS TO EVALUATE THE PIPING AND REVISE APPROPRIATE DOCUMENTATION TO INCREASE THE PIPING SCHEDULE FROM SCHEDULE 10 TO SCHEDULE 40 IN THE AFFECTED SECTION OF PIPING. THIS CHANGE WILL BE FULLY QUALIFIED FOR THE SYSTEM DESIGN CONDITIONS AND IS ALLOWED BY 90004. THIS SMALL SECTION OF PIPING CHANGED FROM SCHEDULE 10 TO SCHEDULE 40 WILL HAVE AN INSIGNIFICANT EFFECT ON THE SYSTEM  ;

HYDRAULICS.

1. MAY THE PROPOSED ACTIVITY INCREASE THE PROBABILITY OF OCCURRENCE OF AN ACCIDENT EVALUATED PREVIOUSLY IN THE SAFETY ANALYSIS REPORT?

NO. THE ONLY CHAPTER 15 EVENTS INITIATED BY THE CVCS ARE LEVEL CONTROL MALFUNCTIONS AND DILUTION EVENTS, NEITHER OF WHICH INVOLVE THE BCRIC ACID PORTION OF THE SYSTEM. THE BORIC ACID PORTION OF THE SYSTEM ONLY RESPONDS TO MITIGATE s

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PNCR PAGE 6 NONCONFORMANCE REPORTING SYSTEM NCR : 95060074 00 STATUS . 40-DISPOSITION APPROVED PRINTED : 06/29/95 12:42

• • • • 10CFR 50:59 SAFETY EVALUATION ****

THE SAFETY EVENTS, IT DOES NOT INITIATE THEM. A CRACK IN THE BORIC ACID LINES OF THE SYSTEM DOES NOT HAVE ANY EFFECT ON THE PROBABILITY OF AN CHAPTER 15 ACCIDENT EVENT, SEISMIC EVENT OR ANY OTHER OCCURRENCE IN THE PLANT.

2. MAY THE PROPOSED ACTIVITY INCREASE THE CONSEQUENCES OF AN ACCIDENT EVALUATED PREVIOUSLY IN THE SAFETY ANALYSIS REPORT?

NO. THE ONLY CONSIDERATION FOR INCREASING THE CONSEQUENCES OF IJU EVENT WOULD BE IF THE LINE WERE TO FAIL OR THE CRACK WOULD PROPAGATE IN A SEISMIC EVENT CREATING A SIGNIFICANT LEAK IN A LINE PREVIOUSLY ASSUMED TO REMAIN INTACT. THE FRACTURE MECHANICS EVALUATION OF THE EXISTING CRACK HAS PROVEN THAT THE CRACK IS WELL WITHIN THE CRITICAL CRACK LENGTH. THEREFORE IT CAN BE CONCLUDED THAT THE CRACK WILL NOT PROPAGATE TO FAILURE. AN AUGMENTED SURVEILLANCE OF THE CRACK IS INCLUDED IN THE DISPOSITION STEPS TO ".NSURE THAT THE LEAKAGE WILL REMAIN INCONSEQUENTIAL AND THAT ANY CHANGE IN THE CRACK SIZE WILL BE IDENTIFIED FOR EVALUATION.

THEREFORE, THE LINE REMAINS FULLY QUALIFIED AND OPERABLE UNTIL REPAIRS CAN BE MADE. THE REPAIRS SPECIFIED ARE ALLOWED BY 90004 AND WILL BE FULLY ANALYZED TO RETURN THE LINE TO OPERABLE STATUS AFTER REPLACING THE AFFECTED SECTION OF THE LINE.

3. MAY THE PROPOSED ACTIVITY INCREASE THE PROBABILITY OF OCCURRENCE OF A MALFUNCTION OF EQUIPMENT IMPORTANT TO SAFETY EVALUATED PREVIOUSLY IN THE SAFETY ANALYSIS REPORT?

NO. AS PREVIOUSLY DISCUSSED THE LINE REMAINS FULLY QUALIFIED AND THE LEAKAGE IS INCONSEQUENTIAL TO THE PERFORMANCE OF THE SYSTEM. AT PRESENT THE ROOT CAUSE OF THE CRACK REMAINS UNCERTAIN AND WILL NOT BE KNOWN UNTIL THE AFFECTED PIPE SECTION IS REMOVED AND EVALUATED TO DETERMINE FAILURE MECHANISM. AUGMENTED SURVEILLANCE AS PROVIDED BY THE DISPOSITION IS CONSERVATIVE AND ENSURES ANY CHANGE IN THE

' CRACK BETWEEN NOW AND REPAIR WILL BE EXPEDITIOUSLY IDENTIFIED FOR EVALUATION. THEREFORE, THE PROBABILITY OF THE LINE FAILING WILL NOT BE INCREASED, AND THERE WILL BE NO CHANGE IN THE PROBABILITY OF OCCURRENCE OF A MALFUNCTION OF THE CHARGING PUMPS OR THE BAMU PUMPS. THE REPAIRS ARE ALLOWED BY 90004 AND THE LINE WILL BE FULLY QUALIFIED FOLLOWING REPLACEMENT OF THE AFFECTED SECTION OF PIPING.

ANY MINOR LEAKAGE FROM THE EXISTING CRACK WILL BE COLLECTED AND CONDUCTED TO A LOCAL FLOOR DRAIN IN ACCORDANCE WITH NORMAL RMC PRACTICES TO CONTAIN CONTAMINATED FLUID. THE STRUCTURAL INTEGRITY OF THE SUPPCRT IMMEDIATELY ADJACENT TO THE AFFECTED PIPE WILL NOT BE DEGRADED DURING THE SHORT TIME TO THE CYCLE 8 REFUELING OUTAGE WHEN REPAIR OF THE AFFECTED PIPE WILL BE PERFCRMED. THERE ARE NO LOCAL ELECTRICAL OR l

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NONCONFORMANCE REPORTING SYSTEM NCR : 95060074 00 STATUS : 40-DISPOSITION APPROVED  ;

PRINTED : 06/29/95 12:42

• • • • 10CFR 50:59 SAFETY EVALUATION ****

MECHANICAL COMPONENTS THAT COULD BE ADVERSELY IMPACTED BY MINOR LEAKAGE OR SPRAY. A LOCAL SUMP DIRECTLY BELOW THE AFFECTED PIPE SECTION ENSURES LEAKAGE WILL BE CONTAINED TO THE LOCAL AREA IN ALL CASES.

4. MAY THE PROPOSED ACTIVITY INCREASE THE CONSEQUENCE OF A MALFUNCTION OF EQUIPMENT IMPORTANT TO SAFETY EVALUATED PREVIOUSLY IN THE SAFETY ANALYSIS REPORT?

NO. THE AFFECTED LINE IS THE TRAIN A BORATION FLOW PATH FROM THE BAMU TANKS TO THE CHARGING PUMP SUCTION. AS DISCUSSED ABOVE, THE CRACK WILL NOT CAUSE FAILURE OF THE LINE IN ANY DESIGN BASIS EVENT (INCLUDING SEISMIC EVENT), NOR RESULT IN SIGNIFICANT LEAKAGE. THE SEPARATE LINES OF THE TRAIN B I BORATION FLOW PATHS (FROM BAMU TANKS AND RWST) ARE UNAFFECTED. THE AFFECTED SECTION OF LINE WILL BE REPLACED DURING SHUTDOWN CONDITIONS WHEN THE BORIC ACID SYSTEM IS NOT REQUIRED TO BE OPERABLE. THEREFORE, ALL FAILURE MODES AND EFFECTS REMAIN BOUNDED BY EXISTING ANALYSES.

5. MAY THE PROPOSED ACTIVITY CREATE THE POSSIBILITY OF AN ACCIDENT OF A DIFFERENT TYPE THAN ANY EVALUATED PREVIOUSLY IN THE SAFF.TY ANALYSIS REPORT?

NO. THE SYSTEM REMAINS FULLY QUALIFIED TO PERFORM ITS DESIGN FUNCTION AND THE REPAIRS REPLACE THE AFFECTED SECTION OF PIPING WITH A FULLY QUALIFIED NEW SECTION OF PIPE. WITH THE LINE QUALIFIED TO EXISTING DESIGN BASIS REQUIREMENTS THERE IS NO POSSIBILITY OF AN ACCIDENT OF A DIFFERENT TYPE.  ;

6. MAY THE PROPOSED ACTIVITY CREATE THE POSSIBILITY OF A l MALFUNCTION OF EQUIPMENT IMPORTANT TO SAFETY OF A DIFFERENT l TYPE THAN EVALUATED PREVIOUSLY IN THE SAFETY ANALYSIS REPORT?

NO. THE SYSTEM REMAINS FULLY QUALIFIED TO PERFORM ITS DESIGN FUNCTION AND THE REPAIRS REPLACE THE AFFECTED SECTION OF PIPING WITH A FULLY QUALIFIED NEW SECTION OF PIPE. WITH THE

'LINE QUALIFIED TO EXISTING DESIGN BASIS REQUIREMENTS THERE '

IS NO POSSIBILITY OF A MALFUNCTION OF EQUIPMENT OF A DIFFERENT TYPE.

7. DOES THE PROPOSED ACTIVITY REDUCE THE MARGIN OF SAFETY AS  ;

DEFINED IN THE BASIS FOR ANY TECHNICAL SPECIFICATION?

• NO. THE LEAKAGE FROM THE LINE HAS PREVIOUSLY BEEN DISCUSSED '

AS INCONSEQUENTIAL, AND THE CRACK HAS BEEN CONSERVATIVELY ANALYZED TO NOT PROPAGATE IN ANY DESIGN BASIS EVENT. THERE WILL BE NO DETECTABLE HYDRAULIC EFFECTS OF THE PROPOSED REPAIR. THEREFORE, THERE IS NO EFFECT ON THE MARGINS FOR v

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PNCR PAGE 8 NONCONF0RMANCE REPORTING SYSTEM NCR: 95060074 00 STATUS : 40-DISPOSITION APPROVED PRINTED: 06/29/95 12:42

• • • • 10CFR 50:59 SAFETY EVALUATION ****

THE BAMU FLOW PATHS OR TANK INVENTORY AS IDENTIFIED IN TECHNICAL SPECIFICATIONS 3/4.1.2 (BORATION) AND 3/4.5.2 (SAFETY INJECTION).

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95060074 00 STATUS : 40-DISPOSITION APPROVED PRINTED : 06/29/95 12:42

• • • • • • • REPORTABLITIY ASSESSMENT *******

REPORT REQUIRED: N REFERENCE REPORT: NONE EVALUATED BY: MCGAWN, MALCOLM DATE: 06/22/1995 TIME: 07.33.30 APPROVED BY : DATE: TIME:

THE BORIC ACID MAKEUP AND CHARGING SYSTEMS REMAIN OPERABLE AS DESCRIBED IN THE OPERABILITY ASSESSMENT AND SAFETY EVALUATION PAGES. THE CRACK IN PIPE S31218MLO31 IS STABLE AND NOT EXPECTED TO PROPAGATE TO FAILURE.

THE PIPE MAY BE CONSIDERED OPERABLE WHILE A RELIEF REQUEST IS PENDING (DISPOSITION STEP 4) IN ACCORDANCE WITH NRC GENERIC LETTERS 91-18 AND 90-05. NRC REGION AND NRR HEADQUARTERS WERE INFORMED OF THE SITUATION BY A CONFERENCE TELEPHONE CALL AT 1300 PDT ON 6/20/95. MINU'IES OF THE TELEPHONE CALL WERE DISTRIBUTED TO SCE PARTICIPANTS VIA E-MAIL, WITH A HARD COPY ROUTED TO THE ELECTRONIC LICENSING FILING SYSTEM.

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PNCR PAGE 10 NONCONF0RMANCE REPORTING SYSTEM NCR : 95060074 00 STATUS : 40-DISPOSITION APPROVED PRINTED : 06/29/95 12:42

• • • • NCR REMARKS ****

6/20/95 AUGMENTED SURVEILLANCE INTERVAL:

PERFORM DAILY EKAMINATION OF LINE S31218MLO31 THROUGH WALL CRACK AND PROVIDE RESULTS TO STEC FOR MONITORING. D. ROBERTS 89206 APPROPRIATE EKAMINATION METHOD IS DEVELOPER BLOT TEST AS USED FOR NDE REPORT 3PT-048-95. IF CRACK LENGTH IS 3/4" OR GREATER IMMEDIATELY CONTACT STEC FOR EVALUATION.

6/21/95 MEASUREMENT OF CRACK LENGTH BY BLOT TEST PERFORMED. CRACK LENGTH RE MAINS AT 9/16". QC D. CRANDALL.

6-22-95 @l430 MEASUREMENT OF CRACK LENGTH BY DEVELOPER BLOT TEST PERFORMED.

CRACK LENGTH REMAINS AT 9/16". J.TRANER QC 45.

NOTE: MEASUREMENT TAKEN 6-21-95 WAS TAKEN AT 1630 D. CRANDALL QC 22.

6/23/95 @ 1110 MEASUREMENT OF CRACK LENGTH BY DEVELOPER BLOT TEST PERFORMED CRACK LENGTH REMAINS AT 9/16". MEASUREMENT PERFORMED BY JIM BEMIS QC#60 6-24-95 @ 1215 MEASUREMENT OF CRACK LENGTH BY DEVELOPER BLOT TEST PERFORMED CRACK LENGTH REMAINS AT 9/16". MEASUREMENT PERFORMED BY JOE TRANER QC#45.

6-25-95 @ 0855 MEASUREMENT OF CRACK LENGTH BY DEVELOPER BLOT TEST PERFORMED CRACK LENGTH REMAINS AT 9/16". MEASUREMENT PERFORMED BY JOE TRANER QC#45.

NOTE: LEAK RATE CHECKED PER REQUEST BY OPERATIONS. LEAK RATE FOR 6-24-95 AND 6-25-95 WAS APPROXIMATELY 200 DROPS / MIN. MEASURED AT THE TYGON TUBE DIS CHARGE FROM THE DRIP CATCH BAG. IF MEASURED FROM THE DROPS COMING FROM THE PIPE SUPPORT, THE RATE IS 80 DROPS / MIN. DUE TO LARGER SIZE OF DROPLETS.

JOE TRANER QC#45 6-25 . i t

6/26/95 @ 1400 REMEASURED CRACK BY DEVELOPER BLOT TEST. CRACK REMAINS AT 9/16" D. CRANDALL QC #22. ,

6-27-95 @ 1440 REMEASURED CRACK LENGTH BY DEVELOPER BLOT TEST. CRACK REMAIN S AT 9/16". JOE TRANER QC#45. t 6-28-95 @ 1015 REMEASURED CRACK LENGTH BY DEVELOPER BLOT TEST. CRACK REMAINS AT 9/16". JOE TRANER QC#45.

6-29-95 @ 0835 REMEASURED CRACK LENGTH BY DEVELOPER BLOT TEST. CRACK REMAINS AT 9/16". JOE TRANER QC#45. ,

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