ML20245B068

Forwards Plans & Commitments for Insp &/Or Mod of Recirculation Piping Susceptible to Igscc.Util Will Also Perform Chemical Decontamination of Reactor Coolant Recirculation Sys Piping

ML20245B068
Person / Time
Site:	Brunswick
Issue date:	06/15/1989
From:	Watson R CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NLS-89-155, TAC-67592, NUDOCS 8906220376
Download: ML20245B068 (8)

Text

I Carolina Power & Light Company P. O. Box 1551

• Raleegh. N. C. 27602 SERIAL: NLS-89-155 JUN 151989 i

R. A. WATSON Senior Vice President Nv: lear Generation United States Nuclear Regulatory Commission ATTENTION: Document Control Desk Washington, DC 20555 i

BRUNSWICK STEAM ELECTRIC PLANT, UNIT NO. 2 l

DOCKET No. 50-324/ LICENSE NO. DPR-62 IGSCC INSPECTION PLANS (TAC No. 67592)

Gentlemen:

l By letter dated April 25, 1989, the NRC required Carolina Power & Light Company (CP&L) to submit plans for the inspection and/or modification to the recirculation piping, and any other piping susceptible to Intergranular Stress l Corrosion Crecking (IGSCC) at BSEP-2, at least three (3) months prior to the start of the r. ext refueling outage. A meeting held with NRC on June 13, 1989 f l

provided greater insight to these plans. This submittal describes the plans '

and commitments for the inspection and/or modification of the recirculation l

piping and any other piping system susceptible to IGSCC. These inspections '

and mitigation actions will be performed during the upcoming Refueling  !

Outage 8 at BSEP-2, currently scheduled to begin on September 9, 1989 The j inspections will be performed in accordance with NUREG 0313, Revision 2.

The scope of actions to be taken is divided into five (5) categories:

1) NUREG 0313, Revision 2, Inspections; 2) RWCU Piping Replacement;

3) Hydrogen Water Chemistry Implementation; 4) Criteria for Replacement / Repair, and 5) Schedule for Inspection / Decision Process. Each category is discussed in Enclosure 1 to this letter.

In addition to this scope of actions, CP&L will be performing a chemical decontamination of the Reactor Coolant Recirculation System (RCRS) piping.

The results of the inspections, the specific scope of the overlay applications and/or the RCRS pipe replacement and a description of any further corrective actions will be submitted prior to BSEP-2 start-up.

l

{

I

1. f1 pg6220376890615 "

(j ADOCM 05000324 I

~ \

PNu

Docum:nt control Desk .

, NLS-89-155 / Page 2 Please refer any questions concerning this submittal to Mr. W. R. Murray at (919) 546-4661.

Yours very truly, f 8~?U .

R. A. Watson "AW/DBB/crs (340CRS) i

'J Enclosures ]

)

I cc: Mr. S. D. Ebneter Mr. W. H. Ruland Mr. E. G. Tourigny i

l

)

. . l, ENCLOSURE 1 REFUELING OUTAGE 8 SCOPE OF ACTIONS

1) NUREG 0313, Revision-2, Inspections The BSEP-2, Refueling Outage 8 inspection program will include ultrasonic inspection of the austenitic stainless steel welds in accordance with the recommendations of NUREG 0313, Revision 2, and the requirements specified in the April 25, 1989 Safety Evaluation Report regarding the BSEP-2, Refueling Outage 7, inspections program and results.

j CP&L has as categories classified defined the " service in the NUREG. sensitive" weldments into the seven (7)

Table 1 provides a listing of the .

welds by category. The BSEP-2, Refueling Outage 8 inspection plan, based on these classifications, is as follows:

Category A Welds Table 2 provides a listing of the four (4) welds in this category that will be inspected during the Refueling Outage 8. j 1

Category B Welds BSEP-2 has no welds in this category.

l Category C Welds I i

Table 2 provides a listing of the 39 welds in this category that will be inspected during the Refueling Outage 8. Four of the welds in this category (i.e., 12 ARA 4, 12ARB4, 12BRH3, and 12BRK1) were added in  !

response to the Staff's recommendation (reference SER dated April 25, 1989) that the IHSI treated welds be ' inspected with increased sampling i of thosethe during nextwelds.

piping few refueling outages to ensure the structural integrity Category y Welds Table 2 provides a listing of the 21 welds in this category that will be inspected during the Refueling Outage 8. ,

Category E Welds I There are currently 41 standard design weld overlay repairs on BSEP-2.

1 Two (12ARD2 and 12ARE5) were applied, and three (28B4, 28B3, and 28B4) were upgraded to standard design during the Refueling Outage 7. Table 2 provides a listing on the 21 weld overlays in this category that will be inspected during the Refueling Outage 8.

l (340CRS)

Category F Welds l Table 2 provides a-listing of'the two (2) welds in this category that will be inspected during the Refueling Outage 8.

Category G Welds Table 2 provides a listing of the two (2) welds in this category that will be inspected during.the Refueling Outage 8.

2) RWCU Pipe Replacement The remaining susceptible portions of the 4" RWCU piping system will be l replaced using conforming 316 stainless steel materials. All new 4" j welds will receive.a preservice, ultrasonic examination.

3) Hydrogen Water Chemistry Implementation Hydrogen WaterLChemistry installation is complete and in operation.

Final acceptance testing is currently in progress.

4) Criteria for Replacement / Repair-i Unit 2 o

Inspections will be performed on five (5) recirculation system nozzle to safe end Inconel butter welds, one of which.will be the Inconal weld overlay on nozzle N2E. If no substantial crack growth is ob: erved. in the N2E indication, and if no unacceptable indications are identified in the other nozzles, the remaining IGSCC l inspection scope will be completed and the unit will be' returned to service. Growth which could be construed as an error in the accurancy of the UT equipment being used will not be considered as I actual growth. Unacceptable indications are defined as those.

indications which could not be accepted by fracture mechanics analysis, and would require weld overlay reinforcement. However, should new indications which are acceptable by analysis be  ;

identified in any of the original nozzles, the remaining.5 nozzles j will also be inspected (sample expansion).- If any unacceptable j indications are observed on any of the nozzles, the recirculation system replacement (risers, safe ends and nozzle butter) will be ,

i performed in the Fall 1989 refueling outage. -Otherwise, the {

recirculation system replacement (risers, safe ends and nozzle butter) will be performed during the following (Refueling 9) outage.  ;

o The thermal sleeve' attachment welds of all ten (10) recirculation syst -. inlet safe ends will be inspected.. If any indications are identified that cannot be accepted by. fracture mechanics' analysis or

(.

by the application of leak barrier weld overlay, the recirculation i system replacement will.be performed.during the Fall 1989 refueling i outage. Otherwise, recirculation s/ stem replacement (riser, safe ends and nozzle butter) will be performed during the following (Refueling 9) outage. ,

l

)

(340CRS)

_ _ _ _ _ _ __A

5) Schedule for Inspection / Decision Process I I

o September 9, 1989 -

Start date for Unit 2, Refuel 8 Outage o September 14, 1989. -

Start inspections.on five (5) recirculation system inlet nozzles ('A',

'B', 'E', 'H', and 'K')

o September 23, 1989 -

complete evaluation of nozzle inspection j results '

o September 27, 1989 , I

- Decision made to perform weld overlays or recirculation system inlet piping / safe end replacement l

l 1

I l

(340CRS)

s Pege 1 of 2  !

TABLE 1 REACTOR RECIRCULATION (B32) IGSCC INSPECTION CLASSIFICATIONS l Category A Category C Category D Category E l

22AM3BCA 28A2 28B2 28A9BC1 28A4 28B3 I

22AM3BCB 28A3 28B6 2EB9BC 28A8 28B4 l 22AM5BCA 28A5 28B7 12 ARA 4A 28A13 28B5 22AM5BCB 28A6 28B8 12ARB4A- 22AM5 28B11 22BM1BCA 28A7 28B9 12 ARC 4A 12 ARA 2 22BM1 )

22BM1BCB 28A9 28B10 12ARD4A 12 ARA 3 12BRF2 l 22BM3BCA 28A10 28B12 12ARE4A 12ARB2 12BRF3 I 22BM3BCB 28A11 28B13 12BRF4A 12ARB3 12BRF4 j 4A2 4B2 28A12 28B14 12BRG4A -12 ARC 1 12BRG1 i l

4A3 4B3 28A14 28B15 12BRH4A 12 ARC 2 12BRG2 )

4A4 4B4 28A15 28B16 12BRJ4A 12 ARC 3 12BRG3

! 4A5 4B5 28A16 28B17 12BRK4A- 12 ARC 4 12BRG4 4A6 4B6 .28A17 28B18 A THRMLSLV 12ARD1 12BRH2 4A7 4B7 28A18 24B12 B THRMLSLV 12ARD2 12BRH4 4A8 4B8 24A12 22BM2 C THRMLSLV 12ARD4 12BRJ2 '

4A9 4B9 22AM1 22BM3 D THRMLSLV 12ARE2 12BRJ3 4A10 4B10 22AM2 22BM4 E THRMLSLV 12ARE3 12BRK2 <

22AM3 20A1 F THRMLSLV 12ARE4 12BRK3 1 22AM4 20A1BC G THRMLSLV 12 ARES 22AM6 20A2 H THRMLSLV 4A1 4B1 12 ARA 1 12BRF1 J THRMLSLV 4A11 4B11 i 12 ARA 4 12BRF5 K THRMLSLV j 12 ARA 5 12BRG5 1 12ARB1 12BRH1 41 12ARB4 12BRH3 12ARB5 12BRHS Category F 12 ARCS 12BRJ1 28A1 1 12ARD3 12BRJ4 28B1 12ARDS 12BRJ5 12ARE1 12BRK1 j 12BRK4 12BRK5 28A12BC 28A15BC1 28B12BC1  ;

28B15BC1  !

26 66 22 2 l (340CRS)

G

'ij

, l. -

Page 2 of ! 2 RWCU PIPING (G31) IGSCC INSPECTION CLASSIFICATIONS 1 Category A Category A# Category D Category G 2RWCU-R9' 2RWCU-467B 2G31-2051 2RWCU-R10A 2RWCU-1951 2RWCU-R8 2G31-2055- 2G31-2053 2RWCU-1954 2RWCU-194 2RWCU-1992 2G31-2056 2G31 -2054 2RWCU-1960 2RWCU-193 2RWCU-1991 2G31-2058 2031-2042 2RWCU-1948A 2RWCU-192 2RWCU-1990A 2G31-2059 2G31-2043 2RWCU-191 l 2RWCU-1989 2G31-2060 2G31-2044 2RWCU-1011 2RWCU-1988 2G31-2062 2G31-2045 2RWCU-1014 2RWCU-1987 2G31-2079 2G31-2046 2RWCU-190 ,

2RWCV-2007 2G31-2081 2G31-2047 2RWCU-189 2RWCU-2006 '2G31-2082 2G31-2048 2RWCU-188 2RWCU-RSA 2G31-2083 2G31-2035 2RWCU-187 2RWCU-R4A 2G31-2084 2G31-2037- 2RWCU-136 2RWCU-2003 2G31-2085 2G31-2038 2RWCU-185 2RWCU-2002 2G31-2074 2G31-2039 2RWCU-30 2RWCU-R1B 2G31-2075 2G31-2040 2RWCU-29 i 2G31-2076 2RWCV-1608 2RWCU-28 J 2G31-2077 2RWCU-1609 2RWCU-27 2G31-2078 2RWCU-1611 2RWCU-26 2G31-2086 2RWCU-1613 2RWCU-25 2G31-2087 2RWCU-1617 2RWCU-24 2G31-2063 2RWCU-1572 2RWCU-23 2G31-2065 2RWCU-1571 2RWCU-22 4 2G31-2066 2RWCU-1570 2RWCU-18 l 2G31-2068 2RWCU-1569 2G31-2069 2RWCU-1953 2G31-2070 2RWCU-1952 1 2G31-2071 2G31-2072' {

2G31-2073 2G31-2052 )

2RWCU-1610A 2RWCU-2618A  !

2RWCU-1534A 15 59 4- 23 CORE SPRAY (E21) JET PUMP INSTRUMENTATION .(B21)

Category C Category C Category G 10NSA 4NBA .JPI-22-1 10N5B 4N8B JPI-22-2 i

i l

(340CRS)'

TABLE 2 REFUELING OUTAGE 8 - IGSCC INSPECTIONS Category A Welds 22AM3BCB 2RWCU-467B 2G31-2060 2G31-1613 Category C Welds 28A7 28A15 20A1 12ARB5 28B13 22BM2 12BRK5 28A9 28A16 20A1BC 28B7 28B14 22BM3 10NSB 28A10 28A17 20A2 28B8 28B15 22BM4 4N8B 28A11 28A18 12 ARA 4 28B9 -28B17 12BRH3 28A12 24A12 12ARAS 28B10 28B18 12BRH5 28A14 22AM4 12ARB4 28B12 24B13 12BRK1 Category D Welds-12 ARA 4A 12BRH4A A THRMLSLV F THRMSLV 12ARB4A 12BRJ4A B THRMLSLV G THRMSLV.

12 ARC 4A 2RWCU-R10A C THRMLSLV H THRMSLV 12ARD4A 2RWCU-1954 D THRMLSLV J THRMSLV 12BRG4A 2RWCU-1960 E THRMLSLV K THRMSLV 2RWCU-1949A Category E Welds i 1

28A8 12ARB3 12 ARES 12B4F4 28A13 12ARD2 4A1 12BRG1 22AM5 12ARD4 28B11 12BRH2 >

12 ARA 3 12ARE2 12BRF2 12BhH4 12ARB2 12ARE3 12BRF3 4B1 Category F Welds 28A1 28B1 Category G Welds JPI-22-1 JPI-22-2 l

I (340CRS)-

_ - _ - _ _ _ - _ _ - _ _ _ - - - _ - -