ML19325C926

Advises That Util 890615 & 0821 Ltrs Re Isccc Insp Plan Meets Generic Ltr 88-01 Guidelines & Acceptable

ML19325C926
Person / Time
Site:	Brunswick
Issue date:	10/10/1989
From:	Tourigny E Office of Nuclear Reactor Regulation
To:	Eury L CAROLINA POWER & LIGHT CO.
References
GL-88-01, GL-88-1, TAC-73434, NUDOCS 8910180127
Download: ML19325C926 (8)

Text

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Dear Mr.:

Eury:-

SUBJECT:

L REVIEW 0F'IGSCC INSPECTION PLAN AND REQUEST FOR' WELDS, BRUNSWICK C > STEAM ELECTRIC PLANT. UNITS 1 AND 2 (TAC NO. 73434) T j c The. st'aff haEcompleted its review of your June 15 and August submittal s. reg arcing : the ;interg ra nular stres s corrosi on cra c king 21,(1989150Cj ' f inspection plan that will' be followed during the Unit 21989 refueling- ~i ' outage ; Carolina Power-&' Light Conipany (CP&L) plans toEinspect at total , of 85 pip (RWCU),' core spray, and jet pump. instrunantation, and replaceing welds L J

cleanup-lW i

E recirculation system risers,- safe ends and-nozzle butter, and portions of "1

the RWCU system using conforming 316 stainless steel materials.

Twenty eight

of the-forty 1one overlay-repaired welds will be eliminated as a result of

' the Unit 2; piping: replacement.' Based:upon our review, we Leonclude that the Unit 2 inspection plan meets the guidelines of; Generic Letter 88-01, entitled ' s

• NRC Position!onlIGSCC.in BWR Austenitic Stainless: Steel Piping," and is y

y

acceptable.

1 M lIn:a relt.ted' but separate matter, the staff has initiated a program to evaluate the. effectiveness of weld overlay repair' in mitigating IGSCC..One aspect of the program is to compare the ultrasonic testing result of overlayed. cracked o ' piping welds that:have beeniin service' for several fuel cycles with the results N,, .of metallurgical examinations. :We have:identifed Unit'2 riser welds 12BRK2, .12BRJ2,12BRK3,12BRJ3, and 1PBRG4 and safe-end'to nczzle weld 12 ARES as t H candidate welds for metallurigical examination. We' have also identified Unit.1 b .. safe-end to.' nozzle weld 12 ARES as candidate weld for a similar examination. R

The staff has contracted with'Brookhaven National Laboratory '(BNL) to conduct such examinations ~and' BNL<is licensed to handle' radioactive and contaminated

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.e m y t .o q y f*- AThe staff requests that; CP&L: consider-providing the above specified welds t r e' .b..- ) 3 ~ l 6*4 1'or inclusioniin BNL programs'. Additional information regarding the program. 1 can be obtained from the BNL: contact person,: Mr. Carl Czaj kowsLi,'at. ~ " v' ',, 516-282-4420. tCP&L's participation in the NRC/BNL program would be strictly-vo'1untaryL M s d'3 6 ,,N 1 't p' ~ g gy!. Sincerelyi l 1 ,. w. 'l . g.. J 1 Original-Signed _By:. t s q ,j "( -p, I. 3 -{ y,o E. G.;Tourigny, Senior Project Manager W. r 9 Project Directorate II - T Division of Reactor Projects - I/II' '*4*' Office of Nuclear' Peactor Regulation J ^7&

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See next page.

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Ydeen kI k*i..+ ~ ' " " ~ October 10, 1989-1 y - Locke't Fcs. 50-325-i 7, Land 50 324

Mr. Lynn. W. Eury -

Executive Vice President

Power Supply-L Carolina Power.& Light Company T

', ' Post Office: Box 1551 Raleigh,. North Carolina 27602. o . Dea r Mr. - Eury:1 ? L SUBJECTi= REVIEW 0FTIGSCC INSPECTION PLAN AND REQUEST FOR WELDS, BRUNSWICK' L ' ' STEAM ELECTRIC: PLANT, UNITS 1 AND 2 (TAC NO. 73434)

-The staff _ hes completed its review of your June 15 and August

+ .submittals; regarding the intergranular stress corrosion cracking 21,(198915000) inspection plan.that will-be followed during' the Unit 21989 refueling - outaget, Carolina-Power.& Light Company (CP&L) plans-to inspect a total 'of 85: pip (RkCU),- core spray. and jet pump instrumentation, and replace cleanup:

recirculation. system risers, safe ends' and nozzle butter, and portions of a

the RWCU system using conforming 316-stainless-steel-materials. Twenty eight i of the forty one overlay repaired welds will be eliminated as'a result of 3 the: Unit ? piping replacement. Based upon our review, we conclude that the Unit l2 inspectica plan-meets the guidelines of Generic Letter 88-01, entitled -"NRC Position ~on IGSCC-in BWR Austenitic Stainless 5t' eel Piping," and is acceptable. (

In a;relat'ed but separate matter, Ethe staff has initiated a program to evaluate the effectiveness of weld overlay repair in mitigating IGSCC. One aspect of-3

'.the= program is to compare the ultrasonic testinc result of overlayud cracked . piping-welds.that have been in' service for severcl fuel = c)cles with-the results of raetallurgical examinations. We have identifed Unit 2 riser welds 12BRK2,. 12BRJ2,.12BRK3,12BRJ3, and 12BRG4 and safe-end to nczzle weld 12ARE5 as ' candidate welds for metallorigical examination. We have also identified Unit 1- ~ safe-end to nozzle weld 12 ARES as candidate weld for a similar examination. Thetstaff.has= contracted with Brookhaven National Laboratory (BNL) to conduct - such examinations and BNL is licensed to handle radioactive and contaminated 'naterials.. L I v 4 I l N . - m-.- ---...-%U <i.~--.-..e.

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• * *n The staff reqkests that CP&L consider providing the above specified welds-a for inclusion in Bit. programs. Additional information regarding the program :

can be obtained from the BNL contact person, Mr. Carl Czajkowsk.- at '516-282-4420.: CP&L's. participation in the NRC/BNL program would be strictly . voluntary. 'd Sincerely, Original Signed By: E. G. Tourigny, Senior Project Manager Project Directorate 11-1 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation cc: See next page: DISTRIBUTION See next page-ko +, f t' i. .Q. ,< (n i I t- . ( l 0 - PIT f. P0h1 P h f PAncWson ET ur gny:sw E sam 10/f/89 10p 89 10/jg89 /0 l 1, - a 5

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