ML20246Q318

Concludes That Facility Can Be Safely Returned to Operation for at Least One Addl Fuel Cycle,Based on Util 880718,1228, 890113,27,0220 & 0314 Submittals Re IGSCC Insp & Repair Performed During Refueling Outage 6

ML20246Q318
Person / Time
Site:	Brunswick
Issue date:	03/22/1989
From:	Tourigny E Office of Nuclear Reactor Regulation
To:	Utley E CAROLINA POWER & LIGHT CO.
References
GL-88-01, GL-88-1, TAC-71409, NUDOCS 8903290014
Download: ML20246Q318 (3)

Text

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March 22, 1989-  !

NRC PDR l Local PDR

. , PD2-1 r/f: i Docket No. 50-325: S.;Varga .

G. Lainas  :-

Mr. E. E. Utley ~ . E. Adensam

' Senior Executive Vice President' -E. Reeves i Power Supply and Engineering & Construction P. Anderson.

Carolina: Power & Light Company E.'Tourigny' Post Office Box 1551 OGC ' 1 Raleigh, North Carolina '27602; L;.Spessard E. Jordan

Dear Mr. Utley:

~

B. Grimes.

ACRS (10)

~

SUBJECT:

INTERGRANULAR~ STRESS COR0SION-CRACKING-(IGSCC) JINSPECTION AND' j REPAIR, BRUNSWICK UNIT 1 (TACJNO. 71409)

The staff has reviewed the 'submittals ~ dated July 18 and December 28, 1988, January 13. 27, February 20 and March 14. 1989 from Carolina ~ Power & Light Company (CP&L).regardingtheIGSCCinspectionandrepairperformedduringihe current l refueling outage-6 at Brunswick Unit 1.. Our review also considered the infonnation provided by your staff in theimeetings: held on December 9,.. .

)

1988 and February 22,-1989. CP&L reported;that a total of 92 welds susceptible j l

to IGSCC in various stainless steel piping (systems were' inspected during.this- j refueling outage and that 19 welds were'found'to contain~IGSCC indications.  !

These 19 welds consists'of 7' recirculation riser nozzle-to-safe-end welds, 10 ,

riser safe-end thermal- sleeve attachment. welds and;2 core, spray nozzle to - J safe-end welds. All 19 flawed welds were reinforced with' weld overlay for

. limited ~ service. . CP&L also' reported that there was no significant flaw growth' j

.in weld.28A8, which was found flawed during previousL refueling outage and'  ;

was left in-as stress improved condition.. 1 Based on~our review of the information provided by CP&L we find, that the inspection and overlay repair performed during thisLoutage meets the guidelines.

.in Generic Letter 88-01. Therefore, we conclude that Brunswick: Unit 1 can be' ,

safely returned to ope'.wtion for at least one additional fuel: cycle with l assurance that the integrity'of the reactor coolant pressure b; ndary will be maintained.

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The. Safety Evaluation which provides the basis for the above lusions will be transmitted under separate cover. -

4 It should be noted that the safe-end configuration is very complex, and it is diffcult to perform stress analysis on such componenetsi Because of uncertainties >

in CP&L's stress analysis, the~ weld overlay repair performed 'on the safe-ends'  ;

is acceptable only for one fuel cycle at this time. In. view of:the extensive i cracking of recirculation riser piping and safe-ends at Brunswick Unit 1:and l the recent' inspection results from another BWR'which question the effectiveness  ;

l- of hydrogen water. chemistry in mitigating crack growth, the' staff strongly recommends'CP&L consider replacing the' recirculation riser piping.and ~ safe-ends during the next refueling outage.

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2 8903290014 890322'

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d i Mr. E. E. Utley  !

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Lastly, we have concern about.the long term behavior of the piping and the-reactor vessel nozzles, therefore, we request that the plan for IGSCC inspection and piping / safe-ends mitigation and replacement during the next refueling outage be submitted for our review and comment at least three months prior to the start of the next refueling outage.

Please note that'we have not completed the review of CP&L's response to GL 88-01. When the review is completed, a separate Safety Evaluation.will be 1 forwarded to CP&L.

1 The reporting and/or recordkeeping requirements contained in this letter affect fewer than 10 respondents; therefore, OMB clearance is not required under P. L.96-511. j Sincerely, l

I E. G. Tourigny, Senior Project Manager. 3 Project Directorate II-1 -

Division of Reactor Projects I/II l Office of Nuclear Reactor Regulation 4 cc:

See next page j s

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9 0FFICIAL RECORD COPY

Mr. E. E. Utley .

Brunswick Steam Electric Plant Carolina Power & Light Company Units-1 and 2 cc:

Mr. Russell B. Starkey, Jr. Mr. J. L. Harness Project Manager Plant General Manager Brunswick Nuclear Project ' Brunswick Steae Electric Plant Box 10429 P. O. Box 10429 Southport, North Carolina 28461 Southport, North Carolina 28461 Mr. R. E. Jones, General Counsel Mr. H. A. Cole.

Carolina. Power & Light Company Special Deputy Attorney General P. O. Box 1551 State of North Carolina Raleigh, North Carolina 27602 Post Office Box 629 Raleigh, North Carolina 27602 Mr. Mark S. Calvert t Associate General Counsel Mr. Robert P. Gruber Carolina Power & Light Company Executive Director Post Office Box 1551 Public Staff - NCUC Raleigh, North Carolina 27602 . Post Office Box 29520 Raleigh, North Carolina 27626-0520 Ms. Grace Beasley .

Board of Commissioners Post Office Box 249 Bolivia, North Carolina 28422 Mrs. Chrys Baggett State Clearinghouse Budget and Management 116 West Jones Street Raleigh, North Carolina 27603 Resident Inspector U. S. Nuclear Regulatory Commission Star Route-1 Post Office Box 208 Southport, North Carolina 28461 Regional Administrator, Region II U. S. Nuclear Regulatory Commission 101 Marietta Street, Suite 2900 Atlanta, Georgia 30323 Mr. Dayne H. Brown, Chief Radiation Protection Branch Division of Facility Services N. C. Department of Human Resources 701 Barbour Drive Raleigh, North Carolina 27603-2008 1

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