ML050880153
| ML050880153 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 05/21/2004 |
| From: | Nuclear Management Co |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2004-0282 | |
| Download: ML050880153 (2) | |
Text
Nuclear Management Company Pagel o172 El State Change History Initiate 0
by FROMM, BRAD AR Pre-Screen 5121/2004 11:44:30 Owner (None)
Subrilt to Screening Team 0
by HARPER, RON AR Screening Que 5/21/2004 18:43:11 Owner PBNP CAP Admin Screening Update 0
by KREIL. JULIE AR Screening Que 512412004 10:05:25 Owner BENNETT.
- I KEVIN El Section 1 Activity Request Id:
Activity Type:
-d One Line
Description:
w? Detailed
Description:
CAP056890 CAP Submit Dato:
.512112004 11:44:30 Potentially missed Section Xl Uniti1 RPV Weld Inspection 5/2112004 11:44:30 - FROMM, BRAD:
The PBNP Unit 1 Reactor Vessel lower head was formed-from plate material. During manufacture it was discovered that the lower head was not formed within the requisite hemispherical geometric tolerances. To provide a lower head that met the hemispherical geometric requirements,. significant material was removed (by grinding) In certain locations, and replaced (by.velding) In other locations. The repairs Involved two areas, each starting inches below the upper edge of the lowerlhead, - 180 degrees apart, each - 5 to 6 feet in length, each - 3 feet In width, and each 3/4 Inches In depth (note -the original plate thickness was 1/2 Inches). Reference the.B&W manufactuting records,<as well as the SWRI manufacturing audit report.
ASME Section Xl (1998 with Addenda through 2000), Table IWB-2500-1, Category B-A, Item No. B1.50 requires volumetric Inspection of repair welds. The table clarifies repairwelds with a note, "Material (base metal) weld repairs where repair depth exceeds 10% nominal of the vessel wall".
The PBNP - Unit I Inservice Inspection Schedule Class I Components (dated 05129/03) does not Identify any RPV lower head base metal weld repair areas for inspection.
There does not appear to be any Relief Requests associated with Justifying not performing this exam.
Initiator:
(None)
Initiator Department:
(None)
Date/Time of Discovery: 5/21/2004 11:32:10 DatelTime of Occurrence:
5121/2004 11:32:10 Identified By:
Site-Identified System:
RC PB Equipment # (1st):
(None)
Equipment Type (1st):
(None)
Equipment # (2nd):
(None)
Equipment Type (2nd):
(None)
Equipment # (3rd):
(None)
Equipment Type (3rd):
(None)
SitelUnit:
Point Beach - Unit 1 Why did this occur?:
5/21/2004 11:44:30- FROMM, BRAD:
Unknown. This is a historic issue. The value of determining the actual cause at this time is questionable. The cause Is probably associated with the evolution ASME Section XI, and the difficulty in retrieving manufacturing Information at PBNP.
Immediate Action Taken: 512112004 11:44:30 - FROMM, BRAD:
Initiated this document.
Recommendations:
5/21/2004 11:44:30 - FROMM, BRAD:
Determine If a manufacturing base metal weld repair qualifies 'as a base metal weld repair for the purpose of Table IWB-2500-1, Category B-A, Item No. 81.50.
Update the [St program documents, as necessary.
) Notify Me During Eval?:
13 Section 2 Operability Status:
Basis for Operability.
Perform the examination or obtain relief from the requirement for performing the exam.
N
& SRO Review Required?:
Y Operable i; Compensatory Actions:
N 5/21/2004 18:43:11 - HARPER, RON:
Unit 1 Is currently in MODE 6, RCS open to atmosphere.
_6)
I n
4
Nuclear Management Company Page 2 of 2 Mode 4 restraint. Need resolution prior to leaving cold shutdown MODE 5.
@ Unplanned TSAC Entry: N i External Notification:
N 8 Sectlon 3 Screened?:
Y iSignificanceLevel: c INPO OE Reqd?:
N Potential MRFF?:
.N V QA/Nuclear Oversight?; N V Licensing Review?; N Good Catch/Well Doc'd?: NA E-Section 4 Inappropriate Action:
Process:
(None)
Activity:
(None)
Human Error Type:
(None)
Human.Perr Fall Mode: (N6ne)
Equip Failure Mode:
(None)
Process Fall Mode:
(None)
OrglMgt Failure Mode: (None) b Group Causing Prob:
(None)
Hot Buttons:
(None) 8l Notes/Comments Section Xi requirements by TURNER, RUSSELL (5/21/2004 22:58'00) 1 ASME Section Xl, examination category B-A. Item no. B1.51,,requires Reactor.Vessel repair welds In the beltline region to be examined volumetrically once every ten years. The repairs noted In this CAP are located In the lower head, which is outside the betlilne region.
E Attachments and Parent/Child Links 15 Endrtcipaq tQg, EOl 40,8 1:
U1R28 MODE RESTRALNT Poten rally miss Sect X! U 1
RPV Wel lnspection by KREIL, JULIE (5/24/2004 10:07:27)
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1 Change History 5/2412004 10:05:25 by KREIL, JULIE CAP Admin Changed From *-'* To..**.*
Owner Changed From *"'
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- Last Modified Date Changed From "i To....
Last Modifier Changed From...... To.......
5124/2004 10:05:28 by KRVIL, JULIE Last Modified Date Changed. From "
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original_project Id Changed From To origInal-Issuejld Changed From ^"" To 5/24/2004 10:07:27 by KREIL, JULIE Last Modified Date Changed Feoms'§*"'* To`*."*...
Attachment Added: Principal to CE014081: '* U1R28 MODE RESTRAINT 4 "Potentially missed Sect Xi U1 RPV Weld Inspection 4
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