ML20153G498

Summary of 871015 Meeting W/Util Re Inservice Insp of Reactor Pressure Vessel Welds.W/O List of Attendees & Handouts

ML20153G498
Person / Time
Site:	Grand Gulf
Issue date:	12/28/1987
From:	Kintner L Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8805110252
Download: ML20153G498 (3)

Text

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i i DEC 26 w  !

I Occket No. 50-416 DISTRIBUTION 1 See attached sheet .

LICENSEE: System Energy Resources, Inc.

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i FACILITY: GrandGulfNuclearStation(GGNS), Unit 1

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SUBJECT:

SU WARY OF OCTOBER 15, 1987 HEETING REGATDING INSERVICE i INSPECTION (ISI)0FTHEREACTORPRESSUREVESSEL  :

The purpose of the meeting was to discuss the licensee's request for ISI  ;

relief for certain reactor pressure vessel (RPV) welds. Enclosure 1 is a list of attendees at the meeting. Enclosure 2 is a handcut prepared by the licensee to describe ISI requirements for RPV welds, equipinent and techniques 1

available for ISI and limitations to GGNS Unit 1 RPV. Enclosure 3 is a copy of Relief Requests I-00015 and I-00004.

The licensee had requested relief from certain RPV welds in Relief Request 2

hos. I-00004 and I-00015. The staff verbally infortred the licensee that there  !

was insufficient information provided to grant relief for Examination Category  ;

B-A welds in the RPV (Sheet 13 of Enclosure 2).

The licensee described the GGNS Unit i reactor pressure vessel and access for

! ISI (Sheet 2 of Enclosure 2). The BWR-6 has access to the 3'-3" annulus between a the biological shield wall and the RPV, There is access to the annulus from the top and the bottom so that inspection personnel do not pass through the  :

annulus at the core elevation, where radiation exposure is high. For the first l

refueling cutage (RF01), the licensee built a man-lift for use during ISI.  ;

However it was found to be cumbersome and would have resulted in more exposure i to personnel than would the use of ladders and scaffolds. Therefore ladders and scaffolds were used during RF01. -

The licensee described ASME Section XI Code requirertents applicable to GGNS Unit 1  :

.! (Sheets 4and5ofEnclosure2). The licensee pointed out that inspecticns of a Category B-D welds cannot be deferred te the end of the 10-year inspection inter-

) val because of Note 5 in Table IWB-2500-1 which allows such deferral if examinations d

are conducted from the inside surface. However, BWRs are exanined from the l l outside surface because of the cladding on the inside surface.

4 The licensee described equiprnent and techniques used in the examination! (Sheets 6-8 and 10 of Enclosure 2). Typical interferences with equipment associated with i

a RPV ISI for BWRs were discussed (Sheet 9 of Enclosure P). Such interferences are due to radiused areas which cause separation of the transducer from the i vessel surface (Sheet 38), obstructions such as the vessel skirt (Sheet 39),

vessel name) late (Sheet 40), nozzles in bottom head (Sheet 41) and insulation l

brackets (Sleet 43).

The licensee identified the Category B-A welds in Relief Request I-00015 (Enclosure

3. Sheets 1-34) and provided the following coments regarding these welds (Weld j locations are shown on Sheet 11B of Enclosure 2).

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i 8805110252 071228 DR ADOCK 050 16 i

.* Seams DA, DB, DC and DD These welds in the botto,11 head are more than 50% inaccessible because of components installed in the bottom head (control rod drives and in core instruments).

seam AD This weld is 1.4% inaccessible because of the nameplate welded to the vessel.

Seam AE This weld is near the vessel flange which prevents examina-tion frcm the flange side.

Seams BB and BC Cutouts were made in these vertical welds for two nozzles, which prevent examination of the weli for about 15 inches above and below the nozzle centerline.

Seam BA A nozzle prevents complete examination. The licensee noted that Figure 11 in its submittal was incorrect and would be replaced.

Seams BH, BJ and BK Nozzles prevent complete examination. The staff noted that percentage of weld that is inaccessible was not reported in the submittal and requested that it be provided.

Seam AG Relief had been requested for this top head weld because of its proximity to the flange. However, further consideration indicates that this weld can be examined from the inside surface, '

because the head is not clad. Therefore, the request for relief from ISI requirements of this weld will be withdrawn.

Seams BM, BN, BP AND BR These longitudinal welds intersect with the circumferential weld that joins the shell ring to the flange.

Therefore, the portions of the welds near the flange cannot be fully examined frem the flange side.

Seams DH, DJ, DK, DM, DN and DP Relief for these welds in the top head was requested l'ecause they intersect the head-to-flange weld.

However, as in the Seam AG weld, they can be examined from the inside surface of the head. Therefore, the request for relief from ISI requirements of these welds will be withdrawr..

Relief Request No. I-00004 is reprcduced on Sheets 35-41 of Enclosure 3. This  ;

RPV shell-to-bottom-head weld cannot be examined by automated equipnent now avail- l able because of the curvature of the bottom head. Radiation in this area is high and exposure of personnel for manual examination of all the weld would be very high. As an alternative, the licensee is proposing to examine that area which had three recordable indications in the preservice examination. The staff has no l need for further inforriation on Relief Request No. I-00004.

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The staff requested that Felief Request I-00015 be revised to make the changes indicated above, i.e., delete requests for relief for top head welds and provide  !

a corrected Figure 11. The staff's review will include the revised request.  !

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Lester L. Kintner, Sr. Project Manager Project Directorate 11-1 Division of Reactor Projects I/II cc: next page PM P :DRPR

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D E04I:DRPR LKintner EAdensam '

12/12/87 12p')/87

MEETING StHMARY DISTRIBUTION DocketNo(s): 50-416 NRC PDR Local PDR PD 11-1 r/f E. Adensam Attorney, OGC P. Anderson E. Jordan J. Partlow ACRS(10)

Project Manager Lester L. Kinter NRC PARTICIPANTS W. Koo I. Bukulmez M. Pum F. Litton W. Hazelton

( bec: Applicant & Service List