ML031820462

Draft Information Inputs Faxed on June 25, 2003 (50-498 and 50-499) STP Relief Request RR-ENG-35

ML031820462
Person / Time
Site:	South Texas
Issue date:	06/25/2003
From:	Thadani M NRC/NRR/DLPM/LPD4
To:	Harrison A South Texas
Thadani M, NRR/DLPM, 415-1476
Shared Package
ML031830124	List: ML031820444 ML031820448 ML031820453 ML031820458 ML031820462 ML031830136
References
RR-ENG-35
Download: ML031820462 (2)

Text

Page I PATEMP\qW)P0001190'...... I CATEMP\GW)OOOOi.TMP Page, Mail Envelope Properties (3EFA09A3.1E5:15: 21310)

Subject:

BMI RELIEF REQUESR RR-ENG-35 Creation Date: 6125103 4:44PM From: Mohan Thadani Created By: MCT@nrc.gov Recipients Action Date & Time nrc.gov owf2_po.0WFNDO Delivered 06/25/03 04:44PM RAG CC (Robert Gramm) Opened 06126/03 06:29AM stpegs.com Transferred 06/25/03 04:44PM awharrison (MNTERNET:awharrison@stpegs.co Post Office Delivered Route owf2_po.OWFN_DO 06/25/03 04:44PM nrc.gov stpegs.com Files Size Date & Time MESSAGE 3718 06125/03 04:44PM Options Auto Delete: No Expiration Date: None Notify Recipients: Yes Priority: Standard Reply Requested: No Return Notification: None Concealed

Subject:

No Security: Standard To Be Delivered: Immediate Status Tracking: Delivered & Opened

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From: Mohan Thadani To: INTERNET:awharrison@stpegs.com Date: 6/25/03 4:44PM

Subject:

BMI RELIEF REQUESR RR-ENG-35 Wayne:

Listed below are questions that the NRC staff would like to have answered, in order to complete the review of STPNOC's request. A prompt response to these questions will expidite the NRC staff's completion of the review.

Thanks.

Mohan RAI for STP, EDM UNDERWATER, (RR-ENG-2-35)

1. ASME Section Xl has recognized that underwater welding is a specialized process that requires specialized testing and essential variables. EDM is a thermal metal removal process that leaves a heat affected zone similar to a weld heat affected zone. Since the EDM that is proposed by this relief request is being performed underwater, are the thermal metal removal process qualification tests going to be performed underwater to accurately simulate the production conditions on the test specimens?

2. IWA-4461 .4(c) and IWA-4461 .4(e) require the licensee to establish acceptance criteria for surface roughness and corrosion testing of the specimens, provide these acceptance criteria.

3. If the qualification testing of IWA-4461.4 reveal that any micro-fissures or oxide layer will be left after the EDM, what type of analysis will be performed to demonstrate that these will not propagate over the life of the RPV?

4. Will any NDE be done on the final cut surface?

5. Will any Examination be done on this item on an ongoing basis? (Every outage or every other outage, etc.)

6. How will the licensee comply with IWA-4422.2.1? (NDE after "Defect Removal Without Welding or Brazing."

7. What materials are the items to be thermally cut made of? (ASME SA Number, type, and grade; heat treatment condition). Will the EDM cut include the penetration tube; the original weld butter; the final J-groove weld; the RPV alloy steel material; the stainless steel cladding?

8. What effect will the elimination of mechanical metal removal processes have on the susceptibility of Alloy 600 materials and their associated welds to PWSCC?

9. For what period of time does the licensee request this relief?

CC: Robert Gramm