ML19329E228

Interim Deficiency Rept Re Undersized Pipe Support Fillet Welds.Vendor Pipe Support Adequacy Testing Continues & Qc/Qa Procedures Were Revised to Specifically Prohibit Undersize Tolerance

ML19329E228
Person / Time
Site:	Midland
Issue date:	02/10/1978
From:	Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
References
HOWE-11-78, NUDOCS 8006110648
Download: ML19329E228 (7)

Text

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- REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

DISTRIBUTION FOR INCOMING MATERIAL 50kfff)):30 REC: NRC ORG: HOWELL S DOCDATE: 02/10/78 NRC CONSUMERS PWR DATE RCVD: 02/23/78 DOCTYPE: LETTER NOTARIZED: NO COPIES RECEIVED

SUBJECT:

LTR 1 ENCL 1 INTERIM REPT. CONCERNING PIPE SUPPORT FILLET WELDS AT THE SUBJECT FACILITY.

PLANT NAME: MIDLAND - UNIT 1 REVIEWER INITIAL: XRL MIDLAND - UNIT 2 DISTRIBUTER INITIAL:

rs**************** DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS ******************

CONSTRUCTION DEFICIENCY REPORT (10CFR50.55(E).

(DISTRIBUTION CODE BOO 4)

FOR ACTION: ASST DIR VASSALLO**LTR ONLY BR CHIEF VARGA**LTR ONLY PROJ MGR HOOD **LTR ONLY LIC ASST SERVICE **LTR ONLY INTERNAL: ( REG Ff )*W/ ENCL NRC PDR**W/ ENCL ia c**W/2 ENCL OELD**LTR ONLY GOSSICK & STAFF **LTR ONLY MIPC**W/ ENCL BOYD**LTR ONLY DEYOUNG**W/ ENCL HELTEMES**W/ ENCL R. MATTEON**LTR ONLY KNIGHT **LTR ONLY ROSS**LTR ONLY TEDESCO**LTR ONLY EISENHUT**LTR ONLY STANDARDS DEV.**W/ ENCL K SEYFRIT/IE**W/ ENCL EXTERNAL: LPDR'S MIDLAND, MI**W/ ENCL TIC **W/ ENCL NSIC**W/ ENCL ACRS CAT A**W/16 LTRS THIS DOCUMENT CONTAINS POOR QUAUTY PAGES DISTRIBUTION: LTR 40 ENCL 28 CONTROL NER: /896900?9s SIZE: 2P+1P+SP oco******************************** THE END ***

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h...ua I xx - Generas Offices: 212 West Michigan Avenue Jackson Micnigen 49201. Area Code 517 788-0550 February 10, 1978 Hove-ll-78 N -- \

                                                                                                   . ,i . l   l' lJ (.

Mr J. G. Keppler y' - Office of Inspection & Enforcement d'>, . Region III ~~

                                                                                                  .Q US Huclear Re6ulatory Cc=sissicn 799 Roosevelt Road                                                                    Qy K'             .

Glen Ellyn, IL 60137 / MIDLA'ID NUCLEAR PLANT - ' UNIT HO.1, LOCKET NO. 50-329 UNIT NO. 2, DOCK 22 H0 50-330 PIPE SUPPORT FILLET WELDS Reference 1) Letter, S. H. Howell to J. G. Keppler, Midland nuclear Plant - Unit No.1, Docket No. 50-329; Unit No. 2, Docket No. 50-330; Pipe Support Fillet Welds, Serial Hove-197-77, dated november 21, 1977

2) Letter, S. H. Howell to J. G. Keppler, Midland Nuclear Plant -

Unit No.1, Docket No. 50-329; Unit no. 2, Docket No. 50-330; Pipe Support Fillet Welds, Serial Hove-214-77, dated December 22, 1977 The referenced letters were interim reports. This letter is also an interim report, since analysis and testing is continuing to provide a determination of the adequacy of the pipe supports with the undersized velds. Attachment 1 and 2 provide Bechtel Associates' interim reports in response to the Management Corrective Action Reports (MCAR-1 Report No.18 and MCAR-1 Report No.19). The following additional information was developed subsequent to the preparation of the attached interim reports.

1. Helmut Thielsch, Vice President of Research and Developtert, IT2 Grinnell met with Consumers and Bechtel on January 25, 1978. At this meeting, he presented ITT Grinnell's plan for cc=pleting their effort to demonstrate the adequacy of the pipe supports. It uas agreed to expand the testing program, which included additional configurations, to assure bracketing verse possible existing conditions. Testing is expected to be ec=pleted and a draft report provided for Bechtel and Consumers Power Company review.

by February 28, 1978.

2. ITI Grinnell agreed to revice their QA/QC Procedure 02A000 to specify that ,

no undersize tolerance vill be allowed on fillet velds. p M FEB 131978 5

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3. Several additional field velds vere found to be up to 1/16 inch undersize.

h. Recent receipt inspections of pipe restraints supplied by ITT Grinnell have shown the hangers to have no nonconfor=ances for undersized velds.

                               'See Attachment 3 Another interim or final report will be sent on or before March 31, 1978.

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Attachments: 1) Interim Report No. 3 dated January 20, 1978, MCAR-18

2) Interim Report No. 3 dated January 20, 1978, MCAR-19

3) Bechtel, Trend Rate Chart No. IA and 1B, ITT Grinnell M-106-AC (Hangers) '

CC: Dr Ernst Volgenau, USNRC (15) Director, Office of Management Infor=ation and Program Control, USURC (1) A.

                                      .                              n   Attachment 1 Howa-ll-78
      .                                                                  Page 1 of 1

SUBJECT:

MCAR # 18 (Issued 10-28-77 ) INTERIM REPORT #3 DATE: / -2. O -7 3 , PROJECT: Consumers Power Company Midland Plant Units 1 & 2 Bechtel Job 7220 Status of Corrective and Investigation To date, Bechtel has not received from Grinnell the requested program and approach for presenting their justification to the /.SME code com-mittee and other jurisdictional authorities, as required by MCAR-18 Item 1. Forecast Date on Corrective Action The interim reports will be issued on a 30 day basis until the final Grinnell report justifying their position for the deviation from the code is issued. Completion of Grinnell program is expected in approx-imately 2 months. A final report will be issued at that time. Submitted by:  ! Gw C Approved by: YM f;h9w d// Concurrence by: )kE

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                        .                                                       Howe-ll-78 I                                                                          Pege 1 of 2

SUBJECT:

MCAR # 19 (Issued 11-7-77) INTERIM REPORT # 3 , DATE: / ~2O - 70 PROJECT: Consumers Power Company Midland Plant Units 1 & 2 Bechtel Job 7220 Status of Corrective Action and Investigation Grinnell submitted for approval their " Visual and Dimensional Acceptance Criteria for Welds" per their revised Quality Assurance / Quality Control Procedure 02A006 dated 12/8/77 to allow undersize / oversize tolerances on fillet welds. The undersize tolerances were not accepted. It is noted in the rejection of the undersize tolerance that, in order to accept these or any other undersized weld tolerances, it will be necessary for ITT Grinnell to supply written confir=ation from the appropriate ASME committee that such a criteria is consistent with the intent of the ASME B&PV Code, Section III, Div.1, Subsection NF (1974), Paragraph NF-4222, and manda-tory Appendix XVII to this Code section, Subparagraph XVII-2452.1 and Table XVII-2452.1-1. The oversize weld tolerances were accepted provided the actual weld size exceeds the minimum weld size specified by the appropriate code require-ments. The oversize weld tolerances as follows: a) Nominal weld sizes up to and including 1/4", plus 1/8" tolerance b) Nominal weld sizes over 1/4" and up to and including 1/2", i plus 3/16" tolerance ! c) All weld sizes over 1/2", plus 1/4" tolerance ! The other acceptance criteria provided in Grinnell's Visual and Dimensional Acceptance Criteria for welds was found acceptabia. l Grinnell-issued a statement on 12/30/77 that the calculations for each of the 36 shop weld found undersized on the random 125 hangers inspected by , Bechtel field QA personnel were found to be within the NF Code allowable stresses. All calculations were based on the smallest cross section of the welds. e e

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Attschment 2 How3-ll-78 7 'Page 2 of 2 Grinnell is preparing a report that will include all detailed calculations along with an analysis of stresses to justify the acceptability of the undersized welds. This report is to be provided by Grinnell 1/26/78. Forecast Date on Corrective Action Grinnell's summary report continues to be expected by Bechtel within January. A final report would then follow. Submitted by: [#/[/ Approved by: /M Concurrence by: 1 - f/20/78 W

m Attschment 3

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ITT-Grinnell, II-106-I.C (Hangers)  ; . h As depicted in Chart No. I1, there were a total of thirty (30)

                                                                           "Q-Listed" ha6gers with welds that .were receipt inspected during tl}is reporting period. There vere eight (8) during the first half of the period and 2.2 during the second half.

h "None of these welds were found to be nonconforming (excluding i oversized welds) because of undersize or visually rejectable j welds: . 1 100% receipt inspection of 'the welds on hangers will continue until the l 1

• final resolution of 1:C/.R #19.and until assurance that the corrective action taken is effective. .

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