ML20088A537
| ML20088A537 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 03/30/1984 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 28071, 83-03-#4, 83-3-#4, OL, OM, NUDOCS 8404120171 | |
| Download: ML20088A537 (5) | |
Text
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General offices: 1945 West ParneH Road, Jackson, MI 49201 + (517) 788-0453 March 30, 1984 83-03 #4 f lNCIPAL STAFF HA 3 p 'php T
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US Nuc1 car Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND ENERGY CENTER PROJECT UNIT NO 1, DOCKET NO 50-329 UNIT NO 2, DOCKET No 50-330 CORE SUPPORT STRUCTURE BOLTING FILE:
0.4.9.75 SERIAL:
28071
References:
- 1) Letter, J W Cook to J G Keppler, Sarce Subject, dated May 19, 1983
- 2) Letter, J W Cook to J G Keppler, Same Subject, dated November 1, 1983
- 3) BAW 1784 " Summary Report of NRC/B&W Lynchburg Meeting on Reactor Vessel Internals Bolting, May 6, 1983"
- 4) Letter, J W Cook to J G Keppler, Serial 26649, dated January 9, 1984 Referenced Ictter #1 and the report (Reference #3) describe cracking of core support structure bolting,in operating B&W plants.
Referenced letters #2 and #4 describe the anticipated corrective actions. This letter updates reference 4.
In order to minimize the need for inservice replacement of core support structurebolting,ConsumersPowerhaselectedtoreplacethe(ASMESA453 Grade 660 (A-286) bolts with fasteners which have been fabriched from alternative materials as follows:
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83-03 #4 Serial 28071 Anticipated Completion Bolted Connection Replacement Material Unit 2 Unit 1 Upper Core Barrel Inconci X750-HTH 06/29/84 to Core Support Shield Lower Core Barrel 60-Inconel 06/29/84 to Lower Grid Assembly X750-HTH and 48-316 Stainless Steel Surveillance Specimen Inconel X750-HTH 06/29/84 Holder Tube to Thermal Shield Lower Grid Assembly Inconel X750-HTH Complete to Flow Distributor Upper Thermal Shield 316 Stainless Steel **
03/30/84 Restraint to Core Barrel Thermal Shield to Inconel Complete Comple te Lover Grid Assembly X750-HTH
- Schedules have not been established for Unit 1 but plans call for replacements to be complete prior to system hydrostatic testing.
- Due to galling during removal, remnants of some A-286 bolts will be left in this joint. In each case, two of the three bolts holding the restraint block to the core barrel will be replaced. Two bolts are sufficient to maintain joint integrity.
j The safety implications of failed core support structure bolting have not been specifically determined for Midland. Section 4 of Reference 3 does describe the safety implications associated with the failure of the upper and lower core barrel joints and concludes that failure of the joint would not be a significant safety concern. Because these bolts perform the most significant core support function, even though core support structure bolting failure may not be a significant safety concern, Consumers Power Company considers this condition reportable under the criteria of 10 CFR 50.55(e).
l An FSAR change notice has been initiated to reficct the new bolting materials. Field change packages and piece part drawings have been issued to support the replacement activities. The detailed design analysis of the design changes is finished pending final B&W reviews. The reactor internal assembly drawing will be revised following the accomplishment of the change out of the bolting materials. The B&W Owners Group Bolting Task Force is preparing a report describing the problem and the corrective actions.
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3 83-03 #4 Serial 28071 Another report will be submitted on or before September 28, 1984.
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CC Document Control Desk, NRC Washington, DC R J Cook, NRC Inspector Midland Site DHood, NRC Office of NRR Washington, DC INPO Records Center OC0384-0044A-MP01
4 83-03 #4 Serial 28071 OM/0L SERVICE LIST Mr Frank J Kelley Atomic Safety & Licensing Attorney General of the Appeal Board State of Michigan U S Nuclear Regulatory Commission Ms Carole Steinberg Washington, DC 20555 Assistant Attorney General Environmental Protection Division Mr C R Stephens (3) 720 Law Building Chief, Docketing & Services Lansing, MI 48913 U S Nucicar Regulatory Commission Office of the Secretary Washington, DC 20555 Mr Myron M Cherry, Esq Suite 3700 Ms Mary SL. clair Three First National Plaza 5711 Summerset Street Chicago, IL 60602 Midland, MI 48640 Mr Wendell H Marshall Mr William D Paton, Esq RFD 10 Counsel for the NRC Staff Midland, MI 48640 U S Nuclear Regulatory Commission Washington, DC 20555 Mr Charles Bechhoefer, Esq Atomic Safety & Licensing Atomic Safety & Licensing Board Panel Board Panel U S Nucienr Regulatory Commission U S Nuclear Regulatory Commission East-West Towers, Room E-413 Washington, DC 20555 Bethesda, MD 20014 Ms Barbara Stamaris Dr Frederick P Cowan 5795 North River Road 6152 N Verde Trail Rt 3 l
Apt B-125 Freeland, MI 48623 Boca Raton, FL 33433 j
Dr Jerry Harbour i
Mr Fred C Williams Atomic Safety & Licensing Isham, Lincoln & Beale Board Panel 1120 Connecticut Ave, NW, Suite 840 U S Nuclear Regulatory Commission f
Washington, DC 20036 East-West Towers, Room E-454 Bethesda, MD 20014 l
Mr James E Brunner, Esq Consumers Power Company Mr M I Miller, Esq 212 West Michigan Avenue Isham, Lincoln & Beale Jackson, MI 49201 Three First National Plaza 52nd Floor Chicago, IL 60602 OC0384-0044A-MP01 o
5 83-03 #4 Serial 28071 Mr D F Judd Babcock & Wilcox PO Box 1260 Mr John Demeester, Esq Lynchburg, VA 24505 Dow Chemical Building Michigan Division i
Mr Steve Gadler, Esq Midland MI 48640 2120 Carter Avenue St Paul, MN 55108 Ms Lynne Bernabei Government Accountability Project Mr P Robert Brown 1901 Q Street, NW Clark, Klein & 3eaumont Washington, DC 20009 1600 First Federal Bldg j
Woodward Ave Detroit, MI 48226 3/14/84 T
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OC0384-0044A-MP01
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