ML20087N761
| ML20087N761 | |
| 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 | |
| 83-03-#4, 83-3-#4, NUDOCS 8404040314 | |
| Download: ML20087N761 (5) | |
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Vice President - Projects, Engineering and Construction y (;; y COCK.!!?di 1 SEi1VN General offices: 1945 Wesi Pernall Road, Jackson, MI 49201 * (51i h81hd53 March 30, 1984 83-03 #4 Mr J G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III 799 Rocsevelt 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, Same 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 letter #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 structure bolting, Consumers Power has elected to replace the ASME SA 453 Grade 660 (A-286) bolts with fasteners which have been fabricated from alternative materials as follows:
8404040314 840330 PDR ADOCK 05000329 Q
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2 83-03 #4 Serial 28071 i
Anticipated Completion Bolted Connection Replacement Material Unit 2 Unit 1 Upper Core Barrel Inconel X750-HTH 06/29/84 to Core Support Shield 1
Lower Core Barret 60-Inconal 06/29/84 to Lower Grid Assembly X750-HTH and 48-316 Stainless Steel l
Surveillance Specimen Inconel X750-HTH 06/29/84 Holder Tube to Thermal Shield Lower Grid Assembly Inconal X750-HTH Complete to Flow Distributor Upper Thermal Shield 316 Stainless Steel **
03/30/84 Restraint to Core Barrel Thermal Shield to Inconel Complete Complete i
Lower 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 -
4 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.
The safety implications of failed core support structura 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 b's a significant safety concern.- Because these bolts perfona' 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)..
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An FSAR change notice has been initiated to reflect 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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Serial 28071 i
j 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, N 'C Office of NRR Washington, DC INPO Records Center d
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4 83-03 #4 Serial 28071 OM/0L SERVICE LIT]
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 Ceneral Environmental Protection Division Mr C R Stephens (3) 720 Law Building Chief, Docketing & Services Lansing, MI 48913 U S Nuclear Regulatory Commission Office of the Secretary Washington, DC 20555 Mr Myron M Cherry, Esq Suite 3700 Ms Mary Sinclair 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 Regulatery Commission Washington, DC 20555 Mr Charles Bechhoefer, Esq A'tomic Safety & Licensing Atomic Safety & Licensing Board Panet Board Panel U S Nuclear 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 Apt B-125 Freeland, MI 48623 Boca Raton, FL 33433 Dr Jerry Harbour Mr Fred C Williams Atomic Safety &~ Licensing Isham, Lincoln & Beale Board Panel 1120 Connecticut Ave, NW, Suite 840 U S Nuclear Regulatory Commission Washington, DC 20036 East-West Towers, Room E-454
-Bethesda, MD 20014 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
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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 l
Mr Steve Gadler, Esq Midland MI 48640 2120 Carter Avenue s
St Paul, MN 55108 Ms Lynne Bernabei Government Accountability Project Mr P Robert Brown 1901 Q Street, NW Clark, Klein & Beaumont Washington, DC 20009 1600 First Federal Bldg Woodward Ave Detroit, M1 48226 3/14/84
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