ML20079E227
| ML20079E227 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 01/09/1984 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 26649, 83-03-#3, 83-3-#3, NUDOCS 8401170184 | |
| Download: ML20079E227 (4) | |
Text
.3 Consumm Power James W Cook hew Vice President - Projects, Engineering and Construction oeneral offices: 1945 West Parnell Road, Jackson, MI 49201 + (517) 788-0453 January 9, 1984 83-03 #3 M
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~M Mr'J G Keppler, Regional Administrator hg rIIU jj US Nuclear Regulatory Commission w
3 Region III
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799 Roosevelt Road Glen Ellyn, IL. 60137 MIDLAND ENERGY CENTER PROJECT UNIT NO 1. POCKET N3 50-329 UNIT. - NO 2, LOCKET NO 50-330 COD. SUPPORT STRUCTURE BOLTING FILE:
0.4.9.75 SERIAL:.26649
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 '.784 " Summary-Report of NRC/B&W Lynchburg Meeting on Reactor Vessel Internals Bolting, May 6, 1983" The referenced letter and the report describe cracking of core support structure bolting in operating B&W plants.
Referenced letter #2 describes the anticipated corrective actions. This
-2etter updates reference 2.
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:
8401170164 840109 PDR ADDCK 05000329 S
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1 83-03 #3 Serial 26649 Anticipated Completion Bolted Connection Replacement Material Unit 2 Unit 1 Upper Core Barrel Inconel X750-HTH 03/01/84 to Core Support Shield Lower Core Barrel 60-Inconel 03/01/84 to Lower Crid Assembly X750-HTH and 48-316 Stainless Steel Surveillance Specinen Inconel X750-HTH 03/01/84 Holder Tube to Thermal Shield Lower Grid Assembly Inconel X750-HTH 03/01/84 to Flow Distributor Upper Thermal Shield 316 Stainless Steel **
03/01/84 Restraint to Core Barrel Thermal Shield to Inconel Complete Complete Lower Grid Assembly X750-HTH
- Schedules have not been established for Unit 1 but plans call for replacanents to be complete prior to system hydroccatic 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.
The safety implications of failed core support structure boltirs has not been specifically determined tor 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 fcilure may not be a significant safety concern, Consumers Power Company considets this condition reportable under the criteria of 10 CFR 50.55(e).
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 reviewe. The reactor internal assembly drawing-will be revised following the accomplishment of the change out of the bolting materials. Another report will be submitted on or before March 30s 1984.
JWC/HWS/rlm OC0184-0002A-MP01
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3 83-03 #3 Serial 26649 ment Control Desk, NRC-
.ngton,-DC-Cook, NRC Inspector A
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4 83-03 #3 Serial 26649 OM/OL 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, Esq Wa.Lington, DC 20555 Assistant Attorney General Environmental Protection Division Mr C R Stephens (3) 720 Law Building Chief, Docketing & Services trusing, MI 48913 U S Nuclear Regulatory Commission Office of the Secretary Washington, DC 20555 Mr Myron M Cherry, Esq
-Suite 3700 Ms Mary Sincicir 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, M1 48640 U S Nuclear Regulatory Conmissicn Washington, DC 20555 Mr Charles Bechhoefer, Esq Atomic Safety & Licensf.ng.
Atomic Safety & Licensing Board Panel Board Panel U S Nuclear Regulatory Commission U S Nuclear Regulatory Commission Washington, DC 20555 Weahington, DC 20555 Dr Frederick P Cowan Ms Barbara Stamiris 6152 N Verde Trail 5795 North River Road Apt:B-125 Rt 3 Boca Raton, FL 33433 Freeland. MI 48623 Mr-Fred C Williams.
Mr Jerry Harboor isham, Lincolt, 6 Beale Atomic Safety & Licensing 1120 Connecticut' Ave, NW, Suite 325 Board Panel Washington, DC 20036 U S Nuclear Regulatory Commissien Washington, DC 20555 Mr James E Brunner, Esq Mr M I Miller, Esq Consumers Power Company Isham, Lincoln & Beale 212 West Michigan Avenue Three First National Plaza Jackson, MI-49201 52nd Floor Chicago, IL 60602 Mr D F Judd Mr John Demeester, Esq Babcock i V11 coy Dow Chemical Building P'O Box 1260~
Michigan Division Lynchburg, VA 24505 Midland, MI 48640 Mr Steve Cadler, Esq Ms Lynne Bernebei 2120 Carter Avenue Government Accountability Project St Paul, MN 55108 1901 Q Street, NW Washington, DC 20009 OC0184-0002A-MP01
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