ML20080A989
| ML20080A989 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 01/31/1984 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| REF-SSINS-6820 27991, IEB-79-02, IEB-79-2, NUDOCS 8402060416 | |
| Download: ML20080A989 (6) | |
Text
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C0HSUD1 BIS l' power i Pr sU
- Projects, Engineering and Construction General C..as: 1945 West Pernali Road, Jackson, MI 49201 * (517) 788-0453 January 31, 1984 Mr J G Keppler, Regional Administrator US Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND ENERGY CENTER PROJLOT DOCKET NOS 50-329 AND 50-330 IE BULLETIN 79-02 FILE: 0505.12 SERIAL:
27991
References:
CPCo letters to J G Keppler; Midland Project; Docket Nos 50-329, 50-330; IE Bulletin 79-02:
- 1) Serial Howe-195-79; dated July 3, 1979
- 2) Serial Howe-233-79; dated August 15, 1979
- 3) Serial Howe-84-80; dated May 7, 1980
- 4) Serial 9107; dated June 9, 1980
- 5) Serial 10049; dated October 31, 1980 6)
Serial 11505; dated February 26, 1981
- 7) Serial 14636; dated December 15, 1981
- 8) Serial 17510; dated June 1, 1982 9)
Serial 20684, dated Janua*y 28, 1983 10)
Serial 23757, dated July 28, 1983 References 1 through 10 are correspondence which address IE Bulletin 79-02.
References 3 through 10 reported that further evaluations and corrective actions were required to completely address 79-02. provides another interim report on this subject.
The three remaining items required in order to complete all actions necessary to close the 79-02 issue are:
1.
Completion of pipe support review against the criteria regarding expansion anchor usage within the first two supports of a pump nozzle.
This review is identified as Item 1A in the attachment to this letter.
2.
Completion of review of the pipe supports for new seismic loadings resulting from seismic reanalysis. This is Item IC in the attachment to this letter.
8402060416 840131 PDR ADOCK 05000329 G
PDR OC0184-0043A-MP01 2 JSSf
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Serial 27991
'3.
Completion of inspection of the accessible pipe support expansion
_ anchors in. conjunction with the CCP. This is Item 6 in the attachment to this letter.
Either a final response or a status report will lua provided by
-December 31, 1984.
-3 JWC/JPK/cd
Attachment:
- Report For I&E Bulletin 79-02, ated January 12,-1984 CC Document Control Desk, NRC Washington, DC
-RJCook, NRC Resident Inspector Midland Nuclear Plant DHood, NRC Office of NRR INPO Records Center OC0184-0043A-MP01
m.
3 Serial 27991 DM/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, Esq 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 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 Regulatory Commission Washington, DC 20555 Mr Charles Bechhoefer, Esq Atomic Safety & Licensing Atomic Safety & Licensing Board Panel Board Panel U S Nuclear Regulatory Commission U S Nuclear Regulatory Commission Washington, DC 20555 Washington, 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 Dr Jerry Harbour Isham, Lincoln & Beale Atomic Safety & Licensing 1120 Connecticut Ave, NW, Suite 325 Board Panel Washington, DC 20036 U S Nuclear Regulatory Commission Washington, DC ?0555 Mr James E Brunner, Esq Mr M I Miller,.sq 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 & Wilcox Dow Chemical Building PO Box 1260 Michigan Division Lynchburg, VA 24505 Midland, MI 48640 Mr Steve Gadler, Esq Ms Lynne Bernabei 2120 Carter Avenue Government Accountability Project St Paul, MN 55108 1901 Q Street, NW Washington, DC 20009 September 6, 1983 OC0184-0043A-MP01
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Attachment to Serial 27991 Page 1 of 3 REPORT FOR I&E BULLETIN 79-02
SUBJECT:
I&E BULLETIN 79-02
" PIPE SUPPORT BASE PLATE DESIGNS USING CONCRETE EXPANSION ANCHOR BOLTS" INTERIM REPORT DATE: January 12, 1984 1.
Anchor Bolt Use Prohibition a.
An agreement has been reached with the original pipe support design agency to allow a one-time design deviation that permits expansion anchor bolts to remain in the first two supports on either side of a pump, provided the calculated bolt load is 25% or less of the anchor bolt specification allowable. Pipe supports that do not meet these criteria are being identified and corrected as part of the reviews described in le below.
Implementation of the rework, if any, will be accomplished in accordance with the construction completion program.
b.
The original pipe support design agency has prepared a report to document their design methodology for base plate design.
Bechtel review of the first submittal of this report has been completed, and Bechtel comments have been addressed by that design agracy in a revised report.
Bechtel review of the revised report has been completed with no additional comments. This report has been accepted by Bechtel.
c.
Discrepant pipe support designs issued by the original pipe support design agency and documented on nonconformance reports l
have been diepositioned. All pipe support designs issued by that primary pipe support design agency are being rereviewed for proper anchor bolt usage. This review is now being conducted to a priority based on the seismic reanalysis schedule rather than the turnovar schedule as previously stated. The new schedule for
.pletion of the review is now anticipated to be June, 1984 ror all areas except inside unit No. I containment. A schedule for the latter is currently being developed and will be addressed in the next report.
2.
Determination of Proper Embedment Depth a.
The inspection of anchor bolts used for pipe supports is addressed in Section 6.
e c.
Page 2 of 3 b.
It has been concluded that no further testing and inspection for embedment depth is required for expansion anchors used on non pipe support applications. This conclusion is based on the results of the reinspections of expansion anchors used on pipe supports, and heating, ventilating, and air conditioning Seismic Category I support applications.
Reinspection and testing-in accordance with project specifications (issued to satisfy the requirements of I&E Bulletin 79-02) for pipe support anchors installed before May 30,-1980, was completed. Of 1,631 expansion anchors reinspected, 65 did not meet the requirements for embedment depth. These results indicate, with a 95% confidence level, that over 95% of the anchors satisfies the criteria for embedment length. Additional reinspection and testing of expansion anchors used for heating, ventilating, and air conditioning Seismic Category I supports was performed. Of
' 4,565 expansion anchors reinspected, 72 did not meet the requirements for embedment depth. These results also indicate, with a 95% confidence level, that over 95% of the anchors satisfies the criteria for embedment depth.
c.
The controls initiated in May, 1980 for length marking and quality control inspection (MCAR 31) provide assurance that embedment depth will not pose a problem.
3.-
Demonstration of Achievement of Required Factor of Safety Midland-specific tests to determine the amount of preload a.
remaining in the bolt indicate that an average of 37% of the original preload remains in the bolt after 1 year. Other tests (References A and B) have established that the amount of preload on the bolts will not affect the performance of the anchorage.
If the initial installation torque on the bolt accomplishes the purpose of setting the wedge, then the ultimate capacity of the bolt is not affected by the amount of preload present in the bolt at the time of cyclic loading. These tests (Reference A and B) indicate no anchor pullout failures occurred as a result of cyclic loading and that preload is not required to withstand cyclic loading.
b.
An additional static tension test (Reference C) to supplement the manuf acturer's data was completed. The final report, combined with the manufacturer's data, establishes that all sizes of expansion anchors used for pipe supports under the scope of I&E Bulletin 79-02 on the Midland project met the required factor of safety for pullout.
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Page 3 of 3 MCAR Status a.
MCAR 34:
Bechtel Management Corrective Action Report (MCAR) 34 final report, concerning installed drop-in anchors, has been issued.. No.further new corrective action is required.
Required rework has been completed and MCAR 34 was closed on December 14, 1982.
b.
MCAR 31:
MCAR 31 revised final report, concerning embedment-depth of expensian anchors, was issued May 10, 1982. Corrective actions associated with MCAR 31 are complete and the MCAR was closed on May 24, 1982.
5.
Reportability Review Review of the results of the inspection and tests identified no 4
items with a safety impact. Results of future analyses will be reveiwed for reportability under 10 CFR 50.55(e).
6.
Additional Expansion Anchor Inspections Inspection of '100% of the accessible pipe support expansion anchors installed before May 30, 1980, is complete. An evaluation of the adequacy of the inaccessible anchors (less than 6.7% for any parameters), based on the inspection results of the accessible anchors, is complete. As a result of this review, it has been determined that no rework of the inaccessible anchors is required.
Identification and completion of the rework for the inspected anchors is now approximately 90% complete. The remaining 10% will be reworked as part of the Construction Completion Program (CCP). A detailed schedule for system i
completion under CCP is currently being developed. Actual implementation is subject to NRC concurrence that work can proceed.
It is anticipated that an actual schedule will be available in early March, 1984.
l-REFERENCES
- A.
Teledyne Engineering Services Technical Report 3501-2 for Utilities /TES Owners Group Summary Repot Generic Response to US NRC I&E Bulletin 79-02.
B.
Commonwealth Edison Company Summary P.eport, Static, Dynamic and i
Relaxation Testing of Expansion Anchors in Response to NRC I&E Bulletin 79-02.
C.
Final Report on Concrete Expansion Anchor Static Tension Tests for Bechtel Power Corporation, March, 1982, Wiss, Janney, Elatner i
and Associates, Inc.
I l
- Tranmitter via J. Cook letter to J. Keppler dated January 28, 1983, Serial 20684.
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