ML20054D791
| ML20054D791 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 04/14/1982 |
| From: | Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 16633, NUDOCS 8204230388 | |
| Download: ML20054D791 (4) | |
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Power J.mes W Cook Company m, ~,u,.,- ~ gc, o e., y and construc c.n.r.: ome : 194s w t P.,n.li Ro.d, J.ckson, MI 49201 e (517) 788-0453
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April 14, 1982
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p N-lu I -r liarold R Denton, Director
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Office of Nuclear Reactor Regulation Division of Licensing US Niiclear Regulatory Commission Washington, DC 20555 MIDLAND PROJECT MIDLAND DOCKET NO 50-329, 50-330 SAFETY EVALUATION REPORT INFORMATION FILE:
0505.16 SERIAL:
16633 ENCLOSURE: TELECON RECORD DATED APRIL 12, 1982 The enclosure provides information requested by the NRC staff in their review of the Midland FSAR for preparation of the Safety Evaluation Report. The telecon record resolves NRC Open Issue No 5 from the April 6, 1982 Midland computer 1ist of NRC open issues. This information will be included in the forthcoming FSAR Revision 44.
JWC/WJC/dsb CC IIBrammer, NRC, w/a RJCook, Midland Resident Inspector, w/a RHernan, NRC, w/a RWiluston, Washington, w/a DBMiller, Midland, w/a l
Bf' 890493 0 333 oc0482-0067a100
CONSUMERS POWER COMPANY Midland Units 1 and 2 Docket No 50-329, 50-330 Letter Serial 16633 Dated April 14, 1982 At the request of the Commission and pursuant to the Atomic Energy Act of 1954, and the Energy Reorganization Act of 1974, as amended and the Commission's Rules and Regulations thereunder, Consumers Power Company submits 7
Safety Evaluation Report Information, Serial 16633 dated April 14, 1982. The information included in the submittal closes NRC Open Issue No 5 concerning pipe whip restraint design and the dynamic influence factor.
CONSUMERS
.R COMPANY By
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W Cool, Vice Pfesident Proj ts, Engineering and Construction Sworn and subscribed before me this 19th day of April 1982.
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Notary Public 1
Jackson County, Michigan My Commission Expires September 8, 1984
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MILT 7D P2iOJEC-SAFETY & LICENSING DEPARTMENT Copics To:
TELECON RECORD
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TJS X Date h/12/82 Participants Comrany EMB X J Bramer NRC TRT X Dr S Hou NRC BFHenley CPCo BFH X WJCloutier
/h CPCo RAW X RCB X DLP X
SUBJECT:
FWH X Dynamic Influence Factor (DIF) for Pipe DFLewis X Whip Restraint Design.
meurtis X
M Egaal'y X File 0505.803 DISCUSSION:
In some preliminary discussions with J Brammer on the DIF it became evident that the crux of the confusion on this issue was that the Bechtel civil department responsible for designing the Midland HELBA restraints was usirs; a civil design criteria to determine design yield strength values.
BPC should have been using the NRC Mechanical Engineering Branch (MEB) technical position as design guides because they are responsible for the review and acceptance of the HELBA restraints.
In comparing the results of the two differing design criteria it was evident that the two design criteria were equally conservative.
Bruce Henley explained the BPC civil design criteria to Dr S Hou It consist of an upper bound yield value Fyu and a lower bound yield value FyL.
'T'he upper bound value is used to obtain embedment forces. The 1caer bound yield strength Fyt is based on the ASTM minimum specified yield strength Fy and it is used to design the restraint. Fy is multiplied by a safety factor (.9) per civil design guides, then by the DIF (1.20) to account.for strain rate effects. Parametrically this combination is as follows:
FyL =.9Fy (1.2) = 1.o8Fy There are no multiplication factors applied to the upper bound value. For instance, the values used for A516 G.R. 55 material are FyL = 30Kai X o.9 X 1.2 = 32.4Ksi Fyu = 50Ksi Dr G Hou explained the MEB position was based on Sy the code minimum yicid strength times a 10% DIF. Parametrically this equation is S = 1.10Sy.
We agreed that both methods were equally conservative even though the DIF Midland is using is higher than the recommended MEB value.
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Continued Page 2 Bill Cloutier comitted to change the FSAR to reflect that Midland would use either Fyn =.9Fy (1.2) - BPC civil design guide or S = 1.lOSy - MEB Technical position for restraint design. Also, Midland uses an upper bound yield strength Fyu for embedment design.
Both Jim Bramer and 'S Hou agreed that for individual cases the Staff would consider the use of higher DIF or higher yield strength values if the cases could be substantiated with some justification,
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