ML20084B265
| ML20084B265 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 04/02/1984 |
| From: | Mangan C NIAGARA MOHAWK POWER CORP. |
| To: | Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| (NMP2L-0022), (NMP2L-22), IEB-79-02, IEB-79-2, NUDOCS 8404260136 | |
| Download: ML20084B265 (1) | |
Text
M Y NIAGARA R UMOHAWK NIAGARA MOHAWK POWER CORPORATION /300 ER;E BOULEVARD WEST SYRACUSE. N Y.13202/ TELEPHONE (315) 474-1511 April 2, 1984 (NMP2L 0022)
Mr. R. W. Starostecki, Director U.S. Nuclear Regulatory Commission Region I Division of Project and Resident Programs 631 Park Avenue King of Prussia, PA 19406 Re: Nine Mile Point Unit 2 Docket No. 50-410
Dear Mr. Starostecki:
The following provides a clarification to our July 10, 1979 letter concerning I.E.Bulletin 79-02, " Pipe Support Baseplate Designs Using Concrete Expansion Anchor Bolts."
Response 4(a) should be revised to read as follows:
a.
All anchors are set to a prescribed preload as determined in the onsite test program.
It is recognized that over a period of time anchors will lose varying amounts of preload.
However, the design does not require any remaining preload to assure a safety factor of 4.
In recent tests at Hanford Engineering Development Labs regarding NUREG/CR2999 HEDL-MISC-7246, a final report by United States Nuclear Regulatory Commission entitled " Anchor Bolt Study - Data Survey and Dynamic Testing" concluded, "The ultimate strength, under low cycle dynamic loading, of the anchors tested was not affected by initial preload level." Preload is not a requirement for the anchor bolts using the design criteria for Nine Mile Point Unit 2.
Very truly yours, 84o4260136 840402 QAyWLpq f ADEK 05000 C. V. Mangaiv Vice. President
. Nuclear Engineering & Licensing -
CVM/TL:ja xc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 R. A. Gramm, Resident Inspector 4
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