ML19289C716
| ML19289C716 | |
| Person / Time | |
|---|---|
| Site: | Atlantic Nuclear Power Plant  |
| Issue date: | 12/15/1978 |
| From: | Obrien J NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| To: | Sohinki S NRC OFFICE OF THE EXECUTIVE LEGAL DIRECTOR (OELD) |
| Shared Package | |
| ML19289C715 | List: |
| References | |
| NUDOCS 7901220157 | |
| Download: ML19289C716 (2) | |
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DEC 15 1R8 MEMORANDUM FOR:
Stephen M. Schinki Counsel for the NRC Staff Office of Executive Legal Director FROM:
John O'Brien Mechanical Engineering Research Branch
SUBJECT:
NEW IriFORMATI0fl Ofl TURBIT'E MISSILE It' PACTS AGAINST STEEL TARGETS In a memorandum to you dated November 15, 1976, I submitted a revised testimony indicating that for the Floating f!uclear Power Plant design overspeed turbine missiles would not perforate the 4.5 inch turbine missile shield and that destructive overspeed turbine missiles cculd perforate with velocities as high as 540 fps. This testimony was based on an application of the BRL formula endorsed in R.G.115 to the turbine internals and casing.
Tests conducted recently by EPRI indicate that the BRL formula may be unconservative. Specifically, a missile weighing 3,365 pounds impacted a 5 inch thick missile shield at 485 fps and passed through with a "elocity of 325 fps'.
The BRL formJla indicates that a 3.7 inch thick shield should completely stop the missile.
The BRL formula evidently overestimated steel barrier resistance in this case. This is due in large measure to the fact that the BRL formula was developed for flat plates supported along four edges and not for the ring configuration supported along two edges as in the EPRI tests. Moreover, the BRL formula related to blunt nose missiles and not to the sharp nosed.urbine missile segment tested and discussed above.
While the EPRI tests do not exactly simulate the real situation for the Ff P, the use of the BRL formula is not supported by the limited data available and the effectiveness of the turbine missile shield now requires further evaluation. A copy of the EPRI report documenting these tests is enclosed.
w.
i John O'Brien Mechanical Engineering Researco Branch Division of Reactor Safety Research
Enclosure:
As stated See cc's next page 7901220W1
4 1-cc:
J. Costello, RES w/o encis.
J. Knight, DSS w/o encls.
F. Schauer, DSS w/o enci R. Birkel, LUR 2
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