ML20203P286
| ML20203P286 | |
| Person / Time | |
|---|---|
| Site: | 07109198 |
| Issue date: | 03/20/1986 |
| From: | GESELLSCHAFT FUER NUKLEAR SERVICE, MBH |
| To: | Macdonald C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 26768, NUDOCS 8605060516 | |
| Download: ML20203P286 (4) | |
Text
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GNS RETURN 1 0 396-5S 90s
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Gese4chcW Kuaor 5.-v.ce mt*t EI ' 28 P ? $3 g
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Mr. Charles E. MacDonald, Chief S
Transportation certification Branch RECElVED Division of Fuel Cycle and Material 2
2 Safety, NMSS
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APR 7 $30
- U.S. Nuclear Regulatory Commission f (Luxtie nA W f /
7915 Eastern Avenue
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Rt/Wo 7220-110 March 20, 1986 Subjects GNS CASMR-MTR
' ice s a) Memorandum from Charles E. MacDonald about summary of Meeting with GNS concerning drop test of CASTOR-MTR, dated February 27, 1986 p
1 WE b) Memorandum from R. Odegaarden (NRC) summarizing meeting with GNS on CASTOR-MTR - November 25, 1985
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ne c) 19 Questions in the letter from Charles E.
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MacDonald, dated February 23, 1984 NS Dea -Mr. MacDonald:
We have rec,eived the reference a) HRC letter. In reviewing the referenced NRC meeting minutes, it is important that we clarify some of the points addressed.
T 1.
SELECTICN CF THE MTR DROP TEST CASK It was the stipulation of the NRC at the meeting on November 20, e*g 1985 that the test cask be selected as the one of the five h
existing casks with the lowest fracture toughness (KlD) value. In that meeting questions 6 and 15 (of the 19 questions) concerning og h
the definition of the important material properties and their relationship to flaw size were discussed in regard to cask drop
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testing. In particular it was discussed using the cask with the gg s a.u
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GNS Gesellschob IGr Nukleo* Service =bH lowest fracture toughness value'(KlD) to determine the flaw would serve as the depth. Consequently, it was decided that KlD sole basis for the selection of the test cask.
GNS then sampled and evaluated each of the five casks to ascertain core bar material properties which were then used to select the cask with the lowest K values. The cask actually gp used for the drop test was the cask with the lowest K values.
gp However, review of the properties for all five casks are comparable within a narrow band of statistical deviation.
Furthermore all material values were made available to the authorities before the actual drop test.
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Overload tests j
I Several conenents were made in the reference a) letter concerning NRC knowledge of overload testing of cast iron casks in Germany. This was never concealed from NRC and had been mentioned in several prior discussions since 19F4. The last time, GNS staff had discussed this item in det,sil in 4
the November 20, 1985 meeting with regard to question 18, i
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The key point is the exact purpose and nature of the BAM tests. For a number of reasons, the overload tests performed i
by BAM were of a scientific exploratory nature only. They i
have no direct relationship to the regulatory tests required for either IAEA or US-NRC certification of spent fuel, Type j
B packages. The material fracture occured in these tests, f
but this cannot be designated as fallure.
On the contrary, in about 100 drop tests performed under t
Type B conditions, not a single failure of nodular cast iron has occured.
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! i The main differences from testing within the framework of licensing are i
a)
All casks used were cask rejects, obsolete and out of specification. The casks were originally made to replace concrete casks and to meet the requirements for strong industrial packaging only. The material properties lay between those for gray cast-iron and nodular cast-iron.
The casks.used.were predamaged, 1. e. they had been used in b) previous, des,tructive. tests lamong others, 900 m drops).
c)
The tests were performed without impact limiters. Hence, the deceleration g-loads were several'thousand g's versus 100 -
200 g's experienced in Type B tests with casks with impact limiters.
1 The German competent 'autihorities confirm the f act that the tests were for scientific purposes only. A report was published in January 1984, containing._the scientific results of the overload tests.
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GNS will submit a report next week giving details of the facts mentioned above.
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Yours sincerely, j
GNS Gesellschaft fur Nukl ar-isrvice mbH
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