ML20090H597
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o UNITED STATES E*
NUCLEAR REGULATORY COMMISSION o
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.,I wAsMNGTON, D. C. 20555 L
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FEB 13 1984 l
Docket Nos. 50-329/330 l
l MEMORANDUM FOR: Thomas M. Novak, Assistant Director for Licensing 1
Division of Licensing l
FROM:
William V. Johnston, Assistant Director Materials, Chemical & Environmental Technology Division of Engineering
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SUBJECT:
TASK INTERFACE AGREEMENT 83-78, REGION III i
i REQUEST FOR DESIGN ADEQUACY OF THE MIDLAND HVAC SYSTEMS (TAC #52311)
In a previous memorandum on this subject dated January 24, 19'84, mention
-l was made of materials discrepancies, which had been identified that were 1
not expected to cause operating problems with the HVAC system. Specifi-1 cally, this referred to bolts from Midland which had been hardness tested.
i Of the nine (9) ASTM A307 bolts selected by Region III for testing by
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Franklin Research Center, four (4) exceeded the maximum hardness for ASTM A307 Grade A.
Another bolt exceeded the hardness maximum for I
Grade B but not the hardness maximum for Grade A.
However, ASTM A307-4 states (in 1.2) "If no grade is specified in the inquiry,- contract or i
orders,' Grade A bolts shall be furnished." As no grade was stated in the information provided, it is assumed that all bolts were Grade A so only four (4) of the nine (9) tested exceeded specification requirements.
The maximum hardness found on these four bolts was Rockwell C 29.
In a telecon between W. Hazelton of MTEB and D. Danielson of Region III, it was agreed that MTEB would determine the preload necessary to merit concern for potential stress corrosion failur'e and Region III would perform a breakaway torque test on a selected sample of installed bolts 1
of the same type exhibiting the high hardness.
Calculations have been performed that demonstrate that the sub'ect bolts, j
although in excess of the specification requirements, would probably not be in a stress corrosion regime at Rockwell C values much below Rockwell
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C 35.
Because the highest hardness found in the Midland sample bolts
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was Rockwell C 29, we conclude that torque testing of the installed bolts i
is not necessary.
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William V. Johnston#, Assistant Director-Materials, Chemical:& Environmental
-Technology Division of Engineering cc:
See Page 2 J
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Thomas M. Novak !
cc:
R. Vollmer D. Eisenhut E. Sullivan R. Bosnak J. P. Knight L. Rubenstein
- 0. Parr E. Adensam M. Miller D. Hood D. Terao W. Le Fave j
B. D. Liaw j
S. Pawlicki W. Hazelton R. Klecker l
C. Y. Cheng l
C. D. Sellers l
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DISTRIBUTION:
DMB - Docket Files MTEB Reading Files MTEB Midland Files
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DE:MTEB(D2 DE:MTEBh D
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- C C. D. Sellers: jar W. Hazelton 0,9[
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iaw W. V. Johnston 2/9/84 2/ f /84 2/ g
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