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NUCLEAR REGULATORY COMMISSION REGION V q*
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June 13, 1984 MEMORANDUM FOR:
L. J. Chandler, Special Litigation Counsel FROM:
T. W. Bishop, Director, Division of Reactor Safety and Projects Region V
SUBJECT:
TUBE STEEL RADIl MEASUREMENTS The attached material provides evidence that the Diablo Canyon tube steel radii issue has been resolved. The attached information leads the staff to conclude that the previous affidavit submitted by Mr. Samuel D. Reynolds remains unaffected.
WD h T. W. Bishop Director Division of Reactor Safety and Projects, Region V Attachments:
1.
Letter from W. Wade (E.G.&G) to D. Kirsch (NRC) dated June 7,1984, Same Subject 2..
Memo from B. Wagner to D. Kirsch dated 1:ay 21,1984, Same Subject cc: Diablo Canyon Allegation File 92/93 H. Canter, RV T3 8603280144 860123 PDR FOIA DEVINE84-744 PDR D $ /// W~ (6
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,y v.. f watwut cas e x.caupoama sases MAY 211984 M ORAn UM FOR:
D. Kirsch, Chief, Reactor Projects Branch N FROM:
B. Wagner, Reactor Inspector THRC:
H. Canter, Chief. Engineering Section
SUBJECT:
TUBE STEE1. RADIl MEASUREMENTS re:
DCAF Allegations 92/93 Between May 14 and May 17, 1984, I performed an inspection on the ifcensee's methods of tube steel radii acasurement. I contacted a Bechtel and a PG&E employee during my examination of the measurement techniques.
Eleven pieces of tube steel varying in size from 3x2xl/4 to 6x6x3/8 vere examined using the tangent point method and a circle template or radius gage method.
Seven of the eleven samples had a perimeter of 14 inches or less.
In all cases, I was looking for radii to be greater than or equal to 2t where t is the thickness of the material.
In no case did I find radii less than 2t.
It is my engineering judgement that the tangent point method is not as reliable, as accurate or acceptable as the other method.
The most effective method is the template or radius gage method in which the sage is fit to the exterior band at the tube steel, thereby accurately determining the radii. This method most accurately matches the curvature of the outside bend. Also, the radius gage most effectively subtracts the effect of the imperfect corner radii that exist due to the rolling process by which the tube steel is manufactured.
In conclusion, I feel the best method of radii measurement is the template or radius gage method because of its accuracy and repeatability. Using this method on eleven samples of various perimeter tube steel used at Diablo Canyon, none were found to be less,than 2t.
M
. Wagne Reactor Inspector cc:
H. Canter DCAF 92/93 i
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TUBE STEEL MEASUREMENTS ITEM wraennen nannte LOC UNIT DESCRIPTION PART NO.
SIZE NO.
TPM 'l TEMPLATEUl R = 2t I
CACEW REONT5 Aum 2
Pipe Hanger 47-125R 3x3x1/4 (a) 11/32
> 1/2 1/2 Blds
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15/32
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3x3x1/4 (b) 14/32 1 1/2 12/32 Aux 2
Hanger 413-142 SL 6x6x3/8 (a) 30/32 3/4 Blds (Snubber Support) 3/4 4x4xt/4 (b) 1/2
> 1/2 1/2 14/32 4x4x1/4 (c) 1/2
~> 1/2 1/2 14/32 Aux 2
Pipe Hanger ISO No.
3x2x1/4 (a) 12/32 1 1/2 1/2 Bldg 2-9-1 14/32 3x2x1/4 (b) 14/32 1 1/2 1/2 11/32 Aux 2
Pipe Support 948-68 4x4xt/4 (a) 17/32 3 1/2 1/2 Bldg 15/32
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3x3x1/4 (b) 1/2 11/2 1/2 15/32 e
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.e-TUBE STEEL MEASUREPENTS (continued)
ITEM
_ _ _ NFARtfRFn RAnalTR R = 2t LOC UNIT DESCRIPTION PART NO.
SIZE NO.
TPM TEMPLATE"#
GAGE"#
REQNTS' I
Aux 2
Pullman Materials P.O. No.
3x3xt/4 (a) 12/32 1/2 1/2 1/2 Bldg Storage 14817 14/32 P.O. No.
3x3x3/8 (b) 1/2 3/4 3/4 11727 15/16 NOTES (1) Tangent Roint Method (2) Circle Template (3) Starrett No. 167 Radius Cases Range 1/32 to 1/2 Inch Radii OR e
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