ML20210E740
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o UNITED STATES 3 ', 3 y, ( /[,i NUCLEAR REGULATORY COMMISSION E
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o 1450 MARIA LANE, SUITE 210 -
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WALNUT CRE EK. CALIFORNIA 945%
MA'/ 21584 MEMORANDUM FOR:
D. Kirsch, Chief, Reactor Projects Branch k FROM:
B. Wagner, Reactor Inspector THRU:
H. Canter, Chief, Engineering Section
SUBJECT:
TUBE STEEL RADII MEASUREMENTS re:
DCAF Allegations 92/93 Between May 14 and May 17, 1984 I performed an inspection on the licensee's methods of tube steel radii measurement. 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 3x2x1/4 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 gage 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. Cancer DCAF 92/93 O
8603290139 060123 PDR FDIA DEVINEB4-744 PDR
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TURE STEEL MEASUREMENTS ITEM
- c'en namne R = 2t LOC UNIT DESCRIPTION PART NO.
SIZE NO.
TPM 'l TEMPIATE I
I2l CACF_ L J I RRADrfR Aux 2
Pipe Hanger 47-125R 3x3x1/4 (a) 11/32 1 1/2 1/2 Bids 15/32 3x3xt/4 (b) 14/32 1 1/2 12/32 Aux 2
Hanger 413-142 SL 6x6x3/8 (a) 30/32 3/4 Bldg (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 3 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 4x4x1/4 (a) 17/32
> 1/2 1/2 Bldg 15/32 3x3x1/4 (b) 1/2 1 1/2 1/2 15/32 9
l TURE STEEL MEASUREMENTS (continued)
ITEM
__.wramnnen nan"TR R = 2t I,0C UNIT DESCRIPTION PART NO.
SIZE NO.
TPM '#
TEMPLATE"#
GAGE REQtfrS I
l##
Aux 2
Pullman Materials P.O. No.
3x3x1/4 (a) 12/32 1/2 1/2 1'/2 Bldg
_ Storage 14817 14/32 j
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 Cages Range 1/32 to 1/2 Inch Radii l
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Table of Contents Subject of Paragraph Respo'nsibility 1.
Persons Contacted Followup on Item of Noncompliance (83-37-01)
Ivey/Myers e6-[
Tube Steel Radius (Allegations 92, 93, 341)9(*-
Wagner.dh--
944.
RHR Low Flow Alarm (Allegation 45)
Morrill pF 5 ;- - A-325 Bolt Replacement (Allegations 106, 131)
Morrill a
6.
Personnel Exit Interview Form (Allegation 333)
Clark 7.
Training to Disregard Codes and Standards Cl a r k <&=--
(Allegation 332) 8.
Unmarked Tools (Allegation 278)
Canter /Myers
)t 9.
Hold Tag Removal (Allegation 279)
Myers ad== -'
W 10.
Examination of OVIDs and P& ids (Allegations 34, 61, Morrill/Qualls 61a, 102, 334, 335, 336)( M 'h 2 M ll. Foley Records Turnover (Allegations 65, 167)
Myers
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12.
Hydrostatic Tests (Allegations 228-232)
Ivey/Crowley <f---
13.
Stainless Steel Purchases- (Allegation 275)
Burdoin ggy
([Cl Use of High Carbon Stainless Steel (Allegation 276)
BurdoinaGay--
15.
Maximum vs. Minimum Carbon Content (Allegation 277)
Burdoin 16.
Bolting (Allegations 351, 861, 862, 864, 871, 873, 885) Canter Clark
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17.
Preinspection Engineer Organizational Freedom (Allegation 331).
18.
Temporary-Leadman (Allegation 280)
Myers agh--
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19.
AWS Inspector Qualifications (Allegation 343)
Myers 0
Ghost Welding (Allegation 398)
Mye rs -c--
if Systems Interaction Program (Allegations 9, 13, 36, 48)Crowley 22.
Exit Interview t
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,wa, u-,urs w/nnrw y.f$.n 9
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