ML20084Q538
| ML20084Q538 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 04/13/1984 |
| From: | William Jones OMAHA PUBLIC POWER DISTRICT |
| To: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| IEB-83-06, IEB-83-6, LIC-84-045, LIC-84-45, NUDOCS 8405210335 | |
| Download: ML20084Q538 (6) | |
Text
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Omaha Public Power District 1623 Harney Omaha. Nebraska 68102 1
402/536-4000 April 13, 1984 LIC-84-045 l
l Mr.
J.
T.
Collins
-n Regional Administrator l,q U.
S.
Nuclear Reaulatory Commission J-Region IV I
611 Ryan Plaza Drive, Sui te 1000 L
APR l 6 BB4
}p Arlington, Texas 76011 q
Reference:
Docket No. 50-285
Dear Mr. Collins:
IE Bulletin 83-06 Non-Conforming Materials Supplied by the Tube-Line Corporation In a letter dated December 16, 1983, the Omaha Public Power Dis-trict responded to the subject bulletin.
In that response, the District stated its plans to demonstrate that the four (4) four-inch by three-inch concentric reducers furnished by the Tube-Line Corporation are suitable for their intended service.
The District provided the following justification for continued operation until replacement (if necessary) of these reducers is undertaken:
(1)
The reducers in question were installed as a part of a modi-fication completed in November, 1981.
The system has been in operation over two years with no problems.
(2)
" Normal" operating conditions for the systeu would subject the reducers to a pressure of approximately 51 psig.
(3)
Under the abnormal condition of the raw water pumps pumping
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against a closed header, these Schedule 40 reducers would be subjected to a pressure of only 90 psig.
(4)
After installation, the system was hydrotested at 190 psig with no leakage.
The procedure under which these reducers were installed originally called for hydrotesting at 190 psig.
However, contrary to state-ment (4), during installation it became apparent that a 190 psig hydrotest was not possible.
Instead, a procedure change was ini-tiated and approved by the Plant Review Committee which replaced i
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b, Mr. J. T.
Collins LIC-84-045 Page Two the 190 psig hydrotest with a radiographic examination of the welds.
One of the four reducers (the one associated with valve RW-216) was able to be removed and hydrotested, but the remaining three were not.
The discrepancy regarding the 190 psig hydrotest was discovered during a subsequent review.
The District believes that adequate testing measures were taken after installation; the previous sub-mittal simply did not accurately reflect these measures.
There-fore, item (4) of the December 16, 1983 letter should read as fol-lows:
(4)
After installation, the reducer associated ilth valve RW-216 was hydrotested to 190 psig.
The welds associated with the remaining three reducers were radiographed.
The system was returned to service and observed for leakage.
In addition, the District has completed its program for demon-strating that the reducers are suitable for their intended ser-vice.
This program was discussed in the December 16, 1983 letter and consisted of performing a Brinell hardness test and a chemical composition analysis on the four reducers.
The results of these tests are attached (Attachments 1, 2, and 3). contains a compilation of the estimated cost and man-hours to implement this bulletin.
Sincerely, l'
YU -
W.
C Jones Divis on Manager Production Operations WCJ/DJM:jmm cc:
U. S.
Nuclear Regulatory Commission Document Control Desk Washington, D.C.
20555 LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire Avenue, N.W.
Washington, D.C.
20036 Mr.
E. G. Tourigny, Project Manager Mr. L.
A. Yandell, Senior Resident Inspector a
b.
The District has concluded its qualification program of Tube-Line Corporation fittings at the Fort Calhoun Station.
These fittings consist of four (4) four-inch by three-inch concentric reducers on the raw water drain lines from the four (4) component cooling heat exchangers.
P Testing consisted of Brinell hardness readings for correlation with ultimate tensile strength and sample filings for analysis of proper chemical composition.
Acceptance criteria used were from ASME Boiler and Pressure Vessel Code,Section II, Material Speci-fications for SA-106, Grade B, carbon steel pipe, for chemical com-position and minimum ultimate strength and SA-234, carbon steel pipe fittings, for maximum Brinell hardness.
Criteria for testing and results can be found on Attachment 2
[
(BHN) and Attachment 3 (chemical composition).
Based on the re-i sults of the testing, the District will keep the four (4) reducers in service and sees no reason for them to be replaced.
For Brinell hardness, three (3) impressions were made on each re-ducer.
With the dimensions of each impression, three (3) hard-nesses were calculated and the arithmetic mean of the three (3) hardnesses served as the Brinell hardness for that particular re-ducer.
SA-234 specifies a maximum BHN of 197 for this material and SA-106 specifies a minimum ultimate tensile strength of 60,000 psi which, according to ASTM A-370-77, correlates with a BHN of 123.
Of the four (4) reducers, only one (1) (near drain valve l
RW-215) had an average BHN which did not fall within the 197-123 BHN range.
This reducer had an average BHN of 204.
Maximum hardness is specified so as to preclude a material which is too brittle.
Brittleness implies that a material's tensile i
strength is not much more than its yield strength.
In the case at hand, the reducer's yield strength, as required by SA-106, Grade B,
is 35,000 psi.
The concern that the one (1) fitting is too brittle should be dismissed based on the negligible loading and the expected yield strength.
The initial concern as to whether the fittings are strong enough is more than adequately addressed by the favorable results of the hardness testing.
All four (4) reducers fall well within the material specification for chemical composition of SA-106, Grade B, carbon steel piping.
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ATTACHMENT E Reducer Near Drain Valve Tag No.:
BHN:
Average BHN:
213 151 150 157 143 214 193 181 174 176 215 194 204 206 t
211 216 153 156 151 163 ACCEPTANCE CRITERION:
123 < BHN < 19'i 1
6 i
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ANALYTICAL CHEM 13TLY LACIRATCRY, INC, 0345 BLONDO ST.
G.MAHA. NEBRASKA 64134 (402) 397 7734 February 13, 1984 Method: ASTM.
Report No. 020-13-024 Report For:
OPPD Jones Street Station 4th & Marcy Street Omaha, Nebraska 68102 Attn: Rich Heidel Report On:
Analyses on 4 Steel Samples received
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February 8, 1984.
84'Wh4kte? Y Test Results: Test
- 213
- 214
- 215
- 216 Carbon, C B.Jo;eek 0.26 %
0.29 %
0.25 %
0.27 %
Manganese, Mn 0.J7./.o4 0.80 %
0.76 %
0.91 %
0.89 %
Sulfur, S o.of?lA M 0.027 %
0.031 %
'0.029 %
0.026 %
Phosphorus, P d.641, W A0.015 %
0.011 %
0.027 %
0.030 %
Silicon, Si D./d,<wis0.22%
0.24 %
0.20 %
0.29 %
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As requested in the bulletin, the following is a compilation of the cost and estimated manhours expended for this resolution:
Research and Evaluation:
Engineer 157.7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> Approximately $2,300 Supervisor 37 hours4.282407e-4 days <br />0.0103 hours <br />6.117725e-5 weeks <br />1.40785e-5 months <br /> Approximately $740 Material Testing:
Engineer 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> Approximately $290 Fitters 40 hours4.62963e-4 days <br />0.0111 hours <br />6.613757e-5 weeks <br />1.522e-5 months <br /> Approximately $480 QC 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> Approximately $60 Lab Fees:
$259.20 Approximate Totals:
258.7 manhours Approximately $4,129.20
,