ML20086C384
| ML20086C384 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 07/29/1975 |
| From: | Eckert R Public Service Enterprise Group |
| To: | Knuth D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8311230236 | |
| Download: ML20086C384 (4) | |
Text
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m Ric.hrrd M. Eckert Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 201/622-7000 Vice President Engineering and Construction July 29, 1975 Dr. Donald F. Knuth, Director U.
S. Nuclear Regulatory Commission Office of Inspection and Enforcement 7920 Norfolk Avenue Bethesda, Maryland 20014
Dear Dr. Knuth:
LINEAR INDICATIONS IN A-106 GRADE B SEAMLESS CARBON STEEL PIPE COMPONENT COO LING SYSTEMS NO. 1 UNIT SALEM NUCLEAR GENERATING STATION 1
On December 23, 1974 the Manager of Quality Assurance reported verbally that the linear indication previously identified in component cooling spool 1-CC-95 was not a crack and that it was aL_ lap M h_e pipe material.p_rgduced-4uring the manuf4c h ing proceqq.
The indication wa~s in no way rela ted to the spool piece fabricating process and appeared to be an isolated occurrence.
The item was therefore not classified as reportable under 10 CFR 50.55(e).
Subsequent to that finding,'a continuing investi-gation was carried out by the PSE&G Engineering Department to determine if other pieces of pipe manufactured from the same heat and of the same size contained a similar characteristic.
The results of the continuing investigation are as follows and are considered reportable under 10 CFR 50.55(e).
Introduction On December 6,1974 component cooling spool 1-CC-95 was inspected and rejected for visual indications on the external surface of the piping.
A one-foot long section containing indications was removed by the Mechanical Site' Engineer and forwarded to PSE&G.
Energy Laboratory for their. evaluation.
The Energy Laboratory i
reported that the indication was a lap extending in the longitudinal direction for the entire length of the submitted section.
The lap was a result of manufacturing processing of the piping during hot working operations.
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Dr.
D. F. Knuth 7-29-75 Inspection of Pining In order to evaluate the significance of the defect, inspection of accessible component cooling piping with the same material, diameter and schedule (ASTM A-106 Grade B, 4" Schedule 40) was conducted by the PSE&G Engineering and Construction Departments.
The inspection consisted of visually examining the external surface of selected straight sections and bends of piping spools and reporting any indications found.
Where an indica-tion was found similar to the original indication, the area in question was marked, then blended with an 80 grit emery paper.
If the indication still was present, the area was marked and the entire spool was subjected to an ultrasonic inspection.
Results of Piping Inspection (A)
Visual Inspection Visual inspection using the above procedure found the original defect in pipe spool 1-CC-95 continuing into the remainder of the spool and defects in a new pipe spool 1-CC-93.
Ultrasonic inspection of these spools, conducted by the Energy Laboratory, revealed a series of longitudinal defects of various lengths on the outer surface of the piping.
Pipe spool 1-CC-95 had defects extending into the pipe wall from 0.040" to 0.070" while 1-CC-93 had indication from 0.020" to 0.070" deep.
The defects in both spools (1-CC-93 and 95) were beyond acceptance limits for surface defects within the applicable specification (ASTM A-106 Grade B).
After r'eviewing the data, the Engineering
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and Construction Departments recommended removal of both spools (1-CC-93 and 95) from the piping system.
The two replacement spools were examined both visually and ultrasonically before installation and found to be defect free.
The balance of spool pieces manufactured from 'the same heat and size run in both component cooling and auxiliary-feed. systems are being visually inspected by the PSE&G Engineering Department.
Although still in progress, this examination has not found any additional indications in any other pipe spools.
l (B)
Metallurgical Inspection The two rejected pipe spools were_ purchased'for Public Service Electric and Gas Company by the M. W. Kellogg Company on their Purchase Order No. 17-01-00-72-1 from the United-States Steel-Company, Lorain Works.
Both pipe spools were manufactured from the same heat'(U.S.S. Heat No. N 30895) to specification ASTM A-106 Grade B.
Copies of the certified mill test reports were examined; the material conforms to the ordering specification.
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D. F. Knuth 7-29-75 I
i Microscopic examinations were conducted on specimens cut from pipe spools 1-cc-93 and 1-cc-95.
Photomicrographs of cross sectional areas were taken to illustrate the extent of the defects.
Metallurgical examination revealed that the defects were longitudinal surface laps extending into the piping in a spiral pattern.
Summary The cold lap defects discovered were confined to one heat (U.S.S. N 30895).
Piping in the auxiliary feed and component cooling systems with the same material, diameter and pipe schedule is being examined visually.
To date, the result of that examination revealed one other pipe spool, 1-Cc-93, with the same type defect.
No rejectable defects were found in any of the other inspected pipe spools.
The two pipe spools, 1-cc-93 and 1-cc-95, were removed from the piping system and replaced.
Tia replacement piping was examined both visually and ultrasonically and found to meet the applicable. specification.
The remainde r of component cooling and auxiliary feed piping fabricated from material of heat (U.S.S. Heat No. N 30895) will be examined to assure that this material meets specified requirements.
The results of this ongoing examination will be available for your -
future examination at the Salem Nuclear Generating Station.
If you.
require additional information, we will be pleased to' give further details.
Very truly yours, 4 y(
cc Mr.
J.
P. O'Reilly King of Prussia, Pa.
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