ML19338C656
| ML19338C656 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 07/17/1980 |
| From: | Economos N, Herdt A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML19338C649 | List: |
| References | |
| 50-269-80-25, 50-270-80-22, 50-287-80-19, IEB-79-13, NUDOCS 8008180358 | |
| Download: ML19338C656 (5) | |
See also: IR 05000269/1980025
Text
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION
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REGION 11
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101 MARIETTA ST., N.W., EUITE 3100
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ATLA _NTA, GEORGIA 30303
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'JUL 211990
Report Nos. 50-269/80-25, 50-270/80-22 and 50-287/80-19
Licensee: Duke Power Company
422 South Church Street
Charlotte, NC 28242
Facility Name: Oconee Nuclear Station
Docket Nos. 50-269, 50-270 and 50-287
License Nos. DPR-38, DPR-47 and DPR-55
Inspection at Oconee near S
ca, South Carolina
Inspector:
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N. Econ
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Date Signed
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Approved by:
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A. R. lierdt, Section Chief, RCES Branch
Date Signed
SUT!ARY
Inspection on June 23 and 26, 1980
Areas Inspected
This routine, announced inspection involved 10.5 inspector-hours at DPC's Corporate
Offices, Charlotte, NC and on site in the areas of IE Bulletin 79-13 (Unit 2); once
through steam genenator (OTSG) manway stud failure (Unit 3).
Results
Of the 2 areas inspected, no items of noncompliance or deviations were identified.
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800818o358
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DETAILS
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1.
Persons Contacted
Licensee Employees
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- J. M. Davis, Superintendent of Maintenance
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- J. N. Pope, Superintendent of Operations
- R. J. Brackett, Sanior Quality Assurance Engineer
K. R. Wilson, Assistant Engineer Licensing
- C. B. Creezen, Inservice Inspection Engineer
Other Organizations
Babcock & Wilcox Construction Company (B&W)
H. W. Stoppelman, Level II UI Examiner
NRC Resident Inspector
Francis Jape
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- Attended exit interview
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2.
Exit Interview
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The inspection scope and findings were summarized on June 23 and 26,1980
with those persons indicated in paragraph I above. The inspector identified
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the areas inspected which included review of IE Bulletin 79-13 radiographs
and inspection / observation of once through steam generator manway studs in
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Unit 3.
The licensee agreed to ultrasonically examine the corresponding
studs in Unit I during the upcoming shutdown.
3.
Licensee Action on Previous Inspection Findings
Not inspected.
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4.
Unresolved Items
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Unresolved items were not identified during this inspection.
5.
IE Bulletin 79-13 Cracking in Feedwater System Piping (Unit 2)
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This work effort was a followup to the ongoing review of radiographs taken
to verify the integrity of certain auxiliary feedwater pipe welds. This
matter was discussed in RII Report Nos. 50-269/80-01, 50-269/80-03 and
50-270/80-10.
The below listed radiographs were reviewed to determine
whether they met applicable code, ASME Section III (77S78) NC-5000 and to
the 2T sensitivity level.
The radiographic procedure was identified as
NDE-10A Rev. 4.
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Once Through Steam Generator (OTSG) #2A
Riser #
Interval
Comments
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Flange to Elbow
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0-1, 3-0
Lack of Fusion indications.
II examiners for this condi-
tion.
Pipe to Pipe
1
Acceptable
Flange to Elbow
2
Acceptable
Pipe to Pipe
2
Acceptable
Flange to Elbow
3
Acceptable
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Pipe to Pipe
3
Acceptable
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Flange to Elbow
5
0-1
Lack of penetration, cold
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lap, porosity, slag, tungsten,
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indications. Rejected by
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for these conditions.
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Pipe to Pipe
5
Acceptable
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Flange to Elbow
6
0-1, 4-0
Lack of fusion slag and
tungsten indications.
Re-
II examiners for these
conditions.
Pipe to Pipe
6
Acceptable
Flange to Elbow
7
3-0
Slag, porosity, tungsten,
indications. Rejected by
iners for these conditions.
Once Through Steam Generator #2B
Riser #
Interval
Comments
Flange to Elbow
1
Acceptable
Pipe to Pipe
1
Acceptable
Flange to Elbow
2
Acceptable
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Once._Through Steam Generator //2B
(Continued)
Riser (/
Interval
Comments
Pipe to Pipe
2
Acceptable
Flange to Elbow
3
Acceptable
Pipe to Pipe
3
Acceptable
Flange to Elbow
5
Acceptable
Pipe to Pipe
5
Acceptable
Flange to Elbow
6
2-3, 3-0
Lack of penetration, porosity,
tungsten indications.
Re-
examaners for these conditions.
Pipe to Pipe
6
Acceptable
Flange to Elbow
7
Acceptable
Pipe to Pipe
7
00-1, 1-2
Lack of fusion, lack
3-4, 4-0
of penetration porosity
indications. Rejected by
for three conditions.
The indications in the desigruted radiographic intervals of the welds listed
above were interpreted by the inspector as code rejectable fabrication type
indications.
These interpretat ions are basically in agreement with those
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documented on the licenser's radiographic reader sheets
The inspector
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did not agree with the interpretation offered by the licensee's consultant
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who rejected the presence of these defects e.g., lack of fusion and/or lack
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of penetration with the statement that " Rejectable levels of weld defects
are also not apparent"
The licensee representatives stated that a final
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copy of the consultants report on these welds would be f orthcorpg. Within
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the areas inspected no items of noncompliance or deviations were Ident ified.
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6.
Manway Stud Failure (Unit 3)
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On June 26, 1980 the inspector arrived at this site to observe / inspect
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certain manway studs found to contain cracks during the removal and/or
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reassembly of the lower manway cover plate (MCP) on OTSA "A".
Removal of
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the MCP was in connection with the repair of a leaky OTSG tube. Discussions
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with the licensee representative disclosed that in the lower MCP cf OTSG "A",
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eight (8) out of a total of sixteen studs were found with cracks while in
the OTSG "B" one cracked stud was found in the upper MCP.
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In OTSG "A" four (4) of the cracked studs were found through visual inspec-
tion and four (4) by ultrasonics examination. Presently all the studs in
OTSG "A" have been replaced with new studs on hand. These replacement
studs were found to be sound by ultrasonics examination. In OTSG "B",
all
the studs in the upper MCP were replaced with new studs as in OTSG "A" and
those in the lower MCP were ultrasonically tested in place. This examination
was observed by the inspector.
In addition the inspector observed the
examination of four new studs, identified as follows:
S/II 1006114-001, fit #137400 2 each
S/H 104289-001, lit. #116316 2 each
The new studs were manufactured in accordance with ASME specification
SA-320-L43 f rom AISI-4340 material produced f rom Hts. #137400 and 116316.
Chemical and mechanical properties were found to be consistent with speci-
fication requirements. The studs were manufactured by Erwin Industries and
supplied to the licensee by B&W. The inspector visually examined certain
studs which exhibited cracks indicationa and noted that in each case the
failure was associated with the root of thread.
Discoloration, adverse
surface conditions, contamination and lack of adequate facilities inside
containment precluded further examination of those components.
The inspector requested that DPC provide to the NRC two of the cracked
studs for an independent metallurgical investigation / failure analysis.
Within the areas inspected no items of noncompliance or deviations were
identified.
7.
Inspection 'of MCP Studs (Unit 1)
The licensee has agreed with a RII request that Unit 1 MCP studs be checked
at the first opportunity.
Subsequent to the closing of this inspection,
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the licensee's representative telephoned RII that results of an ultrasonic
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examination on the upper and lower MCP studs while in place showed that all
of them were clear of crack indications.
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