IR 05000263/1975016
| ML20024G552 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 10/30/1975 |
| From: | Erb C, Ledoux J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML20024G547 | List: |
| References | |
| 50-263-75-16, IEB-75-10, NUDOCS 9102120648 | |
| Download: ML20024G552 (7) | |
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U. S. NUCLEAR RECULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEFINT
REGION III
s Report of Construction Inspection IE Inspection Report No. 050-263/75-16 Licensee: Northern States Power Company 414 Nicollet Mall Minneapolis, Minnesota 55401 Monticello Nuclear Generating Plant License No. DPR-22 Monticello, Minnesota Category:
C Type of Licensee:
Type of Inspection:
In service and special, announced Dates of Inspection:
September 29-30 and October 16-17, 1975 oh fE
~ wA Principal Inspector:
I,+C.M. Erb
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Accompanying Inspectors: None w
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.. n, Other Accompanying Personnel: None k hC h=Nmf l
/ 6.3 0 / 73
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l Reviewed By:
J. C. LeDoux h"SeniorInspector (Dat e) /
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Construction and Engineering Support Branch
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kD 21kDOCK05000263 O648 751031 F
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SUMMARY OF FINDINGS Inspection Summant
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Inspection of September 29 and 30 (75-16): Review of quality documenta-tion and replacement piping to be installed in both four-inch recirculation bypass lines. Reviewed procedures and records for the in-service in-rpection program performed by Nuclear Services Company (NSC).
Reviewed quality documentation for two-inch drain line installation. No items of noncompliance.
Inspection of October 16 and 17:
Review of repair plan for the feedwater sparge units and nozzle area.
Review of design changes made in the replacement sparger assemblies and thermal sleeves.
Entrance into the vessel to inspect the repair areas around the nozzles.
Enforcement Items None.
Licensee Action on Previously Identified Enforcement Items
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Not applicabic.
Other Significant Items _
A.
Systems and Components 1.
The licensee found cracks in the.feedwater apareer during underwater.
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inspection. Upon dropping the vessel water icvel and af ter re-
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moving the spargers, cracks were found in the feedwater nozzle cladding.
2.
The in-service inspection has included ultrasonic testing of over 40 welds, with no indications of a serious nature. No radi-ographic evaluation was necessary during this in-service inspection.
3.
Certain welds in the removed four-inch bypass lines will be i
sectioned and examined metallurgically to determine if any serious defects have been initiated since tne last UT inspection.
B.
Facility Items None.
C.
Managerial Items l
None.
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D.
Noncompliance Identified and Corrected by Licensee Not applicable.
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E.
Deviations
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None.
F.
Status of Previously Reported Unresolved Items Not applicable.
Management Interview A.
The following persons attended the management interview at the close of the inspections:
Northern States Power Company (NSP)
C. E. Larson, Plant Manager M. Clarity Superintendent - Engineering and Radiation C. H. Harmsen, Supervising Engineer - Plant Engineering and
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Construction Department P. Krumpos, Operations Quality Assurance Engineer B.
Matters discussed and comments on the part of management personnel, were as follows:
1,%Tge 4ach Bypast Replacement Pipina - Bul1=+'- RO 75-10 and %
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75-10A The inspector stated that he had examined the quality docu-mentation and completed piping welds and found them to meet the requirements of B31.1.0.
He said he understood that the licensee would section and metallurgically examine two welds from the piping which have been removed from the bypass lines. A nonde-l structive test has been performed to the requirements of ASME Section V, Summer Addendum, t
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2.
In-service Inspection Overall Status The inspecto'r noted that he had received a summary of in-service pipe weld inspections to date. The present in-cervice inspection is the fourth one to be performed since commercial startup. Cer-I tain dissimilar welds have been inspected the second time. Dosimeters were removed af ter lh years of operation, and the surveillance im-I
pact test specimens will be removed for a test seven i-:rs from-3-i
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the date of commercial operation.
3.
Replacement Drain Line The inspector stated'that he had examined the quality docu-mentation for the two-inch drain line and found it to meet B31.1.0.
The welds were socket type and were visually checked and penetrant tested. The inspector did not examine the hard-ware because of control rod drive operations in the area.
Repair of Sparge Units and Removal of Cracks in Nozzle Areas The inspector stated that approval of the authorized' inspector would be required for any repairs to the nozzles. A stress reanalysis would be required wherever grinding intruded into the pressure boundary base metal.
Such reanalysis should be approved by the licenace and his consultant.
See attached Inquiry Report.
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REPORT DETAILS Persons Contacted in addition to the staff members present at the management interview, the following individuals were contacted during the inspection:
Northern States Power Company (NSP)
- D. E. Gilberts, General Manager - Power Production
- J. G. Bollenson, Project Superintendent
- R.1. Nelsen, Quality Control Engineer - Level III, RT
- P. Pochop, Quality Control Engineer Cherne Company (Cherne)
- F. Mutter, Project Manager
- R. Richter, Supervisor - Quality Control
- R. Wagner, Production Foreman
- aR. Johnson, General Foreman Nucicar Service Corporation (NSC)
- D.
McGill, Nondestructive Testing - Level. Ill, UT Hartford Steamboiler Insurance Company (Hartford)-
- C. Tahnk lnspector
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General Electric Company (CE)
- D. Rybarik, Project Manager
- P. McGuire, Senior Engineer
- 0ctober 16, 1975
- September 30, 1975
- September 29, 1975
- 0ctober 17, 1975 Results of Inspection 1.
Replacement of Four-inch Bypass Lines These two piping loops are being replaced by Type 304-L stainless steel pipe and fittings, except for the veldolets at each end of the loops and the shut off valve in each loop. Cherne has contracted to fabricate and install the piping, with Peabody Testing (Peabody)
the source for NDE. The inspector examined the following documentation-5-
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and found the materials, fabrication procedures, and NDE results
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to meet Code requirements.
a.
Procedure No. 3.23.A.1
- Penetrant Test b.
Material Certifications - Penetrant, Batches 5A018, SA041, 5A065 c.
Procedure No. 3.20.A.2
- Radiography d.
Heat JBTH
- Six 90 ells, Mideo e.
Heat JBDG
- Two T fittings, Mideo f.
Heat SE14A
- Coated electrode, Arcos Company g.
Heat E4786
- Bare electrode, Weldwire Company h.
Heat 482038
- Pipe, Sandvik 1.
Heat 00658
- Pipe, Allegheny Ludlum 2.
Summary of In-service Pipe Weld Inspection by Ultrasonics Carbo $~
i Total Welds Stainless lSteelWelds ldentifi-Dissimilar Welds i Examined System cation Welds Core Spray TW7
"A" Loop
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19 TWil
"B" Loop
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17 RER TW20 LPCI
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22 TW30 LPCI
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TW36 Reactor
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Head Spray REW10 Shutdown y
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43 Reactor Cleanup
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f Identifi-Dissimilari S t ainic s s
Carbon Total Welds Systems cation Welds
Welds Steel Welds Examined Reactor Re-circulation
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12" Riser I
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- tanifold l
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Recire. "A" i
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Bypass "A"
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liypass "B"
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"A" Loop
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"B" Loop i
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PS3
"C" Loop
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"D" Loop
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Feedwater FW2A & 2B
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l 164 356 553 Totals j
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Summarv ofP1,r-and Status of Work for Repair of Feedwater Nozeic (
Areas and pl.acement or reedwater Sparters l
See attachment to this report.
Attachment:
IE Inquiry Report No. 050-263/75-01Q l
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