IR 05000263/1998006

Insp Rept 50-263/98-06 on 980323-0423.No Violations Noted. Major Areas Inspected:Maint

ML20247K221
Person / Time
Site:	Monticello
Issue date:	05/11/1998
From:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
Shared Package
ML20247K219	List: IR 05000263/1998006 ML20247K213
References
50-263-98-06, 50-263-98-6, NUDOCS 9805220043
Download: ML20247K221 (8)

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U.S. NUCLEAR REGULATORY COMMISSION REGION lil Docket No.: 50-263 License No.: DPR-22 Report No.: 50-263/98006 l

l Licensee: Northern States Power Company l

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l Facility: Monticello Nuclear Generating Station Location: 414 Nicollet Mall Minneapolis, MN 55401 l

Dates: March 23 - April 23,1998 Inspector: D. Jones, Reactor inspector Approved by: J. A. Gavula, Chief Engineering Specialists Branch 1 Division of Reactor Safety I

9905220043 990511 gDR ADOCK 05000263

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EXECUTIVE SUMMARY Monticello Nuclear Generating Station, Unit 1 NRC Inspection Report 50-263/98006 This inspection included a review of the implementation of the inservice inspection program for the 1998 Monticello refueling outage 18. The report covers on-site inspection by one regional inspecto Maintenance

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Engineering involvement in the oversight of inservice inspection activities and jet pump hold down beam replacement was excellent. (Section M1.1)

. Overall, the inservice inspection activities were conducted in accordance with appropriate procedures and the overall inservice inspection program appeared technically sound and effective. (M1.2)

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Nondestructive examinations were performed in accordance with applicable procedures by qualified personnel. (Section M5)

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Corrective action to revise the inservice inspection plan to include the inspection of all reactor shell welds was implemented and effective. (Section M8)

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Report Details M1 Conduct of Maintenance M1.1 Inservice insoection (ISI) Insoection Scoce (73753. 73755)

Inspectors observed ISI examinations and reviewed ISI examination data packages to assure appropriate examination was performed and data was recorded as required by the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Cod b. Observations and Findings The inspector observed work, radiation protection practices, reviewed ISI procedures, personnel certifications and reviewed data associated with the following activities:

• Ultrasonic (UT) inspection of jet pump hold down beams (JPHDB) (beams 11-20)

e U T calibration and testing on residual heat removal suction piping (weld 4, 1S0-1S1-97003-B)

• UT of core spray piping e UT calibration and inspection of jet pump number 16, mixer (MX) section welds MX2 and MX4 e Visual examination of steam dryer support bracket 215 Vendor personnel performed ISI to the ASME Code,Section XI,1989 Edition. Licensee activities observed were performed in accordance with applicable ASME Code requirement All applicable ISI procedures were approved by the Authorized Nuclear Inservice inspector (ANil) and were reviewed by the NRC inspector. The ISI procedures were found to be acceptable and in accordance with ASME Code,Section V,1989 Editio l During examinations of all 20 JPHDBs using UT, an indication was found on beam No.10. Good safety focus was demonstrated in meetings held to discuss the detected crack. The beam was subsequently replace I i

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i Good contractor oversight was noted during the preparation for the UT of a jet pump riser while the fixture for the lower core spray UT was being removed. Both operations created confusion on the communications headsets. The cognizant engineer i immediately recognized the communications problem and took prompt action to suspend one operation until the other was completed to reduce the amount of confusion on the headset Conclusions The examination data was found to be in accordance with the applicable ISI procedures and ASME Code requirements. The inspector concluded that engineering involvement in the oversight of ISI activities and JPHDB replacement was e'x cellen M1.2 Proaram and Procedure Review Insoection Scooe (73051: 73052)

The inspector reviewed and evaluated the licensee's third ten-year interval ISI program plan for compliance with technical specifications, ASME Code and NRC requirement Additionally, the inspector reviewed ISI procedures used during the refueling outag Observations and Findinas The ISI program was conducted in accordance with ASME Section XI,1989 Edition. All ISI procedures reviewed were found to be in accordance with ASME Code,Section V and XI,1989 Edition requirement Conclusions

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The inspectors verified that ISI activities were being conducted in accordance with the appropriate procedures and ISI program. The overall ISI program appeared technically sound and effectiv M5 Maintenance Staff Training and Qualification M5.1 ISI Personnel Qualifications Insoection Scoce (73753)

The inspector reviewed ISI personnel qualifications of licensee and contract personnel performing the ISI activities observed in Section M !

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, Observations and Findings Qualification of personnel performing NDE work was verified. NDE personnel were knowledgeable of procedural requirements and proficient in the performance of ND Personnel performing NDE were found to have proper qualifications which had been reviewed and accepted by the licensee staff and the ANi Conclusions NDE was performed in accordance with applicable procedures by qualified NDE personne M8 Miscellaneous Maintenance issues M8.1 (Closed) Deviation (DEV) 50-263/96006-01: Failure to include the applicable Edition and Addenda of the ASME Code in ISI plan.

I Augmented examination of the reactor vessel required by 10 CFR 50.55a(g)(6)(ii)(A)(2)

specifies ASME Section XI,1989 Edition Table IWB-2500 (Category B-A) which requires the inspection of all reactor shell welds. However, the licensee included in the third ten-year ISI interval the 1986 edition requirements of Table IWB-2500-1 which required inspection of only one reactor vessel shell weld. The licensee's corrective action was to revise the inspection plan to schedule the inspection of all reactor shell weld V. Management Meetings

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Xi Exit Meeting Summary On April 23,1998, the inspector presented the inspection results to members of licensee management. The licensee acknowledged the findings presented.

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The inspector asked the licensee whether any materials examined during the inspection should be considered proprietary. No proprietary information was identifie _ _ - -

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PARTIAL LIST OF PERSONS CONTACTED Licensee D. Carstons, Senior Production Engineer l T. Crippes, Senior Production Engineer l

R. Deopere, ISI Field Supervisor L. Dillon, Authorized Nuclear Inservice inspector of Hartford Stc' ' 1 Boiler inspection and insurance Company M. Hammer, Plant Manager J. Ricker, Superintendent Materials and Special Processes C. Schibonski, General Superintendent Engineering M. Wadly, Vice President Nuclear INSPECTION PROCEDURES USED IP 73051: Inservice inspection - Review of Program IP 73052: Inservice Inspection - Review of Procedures IP 73753: Inservice Inspection IP 73755: Inservice Inspection - Data Review and Evaluation ITEMS OPENED, CLOSED, AND DISCUSSED Closed 50-263/96006-01 DEV Failure to include ASME Code Edition and Addenda in ISI plan

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LIST OF DOCUMENTS REVIEWED 1998 Reactor Vessel Internals Examination, Ultrasonic Examination Final Report For Monticello Nuclear Generating Plant Monticello ISI 1998 Outage Report, Class 1/2 Exams,3rd 10 year Monticello Nuclear Generating Station Spring 1998 in Vessel Visual Inspection Preliminary Report Procedure Revision Title ISI-UT-16 12 UT Exam of Welds in Austenitic and High Nickel Alloy Materials l

ISI-UT-17 4 Ultrasonic Sizing of Planar Flaws ISI-LTS-1 0 Limitations to NDE ISI-MT-1 9 Dry Powder Magnetic Particle Examination ISI-MT-2 9 Wet Magnetic Particle Examination ,

ISI-PT-1 11 Solvent Removable Visible Dye Liquid Penetrant Examination ISI-UT-1 12 UT Exam of Ferritic Steel Pipe and Fitting Welds ISI-UT-3A 7 UT Exam of Reactor Vessel Welds ISI-UT-5 5 UT Exam of Monticello Reactor Vessel Nozzle Forging inner Radii 8316 0 Remote UT Exam of Jet Pump Hold Down Beams 8313 0 Remote UT Exam of BWR Reactor Vessel Internal Core Spray Piping Welds 8314 0 Remote UT Exam of BWR Reactor Vessel Jet Pump Riser Piping Welds 8315 0 Remote UT Exam of BWR Reactor Vessel Internal Jet Pump Diffuser and Mixer Welds 8035 0 Jet Pump Beam Bolt Assembly and Jet Pump Inlet Mixer Removal and Replacement Procedure 8034 0 Jet Pump Hold-Down Beam Keeper Tack Welding Procedure

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LIST OF ACRONYMS USED ANil Authorized Nuclear Inservice inspector ASME American Society of Mechanical Engineers CFR Code of Federal Regulations DEV Deviation DRS Division of Reactor Safety l ISI Inservice inspection i JPHDB Jet Pump Hold Down Beam

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MT Magnetic Particle MX Mixer NDE Nondestructive Evaluation NRC Nuclear Regulatory Commission PT Liquid Penetrant UT Ultrasonic Test

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