IR 05000263/1997011

Insp Rept 50-263/97-11 on 970707-10.No Violations Noted. Major Areas Inspected:Installation of Emergency Core Cooling Sys Suction Strainers & pressure-suppression Chamber Coating Program

ML20217P832
Person / Time
Site:	Monticello
Issue date:	08/19/1997
From:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
Shared Package
ML20217P821	List: IR 05000263/1997011 ML20217P819
References
50-263-97-11, NUDOCS 9708290011
Download: ML20217P832 (7)

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U.S. NUCLEAR REGULATORY COMMISSION REGION lil

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Docket No: 50-263 License No: DPR 22 Report No: 50-263/97011(DRS)

Licensee: Northern States Power Company Facility: Monticello Nuclear Generating Station Location: 414 Nicollet Mall Minneapolis, MN 55401 Dates: July 7-10,1997  ;

r inspectors: Donald E. Jones, Reactor Engineer, Rill Patricia Lougheed, Reactor Engineer, Rill Approved by: James Gavula, Chief Engineering Specialists Branch 1 Division of Reactor Safety

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9708290011 970819 PDR- ADOCK 05000263 0 PM

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l-I EXECUTIVE SUMMARY Monticello Station

. NRC Inspection Report 50-263/97011(DRS)

This inspection reviewed the installation of the emergency core cooling system suction strainers and pressure suppression chamber (torus) coating program. The report covers on-site inspection by regionalinspector Maintenance

The overall strainer modification had good oversight by supervisors and system engineers (Section M1.1).

• All observed installation activities were properly controlled and performed (Section M1.1).

The program and associated activities to maintain the torus coating were appropriate (Section M1.2).

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II. Maintenance M1 Conduct of Maintenanco MI .1 Suction Strainer Installation Insoection Scone (55050. 55150. 37828. 62703)

Inspectors reviewed various aspects of the emergency core cooling system (ECCS)

suction strainer installation, under Monticello Design Change Procedure MP-

'00170-01. This included a review of selected procedures and documentation awociated with the work, and discussions with maintenance workers, quality control (OC) personnel, and engineers. Lbserved activities included movement of a strainer section through the reactor building to the torus opening, torus surf ace preparation and welding for the new strainer supports, Observations and Findinas All work observed was performed with the work package present and in active us The supervisors and system engineers monitored the work progresr, and QC presence was observed during critical activities. Radiation control measures and confined space control measures for torus entry were observed to be in place and appeared to be appropriat P The movement of a now strainer across the reactor building to the torus hatchway r was witnessed. Although clearances were limited, no problems were encountered during the move. Prior to moving the strainer, the system engineer performed an independent inspection of the strainer and identified a small area at one welded joint where an opening greater than the allow;ble % inch existed. After verifying that the opening exceeded the allowable, QC generated a condition report, and inspected the remaining joints. The deficiency was resolved through the normal condition reporting proces Nondestructive testing procedures, welding procedures and associated documentation including personnel qualifications and certifications were reviewe Procedures met applicable requirements and no discrepancies were noted in the documentation reviewed. Weld filler material storage and distribution controls were '

noted and were considered acceptable. Filler material drying ovens and " caddies" were observed in the warehouse and at the job locations, respectivel For welding activities performed in Bay 11 (attachment of the strainer to the torus ring girder), and Bay 3 (attachment of the rams head to the torus suction penetration), work packages were available at each area and were appropriately consulted by the welders. Fire watches were established, and continued even when the workers were not present. Oversight by QC personnel was noted with two QC wrMing inspectors covering the night shift activities. The observed botting activities on the romshead flange in Bay 15 were conducted appropriately, in addition, the observed visual and magnetic particle non-destructive examinations were properly performe _ _ _ _ __ _ _ _ _ _ _ __ _ _ _ _ _ _ _-_____ ____ __-________ _ - - _ _ - -- _ __ _ _ _ - -

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Foreign material exclusion (FME) controls were addressed in the design change procedure. Paragraphs in the design change procedure called for ". . . removal of the FME barrier in suctioa nozzle, verify no foreign objects in suction header,"

. " . . complete foreign materialinspection of new strainers and rams head, no foreign

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objects inside strainers," and ". . .af ter lowering rams head into position install FME barrier around outside of rams head /20" [ inch! nozzle joint location." The o'aserved FME controls included the installation of wooden covers in the ECCS suction penetrations to prevent the introduction of foreign material auring the installation activitie .Canclusion't The strainer installation activities were properly performed and contro!!ed. Welding, botting, and non-destructive examination activities met the latest industry guidelines and procedures. Technicians performing these activities appeared experienced and

!c.owledgeable of their assigned tasks. Supervisors and system engineering provided good oversight of modification activitie M1.2 Ipfus Coating a, jnsoection Scopt(62703)

The internal surface inspection and coating program for the torus was reviewe Discussions were held with the engineering staff. The condition of the torus surface coating was also observed, noting the repairs made to i q Observations and Findinas Prior to installation activities for the tCCS strainer modification, the licensee inspected and repaired the torus coating as needed. During the strainer installation, controls were in place to protect the torus coating. For example, fire blankets were used to protect the torus coating from the welding, burning and grinding operations during installation activities. Subsequent to the strainer installation, the licensee painted the appropriate parts of the new installation, and inspected and repaired any damage that occurred during work activitie The torus painting surveillance performed in 1993, " Pressure-Suppression Chamber Painted Surface Internal inspection," Procedure 0135, Revision 4, and the painting procedure, " Torus Painting," Procedure 8280, Revision 0, were reviewed. Also, the certification of the coatings inspector was reviewed. No deficiencies were noted during these review Conclusions Based upon the documentation review and discussion with engineering personnel, the torus coating appeared to be maintained in an axcellent manner,

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V. Management Meelings X1 Exit Meeting Summary

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On July 10,1997, the inspectors presented the inspection results to the Plant Manage The licensee acknowledged the findings presente The inspectors asked the licensee whether any materials examined during the inspection should be considered proprietary. No proprietary information was identifie l

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PARTIAL LIST OF PEF 5 SONS CONTACTED Unensen 1 Grubb, Superintendent-Design Engineering G. Rosnow, Supervisor Site Materials P. Tobin, Senior Production Engineer M. Voth, Project Manager Licensing D. Zercher, Senior Civil Engineer NBC J. Lara, Resident inspector A. M. Stone, Senior Resident inspector LIST OF INSPECTION PROCEDURES USED IP 37828: Installation And Testing Of Modifications it 62703: Maintenance Observation IP 55150: Weld Verification Checklist IP 55050: Nuclear Welding General Inspection Procedure

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l LIST OF DOCUMENTS REVIEWED 4 awl 07.03.01, "Noncestructive Examination," Re ISi MT 1, " Dry Powder Magnetic Particle Examination," Rev. 8 ISI PT 1, " Solvent Removable Visible Dye Liquid Penetrant Examination," Rev.10 4AWi-06.07.03, " Chemical Compatibility in And On Plant Systems and Components,"

Re awl 06.03.03, " Control Of Welding / Brazing Filler Materials," Rev. 4 4 AWi 07.02.01, " Site Welding Program," Rev. 8 Job Specific Welding Data Sheet Selector Number MCO202-004, Re Welding Data Sheet Number 5390, " Fillet," Re Welding Data Sheet Number 5391, " Groove With Backing," Re Welder Qualification Maintenance Report For Northern states Power, May 15,1997 Walder Certification Report, July 7,1997  :

P Design Change Procedure MP 96Q170 01, Rev. 0 4 awl-05.01.15. " Engineering Change Request," Rev.1

. Procedure 8280, " Torus Painting," Re Procedure 0135, " Pressure Suppression Chamber Painted Surface Internal Inspection,"

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