ML19209A918

Submits Response to IE Bulletin 79-14.Item of Nonconformance Discovered Re Auxiliary Feedwater Sys (Ref LER 79-25).Visual & Analytical Insp of as-built Supports Will Be Completed within 120 Days

ML19209A918
Person / Time
Site:	Prairie Island
Issue date:	08/31/1979
From:	Wachter L NORTHERN STATES POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NUDOCS 7910050624
Download: ML19209A918 (3)

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- HSP NORTHERN STATES POWER COMPANY M I N N E A PO LI S. M I N N E S OTA 5 5 401 August 31,.1979 br. James G. Keppler Director - Region III Office of Inspection and Enforcement United States Nuclear Regulatory Comr... ,sion 799 Roosevelt Road Glen Ellyn, Illinois 60137

Dear Mr. Keppler:

PRAIRIE ISLAND NUCLEAR GENERATING PLANT Dockets No. 50-282 and No. 50-306 In response to Item 2 of IE5.ulletin 79-14, the following is offered:

The inspection directed to be dore by IE Bulletin 79-14 is being conducted in two parts. These parts are first, physical, and second, analytical.

A. Physical Inspection The physical inspection included the actual verification of as-built drawings by direct measurement and comparison. Inspection elements involved in the physical inspection were piping geometry, suppdrt/

restraint design, support / restraint location, support / restraint function / clearances, valve and valve operator locations, and pipe attachment details. Teledyne Engineering Services (TES) Procedure P-3697-1 and TES personnel were utilized for the actual inspection.

Asindicatedinthe30-dayresponse,drawingpackageswerede$ eloped to aid in the walkdown of the piping systems. TES personnel attached a summary sheet f or each package completed listing the discrepancies (if any) which were found. Discrepancy report forms were then made out for each discrepancy reported by TES. These discrepancy report forms will be used to help track the resolution of the discrepancies and help provide input to Fluor Pioneer Services (FPS), the plant's A/E, analytical inspection.

B. Analytical Inspection The analytical inspection portion involves the verification of the input information into the seismic analysis. The basic approach being used is to compare every walked-down isometric drawing and hanger drawing and compare them with the data used for the seismic analysis. Included in this review by r 3 are the valve weights, 1105 015 SEE 4W 7910050[,2Y

NORTHERN STATES POWER COMPANY

- Mr. James G. Keppler August 31, 1979 Page 2 any offset center of gravity concerns and materials of construction from the quality assurance records. This approach to the analytical inspection is being used to insure that even drawings which don't differ from the as-built configure ion are reviewed.

C. Extent of Inspection to Date All accessible piping in the plant which falls under the scope of this Bulletin has been inspected physically. Also, the piping systems in the Unit 1 Containment Building have been inspected.

The only area left to be inspected is in the Unit 2 Containment Building. The physical location of both systems in each set of redund ant systems and non-redundati systems included in the scope have been completed.

The analy'.ical inspections for these piping systems have not been completed but are in progress at the present time.

D. Results of the Inspection Through the conduct of the physical inspectian, 270 piping packages were inspected. This resulted in the report of approximately 126 reports of discrepancies. Of these discrepancies,10 non-conformances were identified of which one was determined to affect the operability of a system.

The non-conformance, which was identified as affecting the operability of a cystem, involved the Auxiliary Feedwater System (Licensee Event Report No. 79-25). A single rigid hanger assembly (Mk. No. afb'H-34) was found not to be attached to the pipe. Inspection of the area indicates that the hanger has never been attached. Immediate action was taken to repair the hanger. The work is complete.

The remaining nine non-conformances involve minor physical adjustment or modification to supports to make the supports agree with the as-built documentation.

The approximately 116 deviations require some drawing revision, but do not significantly deviate from the original design to require physical modifications.

Results of the analytical inspection are not available as yet.

Additional discropancies may result from this effort. Any new

. discrepancies will be handled in the manner used for the physical inspection.

Il045 016

NORTHERN STATES POWER COMPANY Mr. James G. Keppler August 31, 1979 Page 3 E. Actions to be Taken as a Result of the Inspection The non-conformance found which was determined to affec. the operability of a system was immediately repaired.

The other non-conformances will be handled as normal repair work consistent with plant directives and completed on a priority basis.

Since many of the deviations will require drawing revisions, these documents will be revised to reflect the "as-built" conditions of the plant. This effort will most probably be accomplished af ter the analytical inspection is complete.

Very few deviations were noted as the result of modifications to the plant. All modifications to plant design are handlad by the plant's Design ('_2nge process which requires the revising of prints and documents.

F. Conclusions The walkdown physical inspection of the piping systems, with the exception of Unit 2 Containment, is complete. While numerous deviations exist among the as-built documents, only one significant non-conformance was discovered. This result lends consideratie credibility to the status of the as-built documents. Therefore, it is expected that very few additional problems will be uncovered as a result of the analytical inspection process.

By the time of the next response (120 day report), the entire inspection effort including the analytical inspection will be complete.

The Unit 2 containment inspection is still planned for the next refueling outage (January,1980) or earlier if an unplanned outage of sufficient duration occurs.

Yours very truly, h ]$1 L. J . 'achter' ' ~'

Vice President Power Production and System Operation ec: Mr. G. Charnoff 05 017 Director - Office of Inspection and Enforcement Washington, D.C.

Director - Division of Operating Reactors Washington, D.C.