ML20235F070

Ro:On 720731,HPCI Sys Failed to Start & Run Properly During Simulated Automatic Initiation Fast Start.Caused by Pieces of Plastic Cap in Pilot Valve Oil Inlet Port.Fragments Removed & Valve Inspected

ML20235F070
Person / Time
Site:	Monticello, 05000000
Issue date:	08/03/1972
From:	Mayer L NORTHERN STATES POWER CO.
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20235B311	List: IA-87-111, Submits Rept on Plant,As Discussed in ACRS 150th Meeting on 721012-14.Listed Items Can Be Resolved During Const & Facility Can Be Constructed W/Reasonable Assurance for Operation W/O Undue Risk to Public Safety IR 05000254/1972009 IR 05000358/1972003 IR 05000358/1973001 IR 05000358/1973002 IR 05000358/1973003 IR 05000358/1973005 IR 05000358/1973006 IR 05000358/1973007 IR 05000358/1974001 IR 05000358/1974002 IR 05000358/1974003 IR 05000358/1975004 ML20235B308 ML20235B364 ML20235B401 ML20235B405 ML20235B424 ML20235B456 ML20235B461 ML20235B465 ML20235B477 ML20235B488 ML20235B507 ML20235B552 ML20235B582 ML20235B585 ML20235B588 ML20235B605 ML20235B618 ML20235B623 ML20235B649 ML20235B656 ML20235B662 ML20235B670 ML20235B679 ML20235B683 ML20235B687 ML20235B702 ML20235B708 ML20235B713 ML20235B714 ML20235B718 ML20235B720 ML20235B730 ML20235B734 ML20235B748 ML20235B754 ML20235B762 ML20235B764 ... further results
References
FOIA-87-111 NUDOCS 8709280399
Download: ML20235F070 (1)

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NSF NORTHERN STATES POWER COMPANY Minneapolis, Minnesota 55401 August 3, 1972 Regulatory File Cy. <, " .-

N Mr. A. Giambusso 7-Deputy Director for Reactor Projects @ e,. (/7 /pg -

-- I United States Atomic Energy Commission -

Q Washington, D. C. ,fjfD .y j .? g ,/

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Dear Mr. Giambusso:

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NDNTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 Fast Start Failure of the High Pressure Coolant injection System A condition occurred at the Monticello Nuclear Generating Plant recently which we are reporting to your office in accordance with provisions of Section 6.6.B.2 of Appendix A, Technical Specifications, of Provisional Operating License DPR-22. T he Region 1 l l Regulatory Operations Office has bee.n notified of the oCCu rrence.

During the plant startup on July 31, 1972, following maintenance of the HPCI exhaust line check valves, a simulated automatic initiation fast start of the HPCI system was attempted. The system failed to start and run properly. Instru-mentatinn indicated that the turbine control valve was not responding properly to the governor control signal. Inspection of the control valve hydraulic actuating system revealed several pieces of plastic pipe cap in the pilot valve oil inlet port. The plastic fragments were removed and the remainder of the valve was inspected and found satisfactory. The power piston and governor servo mechanism were also disassembled and inspected. No further abnormalities were found.

After reassembly of the control valve actuating system, several fast starts were attempted. In all cases, the system performed properly.

An Abnormal Occurrence Report will be available at site for the Regulatory Operations i nspectors.  ;

Yours very truly, @ g MAAgL. O. Mayer vgp i Director of Nuclear Support Services (-f 4(/g y 2 19/ggts /,

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cc: B H Grier 6 0 t pk ,.

_N 4a38 9709280399 870921 PDR FOIA PDR a MENZB7-111