ML20058L067

Ler.On 750912,while Conducting Local Leak Test,Msivs AO-2-80C & 86C Found Leaking in Excess of Tech Spec Limits. Cause Unknown.Pilot & Poppet Seats Lapped

ML20058L067
Person / Time
Site:	Monticello
Issue date:	11/11/1975
From:	Grue T NORTHERN STATES POWER CO.
To:
Shared Package
ML20058L058	List: ML20058L055 ML20058L059 ML20058L067 ML20058L074 ML20058L079 ML20058L089 ML20058L105 ML20058L107 ML20058L116
References
LER-LER-751111-02, LER-LER-751111-2, NUDOCS 9105070377
Download: ML20058L067 (1)

Text

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LICENSEE EVENT REPORT CONTROL BLOCK l l l l l l l [PLEASE PRINT ALL REQUIRED INFORMATION) 1 6 K E N;t t t rC E NSE E vtNT N AL't L IC E N St Nuytsi k T

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' 69 M lN l M l N l Pl 1l 14 l 0 l 0l-l 0 l 0 l 0l 0{ Ol-l 0l0 l l4 l 1 l1l 1l 1l l 0l1l 1b 25 26 33 31 32 cA'I Gau occ* s ' Nuvst n E. TNT Datt 4tpom7 CATE hCO*rT l Pl d y'7p[ lLl s D $t l0 l5 l 0 l-l 0 l 2 l 61 3l l 0 l 9l ll 2l 7 l 5 l l1 l1 l 1l 1l 7l 5l 7 8 57 be 39 co e, se e9 74 73 80 EVENT DESCAiPiiON

$ IV,ile conductine local leak test it was found that main steam isolation valves l 7 89 80

@ l AO-2-80C and 86C vere leaking in excess of Technical Specification acceptance cri- l 7 89 80

$ !teria.

7 89 Pilot and main poppet seats were lapped. Retested and passed local leak l 80

$ l test for combined leakare. Similar previous events. (AO-2 67 / 75- 17-2 ) l 7 89 80

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17 lA l lA l5 l8 l 5l [Y l 43 44 47 48 CAUSE DESCAtPTION gg {Atwood and Morrill Company, 18-inch Y Type Globe Valve, Drawing 20786-H. Cause of l 7 89 BD EE lleakare unknown. Pilot and poppet seats lapped.

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80 PERSONNEL EXPOSURES NUVBEE l DE SIAIPTION DE D l0l01 y'Et I:A l 7 69 11 12 13 BC PERSONNEL INKA ES NevEEE Ots: Art ;4 EE h l0 l0l l!:A l 7 89 11 12 60 O U S:TE CONSEQUENCES p;A l

7 89 80 LOSS CR DAMAGE TO FACIUTY Y + PE DE SC Arp'0N NA 7 S9 10 63 PuBLICIT Y 3 lv 7 89 l

80 ADD.T 6DN4L FLCTCAE

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