ML20058L059

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

ML20058L059
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-751111-01, LER-LER-751111-1, NUDOCS 9105070375
Download: ML20058L059 (1)

Text

LICENSEE EVENT REPORT -

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$8 59 60 E1 68 69 74 75 80 EtENT DESCASTON

@ l While conducting local leak rate test it was found that main steam isolation valveq 7 89W 80

$ l A0-2-80A and A0-2-86A we re leakinc in excess of Technical Specification acceptance l 7 89 80 g[ l criteria.

Pilot and main poppet seats were lapped.

Retested and passed local l

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l 1eak test.

Si ilar previous events.(AO-263/75-17-1)

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[LJ 7 89 10 11 12 17 43 44 47 48 CAUSE DESCAIPTION Oe l Atwood and Morrill Company,1E-inch Y Type Globe Valve, Drawing 20786-H.

Cause of l 7 89 80 BE I leakare unknown.

Pii o: ana connet seats lapped.

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