ML20040A570

LER 82-001/01T-0:on 820102,outboard Shutdown Cooling Suction Isolation Valve Found to Exceed Tech Spec Limits for Local Leak Rate Test.Caused by Valve Disc,Undersized by Extensive Lapping of Disc & Valve Body Seats,Traveling Too Far

ML20040A570
Person / Time
Site:	Monticello
Issue date:	01/15/1982
From:	Tobin P NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20040A566	List: ML20040A565 ML20040A570
References
LER-82-001-01T, LER-82-1-1T, NUDOCS 8201210254
Download: ML20040A570 (1)

Text

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NRC FORM 366 U,5.. NUCLEAR REGULATORY CC?.WiMtON (7 77)

. LICENSEE EVENT REPORT CONTROL BLOCK: [l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

I b j o l 8t 9l l MlLICENSEE 7

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26 LICENSL TYPE JO bl CAI bS CO'J'T loI1I 3 8 s ,n E lL 60 l@dl 5 l 0DOCKET 61 l 0 lNUYSEH 0 l 2l 6l 3l@l tid 69 0 l 110 l 2 l 8 l 2'l@] OlHEPORT kVEN T DATE 74 75 ll ll DATE 5! 81 2l@ 80 EVENT DESCRIPTION AND PRO'4 ABLE CONSEQUENCES h

[Ol2i LDuring surveillance testing, outboard shutdown cooling suction isolation valve. 9

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[ o i a ; l MO 2030, was found to exceed TS 4.7. A.2.f t.cceptance criteria for LLRT. Inboard l I o I.1 l isolation valve was operable and within the acceptance criteria fcr LLRT. One l

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l o I s l I previous similar event (RO-81-012). No effect on public health and safety. l 10161l l l O 171 l l 101811 l

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,_ SE QUE N TI AL OCCURRENCE REPORT R E VISION LER AO EVENTVEAR REPORT NO. CODE TYPE NO

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_ 21 22 23 24 46 21 23 29 30 31 JJ TA EP ACT ON ON PLA T METH HOURS SUB T D FO Us. S PPLIE MAN FACT RER l3JA l@l347. l@ lJS 7.l h [36.Z_jh 3/l0l0l0l0l 40 l41 Nl@ l42 Y lg l43 Al@ lAl3l9l1[g 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h ji j o l l 18" gate valve, drawing 2288-5. Valve disc traveling too far due to undersize g 1 i l i 1 [ disc. Valve disc undersize due to extensive lapping of disc and valve body seats i

[iiyl l during previous repair of valve. Disc replaced and valve retested satisfactorily.l lilall ___ l 11 14 11 1

7 8 9 STA S  % POWER OTHER STATUS ISCO RY DIJCOVERY OESCRIPTION Ii is] W@ l 0]O l0 l@l NA ~

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ACTIVITY CO TE N T RELE ASED OF RE LE A M AYOUNT OF ACTIVITY LOCATION OF RELE ASE NA I i 16m 9I iz_] @ toLz_18L NA 7

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PERSONNEL t NPOSURES 80 NUYBE R TYPE DESCRIPTION d-li l 7"l 'l0 l 0 l 0 l@l Z l@l NA l

PEoS;..mE L IN;&s 8" NuvaE R DESCRIPTION  :

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80 LOSS TYPE 05 DESCRIPTION On DAM AGE TO F ACILITY '

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NAMFOFPR P. A. Tobin (612)295-5151 o PHONE:

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