05000263/LER-1977-024

LER 77-24-7:on 770910,A Outboard MSIV Found Leaking in Excess.Caused by Plug Being Slightly Out of Round.Seats Lapped & Valve Retested

ML20056B877
Person / Time
Site:	Monticello
Issue date:	11/18/1977
From:	Tobin P NORTHERN STATES POWER CO.
To:
Shared Package
ML20056B870	List: 05000263/LER-1977-024 ML20056B869
References
LER-77-24-7, NUDOCS 9102130570
Download: ML20056B877 (1)

LER-2077-024,

Event date:
Report date:
2632077024R00 - NRC Website

text

i LICENSEE EVENT REPORT ,

CONTROL BLOCK l l l l l l l (FLEaZE DIINT ALL RECUIRED INFO 2MATION) 1 6 acEN5f f E rCt NSE fvtNT

r. A u f EC' iE NsMBEn TvPE T vPE 01 M lN l Ml NlP l 1l l0 l0 l-p l0 l0 l0 l 0 l-l0 l0 l l 4 l 1 l 1l 1l1 l l0l1l l 7 89 14 15 25 26 33 31 32 '

I C A T E G D8"

• 5 E DDC*E T NuvDER EVENT DATF NfPOAT CATE 01 COvi l 7 6 57 l l y W l0 l5 l 0 l-l 0l 2l 6! 1 l0 l9 l1 l 0 l 7 l 7l l 1l Il 1l817 l 7l 58 59 60 61 68 69 74 75 80 EVENT DESC ASTION -

0 l While perfoming local leak rate tests, the "A" outboard MSIV, A0-2-86A, was found l 7 69 60

@ l 1eaking in excess of the technical specification acceptance criteria. Redundant l 7 89 83

$ lisointion valve leakinn at a ra te of 14.64 SCFH. Previous sirailar events. Valve l 7 89 80 ll l seats lapped (M-RO-77-24-7) l 7 89 80 bI 7 89 l

55mg 80 Sv s't M cacSE CDMDONI NT COMPONE N1 On DE CODE CoupDNfNT CODE SJ'PUE A MANuf ACTUHip Wna'ON c

7 89 10 l r!n l d 11 lV l A l L l Vl El X l 12 17 y

43 l A l 5 l 8l 5l 44 47 y

48 '

CAUSE DESCAiPTION o l Atwood and Morrill Co. 18-inch, Y type globe valve, drawing 20786-H. Failed Icak j 7 89 80 EE l rate test due to plug being slightly out of round. Seats lapped and valve retested l 7 89 80 DE I satisfactory. l .

• s Cc'

• VITHOD OF SitA:s  % POM A DTHEA STATUS D 5COVEAv D!SCOvf RV DE SCAiPTION

@ y l0 l 0l 0l l KA l lBl l KA l 7 b 9 10 12 13 44 45 46 80 ACtviv CONTtNT Af sf ASED 84 L E ASE AMDUN' Or ACTiv.Tv 1

y O' y l EA l l KA L OC AT&ON OF LEt.E ASE l

7 8 9 10 11 44 45 60 PERSONNEL ExPOSUAES Never n T.+1 ot sOnamoN 8 i 010 l 0111Lz_J 7 89 l NA l

12 13 80 PERSONNEL INJUR'ES

'UV E2E H DELC wilDN 3 l 0l0 l 0l11l 12EA 7 89 l eg OFFSTE CONSEOUENCES BE I KA I 7 89 80 LOSS OR OAMAGE TO F ACILITY T v pl DE scn pT ON 7 e9 10 so PUPtiCITY 1

l KA 7 89 l 80 ADDITIONAL FACTORS

@ { EA l ,

7 89 '

B0 DE I l l 7 89 BD NAVE. P A Tobin PHONEx 612/295-5151 GPC 881 537 9102130570 771118 CF ADOCK 05000263 CF

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