05000311/LER-1981-023-01, /01T-0:on 810522,main Steam Isolation Valves Failed to Close within Required 5-s During Startup Test. Caused by Design Error.Design Change Developed to Allow for Proper Interaction of Hydraulic & Steam Closing Subsys

/01T-0:on 810522,main Steam Isolation Valves Failed to Close within Required 5-s During Startup Test. Caused by Design Error.Design Change Developed to Allow for Proper Interaction of Hydraulic & Steam Closing Subsys

ML20004E739
Person / Time
Site:	Salem
Issue date:	06/02/1981
From:	Espey J Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20004E737	List: 05000311/LER-1981-023, Forwards LER 81-023/01T-0.Detailed Event Analysis Encl 05000311/LER-1981-023-01, /01T-0:on 810522,main Steam Isolation Valves Failed to Close within Required 5-s During Startup Test. Caused by Design Error.Design Change Developed to Allow for Proper Interaction of Hydraulic & Steam Closing Subsys
References
LER-81-023-01T, LER-81-23-1T, NUDOCS 8106150144
Download: ML20004E739 (1)

LER-1981-023, /01T-0:on 810522,main Steam Isolation Valves Failed to Close within Required 5-s During Startup Test. Caused by Design Error.Design Change Developed to Allow for Proper Interaction of Hydraulic & Steam Closing Subsys

Event date:
Report date:
3111981023R01 - NRC Website

text

CRC FORM 366 U. S. NUCLE AR GEGULAToRY COMMISSION (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK. l l

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lh (PLE ASE P; TNT C3 TYPE ALL CEQUIRED INFOZMATIONI (j

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7 8 9 LaCENSEE CODE 14 LICENSE NUMBER 25 26 LICENSL TYPE JD 57 CAT $8 CON'T IJI11 5$ "C[ l Ll@l 01 5l Ol 0101 31 il 1l@(l 0l 5l 2 l 2l 81 @l nl El 012 l 8l 1l@

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60 61 DOCKET NUMBER 68 9

EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROB ABL'E CONSEQUENCES b10 g

ring the performance of Start-up TeTt (Sup-53) the Main Steam Isolation Valves y l failed to close within the required 5 seconds. The closing time was verified as l

lo ;4 l l8.63 seconds.

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CAUSE

CAUSE COVP VALtf CODE CODE SUBCODE COMPONENT CODE SUBCODE SU8COCE l0l9l lClDlh h

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10 11 12 IS 18 19 20 SE QUENTI AL OCCUARENCE REPORT REsiSiON LER RO EVENT YE AR REPORT NO CODE TYPE No h aEgai l8l1l l-l l 0l 2l 3l l/l l0l1l lT l b

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i j o l lThe change over from normal hydraulic closing to emergency steam closing had not l

li ;i j [ allowed for this in eraction. A time delay relay was installed for Unit 2 by DCR-lEC-12 30

,, j7g lDCR-2EC-1229 and the valves were retested satisfactorily at 3.9 seconds.

g gi;3l lwill be incorporated in Unit 1 prior to the next plant start-up.

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8 9 80 ST A 5

% POWER OTHE R STATUS DISCO RY DISCOVERY DESCRIPTION Wh l0 l 0 lC l@l Not Applicable l

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1 5 ACTivlTY CONTENT nELE ASto OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELE ASE W h l zl@l NA l

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8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUM8ER TYPE DE SCRIPTION LTE] I 01 of Ol@l zl@l NA I

P3RSONNa'IN;U 'IES otSCRe noNh NuMeER lalolol@l 1 8 NA 7

8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY TYPE DE SCRIPTION h!

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8 9 to 80 ISSU DE SCRIPTION a l Ol LulE @LaA I

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68 69 80 NAV OF PREPARER PHONE-

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