05000348/LER-1981-053-03, /03L-0:on 810728,diesel Generator 1C Tripped Under Load & Declared Inoperable.Caused by Failed O Ring Between Cylinder Liner 11 & Cylinder,Allowing Water to Enter Cylinder & Overflow to Other Cylinders

/03L-0:on 810728,diesel Generator 1C Tripped Under Load & Declared Inoperable.Caused by Failed O Ring Between Cylinder Liner 11 & Cylinder,Allowing Water to Enter Cylinder & Overflow to Other Cylinders

ML20010F024
Person / Time
Site:	Farley
Issue date:	09/02/1981
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010F017	List: 05000348/LER-1981-053, Forwards LER 81-053/03L-0 05000348/LER-1981-053-03, /03L-0:on 810728,diesel Generator 1C Tripped Under Load & Declared Inoperable.Caused by Failed O Ring Between Cylinder Liner 11 & Cylinder,Allowing Water to Enter Cylinder & Overflow to Other Cylinders
References
LER-81-053-03L, LER-81-53-3L, NUDOCS 8109090276
Download: ML20010F024 (2)

LER-1981-053, /03L-0:on 810728,diesel Generator 1C Tripped Under Load & Declared Inoperable.Caused by Failed O Ring Between Cylinder Liner 11 & Cylinder,Allowing Water to Enter Cylinder & Overflow to Other Cylinders

Event date:
Report date:
3481981053R03 - NRC Website

text

LICENSEE EVENT REPORT 4

"ONTROL 8 LOCK: l l

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7 8 9 LJCENSEE CCOE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE Jo 57 CAT 58 f1

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d 60 63 OOCK ET NUMBER 6a 69 EVENT OATE 74 75 REPCRT DATE 30 E'. ENT DESCRIPTION AND PROBA8LE CONSECUENCES h Io i 2 I I At 1930 and 2320 on 7/28/81, while performing a one hour load run, diesel generator 1C l

[ o I a_j l was declared inoperable when it tripped under load. At 0050 on 7/30/81, while attempting l l o 14 l l to perform FNP-1-STP-28.1 (DG 1C Operability Test) DG IC was again declared inoperable l

.j o l 5 l lwhen it failed to start. % ch. Spec. 3.8.1.1, in part, requires DG 1C to be operable.

l l o is I l Tech. Spec. ?.8.1.1, action statemeit requirements were met.

Health / safety of the public 10 l 7 l lwas not affected.

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7 5 9 60 SYSTEM

CAUSE

CAUSE COMP.

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SUP LIE MANUFAC RER v 33 34 35 J6 J/

40 41 42 43 44 47 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS

- l1 l 0 l l An investiention inta the cause of the failure to start on 7/30/81 revealed that an "0" IiI,] l ring between the number 11 cylinder liner and cylinder had failed allowing water to enter j

,,;7; jthe number 11 cylinder and overflow to several other cylinders via the intake air mani-l l,;3; l fold. The water in the cylinders caused a " Hydraulic Lock when the engine start was j

g,;4; l attempted. An extensive disassembly and inspection by the manufacturer and licensee g

7 8 9 80 ST

% PCWER OTHER STATUS SO RY DISCOVERY DESCRIPTION l1 l 5 l l E lh l 1 l 0 l 0 l@l NA l

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ACTIVITY CC TENT ld l Z l @D OF RELEASEJQl RELEASE AMOUNT CF ACTIVITY LOCATION CF RELEASE lZ NA l

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8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUM8ER TYPE CESCHIPTION l t l 7 ) l 0 l 0 l 0 lhl Zl@l NA l

PERSONtJ E L INJURIES NUM8ER CESCRIP TION l1 lajl0l010l@l NA l

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11 12 80

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LOSS OF CA OAMAGE TO FACILITY TYPE OESCRIPTION [t, 9 l7.lhl NA l

7 8 9 10 30 ISSUE OF CRIPTION e

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'. 8109090276 810902 sa s9 s0 s PDR.ADOCK 05000348 W. G. Hairston, III o

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' PHONE:(205) 890-5156

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LER 81-053/03L-0 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (Continued):

personnel revealed that the " Hydraulic Lock" resulted in damage to the number 1 and 11 piston inserts and bushings, the lower thrust bearing and the vertical drive assembly. All damaged parts were replaced and as a further preventative measure, all cylinder liners (except number 10 which was replaced in May,1981), upper and lower piston rings, upper piston inserts and additional miscellaneous parts were replaced to restore the engine to a reliable condition. As a result of the dis-assembly and inspection, the DG 1C trips experienced on 7-28-81 are believed to have been caused by high crankcase pressure due to possible flashing of water in the combustion chamber and/or lube oil sump which may have been precipitated by the "0" ring seal leak. The DG did, however, meet the operability acceptance criteria of FNP-1-STP-28.1 when started on 7-29-81 and was operable from 0015 on 7-29-81 until 0050 on 7-30-81.

Due to the magnitude cf the work involved, the Tech. Spec limit of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> allowed for DG inoperability could not be met.

A temporary Tech. Spec. change ex-tending the total outage time to 9 days was granted by the NRC on 7-31-81.

An additional 6 day extension was granted on 8-7-81.

Following the completion of all necessary repairs and break-in testing, DG IC was returned to service at 2143 on 8-13-81. A similar event was reported in LER 81-032/03L-0.

(NOTE:

These incidents involve the fourth failure in the last 100 valid tests.)