ML19095A754

Submit Abnormal Occurrence Report No. AO-S1-75-12 Re No. 3 Emergency Diesel Generator Was Running & Feeding 2J Bus When It Failed

ML19095A754
Person / Time
Site:	Surry
Issue date:	05/09/1975
From:	Stallings C Virginia Electric & Power Co (VEPCO)
To:	Moseley N NRC/RGN-II
References
Serial No. 524 LER 1975-012-00
Download: ML19095A754 (3)

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• Pursuant to.**Surey:*I'.ower-Stati~n :Techni~:l* .Spe~~fication -6~6';n. h ..:,

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. Safety __and Operating- C~ttee;and .will ]?e*, placed ___on _.the .agenda**for* .~he

• . next meeting of the: System Nuclear Safety and_.Operating *committee~ . .

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Enclosures:

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' LICENSEE EVENT REPORT Ao-s 1_ 75 _ 12

• CONTROL BLOCK: I I I I I I 'EASE PRINT ALL REQUIRED INFORMATION]

1 6 LICENSEE LICENSE EVENT NAME LICENSE NUMBER TYPE TYPE

@EJ Iv IA Isl Pl sl 11 IO IO 1-1 0 I *O I O I O IO 1-1 0 J_QJ I 1 I 1 I O30I I31OI132I 7 8 9 14 15 25 26 REPORT REPORT CATEGORY TYPE SOURCE DOCKET NUMBER EVENT DATE REPORT DATE 7

@E]coN'T 8

IP 57 Io I 58 w59 U:.J 60 1°1sl 61 0 1~1°1 2 18 1°1 68 jOj4j3jOl7lSI 69 74 lo Is Io 17 I 7 I s I 75 80 EVENT DESCRIPTION

[filg] l Number 3 emergency diesel generator was running and feeding the "2j" bus when it 7 8 9 80

~ I failed. Several attempts were made to restart the engine but each time the engine I

7 8 9 80 lol41 I would run for several seconds and then stop. AO-Sl-75-12 I 7 8 9 80 7~89~-----------------------------------------_J 80

@m 7 8 9 ' PRIME 80 SYSTEM CAUSE COMPONENT COMPONENT CODE CODE COMPONENT CODE SUPPLIER MANUFACTURER VIOLATION 7

[ill I E!E I W 8 9 10 11

!E!Nlc!rlNIEJ 12 17 w 43 I EI 44 1 I 41 71 47

~

48 CAUSE: DESCRIPTION

~ I Electro-Motive Div. of GM Model 645E4 diesel engine. Planetary and spline shaft gears!

7 8 9 80 I of

. I

~ the mechanical drive of the turbo-blower were partially stripped of teeth. The 7 8 9 I

[TI§] I mechanical dri_ve is design~d to run the turbo-blower only long enough .for the (cont' d~l-7 8 9 80 FACILITY METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION 7

EE]

8 w

9 10 11 Io 1-0 I 12 13 N/A 44

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45 I N/A 46 80 FORM OF ACTIVITY CONTENT LOCATION OF RELEASE rn 9w RELEASED OF RELEASE AMOUNT OF ACTIVITY 7 8 Lu 10 I

11 N/A I 44 45 N/A 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

~ lO IO!OI Lu N/A 7 8 9 11 12 13 80 PERS'ONNEL INJURIES NUMBER DESCRIPTION N/A 7EE]8 9 1° 1°1°111 1';:;-2_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __J80 OFFSITE CONSEQUENCES 7

IiliJ8 9 N/A BO LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION 7

~EJ 8 9 10 N/A BO PUBLICITY 7E089~---------------------------------------------1 N/A 80 ADDITIONAL FACTORS

~ jThe failure of No. 3 emergency diesel generator led to the trip of Unit No. 1 reactor I 7 B 9 BO

[Tifil I through the following sequence of events. Breaker 25J8 was being tested and (cont'd) 7 8 9 80 NAME: E. M. Sweeney, Jr. PHONE: (804) 357-3184 GPO 681,667

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CAUSE DESCRIPTION (cont'd) engine speed and exhaust temperature to cause the turbine drive of the turbo-blower to overrun the mechanical drive and disengage the clutch. The turbo-blower is then run by the exhaust gases being fed into the turbine drive. In this case the engine speed and loading were not sufficient to disengage the mechanical drive. Corrective action is to ensure the engine speed and loading are sufficient to disengage the mechanical drive to the turbo-blower. The above failure could have rendered this diesel incapable of performing its intended function.

ADDITIONAL FACTORS (cont'd)

No 3 diesel was suppling the 2J bus; therefore, failure of the diesel caused breaker 25J8 to trip which resulted in the tripping of breaker 15Fl (Double Protection Circuitry) and the loss of bus lH on Unit No. f. One of the inverters supplying the 110 volt vital buses was out of service which, with the loss of the lH bus, dropped another 110 volt vital bus and tripped Unit No. 1 reactor.