ML19305B325

LER 80-011/01T-0:on 800227,while Testing Diesel Generator 21,unit Failed to Reach Rated Speed in 10-s or Less.Caused by Slow Response of Diesel Generator Governor.Governor Replaced & Will Be Inspected & Overhauled by Manufacturer

ML19305B325
Person / Time
Site:	Calvert Cliffs
Issue date:	03/12/1980
From:	Davis S, Huseby D BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19305B322	List: ML19305B321 ML19305B325
References
LER-80-011-01T, LER-80-11-1T, NUDOCS 8003190531
Download: ML19305B325 (2)

Text

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7 60 68 COCKET NUM8ER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lO la i lAt 1410 while testing 21 diesel generator it failed to reach rated speed in I frm 11 10 sec. (T.S. 3.8.1.1) . At this time 21 Low Pressure Safety Injection i 10 :41 l(LPSI) pump was out of service for repairs. 21 diesel supplies emergency l f5Tsl loower to 22 LPSI pump, operability requirements (T.S.1.6) were not satis- i f5 ITl ified. 21 diesel was left runnino. After 21 LPSI was returned to service l l O I 71 lat 1830, the diesel was shutdown for troubleshooting. 21 diesel was re- l l C is I lturned to service at 1320 on 2/29/80. This is not a repetitive occurrence. 80 I

7 8 9 E CODE SUSC E COMPONENT CODE SU8CQdE SU E 7

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33 34 35 36 37 40 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h ii ; O l l Problem was caused by slow response of the . diesel generator governor. i ,

ii li i I Governor was replaced with a new unit and will be inspected and overhauled i ii i 21 I by the manufacturer to detennine and correct the cause of failure. Each I l

t i l a i I diesel cenerator covernor will underco this insoection and overhaul to U,j,4j l orevent recetition of the oroblem. (Woodward Model #EG-B10) l STA  % POWER OTHER STATUS DIS RY DISCOVERY DESCRIPTION li I s l [Ej@ l 018181@l NA l l B l@l Routine Test / Operational Event 80 i

A TlVITY CO TENT RE AMOUNT OF ACTIVITY LOCATION OF RELEASE NA NA l fR*'l-@LE ASED OF RELEASE-Zl@l l l PERSONNEL EXPOS ES NUM8ER TYPE DESCRIPTION l

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PERSONNEL INJURIES NUMBER DESCRIPTION NA I

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6 NAME oF PREPARER.,$' M* avis /D. E. Himah,u psong; {

LER NO. 80-11/01T DOCKET NO. 50-318 EVENT DATE 02/27/S0 REPORT DATE 03/12/80 ATTACHPINT

~~ . ___.

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES:

While performing routine surveillance testing on #21 Diesel Generator at 1410 on February 27, 1980, it was discovered that the diesel did not achieve rated speed in less than 10 seconds as required by Tech-nical Specification 4.8.1.1.2.a.4. A follow-up test was performed at 1428; rated speed and voltage was achieved in 16 seconds. During this time, #21 LPSI pump was tagged out of service to perform coupling alignment checks due to higher than normal vibration (vibration in the " alert" range). This pump had been out of service since 0700 on February 25, 1980. Since #21 Diesel Generator provides emergency

. power to #22 LPSI pump the operability requirements (Technical Specif-ication 1.6) were not fully satisfied for this pump.

Subsequent to the test performed at 1428, #21 Diesel Generator was left running and aligned to 4 KV Unit Bus 24 to assure an emergency power source to #22 LPSI pump.

At 1830, #21 LPSI pump was returned to service. Subsequently, #21 Diesel was removed from service to allow trouble-shooting. #21 Diesel Generator was tested satisfactorily and returned to service at 2100. However, at 0525 on 2/28/80, #21 Diesel Generator again failed to achieve rated speed in less than 10 seconds when tested prior to placing #21 Salt Water System out of service for maintenance.

The diesel was restarted and aligned to 4 KV Bus 24 at 0535 in order to satisfy the. emergency. power requirements (T.S.1.6) for #22 Salt Water System while #21 Salt Water system was out of service. At 0620 following completion of maintenance on #21 Salt Water System

1. 21 Diesel Generator was again placed out of service for trouble- "

shooting. #21 Diesel Generator was retested and returned to service at 2100. During the entire time both normal offsite AC power sources and the redundant emergency diesel generator remained operable.

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