ML20154F323

Special Rept:On 880811,fuel Oil Leak Required Engine Shutdown & on 880812,Train B Emergency Diesel Generator Tripped.Caused by Incorrect Setting of Water Jacket Temp Controller.Adjustment Knob Protected from Misadjustment

ML20154F323
Person / Time
Site:	Seabrook
Issue date:	09/09/1988
From:	George Thomas PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
NYN-88123, NUDOCS 8809190353
Download: ML20154F323 (2)

Text

- _ _ _ _ _ __

7 N ue George S. Thomas Wee hesk$enbNuclear hodvetion UI NYN- 88123 Put2c SoMee of New Hampshire New Hampshire Yankee Division United States Nuclear Regulatory Commission p Washington, DC 20555 Attention: Document Control Desk

Reference:

Facility Operating License No. NPF-56, Docket No. 50-443

Subject:

Diesel Genetator Special Report Gentlemen:

The B Train Emergency Diesel Generator (EDG) was shutdown once on both August 11 and 1.. 1988, during maintenance testing activities. In accordance with Regulatory n4sition C.3.6 of Regulatory Guide 1.108. Revision 1. Aup,ust 1977, a determination has been made that these events are not considereu valid l tests r test failures. These events are being reported pursuant to Technical Specifications 4.8.1.1.3 and 6.8.2. At the time of these events the plant was i

in HODE 5 (cold shutdown) with the A Train EDG operable.

On August 11, 1988, at 1830, while performing post-maintenance testing and data collection on the B Train EDG, a fuel oil leak developed which required the engine to be shutdown. The leak came from the diesel fuel oil pump which had previously undergone maintenance. Corrective actions were performed to repair the fuel oil leak and during subsequent testing no furcher fuel oil leakage was observed.

On August 12, 1989, at 1030, the B Train EDG tripped on high jacket water temperature during post-maintenance testing. The engine trip was caused by an incorrect setting (,f the wt. tar jacket temperature controller which resulted in a higher temperature setpoint. The incorrect temperature controller setpoint s was caused by personnel in the area accidently bumping the temperature setpoint adjustment knob to a new position during area activities. Corrective action to add a cover or otherwise protect the controller setpoint adjustment knob has been initiated to prevent any future occurrenceJ of this type.

The determination that these events are not considered valid tests or test failures is based on the following:

When the EDG is operating under the work controi program during g maintenance testing for data collection and engine performance monitoring it is not considered a valid test condition, and g, testing that is termin.ted intentionally is not considered a valid test or failure. In this pasticular instance, the leak would not have prevented the EDG from performing in an accident O condition. The high temperature engine trip is bypassed during Q emergency operation. Had there been a bonafide emergency start g signal the engine high temperature alarm would have actuated g alerting the operator of an abnormal conditions however, the  !

y EDG would have continued to operate without automatically

[

g tripping.

a.co O P.O. Box 300. Seabrook, NH 03874 . Telephone (603) 474 9574 '.

. ~

r h4 w

Unitsd Stctos Nuc1 car Regulatory Commission Ssptember 9g 1988 Attention: Documsnt Control Desk Page 2 Given the events and conditions outlined above, both events are non-valid test? or'tast failu.res and do not count toward events that are considered l vaild tests or failures. No additional surveillance testing will be performed as a result of these events.

1 Corrective Actions Due to naturs of post-maintenance testing there are no corrective actions that cra be performee as a result of the fuel oil leak. As stated above, the l temperature controller setpoint adjustment knob will be protected from '

accidsnt41 misadjustment so that future occurrences will be prevented.  !

It you have any questions regarding this report, please cemiset l Mr. Robert A. Gwinn at (603) 474-9574, extension 4056. t Very truly yours, 4

ofo%

George S. Thomas i

i L 1

I cc: Regional Administrator l

a USNRC P.agion 1 475 Allendale Road -

King of Prussia. PA 19405  ;

i i

Mr. D. G. Ruscitto $

! NRC Senior Resident Inspector (Acting) l Sea *orook Station '

1 Seabrook, NH 03874

! INPO -

1 Records Crater I 1100 Circle 75 Parkway  ;

g Atlanta, GA 30339 l

! l i

i  ?

r 4

i 1

i i

f r - .- - - _ . - - - - . - - - - - -.

I