ML20027A375

RO NP-33-77-64 on 770827:reactor Coolant Pump 1-1-2 Tripped Removing One of Two Reactor Coolant Pumps of Loop from Operation.B&C Phase Surge Capacitors Were Discovered to Be Damaged Due to Design Deficiency

ML20027A375
Person / Time
Site:	Davis Besse
Issue date:	09/22/1978
From:	Beeler T, Lingenfelter J TOLEDO EDISON CO.
To:
Shared Package
ML20027A371	List: ML20027A370 ML20027A373 ML20027A374 ML20027A375
References
NUDOCS 7811210382
Download: ML20027A375 (2)

Text

- - . - -

I I 1

LICENSEE EVENT REPORT CoNinot stoCa

.L L.1 I I f_J.

'v.~:e ..--s........ ~we c ,n .~,-

@ 0 (H l DlB l S ilj , l OJ -j 010 l N1 P lF l -l0 l 3) 4l11,1j ll1 }

.....o.v

':.ir.m -

eo . m. ~u... . .N.~. ... ...o.,o...

con'1 l [ 0l3l 0 1 034 1 1 16 l8 f2 17 !71_7 10191 212 17 17 t vtNT 081CasPf eon .

gl Reactor Coolant Pu=p 1-1-2 tripped removing one of the two Reactor j i as so Eles Coolant Pu=ps of the loo; froc operation. Station in Action Statement [

w t.

f 81, of Technical Specificatien 3.4.1. OTP-33-77-641 l

I

>E.L.

8L l

• ITA" c'T! co. n-, ~, c on, 'd.Wr' I.r ,7.~,'u"', .

tw 11 1210 i v....... .

8)

LCJBJ 49 to LBJ la Lit l2 I o 1 TI o 1 RJg1 tsj 43 44 43 LNJ 44 1 CAUM Of5CmartsoN oi [ The B&C phase surge, capacitors were discovered' to be damaged. ' Wes'tinghousq dl*has. determined this is due to a design deficiency. A Facility Change so es g (Request has been prepared which requests modifications be made. ,

m a as

's".'.Tu'5" s .oe . o . .s,.,us ".'dM. ' o.scovea no...rto-8 a o L3J e

l9 I 01.0 ic Tf i3 I I NA .4 I L.Aj s t.4, NA _ __

To f

o.'O.'!Ma . ou,, or .c o .v.1 v socai.o ,e,.ucase 3 8 (J._) , igj l MA 9 to it .4 l l 45 NA 60 I

PtnSoNNEL t zroSU415

[h3lh] .. ..

l

.2 A

}

Ptn50NNEL 48.JUMIE 5

~ a

,. , y3"i' ;, i , i,,"K " ~ i i Of filtf CCN5touf NCts LC55 CR Ca.at.1 to F actLeiv

.... o u . . .. . . .,

l i

hh^ m tv.LeCl T v

@l NA "__ "

j ADDaltONAL 8 ActCRS NNhD b D l'

l 3 ieeNA 3

a) l l

8.1

,o Jacque Lingenfelter/ T. Beeler (419) 259-5000, Ext. 251 DVR 123-1

i TOLEDO EDIS0N COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR TIR NP-33-77-64 t

DATE OF EVENT _: August 27, 1977 j FACILITY: Davis-Besse Unit 1 Reactor Coolant Pump Motor 1-1-2 was declared IDENTIFICATION OF OCCURRENCE:

inoperable on August 27, 1977.

The plant was in Mode 2, with Power (MWT) = 125 i Conditions Prior to Occurrende_:

i and Load (MWE) = 0.

Reactor Coolant Pump Motor 1-1-2 tripped at 1740 hours0.0201 days <br />0.483 hours <br />0.00288 weeks <br />6.6207e-4 months <br /> Description27, of Occurrence 1977, _:with instantaneous ground (50GS) and differential current on August This placed the Station into the relay (87m/A-B-C) targets indicating the fault.

Action Statement of Technical Specification 3.4.1 since one of the two Reactor Coolant Pumps in the loop were not in operation.

Upon inspection of the Reactor d l

Designation of Apparent Cause of Occurrence: Coolant It has been determined Pump 1-1-2 moto by Westing-1 B&C phase surge capacitors to be damaged. house the desian of th J

There was no danger to the health and safety of the Analysis of Occurrence: The thermal power was at a low valus and the i

l

^

public or Station personnel. remaining three Reactor Coolant Pumps were s The high flux and the flux-delta-flux setpoints were reset for i l Specification Corrective Action:

three pump operation as required by the Action Statement of Techn ca 3.4.1.

Station maintenance personnel replaced C-phase surge capacitors and re-installed B-phase surge capacitors after caulking the crack in the porcelain an opening in the seas with RTV silicone sealant.

Reactor Coolant Pump 1-1-2 was declared operable.

At 0058 hours6.712963e-4 days <br />0.0161 hours <br />9.589947e-5 weeks <br />2.2069e-5 months <br /> on August 31, 1977, This removed the station from Action Statemr at of Technical Specification 3.4 an inspection was made on the remaining reactor coolant pump On August 29, 1977, motors.

A defective capacitor was found in A phase for Reactor Coolant Pump A 1-2-2 Station maintenance personnel replaced A phase surge capacitor with a new one.78-470, has been prepared which requests all the RCP Facility Change Request, by Westinghouse.

1 motor capacitors be modified to the new mounting design recommended Failure Data:_ No previous similar events have occurred.

.. . , _ -_- .. - - , - _ -