ML19263C053

LER 78-126/03L-0 on 781230:during Startup of Component Cooling Water Pump,Heat Exchanger 1-1 Svc Water Outlet Valve SW-1424 Would Not Open Due to Slippage & Misalignment of Valve Linkage;Led to Continuous Valve Oscillation

ML19263C053
Person / Time
Site:	Davis Besse
Issue date:	01/26/1979
From:	Deakyne K TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19263C050	List: ML19263C049 ML19263C053
References
LER-78-126-03L, LER-78-126-3L, NUDOCS 7902020210
Download: ML19263C053 (3)

Text

U.S. NUCLE AR REGULATORY COMMISSION NRC FORM 366 (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l lh 6

(PLEASE PRINT OR TYPE ALL REQUIRED INFORM % TION) jo l1l l 0l H D B l Sl 1l@l0 l0 l- l0 l0LICENSE lN lP F l- l0 l3 25@l4 26 l1LICENSE l1 l1TYPE l130@l57 l UAT$8 l@

7 8 9 LICENSEE CODE 14 15 NUYSEH CON'T o 1 [CRT g lLl@l0l5l0 - l0 l3 l4 l6 @l112 68 63 l3EVENT l017 D ATE 18 ,1@l011121617191@

74 75 REPORT DATE 80 7 8 60 61 DOCKET NUYSER EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 lDuring the startup of the Component Cooling Water (CCIO Pump 1-1 on 12/30/78. the ener4 o a lator noticed that the CCW Heat Exchanger 1-1 Service Water Outlet Valve SW-1424 would I o 4 inot open. The standby CCW Pump (1-3) was placed in service to replace CCW Pump and i

9 5 [ Heat Txchanger 1-1. No cause for the improper operation was found, and CCW Pump and I o a Heat Exchanger 1-1 was returned to service. On 12/31/78. it was noticed that valve 1 o 7 ISW-1424 would not maintain temnerature oroperiv. The stamibv CCW 1000 was available. I l

o a lThe reactor was not critical. (NP-33-7 8-147 )

CAUSE COYP. VALVE SYSTEM CAUSE SUBCODE SUBCODE COMPONENT CODE SUBCODE CODE CODE o 9 lW l Al@ Wh l Blh lV l A l L I V l 0 lP lh lD lh (Dj h 12 33 18 19 2G 7 8 9 10 Ii REVISION S E QUE P4 T I A L oCCURaEP.CE REPORT REPORT NO. CODE TYPE No.

EVENT YE AR b RE,P LER HO su g RT

_ 21 (7l8l 22

(___j 23

[1 l2 l 6 l 24 26 W

27 l0 l3 23 29 l Ll 30 l-31 l0l 32 HOURS S B iT D FOR? b u. S PPLIE MAP F CT RER T KE ACTC O PLA T ETH

[E lgl34Z lg l33Z lg l36 2]@

l0l0l0l0l 3/ 40 l41Y ]@ lYl@

42 lAl@ lh 43 44 0 l 3 l 547l@

33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l Slippage and misalignment of the valve linkage caused the actuator to function in- [

jijij [ correctly. This led to continuous oscillation of the valve. On 1/2/79, the valve l The valve was then placed in service and is j

, , , , y g linkage was adjusted and calibrated.

l

,,,,, l being monitored for proper performance.

l 1 4 I 80 7 8 3 OTH ER STATUS DSO RY DISCOVERY DESCRIPTION ST S  % POWER NA NA l i s Lol@ 10101018 "

l l* A l@(* a

' ' S " "

A Ti o fy CderENT AVOUNT OF ACTIVITY LOCATION OF RELEASE RELE ASED OF RELE ASE l lNA l l i 168 i9LZ J @ to

_ LZ_ 1@l 1t u^ 44 45 80 PERSONNEL E kPOSURES NU*.tBE R TYPE DESCRIPTION l

LLL7J 10 10 10 l@l Zl@l NA PERSONNE L INJURIES NUV8ER DESCRIPTION l1 lK l l0 l0 f0 l l NA 80 7 8 9 11 12 LOSS OF CH DAYAGE TO FACILITY TYPE CESChiPTICN I

Ii l o f IZ_j@l NA 80 y 8 9 10 e

2 o mUIN ~lr n@ l NAD ESC nip TION I IIII1lIIIli DVR 78-193

" 9 7902 0 2 0 2 to KOU DOOkYOO PHONE. 419-259-5000. Ext.^230 {

y,.,,E 05 Pn E P AH E R

j TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-78-147 DATE OF EVENT: December 30, 1978 FACILITY: Davis-Besse Unit 1 TDENTIFICAT10N OF OCCURRENCE: Component Cooling Water Heat Exchanger Service Water Outlet Valve operating improperly.

The unit was in Mode 3, with Power (MWT) = 0, and Conditions Prior to Occurrence:  !

Load (Gross MWE) = 0.

Cooling Description of Occurrence: On December 30, 1978 at 2242 the hours, Component operator noticed that Water (CCW) Pump 1-1 was started. During the startup, open. CCW the CCW Heat Exchanger 1-1 Service Water Outlet ValveThis SW-1424 would not placed the unit in the Pump 1-2 "was started and CCW Pump 1-1 was stopped. Action Statement o The standby CCW loop (1-3) was lined loops while the unit is in Modes 1 through 4. '

up and placed in service to replace CCW Loop 1-1. This removed the unit from the Action Statement of Technical Specification 3.7.3.1.

Instrument and Control personnel investigated the problem under Maintenance Work After satisfactor-Order 1C-114-79. No cause for the improper operation was found.

ily operating valve SW-1424 both manually and automatically, it was returned to service.

On December 31, 1978, it was noticed that valve SW-1424 would not maintain tempera-ture properly.

The valve would have opened if a safety injection had accurred, therefore the loop was not declared inoperable. The cause of occurrences was dis-covered during the corrective action taken af ter the December 31 incident.

The improper operation of valve SW-1424 Designation of Apparent Cause of Occurrence:

was attributed to a possible design deficiency in the slippage and misalignment of It is believed the valve linkage. This led to continuous oscillation of the valve.

the vibration of the actuator linkage loosens the nut retaining the two linkage arms.

There was no danger to the health and safety of the public Analysis of Occurrence: The reactor was not or to unit personnel. The standby CCW loop was available.

critical.

79-1206, the Corrective Action: On January 2, 1979, under Maintenance Work Order valve linkage was adjusted and calibrated. The valve was then placed in service and is being monitored for proper performance.

LER #78-126

a TOLEDO EDISON COMPNTY  :

DAVIS-BESSE !?UCLEAR POWER STATION UNIT ONE PAGE 2 SUPPLEMENTAL INFORMATION FOR LER NP-33-78-147 In order to prevent recurrence of misalignment of valve linkage, a Facility Change Request will be submitted which will request the linkage be modified to prevent vibration from loosening the nut.

Failure Data: There have been two previously reported occurrences of actuator inoperabilities of a Service Water valve. The inoperabilities reported in Licen-see Event Report (LER) NP-33-78-120 were caused by a nut missing on the actuator and LER NP-33-78-11 was caused by a failure of a solenoid valve.

LER #78-126 4

4 4