05000316/LER-1980-014-03, /03L-0:on 800216,during Surveillance Test, Proximity Switch for D Main Turbine Stop Valve Fell Off Mounting Bracket.Caused by Threads in Mounting Bracket Being Stripped.Hole Retapped to Larger Size

/03L-0:on 800216,during Surveillance Test, Proximity Switch for D Main Turbine Stop Valve Fell Off Mounting Bracket.Caused by Threads in Mounting Bracket Being Stripped.Hole Retapped to Larger Size

ML17326A643
Person / Time
Site:	Cook
Issue date:	04/02/1980
From:	Rischling J INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17326A637	List: 05000316/LER-1980-013-03, /03L-0:on 800307,during Normal Operation,Circuit Breaker for R-11 & R-12 Sample Pump Tripped.Caused by Failure of Rubber Spider in Lovejoy L-100 Coupling.Complete Coupling Replaced & Air Sampler Tested 05000316/LER-1980-014-03, /03L-0:on 800216,during Surveillance Test, Proximity Switch for D Main Turbine Stop Valve Fell Off Mounting Bracket.Caused by Threads in Mounting Bracket Being Stripped.Hole Retapped to Larger Size ML17326A636
References
LER-80-014-03L, LER-80-14-3L, NUDOCS 8004080545
Download: ML17326A643 (2)

LER-1980-014, /03L-0:on 800216,during Surveillance Test, Proximity Switch for D Main Turbine Stop Valve Fell Off Mounting Bracket.Caused by Threads in Mounting Bracket Being Stripped.Hole Retapped to Larger Size

Event date:
Report date:
3161980014R03 - NRC Website

text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION I7.77)

A,

~

lCENSEE EVENT REPORT

~

CONTROL BLOCK:

QI

{PLEASE PRINT OR TYPE ALI.REQUIRED INFORMATION) 6 N

I 0

C C

2Q2 0

0 0

0 0

0 0

0 0

0 0

Q3 4

I 1

1 1 Q4~ps 7

8 9

LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE 30 57 CAT 58 CON'T

~oi

"'" ~LQB 5,0 0

0 3

1 6Q7 0

2 1

6 8

0 Qs 0

4 0

2 8

0 Qg DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES +10 DURING A SURVEILLANCE TEST i THE PRORIMITY SWITCH FOR D

MAIN TURBINE STOP

~03

~04

~OB

~O7

~OS 7

8 VALVE FELL OFF OF THE MOUNTING BRACKET.

THIS PROXIMITY SWITCH PROVIDES TURBINE STOP VALVE CLOSURE INDICATION,FOR THE REACTOR PROTECTION SYSTEM.'HIS EVENT IS NON-CONSERVATIVE IN RESPECT TO T.S.

TABLE 3.3-1 ITEM 18.b.

THE AFFECTED CHANNEL WAS PLACED IN THE TRIP CONDITION AS REQUIRED.

PREVIOUS OCCURRENCES INCLUDE: 050-316/80-04.

80 zz 7

8 OUT.

THE HOLE WAS RE74PLPED TO A LARGER SIZE AND NEW BOLTS WERE INSTALLED. THE PROXIMITY SWITCH WAS THEN RETURNED TO SERVICE.

THE MOUNTING BRACKETS FOR THE SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

~IA Q~EQi2

~BQ>>

I N

S T

R U

Q4

~IO>>

L~J 06 9

10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION 21 22 23 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP.

COMPONENT L~JOl8~~0>>

L~JO20 L302

'~I'I0>>

MO"

~~025 1I lI I(

~

02.

33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS +27 o

INVESTIGATION REVEALED THAT THE THREADS IN THE MOUNTING BRACKET WERE STRIPPED 3

OTHER PROXIMITY SWITCHES WERE ALSO CHECKED, NO ADDITIONAL PROBLEMS WERE DISCOVERED.

THIS EVENT WAS DETERMINED TO BE REPORTABLE ON MARCH 2$,"1980.

80 CEl ACTIVITY CONTENT RELEQED OF RELEASE AMOUtQF ACTIVITYQ36

's

~P>>

O>>

7 8

9 10 44 PERSONNEL EXPOSURES

~(I""'ll'"0 (@~Y'O'"'"'"III("

7 II8 9

11 12 13 PERSONNEL INJURIES 7

8 9

11 12 LOSS OF OR DAMAGETO FACILITY 43 7

8 9

10 PUBLICITY ISSUED DESCRIPTION~

NA 8

9 10 80 LOCATIONOF RELEASE Q36 45 80 80 80 g ~OVD8'oS95 80 NRC USE ONI Y o

80 o

0L 68 69 616-465-5901 PHONE:

J.

L. RISCHLING NAME OF PREPARER 7

8 9

FACILITY kp>>~P50O29 I

~>>B>>(~j,SURVEILLANCE TEST 8

9 10 12 13 44 45 46

t A t;

l

()