05000346/LER-1980-012-03, /03L-1:on 800201,reactor Operator Noticed Control Room Position Indication Was Lost for Letdown Cooler Isolation Valve MU2A.Caused by Const Personnel Bumping Into Disconnect Switch Breaker.Switch Repositioned

/03L-1:on 800201,reactor Operator Noticed Control Room Position Indication Was Lost for Letdown Cooler Isolation Valve MU2A.Caused by Const Personnel Bumping Into Disconnect Switch Breaker.Switch Repositioned

ML19332A560
Person / Time
Site:	Davis Besse
Issue date:	02/28/1980
From:	Stotz J TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19332A555	List:
References
LER-80-012-03L, LER-80-12-3L, NUDOCS 8009160399
Download: ML19332A560 (3)

LER-1980-012, /03L-1:on 800201,reactor Operator Noticed Control Room Position Indication Was Lost for Letdown Cooler Isolation Valve MU2A.Caused by Const Personnel Bumping Into Disconnect Switch Breaker.Switch Repositioned

Event date:
Report date:
3461980012R03 - NRC Website

text

.7-7 7 )

U. S. NUCLt AH HE GUL A10HY CO?.17.EION LICENSEE EVENT REPORT coNinol cL;,ce.- l l

l l

l l

i@

(PLFASE PRINT oR TYPE ALL REQUlHED INFORMATION) f5]Il l 0 l H l D l B l S l 1 l@l 0 l 0 l-l 0 l 0 l N l P l F l-l0 l3 l@l4 l1 l1 l1 l1 l@[

l lg 5 >

Lice %tt COJE 14 15 LICE N5E NU'J6E H 25 20 LICENSE TYRE JJ S7 LAT L3 cwt p j,l l L l@l 0 l 5 l 0 l - l 0 l 3 l 4 l 6 lg0 l 2 l 0 l1 l 8 l0 lgl 0 l 2 l 2 l 8 l 8 l 0 j@

3 4

60 4,1 DOCKET NL?.'3 E a 6d trJ EVENT DATC 74 75 REPOR T D ATE b)

EVENT DESCRl* TION AND PROOABLE CONSECUENCES h go;2; [ 0n 2/1/80 at 1222 hours0.0141 days <br />0.339 hours <br />0.00202 weeks <br />4.64971e-4 months <br />, a reactor operator noticed that he had lost control room posi; 3,3, jtion indication for letdown cooler isolation valve MU2A.

A check of the disconnect g

[ 9,4 ; l switch breaker showed the switch midpositioned between the normal and local position.

[ 3,,, ; [This meant that the valve could not be actuated from the control room or on a Safety q l Features Actuation level 2 initiation.

This placed the unit in the action statement of g

l ;;}[T.S. 3.6.3.1.

There was no danger to the health and safety of the public or station g

g ; personnel. The redundant isolation valve MU3 was operable.

(NP-33-80-16) 7 69 SYSTEM

CAUSE

cAUSE COVP.

VALVE CODE CODE SUDCO;E CCMPONENT CODE SueCODE SUBCOD i3191 Ic Ic l@ l A l@ [Ej@ l C l K l T l B [ R l K [Q ]g g @E 7

8 9

10 11 12 13 18 19 20 SEQUENTI AL OCCURRENCE REFOHT REVISION gg e, 7 3 EVENT YE A ff REFORT NO.

CODE TYPE O.

l O.?y.jg l 8; 0l

[._ l l 0; 1; 2l l-l l0l3l lL l g

y

_41 22 23 24 26 21 28 29 30 31 32 3

ACT O

'L AP T T b NOURS 22 S 6 1 F0F 1 B.

OU PLIE PJ AP.' F T ER

'X lSl^ l@

Izl@

I z l@

10 10 1 0V I l Yl@

lYl@

IA i@

Ic l0 3 I

8l0lg 33_

24 J5 36 3/

40 41 42 43 44 47 cAUSE DESCRIPTION ANo CORRECTIVE ACTIONS h

!.1o))The cause was construction personnel error. Apparently someone bumped into the disconnect g [ switch breaker which is located in a heavily traveled hallway.

Operators reported cong g.,,; [ tractors working above the breaker during this time making for more congestion. The l'i?ll switch was immediately repositioned and indication returned to the control room.

A l

g 4; ; memo was issued to station personnel.

FCs77-234 Supplement 2 has been completed.

e a N5 g

T

. PC.v2R oTHER S TA TU3 Di Co BY

{ 3 l [E l@ l 1 l 0 l 0 l@l NA l

l A l@l operator observation l

DISCOVEHY DESCHIPTioN i3 A C Tivi T Y CO TENT CELE ASEO 08 AELEASE AMOUNT oF ACTIVITY

. Ic l LZj @ LZJ@l NA l

[

NA LOCATION oF RELE ASE l

a 9 13 ti 44 45 PERSONNEL EXPO 5URES SO M./'.*B E R TYPE DESCRIP TION u.DJ l Oi 01 Ol@LZJ@l NA l

IER50NNEL tN/URIES

.j,;[f[I"'0lgl T dbd e

b l

? 9 11 12 LOSS O' OR D AY AGE TO FACILITY 60 TYPE O E JC N a TION il A

l s

'J

'd

"'EmPnON h 8009160 % f M

,3 ;u mitfCSI NA "F

i liiiiiiiiiirl I

G3 69

% E DG S0-021. NAVE Of PREPAF1 Eft Jan C. Stotz 419-259-5000, Ext. 243 g

PHONE:

TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-80-16 i

DATE OF EVENT: February 1, 1980 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Disconnect switch for letdown cooler isolativn valve

.'W2A found out of position Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWT) = 2764, and Load (Gross MWE) = 922.

Description of Occurrence: On February 1,1980 at 1222 hours0.0141 days <br />0.339 hours <br />0.00202 weeks <br />4.64971e-4 months <br />, a reactor operator noticed that he-had lost control room position indication for MU2A, which also meant that he could not operate it from the control room. An equipment operator was dis-patched to the disconnect switch breaker. He found,the disconnect switch in the mid-position between normal (operable from control room)'and the local position.

This meant that the valve would not have actuated to its safety position upon a Safety Features Actuation System (SFAS) level 2 initiation. The disconnect switch was immediately returned to the normal remote position. Technical Specification 3.6.3.1 requires this containment isolation valve to be operable with an isolation time of less than 15 seconds while in Modes 1, 2, 3, and 4.

Therefore, the unit had temporarily entered the action statement which required the inoperable valve be res-tored to operable status within four hours or be in at least hot standby within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in cold shutdown within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />, Designation of Apparent Cause of Occurrence: This occurrence can be attributed to a construction personnel error.

Someone apparently bumped into this switch and did j

not realize it was now out of position.

The breaker is located in a heavily traveled s

hallway on the 585' level outside the #2 mechanical penetration room. Operators reported there had been outside contractors working above the breaker during this time, which made the hallway even more congested.

It is possible that someone brushed up i!

against the switch handle'while stepping around the scaffolding.

Analysis of Occurrence: There was no danger to t'ne health and safety of the public or to station personnel.

Its redundant isolation valve MU3 was operable.

. Corrective Action:

On February 1, 1980, at 1226 hours0.0142 days <br />0.341 hours <br />0.00203 weeks <br />4.66493e-4 months <br />, an equipment operator re-turned the disconnect switch to its normal remote position. This restored control room indication.of the valve position..This removed the unit from the action state-cent of Technical Specification 3.6.3.1.

A meno has been issued to all station _ personnel to emphasize the Dnportance of

- these switches and the need to report to the control room any accidental contact with Ja. breaker or any plant equipment,-even if it appears that nothing has been affected.

LER #80-012

TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-80-16 PAGE 2 Facility Change Request 77-234 supplement 2 has been issued to remove the handles from the switches as a temporary correction until the switches can be replaced.

This workhas been completed.

Failute Data: Previous equipment inoperabilities due to disconnect switches being out of the local position were reported in Licensee Event Reports NP-33-77-38 and NP-33-77-45.

LER #80-012 I

i I

k-