05000346/LER-1978-085-03, /03X-1:on 780720,containment Vessel post-accident Radiation Monitor Re 5029 Declared Inoperable.Caused by Component Failure.Motor Pulley Replaced & Belt Installed. Surveillance Test Completed

/03X-1:on 780720,containment Vessel post-accident Radiation Monitor Re 5029 Declared Inoperable.Caused by Component Failure.Motor Pulley Replaced & Belt Installed. Surveillance Test Completed

ML20010B493
Person / Time
Site:	Davis Besse
Issue date:	08/04/1981
From:	Schwenning L TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17275B377	List: ML17275B376
References
LER-78-085-03X, LER-78-85-3X, NUDOCS 8108170092
Download: ML20010B493 (2)

LER-1978-085, /03X-1:on 780720,containment Vessel post-accident Radiation Monitor Re 5029 Declared Inoperable.Caused by Component Failure.Motor Pulley Replaced & Belt Installed. Surveillance Test Completed

Event date:
Report date:
3461978085R03 - NRC Website

text

- --

s.,n LICENSEE EVENT REPORT

~

cont Rot stock: l l

l l

i l

l@

(PLE ASE PRINT OR TYPE ALL REQUIRED INFORMATION) lo } i l l 0l H j D l B l S l 1l@, O l 0 l - l 0 l 0 l 0 l 0 l 0 l-l 0 l 0 l@l 4 l 1l 1l 1l 1l@l l

jg 7,

8 9 LICENSEE CODE 14 IS LICENSE NUMclER 25 26 LICENSE TYPE JD 57 CAT b8 CON'T 3 [,,c $l 0 j 5 l 0 l 010 l 3 l 4 l 6 @l 0 l 7 l 2 l8 l 7 l dl@l '0l 8l 014l 8 l 1 l@

o i 8

60 61 DOCKET NUYBER til 69 EVENT DATE 74 75 REPORT DATE 30 EVENT DESCRIPTION AND PROBABLE CONSEQUENtES h o 2 l (NP-33-78-101) On July 28,1978 at 2110 hours0.0244 days <br />0.586 hours <br />0.00349 weeks <br />8.02855e-4 months <br />, Containment Vessel Post Accident l

Radiation Monitor RE 5029 was declared inoperable (the low flow light was found to be !

oa I gol4l l lit). Tl[i's'placed the unit in Act dan Statement (a) of Technical Specification go,3l l 3.3.3.6 which requires the operability of both pos<. accident monitors in Modes 1, 2,

[

l and 3.

There was no danger to t.he health and safety of the public or station personnel;.

o6 j o l 7 ] l The redundant monitor RE 5030 was operable throughout this occurrence.

[

I 10181 I 80 E

CODE SUB O E COMPONENT CODE Sus Do'E St E

l Bl Blh Wh Wh l Il Nl Sl Tl R! Ulh Wh Wh Q

j r;

a 9

10 11 12 13 16 19 20 SEQUENTIAL OCCURRENCE REPORT REV:SION

_ EVENT YEAR R EPORT NO.

CoOE TYPE No.

@,ag/No I7 l8 l l-l l 01 81 si l/l I013l lx l

[---]

y j

LER

_ 21 22 23 24 26 27 28 29 30 31 32 1

x AC N

ONP NT MET,4 HOURS S 6 iT FOR B.

SUPPLI E MANLFACTURER l C Jgl341 [ g [ChZ lg l36 Zl@Ql0l0l0l Q@

W g lAl@

l V l1 l1 l5 l@

31 40 41 42 43 44 47 33 CAUSE DESCRIPT'ON AND CORRECTIVE ACTIONS h The motor pulley was l

y [The cause of this occurrence was found to be component failure.

l replaced and the belt installed. The successful completion of Surveillance Test I

g lST 5099.05 at 2022 hours0.0234 days <br />0.562 hours <br />0.00334 weeks <br />7.69371e-4 months <br /> on August 1, 1978 removed the unit from the action statement.

l I

ttLaj l I

i 4 1

7 8 9 STA S

% POWER OTHER STATUS ISCO Y

DISCOVERY DESCR,PTION

~

j 6@ l 0 l 2 l 0 l@l NA l

] @ l Surveillance Test ST 5099.05

, 3 AfTivtTV CO TENT RELEASED OF RELE A51 AMOUNT OF ACTIVITY LOCATION OF RELEASE l

ITTs1 l Z! @ [_zj@l NA l

l NA PERSONNEL EXPOSL ES oESCRiP1.O~ @

NUM.ER 1v,E 1910l 01@LzJ@l n^

l i >

,ERSONNEl'm;U4ES cESCR,PT,0~@

NuM.E R l

l el el Ol@l NA 80 i a 7

8 9 11 12 LOSS OF CR DAM AGE TO FACILITY TYPE @l DESCRIPTION l

NA 1 9 30 7

8 9 10 e

eSSUED DE CRiPTION l

llllllll!Ill!{

[Tol I NI(Ei)l NA es s9 80.

7.

8108170092 810804 05000 4 Lynn Schwenning PHONE:(419) 259-5000. Ext. 251 g DVR hDRADOCK

F a*

I l

TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFOR'1ATION FOR LER NP-33-78-101 DATE OF OCCURRENCE:

July 28, 1978 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE:

Containment Post Accident Radiation Monitor RE 5029 inoperable.

Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MWT)

= 554, and Load (MWE) = 140.

Description of Occurrence:

On July 28, 1978 at 2110 hours0.0244 days <br />0.586 hours <br />0.00349 weeks <br />8.02855e-4 months <br /> during the performance of Surveillance Test ST 5099.05, " Shift Channel Check of the Radiation Monitoring System", Radiation Monitor RE 5029 was found to have a low flow light. The radiation monitor was declared inoperable by the Shift Supervisor.

Technical Specification 3.3.3.6 requires the operability of both Contain-ment Vessel Post Accident Radiation Monitors in Modes 1, 2 and 3.

Action Statement (a) states that the inoperable channels must be restored to operable status within 30 days.

Designation of Apparent Cause of Occurrence: The cause of the occurrence was component failure. The pump on RE 5029 threw its belt, yielding the low flow alarm.

Analysis of Occurrence: There was no danger to the health and safety of the public or to unit personnel. The other Containment Post-Accident Radiation Monitor, RE 5030, was operable during the period that RE 5029 was inoperable.

Corrective Action

The motor pulley was replaced by Maintenance cer-sonnel under Maintenance Work Order 78-1874.

The pump was then started, and the low flow alarm cleared. The monitor was proven to be operable through performance of Surveillance Test ST 5099.05 at 2022 hours0.0234 days <br />0.562 hours <br />0.00334 weeks <br />7.69371e-4 months <br /> on August 1, 1978. The unit was removed from Action Statement (a) of Tech-I nical Specification 3.3.3.6 at this time.

1 Failure Data: One previous reported occurrence of a pump / pulley com-1 ponent failure was reported in Licensee Event Report NP-33-78-91.

LER (/78-085