ML19319B768

RO NP-33-77-37:on 770804,control Room Emergency Ventilation Condensing Units Deliberately Removed from Svc.New Overload Heaters Installed Increasing Condensing Unit Size. Ventilation Sys Returned to Svc on 770804

ML19319B768
Person / Time
Site:	Davis Besse
Issue date:	08/30/1977
From:	George T, Lingenfelter J TOLEDO EDISON CO.
To:
Shared Package
ML19319B668	List: ML19319B667 ML19319B768
References
LER-RO-770830, NUDOCS 8001270236
Download: ML19319B768 (3)

Text

.. .. .. .

• nV LICENSEE EVENT REPORT I

con rnut etecac I,, L j l ! l_j 8 G

f.'a':A' ' t .C c u .,w . a ' 'H ,T ' ',"J ,T 10 l_@ld O! 01 E "ir f -10 ! 31 I4 t lj lll l lj l 013 I

@]3I01111 DIB 1 S 11 7* j I$ J ',

.\,

A 3 N C a s t coa

• L [n'eE*N noC at t Nuwet a tys. ereest stree t c,a t t r,,co,ntsrtj iti t.(LJ @j8j o ! 417;7i 101 8 ;3 1 0 i 7 i7 i

'Tr t0t5 1 0 t .-; O 3 4 1 66ai v, ~ si e,s i. >> ,a E vtNT Of 5CntPYtoM '

g ; Deliberate entry into the Action Statement of Technical Specffication g 7 89 's3 8(3.7.6.1 to replace the overload heaters in the condensin:: units. One at ..c,i e9

[Ej!a time, the Control Room E=erzency Ventilation Units were removed from  !

e4 ea 8.3 lse vice, overload heaters reolaced and the unita raenrn.ad en a a '- f < - I 7 b 's  :-)

@ (within twenty minutes. (!'F-33-77-3 7) .  !

7 89 &aiwt rc I*

[nY e

E diL'" Lj

> cn=coeve N' C o r)s S v ** tem vY[C"vYn'r et voce av eCN /

! F iZ; ZiZ;ZlZjZj (Aj l Z1 Z l ZiZj [NJ s a o so ss s2 na sa << <u <e

. f cAu$r ot:cairtion g [A system revision which increased the size of the condensing units

i es u i g [' necessitated the increase in the overload heaters. j l 7 89 cc

~> 8189 __

. r 7 i a0

^

$ iEIUS s cows g ovest a S ta tus o sc0 av utsCovt nv ot v.nirtione 8

) 5 (JJ ito010t et l43 NA 1 ( AJ [,NA_ j C L2 44 4% d6 E0 e sp.u os ac f ave t e c on t r e. r sof Lt Ast o os ne i tan aucuNs or act evety toCas so.e C.r at LE ASC Ei) i 3 9 tj;j . [Zj to i NA it *4 I l NA 45 j

60 PE 8150NNEL E xPoSuatS esvuus e 1**t OF. 5C e **T'oM

@ 89 7

l010101 LZ1 al 12 1 NA IJ M I

f Pt risoNN E L Ir< JU54815 av v%e n t s. OL SC aset ecN

@ l,_01 DI 01 l NA  !

7 0 4I LJ N of F 5811 CoNSE oV(NCE5 l NA

]

Losi Ort o AwacE 10 F ACILITY s y r'C Ot S C 9 68 t so**

@ bl \o NA o

Ptr8LtCITY

@ .9 l NA --

l

> u ADOlllOas AL f Actorts

@ .l.NA 1 .i u) s F, F11

,, 3 ---- __. _ g'

,,, Jacque Line,cnfelter/ Tom George (419)~259-5000, Ext. 231 8001xyu23C 7 _ _ _ _ . - _ _ _ - . _ ._. .

i i

TOLEDO EDISON CCMPANY '

Q DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR IER NP-33-77-37 l

DATE OF EVENT: August 4, 1977 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Deliberate entry into the Actic7 Statement of Technical Specification 3.7.6.1. Removal of the Control Room Emergency Ventilation Condensing Un cs trem service, one at a ti=e.

Conditions Prior to Occurrence: The plant was in Mode 3, with Power (MWT) = 0, and Load OS~E) = 0.

Descriction of Occurrence: At 0940 hours0.0109 days <br />0.261 hours <br />0.00155 weeks <br />3.5767e-4 months <br /> on August 4, 1977, one control Room Emergency Ventilation System Condensing Unit at a ti=e was taken out of service to install new overload heaters. The inoperability of these condensing units caused the Control Roon Emergency Ventilation System Trains 1 and 2 to be inoperable, one at a time. This action caused the Station to enter the A -ion Statement of Technical Specification 3.7.6.1.

I d

Designatfor mf Aeparent Cause of Occurrence: The condensing units were taken out of service to install new overload heaters. The new overload heaters replaced the originals which did not mee. the new system requirements becauce at a system revision which increased the size of the condensing units.

Ana:ysis of Occurrence: There was no threat to the health and safety of the public or to station personnel. One Control Room Emergency Ventilation System Train was operable at all ti=es.

Corrective Action: Both Control Room Emercancy_ Ventilation System Trains had the new overload heaters installed. Both Control Room Emergency Ventilation Systems were run, tested and declared operable at 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br /> on August 4, 1977.

This removed the Station from the Action Statement at Technical Specification 3.7.6.1. The overload heaters have now been replaced; therefore, the cause of this occurrence is not expected to become repetitive.

Failure Data: No previous similar events have occurred.

h s_ -

) ,

, =

v