ML20082N613

RO:analog-capable Safety Channel of Reactor Inoperable During Reactor Operation.Caused by Broken Connection in High Voltage Cable for Neutron Detector.Reactor Shutdown & Secured

ML20082N613
Person / Time
Site:	U.S. Geological Survey
Issue date:	08/30/1991
From:	Kocher C DOW CHEMICAL CO.
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 9109100002
Download: ML20082N613 (1)

Text

" ^

~~~ a61070E i

..v w- rin N:5 iD: tlEN5is-ss05 ~ idL Tdii50F liLtd ~

b2  :

' DOW TRIGA CESEARCH REACTOR  ;

L. ,* .

j r o ,

t  !

" Dirica of NucientRenewReguladon l

US Nos3em Regulatory Comminion WashinguiDC 20$$5

. . -s.' 3 ,

DOW TRIGA RESEARCH REACTOW  %. /

• DOCKE(4274  ;

i

'the analog samm<apable safety channel of the Dow 'IRIO A Rawnrsh Reestor was found to be not l opeasting during opusdon of the reacn. 'nds event is a violadon of the Tw.hrleal Spaincadons, wMme j There shall be a minimum of one scram ckpable analog safety channel (operating when the reactor  ;

is operedng);and ,

There shall be a minimum of two scram capable safety channels operndng wlan tid reactor is CPsenting. ,

l - During this event one independent scram <spable safety channel (digital) wu operating.  :

?

h The rescu was shut down and secured as soon as the malfunctbn wm nodced (during a powmup

w. .

The loss of the safoty c.hannel was caused by a broken connection in the high voltage catic for the neutron deseew.

- A detailed caplanadon will be sent separately. j

/61m .

'- 4 C.W. Kocher r

Reac w s w ervisor l

AnalythalSciences l Dow ChemicalU$A f 1802 Building l

l . niidlandMI 48640

+ ,

1 l i l

l..

ccoozo - = ^- im p .

,, 9109100002 910830 PDR ADOCK 05000274 / y @[]

A }

['

s PDR ,- t.;

t l -- - - _ - -