Phil,
The Rev W was referenced in CAR 7375 as the "anticipated" fixed Rev (drive
current upped from 250 microA to 750 microA). I have no idea what our
installed rev is.
Thanks,
Gaylon
----------
From: Burness, Phil[SMTP:[EMAIL PROTECTED]]
Sent: Tuesday, May 22, 2001 12:05 PM
To: 'Foxboro DCS Mail List'
Subject: RE: FBM03 Drift Characteristics
Rev W? my memory must be slipping :-)). Any idea on the date of the
CAR? My
guess is you have pre Rev W. If you can pull one have a look at the
Rev.
Phil
-----Original Message-----
From: Hicks, Gaylon F. [mailto:[EMAIL PROTECTED]]
Sent: 22 May 2001 17:53
To: 'Foxboro DCS Mail List'
Subject: RE: FBM03 Drift Characteristics
I'm not sure what revision, but they are 1995 vintage. I found I/A
CAR 7375
which addresses this drift issue, supposedly fixed at revision "W".
I'm not
sure. It looks like I will end up taking a precision decade box up
and
checking the FBMs.
I appreciate the help on this.
Thanks,
Gaylon
----------
From: Burness, Phil[SMTP:[EMAIL PROTECTED]]
Sent: Tuesday, May 22, 2001 11:42 AM
To: 'Foxboro DCS Mail List'
Subject: RE: FBM03 Drift Characteristics
Any idea what revision of FBM03's you are using? There is a
fix in
modules
(Rev J & above I think) that corrects for thermal drift.
Phil
-----Original Message-----
From: Hicks, Gaylon F. [mailto:[EMAIL PROTECTED]]
Sent: 22 May 2001 17:03
To: 'Foxboro DCS Mail List'
Subject: FBM03 Drift Characteristics
I'm conducting an informal survey in lieu of talking to TAC.
I
would
appreciate and pertinent information anyone can share.
First, a little background. Browns Ferry uses Feedwater
line
temperatures
as an input to our core thermal power calculation during
normal
operation
(it's basically an enthalpy balance calc), and we operate
based on
our
licensed thermal power limits, so we get whatever electrical
MWs
output
based on this amount of steam, river temperature, etc.. If
this
number is
inaccurate, we can lose electrical output, and we appear to
be
missing about
9 MW electric at the moment. Our Feedwater line temperature
is
measured by
two four-wire precision 100 ohm platinum RTDs on each of two
Feedwater lines
with a EXTBLK connection to a CHARC block. We use lab data
RTD
specific
curves for each AIN block (we really, really want this to be
accurate), and
have these four inputs split between two FBM03s on the same
CP. We
normally
operate with a FW temperature of about 380 degrees F.
Over the last year all four RTD measurements have trended
downward
about 1
degree F, which would account for about 2 MW electrical. I
have
been tasked
with contacting the vendor (Foxboro) to ask if there is any
known
failure
mode or mechanism that would cause these four RTDs on two
separate
FBM03s to
trend downward. I though I would try the list first to
solicit
opinions.
No derogatory comments please. I have already expressed my
opinion
on this
subject, but I don't want to bias anyone.
Again, your patience and any input is appreciated.
Thanks,
==================================================
Gaylon Hicks
Tennessee Valley Authority, Browns Ferry Nuclear Plant
Mail Stop PEC-2C
PO Box 2000
Decatur, AL 35609
Phone: (256) 729-7804 Fax: (256) 729-2047
email: [EMAIL PROTECTED]
FedEx Address: Shaw Road, Athens, AL 35611
==================================================
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