[ RadSafe ] BWR SCRAM sequence

[Tena Galyon]

It should not go critical since it would not be in the correct geometry.


Tena A. Graben-Galyon, CQA
President
Graben Galyon Consultants
4260 Vercelli Lane
Knoxville, TN  37938
Tel 865-922-6087
Cell 865-803-0266
Fax 865-922-6087


-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Doug Aitken
Sent: Thursday, March 17, 2011 10:17 AM
To: 'The International Radiation Protection (Health Physics) Mailing List'
Subject: Re: [ RadSafe ] BWR SCRAM sequence

As a person with only a basic understanding of the workings of these
reactors, any detail will be very welcome.
One question I keep getting is what happens if the rods melt and pool in the
base of the containment. Will the mass of material go critical? 

Regards
Doug

Doug Aitken
QHSE Advisor, Schlumberger D&M Operations Support
Cell Phone: 713-562-8585
(alternate e-mail: doug.aitken at slb.com )
Mail: c/o Therese Wigzell,
Schlumberger,
Drilling & Measurements HQ,
300 Schlumberger Drive, MD15,
Sugar Land, Texas 77478



-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of James Barnes
Sent: Thursday, March 17, 2011 8:30 AM
To: radsafe at health.phys.iit.edu
Subject: [ RadSafe ] BWR SCRAM sequence

Dear all;

Being primarily a PWR HP, I was hoping some of you BWR types might help me
with something.

During a normal SCRAM on a BWR, am I correct in assuming that the steam
generated by the reactor is shunted directly to the turbine condenser so it
can be used as a heat sink?

Can somebody walk me thorugh the sequence of SCRAM to cold shutdown as to
how the various systems are activated and approximately what conditions
trigger those systems?

This is during a "routine" SCRAM (sudden rod insertion) resulting in the
system being taken to cold shutdown.  Not a LOCA or some other type
of outlier event.

Thanks,

James Barnes
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