San Onofre Unit 2 is preparing to heat
up from cold shutdown and reach Normal Operating Temperature and Pressure
but stay non-critical to perform system and new component testing. Upon
cooling back down to Mode 5, we can either add hydrogen peroxide for a
crud burst or not (the Pressurizer manway cover will be removed afterward).
Since the unit has been shutdown for ~10 months, the question was
raised - what is the benefit of a crud burst when the RCS Co-58 activity
is currently about two orders of magnitude below typical shutdown values.
Does anyone out there have any experience,
either pro or con, with a decision on crud bursts after an extended shutdown?
We perceive some long-term benefit for Co-60 reduction but assume
that is not very quantifiable. Minimal work will be performed in
containment during the current outage following NOP/NOT testing. The
major benefit in source term reduction would be in decreased dose rates
during the next outage period.
Please reply to me by Thursday, October
18 if possible.
Thanks, Eric
Eric M. Goldin, CHP
Southern California Edison
<[email protected]>
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