Good Afternoon, Attached to this email is a document that contains a Surry OE that was generated by our Corporate personnel regarding source range detector response during Core Onload (Basically, the SRD indication for an elevated count rate would still occur but could be later than expected). If you have not yet read this, please take the time to do so. Once read, please answer the following questions to the best of your ability:
Is your plant aware of this? If so, have you done anything to safeguard against a potential core misloading and/or a boron dilution event?
At Surry Power Station, during cold shutdown a dilution is prevented by closing the demin water valve. Surry will also be taking a look at our historical source range detector response and come up with a lesser 1/M stop criteria during onload. We will also be providing training to Operations and Fuel Handling so that they are aware of this condition.
If you require more information on this OE, please do not hesitate to contact me.
__________________________________________________________ Charlene Chotalal Lead Reactor Engineer Surry Power Station Dominion Generation Work: (757)-365-2819 __________________________________________________________
CONFIDENTIALITY NOTICE: This electronic message contains information which may be legally confidential and or privileged and does not in any case represent a firm ENERGY COMMODITY bid or offer relating thereto which binds the sender without an additional express written confirmation to that effect. The information is intended solely for the individual or entity named above and access by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you.
Charlene, have the calculation results been benchmarked to actual data? If so how well do they agree? A alternate solution would be to bring back a "dunker source range" that can be placed in the core while being loaded to monitor 1/m. They were used during initial core loading (cycle 1) at most plants. It can be tied into existing SR indication to allow remote monitoring. ----- Original Message ----- From: Charlene N Chotalal To: pwrrm@retaqs.com Sent: Wednesday, September 16, 2009 11:59 AM Subject: [Pwrrm] OE29438 Questions
Good Afternoon,
Attached to this email is a document that contains a Surry OE that was generated by our Corporate personnel regarding source range detector response during Core Onload (Basically, the SRD indication for an elevated count rate would still occur but could be later than expected). If you have not yet read this, please take the time to do so. Once read, please answer the following questions to the best of your ability:
Is your plant aware of this? If so, have you done anything to safeguard against a potential core misloading and/or a boron dilution event?
At Surry Power Station, during cold shutdown a dilution is prevented by closing the demin water valve. Surry will also be taking a look at our historical source range detector response and come up with a lesser 1/M stop criteria during onload. We will also be providing training to Operations and Fuel Handling so that they are aware of this condition.
If you require more information on this OE, please do not hesitate to contact me.
__________________________________________________________ Charlene Chotalal Lead Reactor Engineer Surry Power Station Dominion Generation Work: (757)-365-2819
__________________________________________________________
CONFIDENTIALITY NOTICE: This electronic message contains information which may be legally confidential and or privileged and does not in any case represent a firm ENERGY COMMODITY bid or offer relating thereto which binds the sender without an additional express written confirmation to that effect. The information is intended solely for the individual or entity named above and access by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you.
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Hi Ken, Long time no talk to. I believe the calculation results have been benchmarked with real data, but since we haven't had any misloadings or unwanted dilutions, I am hesitant to say that . We have taken a look at source range response as the first 6 assemblies have been loaded into the core. The solution of putting something in the core while loaded might be a solution, but that instrument would need to be tied into the flux monitoring system(we would need to know if we got the high flux at shutdown alarm from it). Then again, what the OE is saying is that the source range detector will work, it just might tell us when we are really close to having a problem. Do you know of any other plants that can relate to this?
__________________________________________________________ Charlene Chotalal Lead Reactor Engineer Surry Power Station Dominion Generation Work: (757)-365-2819 __________________________________________________________
From: pwrrm@retaqs.com [mailto:pwrrm@retaqs.com] On Behalf Of Kenneth R Pike Sent: Monday, September 28, 2009 1:34 PM To: PWR Reactivity Management Subject: Re: [Pwrrm] OE29438 Questions
Charlene, have the calculation results been benchmarked to actual data? If so how well do they agree? A alternate solution would be to bring back a "dunker source range" that can be placed in the core while being loaded to monitor 1/m. They were used during initial core loading (cycle 1) at most plants. It can be tied into existing SR indication to allow remote monitoring. ----- Original Message ----- From: Charlene N Chotalalmailto:charlene.n.chotalal@dom.com To: pwrrm@retaqs.commailto:pwrrm@retaqs.com Sent: Wednesday, September 16, 2009 11:59 AM Subject: [Pwrrm] OE29438 Questions
Good Afternoon, Attached to this email is a document that contains a Surry OE that was generated by our Corporate personnel regarding source range detector response during Core Onload (Basically, the SRD indication for an elevated count rate would still occur but could be later than expected). If you have not yet read this, please take the time to do so. Once read, please answer the following questions to the best of your ability:
Is your plant aware of this? If so, have you done anything to safeguard against a potential core misloading and/or a boron dilution event?
At Surry Power Station, during cold shutdown a dilution is prevented by closing the demin water valve. Surry will also be taking a look at our historical source range detector response and come up with a lesser 1/M stop criteria during onload. We will also be providing training to Operations and Fuel Handling so that they are aware of this condition.
If you require more information on this OE, please do not hesitate to contact me.
__________________________________________________________ Charlene Chotalal Lead Reactor Engineer Surry Power Station Dominion Generation Work: (757)-365-2819 __________________________________________________________
CONFIDENTIALITY NOTICE: This electronic message contains information which may be legally confidential and or privileged and does not in any case represent a firm ENERGY COMMODITY bid or offer relating thereto which binds the sender without an additional express written confirmation to that effect. The information is intended solely for the individual or entity named above and access by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you.
________________________________ _______________________________________________ PWRRM mailing list PWRRM@retaqs.com http://www.keffective.com/mailman/listinfo/pwrrm ________________________________
No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: 270.13.100/2375 - Release Date: 09/16/09 05:51:00