Palo Verde requests information on the following: Situation: Initiation of shutdown cooling to remove decay heat from the reactor coolant system causes in-service portions of the system to experience evaluated dose rates. Prior to hydrogen peroxide addition, we post and lock these areas as LHRA. Access is not allowed until sufficient clean up / dose rate reduction is achieved, typically within 3-5 days.
Question: have any of you developed a "correlation" between RCS concentrations and general area radiation levels that you reliably use as a basis to commence surveying and down posting activities associated with these types of high radiation areas? If yes, is this value used in your outage schedule as a decision point to perform post shutdown posting change surveys? If you do have a pre-determined concentration, do you have a basis for this value? Thank you in advance for your response. Kenneth Walter RP Technical Advisor, Radiological Engineering P.O. Box 52034, Tonopah, AZ 85354, M.S. 7663 Tel 623 393 5482 Pager 877 503 8549 Fax 623 393 6640 [email protected]<mailto:[email protected]> --- NOTICE --- This message is for the designated recipient only and may contain confidential, privileged or proprietary information. If you have received it in error, please notify the sender immediately and delete the original and any copy or printout. Unintended recipients are prohibited from making any other use of this e-mail. Although we have taken reasonable precautions to ensure no viruses are present in this e-mail, we accept no liability for any loss or damage arising from the use of this e-mail or attachments, or for any delay or errors or omissions in the contents which result from e-mail transmission.
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