Palo Verde experienced a similar issue last year during our fall refueling outage while lifting the reactor head for placement on the head stand. The lift was done with improper alignment which resulted in the head rubbing against the guide pins (OE 35094, 34668). This required inspections and repair of the guide pins and Reactor head.
As far as radiological controls, we included misting installed equipment to keep high contamination from going airborne, maintenance used an electronic scraper to minimize the potential for airborne activity, we set up a tented area with HEPA filtration on the exhaust to perform repairs and we performed decontamination before surface destruction activities were permitted. Initial survey of the guide pins were 300,000-1,500,000 dpm/100cm2. Post decontamination surveys were less than or equal to 1000 dpm/100cm2. Our RWP contained a hold point to perform a TEDE ALARA evaluation before de-burring activities. >From a Lessons learned perspective, this was an emergent first time evolution >and RP participated (including Radiological Engineering) in the planning via >an Issue Response Team (IRT). This allowed us to address contamination and >dose concerns in the early planning phases instead of at the job site. If you would like more detailed information please contact me directly. [cid:[email protected]] Kenneth Walter RP Technical Advisor, Radiological Engineering P.O. Box 52034, Tonopah, AZ 85354, M.S. 7663 Tel 623 393 5482 Fax 623 393 6640 [email protected]<mailto:[email protected]> From: [email protected] [mailto:[email protected]] On Behalf Of BJ Thompson Sent: Tuesday, April 10, 2012 2:10 PM To: [email protected] Subject: Powernet: Underwater EDM on Primary Components (Quick Benchmark) We are preparing to inspect and possible repair a bent alignment pin on our Upper Internals package. Is there any OE you would like to share on contamination controls, airborne radioactivity, high activity particle generation, etc. Thanks for your fast feedback! Barbara J. Thompson Supervisor of Exposure Control Dominion - North Anna Power Station Email: [email protected]<mailto:[email protected]> Phone: 540-894-2605 Beeper: #3469 FAX: 540-894-2408 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. --- 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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