Catawba Nuclear Station just utilized Hydro-Nuts on our 1A Reactor Coolant pump impeller replacement project and are currently looking at installing this same system for tensioning the Reactor Vessel Head.
Eddie Benfield Radiation Protection Scientist [email protected]<mailto:[email protected]> Catawba Nuclear Station Telephone: 803.701.3810 Duke Energy FAX: 803.701.3555 From: [email protected] [mailto:[email protected]] On Behalf Of Shatara, Anne M Sent: Wednesday, October 19, 2011 9:54 PM To: '[email protected]' Subject: RE: Powernet: Hydro nuts ? I can confirm, Diablo has them on both Excess Letdown Heat Exchangers. The NOVA / Curtis Wright nuts are similar in function to the ones used on the reactor heads most are more familar with but can be used in smaller applications. Anne Shatara Performance Improvement Supervisor Diablo Canyon Power Plant | [email protected]<mailto:[email protected]> ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Wednesday, October 19, 2011 8:16 AM To: [email protected] Subject: RE: Powernet: Hydro nuts ? Mark, Braidwood has installed these on all 3 of the pressurizer safety relief valves on both units, which cut dose from 350 mrem/valve to150 mrem/valve. Braidwood also install the hydraulic nuts on the excess letdown heat exchanger (leaked for a decade and several attempts made but failed until hydraulic nuts eliminated leak 5 years ago). We got the idea for safety relief valves from BWR (Dresden) and ELDH from PWR (Diablo Canyon). There are two companies that sell product. We used NOVA, which is now Curtis Wright; because they were ANSI certified which eliminated engineering analysis as we only had to do engineering parts evaluation. So far VC Summer has used on Rx Head and we are still evaluating their experiences. Curtis Wright contacts: Steve Greenwell; [email protected]<mailto:[email protected]> Anthony Schmidt: [email protected]<mailto:[email protected]> Harry L Miller Exelon Nuclear Braidwood Station 815-417-2713 [email protected] ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Wednesday, October 19, 2011 9:09 AM To: powernet Subject: Re: Powernet: Hydro nuts ? Pwr reactor head closure nuts with individual hydraulics. Instead of moving from nut to nut with a tensioner you just hook the hydronuts up, press the button and stand back. Short version. Best Mark Lewis (Via Blackberry) ________________________________ From: hespringer Sent: 10/19/2011 08:44 AM AST To: <[email protected]> Subject: Powernet: Hydro nuts ? In INPO IER L2 on "Inadequate Radiation Exposure Performance" , they include the question: Assess the use of hydro-nuts on large components; much easier to remove. Does anyone know what these are ? Is anyone using them, if so what application ? Thank You ---------------------------------------------------------------- This e-mail message and all attachments transmitted with it from the Nuclear Generation Group of American Electric Power are for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. ************************************************** This e-mail and any of its attachments may contain Exelon Corporation proprietary information, which is privileged, confidential, or subject to copyright belonging to the Exelon Corporation family of Companies. This e-mail is intended solely for the use of the individual or entity to which it is addressed. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution, copying, or action taken in relation to the contents of and attachments to this e-mail is strictly prohibited and may be unlawful. If you have received this e-mail in error, please notify the sender immediately and permanently delete the original and any copy of this e-mail and any printout. Thank You. **************************************************
