siemens - Public Service Commission

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CR3 Allov 600 PWSCC Mltiaation Proiecf
Pressurizer and Sume Line Modiflcations 1
Description C. X. A. and E Proposal Section
Project Description
IntroductionlProject Background:
Crystal River Unit 3 will be undertaking a series of component replacement and reinforcement activities
during the 15th refueling outage (RFO15) currently scheduled for late 2007. These activities are
intended to reduce the risk of Alloy 600/82/182 Primary Water Stress Corrosion Cracking (PWSCC)
associated with the Pressurizer and Surge Line. When complete, all susceptible componentdregions
in the Pressurizer and Surge Line will have been replaced, reinforced or will have been reconfigured
such that no Alloy 600/82/182 will be performing a Reactor Coolant Pressure Boundary function.
The Bidder is requested to submit a comprehensive proposal based on the requirements contained
herein and on the previous experience of the Bidder with similar proposals and/or projects. The Bidder
is requested to bid the scope of work described to optimize the overall Alloy 600 Mitigatlon program for
Prooress Enerav.
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1 I Evaluation (NDE). and demobilization activities associateiwith the modification of the following I I I
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components:
Pressurizer Relief Valve Butt Welds (total of 3)
Pressurizer Spray Line Extension Pin and Safe End
Pressurizer Vent Nozzle
Pressurizer Sample Tap Nozzle
Pressurizer Lower Level Tap Nozzles (total of 3)
Pressurizer Thermowell
Pressurizer Surge Line Nozzle Butt Weld
Hot Leg Surge Line Nozzle Butt Weld
The Relief Valve Butt Welds are to be modified by removing the existing Alloy 82/182 welds and
flanges and replaclng with equivalent flanges attached with Alloy 52/152 welds.
The bidder may propose a weld inlay technique for these locations.
The Sorav line Extension Pin and Safe End and attachment welds are to be replaced with Allov 690
components attached with Alloy 52/152 welds.
The Vent, Sample Tap, and Lower Level Tap Nozzles are to be modified using a half-node
replacement methodology employing Alloy 690 components attached with Alloy 521 52 welds.
The preferred half-nozzle replacement methodology is to use a mid-wall weld as opposed to an
external weld build-up and attachment weld. The proposal may contain either methodology at the
Bidder's discretion.
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'C (Conforml -The Bidder meets the requirement in the manner indicated.
X /ExMDL~o~~ - An approach which does not meet the requirements or a requirement the Bidder declines to meet.
A @h"q) - An approach which is substantially different kom the suggested approach but whldr meets the slated requirements.
E (Enhancement) -An element not required by the Requirements Documents but offered for consideration.
PEF-NCR-00778