ML090090135

PINGP Lr - FW: ML0831103001.doc

ML090090135
Person / Time
Site:	Prairie Island
Issue date:	11/07/2008
From:	Office of Nuclear Reactor Regulation
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Download: ML090090135 (3)

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1 PrairieIslandNPEm Resource From:

Richard Plasse Sent:

Friday, November 07, 2008 10:39 AM To:

Eckholt, Gene F.

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ML0831103001.doc draft RAIs

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11/7/2008 10:39:00 AM From:

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"Eckholt, Gene F." <Gene.Eckholt@xenuclear.com>

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ENCLOSURE November 5, 2008 REQUEST FOR ADDITIONAL INFORMATION BORAFLEX NEUTRON ABSORBING MATERIAL IN SPENT FUEL POOL RACKS AND THE PROTECTIVE COATINGS PROGRAM PRAIRIE ISLAND NUCLEAR GENERATING PLANT UNITS 1 AND 2 DOCKET NUMBERS 50-282 AND 50-306 3.3.2.2.6 Reduction of Neutron-Absorbing Capacity and Loss of Material due to General Corrosion Prairie Island Nuclear Generating Plant (PINGP) Units 1 and 2 have Boraflex that they no longer credit for criticality in their spent fuel pools. There is no indication whether or not they still monitor the Boraflex for degradation. Past operating experience indicates that there can be blistering and bulging of the Boraflex material and the cladding surrounding the material. This can cause potential fuel handling safety issues.

1. Although Boraflex is not credited for criticality in the PINGP Unit 1 and 2 spent fuel pools, degradation of the material may impede safe handling of the spent fuel if blistering and/or bulging of the rack occurs. How will potential degradation of Boraflex material be identified and monitored during the proposed period of extended operation? If degradation of Boraflex is identified, what mitigation strategies will be employed?

XI.S8 Protective Coating Monitoring and Maintenance Program This program in the licensees application is not credited for aging management. In the application it states that PINGP does not credit coatings inside containment to assure that the intended functions of coated structures and components are maintained. However, in addition to using the Protective Coating Monitoring and Maintenance Program to ensure the function of coated structures and components, NUREG 1801 states that Proper maintenance of protective coatings inside containment is essential to ensure operability of post-accident safety systems that rely on water recycled through the containment sump/drain system. Although the licensee does not credit the program for aging management, there needs to be adequate assurance that there is proper maintenance of the protective coatings in containment, such that they will not degrade and become a debris source that may challenge the Emergency Core Cooling Systems performance. Therefore the staff requires the following additional information:

2. Please describe in detail the coatings assessment program referenced in the supplemental response to GL 2004-02 (dated February 28, 2008). How will the program ensure that there will be proper maintenance of the protective coatings inside containment and ensure operability of post-accident safety systems that rely on water recycled through the containment sump/drain system in the extended period of operation? Also, describe the frequency and scope of the inspections, acceptance criteria, and the qualification of personnel who perform containment coatings inspections.