ML090090135
| ML090090135 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 11/07/2008 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| Download: ML090090135 (3) | |
Text
1 PrairieIslandNPEm Resource From: Richard Plasse Sent: Friday, November 07, 2008 10:39 AM To: Eckholt, Gene F.
Subject:
FW: ML0831103001.doc Attachments:
ML0831103001.doc draft RAIs
Hearing Identifier: Prairie_Island_NonPublic Email Number: 266 Mail Envelope Properties (Richard.Plasse@nrc.gov20081107103900)
Subject:
FW: ML0831103001.doc Sent Date: 11/7/2008 10:39:11 AM Received Date: 11/7/2008 10:39:00 AM From: Richard Plasse Created By: Richard.Plasse@nrc.gov Recipients: "Eckholt, Gene F." <Gene.Eckholt@xenuclear.com>
Tracking Status: None Post Office: Files Size Date & Time MESSAGE 22 11/7/2008 10:39:00 AM ML0831103001.doc 42606 Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date: Recipients Received:
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 licensee's 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 contai nment 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-acci dent 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.