ML102590218
| ML102590218 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 09/16/2010 |
| From: | Office of Nuclear Reactor Regulation |
| To: | Division of License Renewal |
| References | |
| Download: ML102590218 (3) | |
Text
1 DiabloCanyonNPEm Resource From:
Ferrer, Nathaniel Sent:
Thursday, September 16, 2010 10:21 AM To:
Grebel, Terence; Soenen, Philippe R Cc:
DiabloCanyonNPEm Resource
Subject:
Draft RAI Set 27 - Aging Management Review Attachments:
Draft RAI Set 27 AMR.doc Terry and Philippe, Attached is Draft RAI Set 27 containing draft RAIs, specifically on portions of aging management review.
Please review the attached draft RAIs and let me know if and when you would like to have a teleconference call. The purpose of the call will be to obtain clarification on the staff's request.
Please let me know if you have any questions.
NathanielFerrer ProjectManager DivisionofLicenseRenewal OfficeofNuclearReactorRegulation U.S.NuclearRegulatoryCommission (301)4151045
Hearing Identifier:
DiabloCanyon_LicenseRenewal_NonPublic Email Number:
1236 Mail Envelope Properties (26E42474DB238C408C94990815A02F090BDA58990C)
Subject:
Draft RAI Set 27 - Aging Management Review Sent Date:
9/16/2010 10:20:48 AM Received Date:
9/16/2010 10:20:51 AM From:
Ferrer, Nathaniel Created By:
Nathaniel.Ferrer@nrc.gov Recipients:
"DiabloCanyonNPEm Resource" <DiabloCanyonNPEm.Resource@nrc.gov>
Tracking Status: None "Grebel, Terence" <TLG1@PGE.COM>
Tracking Status: None "Soenen, Philippe R" <PNS3@PGE.COM>
Tracking Status: None Post Office:
HQCLSTR01.nrc.gov Files Size Date & Time MESSAGE 565 9/16/2010 10:20:51 AM Draft RAI Set 27 AMR.doc 63482 Options Priority:
Standard Return Notification:
No Reply Requested:
No Sensitivity:
Normal Expiration Date:
Recipients Received:
Diablo Canyon Nuclear Power Plant, Units 1 and 2 (DCPP)
License Renewal Application (LRA)
Draft Request for Additional Information Set 27 Aging Management Review D-RAI 3.3.2.3.3-1 For the following LRA Tables and line items, no aging effect and no AMP is proposed when the components external surface are exposed to indoor air:
LRA Table Component Material 3.3.2-3 Pipe, Valves, Strainers, Filters PVC 3.3.2-3 Pump Fiberglass reinforced plastic 3.3.2-14 Pump PVC 3.3.2-18 Flow indicator, demineralizer Plexiglas 3.4.2-1 Pipe PVC 3.4.2-5 Tanks Plexiglas 3.4.2-2 Tanks Lexan Non-metallic components constructed of materials such as PVC, Lexan, and Plexiglass and fiberglass reinforced plastic exposed to the air-indoor (external) environment are susceptible to aging due to exposure to radiation, ozone or ultraviolet light and/or other degrading effects (e.g.
high temperatures, corrosive/harmful vapors or chemicals, etc.)
Clarify why radiation, ozone, and/or ultraviolet light levels, and/or other degrading effects in the vicinity of the above components would not lead to (or contribute to) aging effects during the period of extended operation.
D-RAI 3.3.2.3.12-1 In LRA Table 3.3.2-12, Fire Protection, and Table 3.5.2-14, Containments, Structures and Component Supports, the applicant stated that for PVC pipe and conduit exposed to soil (external) there are no aging effects thus no AMP is proposed.
The staff understands that buried PVC pipe and conduit can be damaged by exposure to backfill that contains large or sharp material during both installation and operation. The staff also understands that damage to PVC buried pipe and conduit during installation is not an aging management issue; however, during operation, large or sharp objects a short distance away can migrate to the outside surface of the pipe or conduit due to ground movement caused by normal seasonal changes or movement of heavy loads above the buried pipe. Once in contact with the exterior surface of the pipe, this movement can cause wear to the material.
Request:
- 1. Provide historical data on the quality of the backfill used in the vicinity of buried PVC pipe and conduit that would support the conclusion that aging will not occur due to large or sharp material contained in the backfill.
- 2. For the buried PVC conduit, clarify whether the cable enclosed in the conduit is designed for direct burial.