ML102520264

Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application - Aging Management Review

ML102520264
Person / Time
Site:	Diablo Canyon
Issue date:	09/29/2010
From:	Ferrer N License Renewal Projects Branch 2
To:	Conway J Pacific Gas & Electric Co
Ferrer, N B, NRR/DLR, 415-1045
References
TAC ME2896, TAC ME2897
Download: ML102520264 (5)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 Mr. John Conway Senior Vice President Generation and Chief Nuclear Officer Pacific Gas and Electric Company 77 Beale Street, MC B32 San Francisco, CA 94105 September 29,2010

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE REVIEW OF THE DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION (TAC NOS. ME2896 AND ME2897) - AGING MANAGEMENT REVIEW

Dear Mr. Conway:

By letter dated November 23, 2009, Pacific Gas & Electric Company submitted an application pursuant to Title 10 of the Code of Federal Regulations Part 54, to renew the operating licenses for Diablo Canyon Nuclear Power Plant, Units 1 and 2, for review by the U.S. Nuclear Regulatory Commission (the staff). The staff is reviewing the information contained in the license renewal application and has identified, in the enclosure, areas where additional information is needed to complete the review, The request for additionai information was discussed with Mr. Terry Grebel, and a mutually agreeable date for the response is within 30 days from the date of this letter. If you have any questions, please contact me at 301 -415-1045 or bye-mail at Nathaniel. Ferrer@nrc.gov.

Docket Nos. 50-275 and 50-323

Enclosure:

As stated cc w/enci: Distribution via Listserv Sincerely, Nathaniel Ferrer, Project Manager Projects Branch 2 Division of License Renewal Office of Nuclear Reactor Regulation

D-RAI 3.3.2.3.3-1 Diablo Canyon Nuclear Power Plant, Units 1 and 2 License Renewal Application (LRA)

Request for Additional Information (RAI) Set 27 Aging Management Review For the following license renewal application (LRA) Tables and line items, no aging effect and no aging management program (AMP) is proposed when the components' external surface are exposed to indoor air:

LRA Table Component Material 3.3.2-3 Pipe PVC 3.3.2-3 Pump Fiberglass reinforced plastic 3.3.2-14 Pump PVC 3.3.2-18 Flow indicator, demineralizer Plexiglass 3.4.2-1 Pipe PVC 3.4.2-5 Tanks Plexiglass 3.4.2-2 Tanks Lexan Non-metallic components constructed of materials such as polyvinyl chloride (PVC), lexan, plexiglass, and fiberglass reinforced plastic exposed to an indoor air environment are susceptible to aging due to exposure to radiation, ozone, 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.

ENCLOSURE 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.

• ML102520264 OFFICE LA:RPOB:DLR PM:RPB2:DLR BC:RPB2:DLR PM:RPB2:DLR NAME IKing NFerrer DWrona NFerrer DATE 09/15/10 09/27/10 09/29/10 09/29/10

Letter to John Conway from Nathaniel B. Ferrer dated September 29,2010

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE REVIEW OF THE DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION (TAC NOS. ME2896 AND ME2897) - AGING MANAGEMENT REVIEW DISTRIBUTION:

HARD COPY:

DLR RF E-MAIL:

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