ML102520278

RAI Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Scoping and Screening

ML102520278
Person / Time
Site:	Diablo Canyon
Issue date:	09/17/2010
From:	Ferrer N License Renewal Projects Branch 2
To:	Conway J Pacific Gas & Electric Co
Nate Ferrer, DLR/RPB2 415-1045
References
TAC ME2896, TAC ME2897
Download: ML102520278 (5)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 September 17, 2010 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

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) - SCOPING AND SCREENING

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 (NRC or 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 additional 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.

Sincerely,

/~

Nathaniel Ferrer, Project Manager Projects Branch 2 Division of License Renewal Office of Nuclear Reactor Regulation Docket Nos. 50-275 and 50-323

Enclosure:

As stated cc w/encl: Distribution via Listserv

Diablo Canyon Nuclear Power Plant, Units 1 and 2 License Renewal Application Request for Additional Information Set 26 Scoping and Screening - Clarification on Responses Based on the staff's review of Pacific Gas and Electric Company's (PG&E's) responses dated July 7 and July 19, 2010, and as discussed in telephone conferences held on August 12 and August 18, 2010, please provide responses to the following:

RAI 2.1-1 (follow-up)

In license renewal application (LRA) Section 2.1.2.2, the applicant stated that the scoping methodology for nonsafety-related structures, and components (SCs) with spatial interaction with safety-related structures, systems and components (SSCs) was, "Nonsafety-related systems and components that contain fluid or steam, and are located inside structures that contain safety-related SSCs are included in scope for potential spatial interaction under criterion Title 10 of the Code of Federal Regulation (10 CFR) 54.4(a)(2)."

During plant walkdown, the staff observed inside the turbine building area, there were nonsafety-related fluid-fi"ed SCs that were not included in the scope of license renewal located near safety-related SCs, Control Room Pressurization System (CRPS), in scope under 10 CFR 54.4(a)(1). Therefore, in accordance with the applicant's methodology stated above in LRA Section 2.1.2.2, all fluid-fi"ed SCs in the turbine building area should have been included in the scope of license renewal.

By letter dated May 24,2010, the staff issued RAI2.1-1, requesting the applicant provide a review of nonsafety-related SSCs located in the turbine building, which have the potential to spatially interact with safety-related SSCs.

By letter dated June 18, 2010, the applicant provided additional SSCs to the scope of license renewal. However, the applicant did not provide an evaluation of nonsafety-related SCs with the potential to adversely interact with SCs in scope under 10 CFR 54.4(a)(1) inside the turbine building, specifically CRPS components.

The staff requests that the applicant justify the exclusion of nonsafety-related fluid-filled components in the turbine building, in accordance with the methodology as stated in the LRA Section 2.1.2.2, from the scope of license renewal in areas containing SCs in scope under 10 CFR 54.4(a)(1), specifically including an evaluation of the CRPS system.

RAI 2.1-2 (follow-up)

By letter dated June 18,2010, the applicant responded to RAI 2.1-2 and amended the LRA by including a sma" segment for the extraction steam piping in scope for (a)(2) on LRA drawing LR-DCPP-05-107705-04 at location 45-E. In addition, the applicant include two segments of service water piping into scope of license renewal, denoted on LRA drawing LR-DCPP-15 107715-05, as inside the diesel generator room. However, the piping and components between ENCLOSURE

-2 these two segments were not included in the scope of license renewal. Based upon the information provided, the staff cannot determine if the spatial interaction boundaries were appropriate.

Therefore, the staff requests the applicant provide an evaluation of the spatial interaction boundaries of the abovementioned extraction steam and service water piping that were included in scope of licensing renewal.

RAI 2.1-2 (follow-up)

By letter dated July 28, 2010, the applicant provided an evaluation of high energy piping in the turbine building that should be included in the scope of license renewal to protect safety-related cable in the turbine building from the effects of pipe whip and jet impingement.

However, the staff made the following observations of the scoping of the high energy lines in the turbine building:

• On LRA drawing LR-DCPP-02-106702-15, the applicant depicts high energy lines in scope for 10 CFR 54.4(a)(2), but several tanks are not highlighted, to indicate they are within the scope of license renewal under 10 CFR 54.4(a)(2), in which the high energy lines go through.

• On LRA drawing LR-DCPP-02-106702-13, the applicant depicts high energy lines in scope for 10 CFR 54.4(a)(2), but air blowers and tanks are not highlighted, to indicate they are within the scope of license renewal under 10 CFR 54.4(a)(2), in which the high energy lines go through.

• On LRA drawing LR-DCPP-02-106702-18, the applicant depicts high energy lines in scope for 10 CFR 54.4(a)(2), but pumps and tanks are not highlighted to indicate they are within the scope of license renewal under 10 CFR 54.4(a)(2), in which the high energy lines go through.

• On LRA drawings LR-DCPP-02-106702-12 and LR-DCPP-02-107702-12 at location 125-C, SCs are shown not highlighted in scope for 10 CFR 54.4(a)(2) heading into the continuation flqg. However, on LRA drawings LR-DCPP-02-106702-13 and LR-DCPP 02-107702-13 at location 130-E, the SCs are shown higtllighted in scope for 10 CFR 54.4(a)(2).

The staff requests that the applicant justify its exclusion of the above fluid-filled non safety-related SCs in the turbine building.

'.. MI 102520278 OFFICE LA:DLR PM:RPB2:DLR BC:RPB2:DLR PM:RPB2:DLR NAME IKing NFerrer DWrona NFerrer DATE 9/13/10 09/13/10 09/17110 09/17110

Letter to John Conway from Nathaniel Ferrer dated September 17, 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) - SCOPING AND SCREENING DISTRIBUTION:

HARDCOPY:

DLR RF E-MAIL:

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