ML13281A574

Requests for Additional Information for the Review of the Byron Nuclear Station, Units 1 and 2, and Braidwood Nuclear Station, Units 1 and 2, License Renewal Application - Aging Management, Set 3 (TAC Nos. MF1879, MF1880, MF1881, and MF1882

ML13281A574
Person / Time
Site:	Byron, Braidwood
Issue date:	11/25/2013
From:	Daily J Division of License Renewal
To:	Gallagher M Exelon Generation Co
John Daily 301-3873
References
TAC MF1879, TAC MF1880, TAC MF1881, TAC MF1882
Download: ML13281A574 (7)

Text

Mr. Michael P. Gallagher UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 November 25, 2013 Vice President, License Renewal Projects Exelon Generation Company, LLC 200 Exelon Way Kennett Square, PA 19348

SUBJECT:

REQUESTS FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE BYRON NUCLEAR STATION, UNITS 1 AND 2, AND BRAIDWOOD NUCLEAR STATION, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION-AGING MANAGEMENT, SET 3 (TAC NOS. MF1879, MF1880, MF1881, AND MF1882)

Dear Mr. Gallagher:

By letter dated May 29, 2013, Exelon Generation Company, LLC, submitted an application pursuant to Title 10 of the Code of Federal Regulations Part 54, to renew operating licenses NPF-37, NPF-66, NPF-72 and NPF-77 for Byron Nuclear Station, Units 1 and 2, and Braidwood Nuclear Station, Units 1 and 2, respectively, for review by the U.S. Nuclear Regulatory Commission 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.

These requests for additional information were discussed with John Hufnagel, 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 301-415-3873 or by e-mail at john.daily@ nrc.gov.

Sincerely,

_ji)L_ ~

John W. Daily, Sr. Project Manager Projects Branch 1 Division of License Renewal Office of Nuclear Reactor Regulation Docket Nos. 50-454, 50-455, 50-456, and 50-457

Enclosure:

As stated cc: Listserv

ML13281A574 OFFICE LA: DLRIRPB2 PM: DLRIRPB1 BC: DLRIRPB1 PM: DLRIRPB1 NAME YEdmonds JDaily YDiaz-Sanabria JDaily DATE 10/29/13 11/5/13 11/20/13 11/25/13

Letter toM. P. Gallagher from John W. Daily dated November 25, 2013

SUBJECT:

REQUESTS FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE BYRON STATION, UNITS 1 AND 2, AND BRAIDWOOD STATION, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION-AGING MANGEMENT, SET 3 (TAC NOS. MF1879, MF1880, MF1881, AND MF1882)

DISTRIBUTION:

E-MAIL:

PUBLIC RidsNrrDir Resource RidsNrrDirRpb1 Resource RidsNrrDirRpb2 Resource RidsNrrDraApla Resource RidsOgcMaiiCenter JDaily LRobinson DMclntyre, OPA JWiebe, DORL EDuncan, Rill JBenjamin, Rill AGarmoe, Rill SRI, Byron Station, Rill JRobbins, Rill VMitlyng, Rill PChandrathil, Rill

BYRON NUCLEAR STATION, UNITS 1 AND 2 AND BRAIDWOOD NUCLEAR STATION, UNITS 1 AND 2 REQUEST FOR ADDITIONAL INFORMATION AGING MANAGEMENT, SET 3 (TAC NOS. MF1879, MF1880, MF1881, AND MF1882)

RAI 2.1.3.4-1, Fire Protection Technical Basis Document Applicability: Byron and Braidwood Stations, all units This RAI has been dropped as agreed to in the conference call of October 22, 2013.

RAI 2.3.3.12-1, Fire Protection Scoping-Screening, components not included, foam maker chamber et al Applicability: Byron and Braidwood This RAI has been dropped as agreed to in the conference call of October 22, 2013.

RAI 2.3.3.12-2, Fire Protection Scoping-Screening, components not included, filter housings et al Applicability: Byron and Braidwood

Background:

For Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2, the staff reviewed the combined LRA, drawings, and several other applicable documents. The staff has identified that certain fire protection systems and components have been excluded from the scope of license renewal and an aging management review (AMR). These systems and components that were not included in the license renewal boundaries appear to have fire protection intended functions required for compliance with Title 10 of the Code of Federal Regulations (CFR) 50.48, "Fire protection," as stated in 10 CFR 54.4.

Issue:

Tables 2.3.3-12 and 3.3.2-12 of the LRA do not include the following fire protection components:

filter housings passive components in the diesel fuel fire pump floor drains for fire water Request:

The staff requests that the applicant verify whether the fire protection components listed above are in the scope of license renewal in accordance with 10 CFR 54.4(a) and whether they are subject to an AMR in accordance with 10 CFR 54.21 (a)(1 ). If they are excluded from the scope of license renewal and are not subject to an AMR, the staff requests that the applicant provide justification for the exclusion.

ENCLOSURE RAI 2.3.3.12-3, Fire Protection Scoping-Screening, Carbon Dioxide (C02) systems not included Applicability: Byron and Braidwood This RAI has been dropped as agreed to in the conference call of October 22, 2013.

RAI 2.1.3.4-1, SATs and SBO recovery boundary-Byron Applicability: Byron

Background:

On Page 8.3-5 of the Byron-Braidwood Stations (BBS) Updated Final Safety Analysis Report (UFSAR), Section 8.3.1.1.2.1, the licensee provided the preferred configurations for both stations' Unit 1 and Unit 2 under normal operating conditions in the following statements: "The 4160-volt ESF bus 141 (241 [for Unit 2]) fed from the 345-kV utility grid through system auxiliary transformer (SAT) 142-1 (242-1) and circuit breaker 1412 (2412)... " and "The 4160-volt ESF bus 142 (242) fed from the 345-kV utility grid through SAT 142-2 (242-2) and circuit breaker 1422 (2422)... " The staff notes that these statements indicate that there are SATs and circuit breakers between the 345-kilo-volts (kV) utility grid and the 4160-volt ESF buses.

Issue:

Figure 2.1-2 in the LRA, Section 2.1.3.4, which depicts the Byron Station Blackout (SBO) recovery boundary, does not show circuit breakers 1412, 1422, 2412, and 2422 between the 345-kV circuit breakers and the 4160-volt ESF buses.

Request:

a. Clarify why circuit breakers 1412, 1422, 2412 and 2422 are not included in Figure 2.1-2.

b. Confirm that all components, including breakers and disconnect switches, between the 345-kV utility grid and the 4160-volt ESF buses that are in the SBO recovery path are within the scope of license renewal.

c. Provide a revised Figure 2.1-2, as applicable, for the Byron SBO recovery boundary including all components in the SBO recovery path that shows a clear distinction between components that are within the scope of license renewal and those that are not.

RAI2.1.3.4-2, 345-kV breakers 6-7,7-13 and SBO boundaries-Byron Applicability: Byron

Background:

On Page 2.1-12 of the LRA, Section 2.1.3.4, the applicant stated that Byron Station 345-kV circuit breakers 5-6, 3-7, 7-10, and 12-13, which define the SBO recovery boundary between the electrical transmission network and the plant electrical distribution system and equipment, are within the scope of license renewal. The staff notes that 345-kV circuit breakers 6-7 and 7-13 in Figure 2.1-2 also connect the plant distribution system to the transmission lines.

Issue:

The applicant did not include 345-kV circuit breakers 6-7 and 7-13 in Figure 2.1-2 within the scope of license renewal.

Request:

Clarify whether 345-kV circuit breakers 6-7 and 7-13 are within the scope of license renewal.

RAI 2.1.3.4-3, SATs and SBO recovery boundary-Braidwood Applicability: Braidwood

Background:

On Page 8.3-5 of the BBS Updated Final Safety Analysis Report (UFSAR), Section 8.3.1.1.2.1, the licensee provided the preferred configuration for Unit 1 (Unit 2) under normal operating conditions in the following statements: "The 4160-volt ESF bus 141 (241) fed from the 345-kV utility grid through system auxiliary transformer (SAT) 142-1 (242-1) and circuit breaker 1412 (2412)... " and "The 4160-volt ESF bus 142 (242) fed from the 345-kV utility grid through SAT 142-2 (2422) and circuit breaker 1422 (2422)... " The staff notes that these statements indicate that there are SATs and circuit breakers between the 345-kV utility grid and the 4160-volt ESF buses.

Issue:

Figure 2.1-3 in the LRA, Section 2.1.3.4, which depicts the Braidwood Station Blackout (SBO) recovery boundary, does not show circuit breakers 1412, 1422, 2412, and 2422 between the 345-kV circuit breakers and the 4160-volt ESF buses.

Request:

a. Clarify why circuit breakers 1412, 1422, 2412, and 2422 are not included in Figure 2.1-3.

b. Confirm that all components, including breakers and disconnect switches, between the 345-kV utility grid and the 4160-volt ESF buses that are in the SBO recovery path are within the scope of license renewal.

c.

Provide a revised Figure 2.1-3, as applicable, for the Braidwood SBO recovery boundary including all components in the SBO recovery path that shows a clear distinction between components that are within the scope of license renewal and those that are not.

RAI2.1.3.4-4, 345 kV breakers 1-3,9-15, and SBO boundaries-Braidwood Applicability: Braidwood

Background:

On Page 2.1-12 of the LRA, Section 2.1.3.4, the applicant stated that Braidwood Station 345-kV circuit breakers 3-4, 4-7, 11-14, and 14-15, which define the SBO recovery boundary between the electrical transmission network and the plant electrical distribution system and equipment:

are within the scope of license renewal. The staff notes that 345-kV circuit breakers 1-3 and 9-15 in Figure 2.1-3 also connect the plant distribution system to the transmission lines.

Issue:

The applicant did not include 345-kV circuit breakers 1-3 and 9-15 in Figure 2.1-3 within the scope of license renewal.

Request:

Clarify whether the 345-kV circuit breakers 1-3 and 9-15 are within the scope of license renewal.

RAI2.5.2.1-1, Electrical components subject to AMR and pressure boundaries Applicability: Byron and Braidwood

Background:

On Page 2.5-2 of the LRA, Section 2.5.2.1, the applicant included elements, resistance temperature detectors (RTDs), sensors, thermocouples, and transducers in the list of electrical components and commodities for in-scope systems. However, NEI 95-10, "Industry Guideline for Implementing the Requirements of 10 CFR Part 54-The License Renewal Rule," Appendix B, Item 84 indicates that elements, RTDs, sensors, thermocouples and transducers should be included in the list of components/commodity groups subject to an AMR if a pressure boundary is applicable.

Issue:

The applicant did not include these components in the components commodity groups subject to an AMR.

Request:

Clarify whether a pressure boundary is applicable to each of these components and whether they are subjected to an AMR.