L-15-120, Notification of Completion of License Renewal Commitments Related to the Review of the Davis-Besse Nuclear Power Station, Unit No. 1, License Renewal Application and License Renewal Application Amendment No. 55

Notification of Completion of License Renewal Commitments Related to the Review of the Davis-Besse Nuclear Power Station, Unit No. 1, License Renewal Application and License Renewal Application Amendment No. 55

ML15098A443
Person / Time
Site:	Davis Besse
Issue date:	04/08/2015
From:	Lieb R FirstEnergy Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-15-120, TAC ME4640
Download: ML15098A443 (9)

Text

FENOC' ~

5501 North State Route 2 Oak Harbor, Ohio 43449 FirstEnergy Nuclear Operating Company Raymond A. Lieb 419-321-7676 Vice President, Nuclear Fax: 419-321-7582 April 8, 2015 L-15-120 10 CFR 54 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

SUBJECT:

Davis-Besse Nuclear Power Station, Unit No. 1 Docket No. 50-346, License Number NPF-3 Notification of Completion of License Renewal Commitments Related to the Review of the Davis-Besse Nuclear Power Station, Unit No. 1, License Renewal Application (TAC No. ME4640) and License Renewal Application Amendment No. 55 By letter dated August 27, 2010 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML102450565), FirstEnergy Nuclear Operating Company (FENOC) submitted an application pursuant to Title 10 of the Code of Federal Regulations, Part 54 for renewal of Operating License NPF-3 for the Davis-Besse Nuclear Power Station, Unit No. 1 (Davis-Besse). As described in the Safety Evaluation Report Related to the License Renewal of Davis-Besse Nuclear Power Station (ML13248A267), FENOC provided license renewal Commitments 26 and 37 to perform core bores in structural concrete to identify whether the introduction of water into the concrete had adversely impacted the concrete or reinforcing steel.

The actions described in license renewal Commitment 26 have been completed. The actions described in license renewal Commitment 37, Phase 1, have also been completed. The License Renewal Application is revised accordingly.

The Attachment provides the details regarding the closure of the License Renewal Commitments. The Enclosure provides Amendment No. 55 to the Davis-Besse LRA.

Davis-Besse Nuclear Power Station, Unit No. 1 L-15-120 Page 2 There are no regulatory commitments contained in this letter. If there are any questions or if additional information is required, please contact Mr. Clifford I. Custer, Fleet License Renewal Project Manager, at 724-682-7139.

I declare 1,mder penalty of perjury that the foregoing is true and correct. Executed on April gy<._, 2015.

Sincerely, I~ 1a{!/

~L\eb

Attachment:

Details Regarding Closure of Commitments in the Davis-Besse Nuclear Power Station, Unit No. 1 (Davis-Besse), License Renewal Application (LRA),

Appendix A, Table A-1

Enclosure:

Amendment No. 55 to the Davis-Besse License Renewal Application cc: NRC DLR Project Manager NRC Region Ill Administrator cc: w/o Attachment or Enclosure NRC DLR Director NRR DORL Project Manager NRC Resident Inspector Utility Radiological Safety Board

Attachment L-15-120 Details Regarding Closure of Commitments in the Davis-Besse Nuclear Power Station, Unit No. 1 (Davis-Besse),

License Renewal Application (LRA),

Appendix A, Table A-1 Page 1of3

1. LRA Commitment 26 (Aggressive Groundwater ln-Leakage)-Closure License renewal Commitment 26 currently reads:

Obtain and evaluate for degradation a concrete core bore from two representative inaccessible concrete components of an in-scope structure subjected to aggressive groundwater prior to entering the period of extended operation. Based on the results of the initial core bore sample, evaluate the need for collection and evaluation of representative concrete core bore samples at additional locations that may be identified during the period of extended operation as having aggressive groundwater infiltration. Select additional core bore sample locations based on the duration of observed aggressive groundwater infiltration.

Document identified concrete or steel degradation in the FENOC Corrective Action Program.

In December 2014, as required by License Renewal Commitment 26, FENOC completed concrete sampling and laboratory testing of two representative core samples obtained from areas exposed to long-term aggressive groundwater intrusion (i.e., from the floor in Room 105 (ECCS Pump Room No. 1) and the wall in Room 246 (East Condenser Pit Area)). To ensure the effect of groundwater intrusion on structural reinforcing steel was understood, FENOC also obtained and examined two representative core bore samples from the same locations that exposed a section of reinforcing bar (rebar).

A concrete testing laboratory assessed the condition of the concrete and steel by visual examination, and by petrographic examination and compressive strength testing of the concrete samples. The core segments were judged to be in good condition, the paste bond to the aggregate was tight, and there was no indication of physical degradation resulting from groundwater intrusion. No evidence of alkali-aggregate reaction was observed in the concrete samples. Compressive strength testing of the core samples showed values above design values. There was no appreciable deterioration of the rebar sample, indicating that no significant loss of cross-section had occurred. Where the concrete was in physical contact with the rebar, the surface did not exhibit any appreciable corrosion. The reinforcement imprint surfaces were covered by superficial oxidation product (rust).

FENOC engineering evaluated the laboratory results and determined the results

Attachment L-15-120 Page 2of3 were satisfactory, and that no aging effects were identified that required entry into the FENOC Corrective Action Program.

Based on the positive laboratory testing results of the core samples and rebar examinations, there is no need for collection and evaluation of additional representative concrete core bore samples at other locations where aggressive groundwater infiltration has been observed. Should the amount of groundwater infiltration increase significantly in areas where groundwater intrusion has been identified, or additional future groundwater infiltration locations be identified, the issue will be entered into and evaluated using the FENOC Corrective Action Program.

Therefore, License Renewal Commitment 26 is considered closed. LRA Table A-1, "Davis-Besse License Renewal Commitments," is revised to address closure of license renewal Commitment 26 activities.

2. LRA Commitment 37 (Spent Fuel Pool Leakage through wall [i.e., into ECCS Pump Room No. 1 wall] and floor [i.e., into ceiling of Room 109])-Phase 1 Closure License renewal Commitment 37 currently reads:

Perform and evaluate core bores of the ECCS Pump Room No. 1 wall and the Room 109 ceiling.

• The core bores will be deep enough to expose reinforcing bar in the wall and ceiling. The core samples from the core bores will be examined for signs of corrosion or chemical effects of boric acid on the concrete or reinforcing bars. The examination will include a petrographic examination. The reinforcing steel that will be exposed for a visual inspection will have corrosion products collected for testing. Degradation identified from the samples will be entered into the FENOC Corrective Action Program. The core bores will be performed in areas where leakage has been observed in the past.

• The first set of core bores will be performed prior to the end of 2014 (Phase 1).

• The second set of core bores will be performed prior to the end of 2020 (Phase 2).

• Further core bores will be conducted, if warranted, based on the evaluation of the results of the inspection and testing of the core bores or if spent fuel pool leakage through the wall or ceiling recurs after the second set of core bores is performed. If spent fuel pool leakage through another wall or ceiling is identified, then core bores

Attachment L-15-120 Page 3 of 3 will be performed in a manner similar to that stated for the EGGS Pump Room No. 1 wall and the Room 109 ceiling.

In December 2014, as required by License Renewal Commitment 37, Phase 1, FENOC completed concrete sampling and laboratory testing of two representative core samples obtained from areas where spent fuel pool leakage has been observed in the past (i.e., from the wall in Room 105 (ECCS Pump Room No. 1),

which is also the wall of the Spent Fuel Pool, and the ceiling in Room 109 (Maintenance Hot Work Area), which is also the floor of the Spent Fuel Pool). To collect potential corrosion products for testing, FENOC also obtained and examined two representative core bore samples from the same locations that exposed a section of reinforcing bar (rebar).

A concrete testing laboratory assessed the condition of the concrete and steel by visual examination, and by petrographic examination and compressive strength testing of the concrete samples. The core samples were judged to be in good condition, the paste bond to the aggregate was tight, and there was no indication of physical degradation resulting from spent fuel pool leakage. No evidence of alkali-aggregate reaction was observed in the concrete samples. Compressive strength testing of the core samples showed values above design values. There was no appreciable deterioration of the rebar sample, indicating that no loss of cross-section had occurred. Where the concrete was in physical contact with the rebar, the surface did not exhibit any appreciable corrosion. The reinforcement imprint surfaces were covered by superficial oxidation product (rust). No boron was detected in the samples. FENOC engineering evaluated the laboratory results and determined the results were satisfactory, and that no aging effects were identified that required entry into the FENOC Corrective Action Program.

LRA Table A-1, "Davis-Besse License Renewal Commitments," is revised to address partial closure of license renewal Commitment 37, specifically, Phase 1 activities.

See the Enclosure to this letter for the revision to the Davis-Besse LRA.

Enclosure Davis-Besse Nuclear Power Station, Unit No. 1 (Davis-Besse)

Letter L-15-120 Amendment No. 55 to the Davis-Besse License Renewal Application Page 1 of 4 License Renewal Application Sections Affected Table A-1 The Enclosure identifies the change to the License Renewal Application (LRA) by Affected LRA Section, LRA Page No., and Affected Paragraph and Sentence. The count for the affected paragraph, sentence, bullet, etc. starts at the beginning of the affected Section or at the top of the affected page, as appropriate. Below each section the reason for the change is identified, and the sentence affected is printed in italics with deleted text lined out and added text underlined.

Enclosure L-15-120 Page 2 of 4 Affected LRA Section LRA Page No. Affected Paragraph and Sentence Table A-1 Page A-69 Commitments 26 & 37 Implementation Schedules The actions required by license renewal Commitment 26, and Commitment 37, Phase 1, have been completed, and LRA Table A-1, "Davis-Besse License Renewal Commitments," is revised to update the "Implementation Schedule" for these two commitments, as follows:

Table A-1 Davis-Besse License Renewal Commitments Related LRA Item Implementation Commitment Source Section No./

Number Schedule Comments 26 Obtain and evaluate for degradation a concrete core bore from two fl.Ff.er- te FENOC Responses to representative inaccessible concrete components of an in-scope December- 31, Letters NRC RAls structure subjected to aggressive groundwater prior to entering the -2()4-4 L-11-153, B.2.39-3 from period of extended operation. Based on the results of the initial core L-11-237, NRC Letter COMPLETE bore sample, evaluate the need for collection and evaluation of aRfi dated representative concrete core bore samples at additional locations L-11-292 April 5, 2011, that may be identified during the period of extended operation as and 8.2.39-11 from having aggressive groundwater infiltration. Select additional core L-15-120 NRC Letter bore sample locations based on the duration of observed dated aggressive groundwater infiltration. Document identified concrete or July21,2011, steel degradation in the FENOC Corrective Action Program.

and Supplemental RAI 8.2.39-11 from telecon

Enclosure L-15-120 Page 3 of 4 Table A-1 Davis-Besse License Renewal Commitments Related LRA Item Implementation Commitment Source Section No./

Number Schedule Comments held with the NRC on September 13, 2011 37 Perform and evaluate core bores of the ECCS Pump Room No. 1 Phase 1 FE NOC Responses to wall and the Room 109 ceiling. prior to Letters NRC RAI Qeeemee.r- 31, L-11-153.L B.2.39-2 from

• The core bores will be deep enough to expose reinforcing bar in

-2fJ44 aAG NRC Letter the wall and ceiling. The core samples from the core bores will L-11-238 dated be examined for signs of corrosion or chemical effects of boric COMPLETE and April 5, 2011, acid on the concrete or reinforcing bars. The examination will L-15-120 and include a petrographic examination. The reinforcing steel that and RAI B.2.39-10 will be exposed for a visual inspection will have corrosion from products collected for testing. Degradation identified from the NRC Letter samples will be entered into the FENOC Corrective Action Phase 2 prior to dated Program. The core bores will be performed in areas where December 31, July 21, 2011 leakage has been observed in the past. 2020

• The first set of core bores will be performed prior to the end of 2014 (Phase 1).

• The second set of core bores will be performed prior to the end of 2020 (Phase 2).

• Further core bores will be conducted, if warranted, based on the evaluation of the results of the inspection and testing of the core bores or if spent fuel pool leakage through the wall or ceiling

Enclosure L-15-120 Page 4 of 4 Table A-1 Davis-Besse License Renewal Commitments Related LRA Item Implementation Commitment Source Section No./

Number Schedule Comments recurs after the second set of core bores is performed. If spent fuel pool leakage through another wall or ceiling is identified, then core bores will be performed in a manner similar to that stated for the ECCS Pump Room No. 1 wall and the Room 109 ceiling.