RS-14-111, Supplemental Response to NRC Request for Information Pursuant to 10CFR 50.54(f) Regarding the Flooding Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident

Supplemental Response to NRC Request for Information Pursuant to 10CFR 50.54(f) Regarding the Flooding Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident

ML14155A382
Person / Time
Site:	LaSalle
Issue date:	06/04/2014
From:	Kaegi G Exelon Generation Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RS-14-111
Download: ML14155A382 (5)

Text

Exe Gene tio 10 CFR 50.54(f)

RS-14-111 June 4, 2014 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11555 Rockville Pike Rockville, MD 20852 LaSalle County Station, Unit 1 Facility Operating License No. NPF-11 NRC Docket No. 50-373

Subject:

Supplemental Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Flooding Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident

References:

1. Exelon Generation Company, LLC 180-day Response to NRC Request for Information Pursuant to 10 CFR 50.54(f) Regarding the Flooding Aspects of Recommendation 2.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident, dated November 27, 2012 (RS-12-164)

2. NRC Letter, Request for Information Pursuant to Title 1O of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident, dated March 12, 2012 In Reference 1, Exelon Generation Company, LLC (EGC) provided the LaSalle County Station, Units 1 and 2 flooding walkdown report in accordance with the NRC Request for Information (Reference 2). The LaSalle County Station, Units 1 and 2 flooding walkdown report documented the plant walkdowns performed to verify that plant features credited in the current licensing basis for protection and mitigation from external flood events are available, functional, and properly maintained. In Table No. 5 of Reference 1, EGC provided the list of the seventeen (17) LaSalle County Station, Unit 1 plant features that were not able to be inspected due to restricted access. EGC committed to complete the inspection of the Unit 1 features classified as restricted access by the end of the LaSalle County Station, Unit 1 Refueling Outage L1 R15 (Spring 2014). These inspections have been completed.

U.S. Nuclear Regulatory Commission Supplemental Response to 50.54(f) Letter NTTF Recommendation 2.3: Flooding June 4, 2014 Page 2 This letter provides the results of the completed supplemental walkdown inspections performed for the seventeen (17) LaSalle County Station Unit 1 features, classified as restricted access in Reference 1 . The enclosed tables document the walkdown results for each of the subject plant features.

The results of the visual inspections during the supplemental flooding walkdowns for Unit 1 showed that fifteen (15) features meet the NEI 12-07 acceptance criteria. Table 1 provides the results for the features that were inspected during the L 1R15 Unit 1 refueling outage that were immediately judged as acceptable.

Table 2 provides the list of two (2) features that were not immediately judged as acceptable during the supplemental walkdowns, but after processing of the CAP entries, these features were found to be in accordance with the site current licensing basis. The table provides the references to the CAP entries of the identified conditions.

There were no features found to be deficient per the current licensing basis.

The supplemental flooding walkdown record forms document the details of all observations for all flood features inspected, and are available for on-site review. Except as noted above, LaSalle County Station Unit 1 flood protection features met the NEI 12-07 Supplemental Guidance acceptance criteria. After processing of the CAP entries, all features were found to be in accordance with the site current licensing basis. This report completes Commitment No. 1 contained in Reference 1.

This letter contains no new regulatory commitments.

Should you have any questions concerning the content of this letter, please contact Ron Gaston at (630) 657-3359.

I declare under penalty of perjury that the foregoing is true and correct. Executed on the 4th day of June 2014.

Respectfully, G~giT~

Director - Licensing & Regulatory Affairs Exelon Generation Company, LLC

U.S. Nuclear Regulatory Commission Supplemental Response to 50.54(f) Letter NTTF Recommendation 2.3: Flooding June 4, 2014 Page 3

Enclosures:

1. Table 1 - LaSalle County Station, Unit 1 Supplemental List of Features Immediately Judged as Acceptable (Restricted Access Features Inspected During Outage L1 R15)

2. Table 2 - LaSalle County Station, Unit 1 Supplemental List of Features Not Immediately Judged as Acceptable (Restricted Access Features Inspected During Outage L 1R15) cc: Director, Office of Nuclear Reactor Regulation Regional Administrator - NRC Region Ill NRC Senior Resident Inspector - LaSalle County Station NRC Project Manager, NRR - LaSalle County Station Illinois Emergency Management Agency - Division of Nuclear Safety

U.S. Nuclear Regulatory Commission Supplemental Response to 50.54(f) Letter NTTF Recommendation 2.3: Flooding June 4, 2014 ENCLOSURE 1 Table 1 - LaSalle County Station, Unit 1 Supplemental List of Features Immediately Judged as Acceptable (Restricted Access Features Inspected During Outage L 1 R15)

Table #1: Inspected Flooding Features Meeting Acceptance Criteria Features Immediately Judged as Acceptable

1. Feature ID# Description Passive/Active Incorporated/Temporary 1 Off Gas Pipe 3 Penetration Passive Incorporated 2 Off Gas Pipe 4 Penetration Passive - Incorporated 3 Off-Gas Filter Building row AA.5 to AD and column 11 to Passive - Incorporated Basement Floor Slab 1 12.S 4 Off-Gas Filter Building AD-line from 11to12.5 and 11- Passive Incorporated Upper Basement Wall line from AB to AD 2 1 5 Unit 1 Turbine Building column 5 to 11 and S to V. Passive - Incorporated Basement Floor Slab 2 -

Condenser Pit 6 Unit 1 Turbine Building S-line from 5 to 8.9, 5-line from S.5 Passive - Incorporated Upper Basement Wall 2 to U.5, and R-line from 8 to 9 and (Upper Condenser Pit) 8-line from R to S (El. 704.5')

and HP Heater room 7 Unit 1 Auxiliary Building 8.9-line from N to S (El. 687 1 ) Passive - Incorporated Upper Basement Wall -

Steam Tunnel 8 Unit 1 Heater Bay Upper Y-line from 7 to 11 Passive - Incorporated Basement Exterior Wall (HDT Room) 9 OB-73 Penetration Passive - Incorporated 10 OB-74 Penetration Passive - Incorporated 11 OB-81 Penetration Passive - Incorporated 12 OB-156 Penetration Passive - Incorporated 13 OB-169 Penetration Passive - Incorporated 14 lTB-271 Penetration Passive - Incorporated 15 lTB-516 Penetration Passive Incorporated

U.S. Nuclear Regulatory Commission Supplemental Response to 50.54(f) Letter NTTF Recommendation 2.3: Flooding June 4, 2014 ENCLOSURE 2 Table 2: LaSalle County Station, Unit 1 Supplemental List of Features Not Immediately Judged as Acceptable (Restricted Access Features Inspected During Outage L 1R15)

Table #2: Inspected Features Not Immediately Judged as Acceptable Flood Features Not Meeting Acceptance Criteria, Not Designated as Deficient Through CAP

1. Feature ID# Description Observation Component Resolution Operability 1 Off-Gas Filter Row AA.5 to AD Minor Yes, documented Minor issue requires no Building and Column 11 to efflorescence. in IR 01625639. follow-up. This wall Basement Wall 12.5 No sign of active continues to be 2_1 leak. monitored per the Structures Monitoring Program.

2 Unit 1 Turbine Column 5 to 11 and Concrete Yes, documented Engineering action to Building S to V. degradation. in IR 01625642. continue to monitor this Basement Wall 2 concrete and prepare a

,... Condenser Pit plan (and initiate appropriate actions) to address the condition through the Structures Monitoring program.