05000374/LER-2013-001, Regarding Pin Hole Leaks Identified in High Pressure Core Spray Piping

Regarding Pin Hole Leaks Identified in High Pressure Core Spray Piping

ML13168A576
Person / Time
Site:	LaSalle
Issue date:	06/17/2013
From:	Vinyard H Exelon Generation Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RA13-032 LER 13-001-00
Download: ML13168A576 (4)

LER-2013-001, Regarding Pin Hole Leaks Identified in High Pressure Core Spray Piping

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(viii)(A) 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(viii)(B) 10 CFR 50.73(a)(2)(iii) 10 CFR 50.73(a)(2)(ix)(A) 10 CFR 50.73(a)(2)(iv)(A), System Actuation 10 CFR 50.73(a)(2)(x) 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.73(a)(2)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications
3742013001R00 - NRC Website

text

10 CFR 50.73 RA13-032 June 17, 2013 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 LaSalle County Station, Units 2 Facility Operating License Nos. NPF-18 NRC Docket No. 50-374

Subject:

Licensee Event Report 2013-001-00 Pin Hole Leaks Identified in High Pressure Core Spray Piping In accordance with 10 CFR 50.73(a)(2)(v)(D) and 50.73(a)(2)(ii)(A), Exelon Generation Company (EGC), LLC, is submitting Licensee Event Report Number 2013-001-00 for LaSalle Unit 2.

There are no regulatory commitments in this letter. Should you have any questions concerning this report, please contact Mr. Guy V. Ford, Regulatory Assurance Manager, at (815) 415-2800.

Respectfully, Harold T. Vinyard Plant Manager LaSalle County Station

Enclosure:

Licensee Event Report cc:

Regional Administrator - NRC Region Ill NRC Senior Resident Inspector - LaSalle County Station

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 10/31/2013 (10-2010)

, the NRC may digits/characters for each block) not conduct or sponsor, and a person is not required to respond to, the information collection.

3. PAGE LaSalle County Station, Unit 2 05000374 1

OF 3

4. TITLE Pin Hole Leaks Identified in High Pressure Core Spray Piping

5. EVENT DATE

6. LER NUMBER

7. REPORT DATE

8. OTHER FACILITIES INVOLVED MONTH DAY YEAR YEAR SEQUENTIAL NUMBER REV NO.

MONTH DAY YEAR FACILITY NAME N/A DOCKET NUMBER N/A FACILITY NAME DOCKET NUMBER 04 18 2013 2013 001 00 06 17 2013 N/A N/A

9. OPERATING MODE

11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply) q 20.2201(b) q 20.2203(a)(3)(i) q 50.73(a)(2)(i)(C) q 50.73(a)(2)(vii) 3 q 20.2201(d) q 20.2203(a)(3)(ii) 50.73(a)(2)(ii)(A) q 50.73(a)(2)(viii)(A) q 20.2203(a)(1) q 20.2203(a)(4) q 50.73(a)(2)(ii)(B) q 50.73(a)(2)(viii)(B) q 20.2203(a)(2)(i) q 50.36(c)(1)(i)(A) q 50.73(a)(2)(iii) q 50.73(a)(2)(ix)(A)

10. POWER LEVEL q 20.2203(a)(2)(ii) q 50.36(c)(1)(ii)(A) q 50.73(a)(2)(iv)(A) q 50.73(a)(2)(x) q 20.2203(a)(2)(iii) q 50.36(c)(2) q 50.73(a)(2)(v)(A) q 73.71(a)(4) 000 q 20.2203(a)(2)(iv) q 50.46(a)(3)(ii) q 50.73(a)(2)(v)(B) q 73.71(a)(5) q 20.2203(a)(2)(v) q 50.73(a)(2)(i)(A) q 50.73(a)(2)(v)(C) q OTHER q 20.2203(a)(2)(vi) q 50.73(a)(2)(i)(B) 50.73(a)(2)(v)(D)

Specify in Abstract below or in D.

SAFETY ANALYSIS

The safety significance of this event was minimal. Although the system was declared inoperable, HPCS was still available with pin hole leaks in the minimum flow line. Containment leakage from the pin hole leaks in the HPCS minimum flow line, although not quantified, would have been minimal due to their size. The leaks were discovered with the Unit shutdown in Mode 3, and the Unit was placed in Mode 4 within 13 hours1.50463e-4 days <br />0.00361 hours <br />2.149471e-5 weeks <br />4.9465e-6 months <br /> of discovery.

E.

CORRECTIVE ACTIONS

The leaking pipe elbow was replaced on Unit 2.

An extent of condition wall-thickness ultrasonic inspection of piping and elbows downstream of the flow orifice on Unit I and Unit 2 HPCS minimum flow lines was performed.

The first elbow after the flow orifice on the Unit 1 HPCS minimum flow line will be replaced during the next refueling outage.

Operations procedures will be reviewed and revised as required to provide consistent guidance for minimizing operation of HPCS in minimum flow mode.

ECCS lesson plans will be updated as needed to incorporate guidance for minimizing operation in minimum flow mode.

F.

PREVIOUS OCCURRENCES

A review identified no previous reportable events within the past ten years caused by piping leakage from erosion and/or corrosion.

G.

COMPONENT FAILURE DATA

Schedule 40, six inch diameter piping.