05000364/LER-2015-002, Regarding Entry Into Condition Prohibited by Technical Specifications Due to All Containment Cooling Level Monitoring Systems Inoperable

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Regarding Entry Into Condition Prohibited by Technical Specifications Due to All Containment Cooling Level Monitoring Systems Inoperable
ML16008B043
Person / Time
Site: Farley Southern Nuclear icon.png
Issue date: 01/08/2016
From: Gayheart C
Southern Co, Southern Nuclear Operating Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
NL-15-2313 LER 15-002-00
Download: ML16008B043 (6)
v • d • e


LER-2015-002, Regarding Entry Into Condition Prohibited by Technical Specifications Due to All Containment Cooling Level Monitoring Systems Inoperable
Event date:
Report date:
Reporting criterion: 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications
10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded
10 CFR 50.73(a)(2)
10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition
10 CFR 50.73(a)(2)(viii)(B)
10 CFR 50.73(a)(2)(ix)(A)
10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown
10 CFR 50.73(a)(2)(1)
3642015002R00 - NRC Website
v • d • e

text

Cheryl A. Gayheart Vice President

  • Farley January 8, 2016 Southern Nuclear Operating Company, Inc.

Farley Nuclear Plant Post Office Drawer 470 Ashford, Alabama 36312 Tel334.814.4511 Fax 334.814.4575 Docket Nos.: 50-364 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Joseph M. Farley Nuclear Plant-Unit 2 Licensee Event Report 2015-002-00 SOUTHERN A COMPANY Entrv into Condition Prohibited by Technical Specifications Due to All Containment Cooling Level Monitoring Systems Inoperable Ladies and Gentlemen:

This Licensee Event Report is being submitted pursuant to the requirements of the Code of Federal Regulations, 10 CFR 50.73(a)(2)(i)(B).

This letter contains no NRC commitments. If you have any questions regarding the submittal, please contact Mr. Greg Bell at (334) 814-4765.

Sincerely, CAG/JAC Enclosure: Unit 2 Licensee Event Report 2015-002-00

U. S. Nuclear Regulatory Commission NL-15-2315 Page2 cc:

Southern Nuclear Operating Company Mr. S. E. Kuczynski, Chairman, President & CEO Mr. D. G. Bost, Executive Vice President & Chief Nuclear Officer Mr. M. D. Meier, Vice President-Regulatory Affairs Mr. D. A. Madison, Vice President-Fleet Operations Mr. B. J. Adams, Vice President - Engineering Ms. B. L. Taylor, Regulatory Affairs Manager-Farley Mr. J. E. Purcell, Operating Experience Coordinator-Farley RTYPE: CFA04.054 U. S. Nuclear Regulatory Commission Ms. C. Haney, Regional Administrator Mr. S. A. Williams, NRR Project Manager-Farley Mr. P. K. Niebaum, Senior Resident Inspector-Farley

Enclosure Joseph M. Farley Nuclear Plant-Unit 2 Unit 2 Licensee Event Report 2015-002-00 Entrv into Condition Prohibited by Technical Specifications Due to All Containment Cooling Level Monitoring Systems Inoperable

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION !APPROVED BY OMB: NO. 31&0..0104 EXPIRES: 10/31/2018 (11*201S)

Eslimaled, the NRC may not conduct or sponsor, and a person is no required to respond to, the inlormalion colleclion.

1. FACIUTY NAME

~. DOCKET NUMBER

~*PAGE Joseph M. Farley Nuclear Plant, Unit 2 05000- I 364 1 of 3

4. TITLE Entry into Condition Prohibited by Technical Specifications Due to All Containment Cooling Level Monitoring Systems Inoperable
5. EVENT DATE
6. LER NUMBER
7. REPORT DATE B. OTHER FACILITIES INVOLVED YEAR I SEQUENTIAL I REV NO FACILITY NAME DOCKET NUMBER MONTH DAY YEAR NUMBER MONTH DAY YEAR

~A 0501111-01 08 201 6 ACILITVNAME OCKET NUMBER 08 07 2015 2015. 002.

00

~A 0511110*

9. OPERATING MODE

!1. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10CFR §: (Checkallthatapply) 0 20.2201(b) 0 20.2203(a)(3)(i) 0 50.73(a)(2)(ii)(A) 0 50.73(a)(2)(vlli)(A) 1 0 20.2201(d) 0 20.2203(a)(3)(11) 0 50.73(a)(2)(ii)(B) 0 50.73(a)(2)(viii)(B) 0 20.2203(a)(1 )

0 20.2203(a)(4) 0 50.73(a)(2)(1ii) 0 50.73(a)(2)(ix)(A) 0 20.2203(8)(2)(1) 0 50.36(c)(1)(i)(A) 0 50.73(8)(2)(iv)(A) 0 50. 73(8)(2)(x)

10. POWER LEVEL 0 20.2203(8)(2)(11) 0 50.36(c)(1)(ii)(A) 0 50.73(8)(2)(v)(A) 0 73.71(8)(4) 0 20.2203(8)(2)(iii) 0 50.36(c)(2) 0 50. 73(8)(2)(v)(B)

D 73.71(a)(5) 100 0 20.2203(8)(2)(iv) 0 50.46(8)(3)(ii) 0 50. 73(a)(2)(v)(C)

D 73.n(8)(1) 0 20.2203(a)(2)(v) 0 50.73(a)(2)(i)(A)

D 50.73(8)(2)(v)(D)

D 73.n (8)(2)(1) 0 20.2203(8)(2)(vi) 181 50.73(a)(2)(1)(B) 0 50.73(8)(2)(vii)

D 73.77(8)(2)(ii) 0 50.73(8)(2)(i)(C) 0 OTHER Specify In Abslract below or In

D. CAUSE OF EVENT

364 YEAR SEQUENTIAL NUMBER 2015 002 The cause of the unrealized entry into Tech Spec 3.4.15 Condition E was an incorrect conclusion that the A, B, and D Containment Cooler Level Indicators, which had not been alarming, were operable, and that the C Containment Cooler Level Indicator was improperly alarming. This conclusion was reinforced by performance of multiple containment walkdowns and observations, maintenance troubleshooting activities, and detailed chemistry sample results of the containment sump that were strongly indicative of Service Water.

E. SAFETY ASSESSMENT

The leak in containment migrated to the containment sump which was monitored by radiation detectors.

The sump level was trended by a level monitoring indication. The site planned a maintenance outage to repair the leak. This condition had no significant effect on the health and safety of the public.

The loss of all CCLMS, along with a planned removal from service of R11 and R12 for calibration, represented an unplanned entry into Tech Spec 3.4.15 Condition E. The Condition requires an immediate entry into LCO 3.0.3 and entry into Mode 3 in 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />. The August 7, 2015 event lasted 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> and 54 minutes which exceeded the 7 hour8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> time limit and therefore constitutes a condition that is reportable pursuant to 10CFR50.73 (a)(2)(1)(B), "Any operation or condition which was prohibited by the plant's Technical Specifications."

F. CORRECTIVE ACTION

During the November 2015 planned maintenance outage repairs were completed on the containment coolers' sensing lines for full restoration of the CCLMS. Repairs were also made to the components associated with the steam leak In containment.

G. ADDITIONAL INFORMATION

1) Failed Components: Level Indicator [LI]
2) Previous Similar Events: A search did not reveal any similar reported events for Plant Farley.
3) Energy Industry Identification System Code: Containment Leakage Control System [BD]
4) Other systems affected: There were no other systems, structures, or components that were affected by or contributed to the event.
5) Commitment Information:

This report does not create any licensing commitments.

REV NO.

00

Cheryl A. Gayheart Vice President

  • Farley January 8, 2016 Southern Nuclear Operating Company, Inc.

Farley Nuclear Plant Post Office Drawer 470 Ashford, Alabama 36312 Tel334.814.4511 Fax 334.814.4575 Docket Nos.: 50-364 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Joseph M. Farley Nuclear Plant-Unit 2 Licensee Event Report 2015-002-00 SOUTHERN A COMPANY Entrv into Condition Prohibited by Technical Specifications Due to All Containment Cooling Level Monitoring Systems Inoperable Ladies and Gentlemen:

This Licensee Event Report is being submitted pursuant to the requirements of the Code of Federal Regulations, 10 CFR 50.73(a)(2)(i)(B).

This letter contains no NRC commitments. If you have any questions regarding the submittal, please contact Mr. Greg Bell at (334) 814-4765.

Sincerely, CAG/JAC Enclosure: Unit 2 Licensee Event Report 2015-002-00

U. S. Nuclear Regulatory Commission NL-15-2315 Page2 cc:

Southern Nuclear Operating Company Mr. S. E. Kuczynski, Chairman, President & CEO Mr. D. G. Bost, Executive Vice President & Chief Nuclear Officer Mr. M. D. Meier, Vice President-Regulatory Affairs Mr. D. A. Madison, Vice President-Fleet Operations Mr. B. J. Adams, Vice President - Engineering Ms. B. L. Taylor, Regulatory Affairs Manager-Farley Mr. J. E. Purcell, Operating Experience Coordinator-Farley RTYPE: CFA04.054 U. S. Nuclear Regulatory Commission Ms. C. Haney, Regional Administrator Mr. S. A. Williams, NRR Project Manager-Farley Mr. P. K. Niebaum, Senior Resident Inspector-Farley

Enclosure Joseph M. Farley Nuclear Plant-Unit 2 Unit 2 Licensee Event Report 2015-002-00 Entrv into Condition Prohibited by Technical Specifications Due to All Containment Cooling Level Monitoring Systems Inoperable

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION !APPROVED BY OMB: NO. 31&0..0104 EXPIRES: 10/31/2018 (11*201S)

Eslimaled, the NRC may not conduct or sponsor, and a person is no required to respond to, the inlormalion colleclion.

1. FACIUTY NAME

~. DOCKET NUMBER

~*PAGE Joseph M. Farley Nuclear Plant, Unit 2 05000- I 364 1 of 3

4. TITLE Entry into Condition Prohibited by Technical Specifications Due to All Containment Cooling Level Monitoring Systems Inoperable
5. EVENT DATE
6. LER NUMBER
7. REPORT DATE B. OTHER FACILITIES INVOLVED YEAR I SEQUENTIAL I REV NO FACILITY NAME DOCKET NUMBER MONTH DAY YEAR NUMBER MONTH DAY YEAR

~A 0501111-01 08 201 6 ACILITVNAME OCKET NUMBER 08 07 2015 2015. 002.

00

~A 0511110*

9. OPERATING MODE

!1. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10CFR §: (Checkallthatapply) 0 20.2201(b) 0 20.2203(a)(3)(i) 0 50.73(a)(2)(ii)(A) 0 50.73(a)(2)(vlli)(A) 1 0 20.2201(d) 0 20.2203(a)(3)(11) 0 50.73(a)(2)(ii)(B) 0 50.73(a)(2)(viii)(B) 0 20.2203(a)(1 )

0 20.2203(a)(4) 0 50.73(a)(2)(1ii) 0 50.73(a)(2)(ix)(A) 0 20.2203(8)(2)(1) 0 50.36(c)(1)(i)(A) 0 50.73(8)(2)(iv)(A) 0 50. 73(8)(2)(x)

10. POWER LEVEL 0 20.2203(8)(2)(11) 0 50.36(c)(1)(ii)(A) 0 50.73(8)(2)(v)(A) 0 73.71(8)(4) 0 20.2203(8)(2)(iii) 0 50.36(c)(2) 0 50. 73(8)(2)(v)(B)

D 73.71(a)(5) 100 0 20.2203(8)(2)(iv) 0 50.46(8)(3)(ii) 0 50. 73(a)(2)(v)(C)

D 73.n(8)(1) 0 20.2203(a)(2)(v) 0 50.73(a)(2)(i)(A)

D 50.73(8)(2)(v)(D)

D 73.n (8)(2)(1) 0 20.2203(8)(2)(vi) 181 50.73(a)(2)(1)(B) 0 50.73(8)(2)(vii)

D 73.77(8)(2)(ii) 0 50.73(8)(2)(i)(C) 0 OTHER Specify In Abslract below or In A. REQUIREMENT FOR REPORT 364 YEAR SEQUENTIAL NUMBER 2015

  • 002 For a period of seven hours and 54 minutes on August 7, 2015 all required Reactor Coolant System Leakage Detection Instrumentation monitors required by Technical Specifications (TS) 3.4.15 were out of service and the required action per TS 3.4.15 Condition E and Limiting Condition for Operation (LCO) 3.0.3 to place the unit in Mode 3 within 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> was not met. This is a condition prohibited by TS and is reportable in accordance with 10 CFR 50.73 (a)(2)(i)(B).

B. UNIT STATUS AT TIME OF EVENT Unit 2, Mode 1, 100 percent power

C. DESCRIPTION OF EVENT

On November 12, 2015 at approximately 02:00 COT, Farley Unit 2 was operating in Mode 5 at zero percent power and was in a planned maintenance outage to investigate a leak inside of containment. A troubleshooting effort was initiated to investigate numerous maintenance issues that had been occurring with the A, B, and D Containment Cooler Level Indicators (EllS Code Ll). The troubleshooting work revealed that the A, B, and D Containment Cooler Level Indicators were inoperable and were considered to have been inoperable since July 6, 2015, when drainage into the containment sump had exceeded one gallon per minute. During this time frame the plant conducted extensive investigations into the source of the leakage, including multiple containment walkdowns and observations, maintenance troubleshooting activities, and detailed chemistry sample results of the containment sump, all of which led to the conclusion of a Service Water leak from the C Containment Cooler. The plant also prepared for a maintenance outage In the event that the leakage approached shutdown thresholds and implemented measures to protect the plant from the consequences of increased leakage.

During the November 2015 maintenance outage a steam leak was found in Containment and was verified as the cause of the Containment Cooling Level Monitoring System (CCLMS) alarms. The A, B, and D containment coolers' sensing lines were found to be clogged and therefore the level transmitters were unable to perform their function.

A subsequent review of operator logs showed that on August 7, 2015 the Band C Containment Cooler Level Indicators were declared inoperable to perform troubleshooting. On the same day, containment radiation monitors R11 and R12 were taken out of service for calibration surveillance. Since A and D CCLMS were discovered to have been inoperable, this created an unrealized entry into Tech Spec 3.4.15 Condition E (all detection inoperable) for a period of seven hours and 54 minutes, and the required action of immediate entry into Limiting Condition for Operation (LCO) 3.0.3 requiring the plant to be in MODE 3 in 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> was not met.

The CCLMS and the steam leak were repaired prior to exiting the maintenance outage.

REV NO.

00

D. CAUSE OF EVENT

364 YEAR SEQUENTIAL NUMBER 2015 002 The cause of the unrealized entry into Tech Spec 3.4.15 Condition E was an incorrect conclusion that the A, B, and D Containment Cooler Level Indicators, which had not been alarming, were operable, and that the C Containment Cooler Level Indicator was improperly alarming. This conclusion was reinforced by performance of multiple containment walkdowns and observations, maintenance troubleshooting activities, and detailed chemistry sample results of the containment sump that were strongly indicative of Service Water.

E. SAFETY ASSESSMENT

The leak in containment migrated to the containment sump which was monitored by radiation detectors.

The sump level was trended by a level monitoring indication. The site planned a maintenance outage to repair the leak. This condition had no significant effect on the health and safety of the public.

The loss of all CCLMS, along with a planned removal from service of R11 and R12 for calibration, represented an unplanned entry into Tech Spec 3.4.15 Condition E. The Condition requires an immediate entry into LCO 3.0.3 and entry into Mode 3 in 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />. The August 7, 2015 event lasted 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> and 54 minutes which exceeded the 7 hour8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> time limit and therefore constitutes a condition that is reportable pursuant to 10CFR50.73 (a)(2)(1)(B), "Any operation or condition which was prohibited by the plant's Technical Specifications."

F. CORRECTIVE ACTION

During the November 2015 planned maintenance outage repairs were completed on the containment coolers' sensing lines for full restoration of the CCLMS. Repairs were also made to the components associated with the steam leak In containment.

G. ADDITIONAL INFORMATION

1) Failed Components: Level Indicator [LI]
2) Previous Similar Events: A search did not reveal any similar reported events for Plant Farley.
3) Energy Industry Identification System Code: Containment Leakage Control System [BD]
4) Other systems affected: There were no other systems, structures, or components that were affected by or contributed to the event.
5) Commitment Information:

This report does not create any licensing commitments.

REV NO.

00

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