05000400/LER-2010-002, Manual Actuation of the Reactor Protection System Due to Hydrogen Seal Oil Leak

Manual Actuation of the Reactor Protection System Due to Hydrogen Seal Oil Leak

ML100260567
Person / Time
Site:	Harris
Issue date:	01/14/2010
From:	Henderson K Progress Energy Carolinas
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
LER 10-002-00
Download: ML100260567 (4)

LER-2010-002, Manual Actuation of the Reactor Protection System Due to Hydrogen Seal Oil Leak

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded 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)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications
4002010002R00 - NRC Website

text

3P~r gress-nergy JAN 14 2010

'Serial: HNPý10-'010 10 CFR 50.73 U.S. 'Nuclear RegulatoryCommission ATTN: Document Control Desk

.Washington, DC 20555 SHEARON HARRIS NUCLEAR POWER PLANT, UNIT 1 DOCKET NO. 50-400/RENEWED LICENSE ýNO. NPF-63 LICENSEE EVENT REPORT 2010-002-00' Ladies and Gentlemen:

The enclosed Licensee Event Report (LER) 2010-002-00 is submitted in accordance with 10 CFR 50.73, paragraph (a)(2)(iv)(A), an event or condition that resulted in manual actuation of the Reactor Protection System. This report describes an event in which an oil leak from the Hydrogen Seal Oil System required a manual reactor trip. In accordance with 10 CFR 50.73(a) requirements, this LER is submitted within 60 days following the event.

This document contains no Regulatory Commitments.

Please refer any questions regarding this submittal to Mr. Dave Corlett, Supervisor -

Licensing/Regulatory Programs, at (919) 362-3137.

SSinc er el1.y Kelvin Henderson Plant General Manager Harris Nuclear Plant KH/jmd Enclosure cc:

Mr. J. D. Austin, NRC Senior Resident Inspector, HNP Mr. L. A. Reyes, NRC Regional Administrator, Region II Ms. M. G. Vaaler, NRC Project Manager, HNP Progress Energy Carolinas, Inc.

Harris Nuclear Plant P 0. Box 165 New Hill, NC 27562

NRC'FORM 366

- U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104

'EXPIRES: 08/31/2010 Estimated burden,per response to comply with this mandatory collection request: 80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br />. Reported lessons learned are incorporated into the licensing process and fed back to industry. Send comments regarding burden estimate to the Records and FOIA/Privacy Service Branch (T-5 F52), U.S.

LICENSEE EVENT REPORT (LER)

Nuclear Regulatory Commission, Washington, DC 20555-0001, or by internet e-mail to infocollects@nrc.gov, and to the Desk Officer, Office of Information and Regulatory Affairs, NEOB-1 0202, (3150-0104), Office of Management and Budget, Washington, DC 20503. If a means used to impose an information (See reverse for required number of collection does not display a currently valid OMB control number, 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 Harris Nuclear Plant - Unit 1 05000400 1 'f 3

4. TITLE Manual Actuation of the Reactor Protection System due to Hydrogen Seal Oil Leak

5. EVENT DATE

6. LER NUMBER

7. REPORT DATE 1

8. OTHER FACILITIES INVOLVED MONTH DAY YEAR YEAR SEQUENTIAL REV MONTH DAY YEAR N/A 05000 NUMBER NO.N/05 0

Il_

i i

_ IFACILITY NAME DOCKET NUMBER 11 15 2009 2010 - 002 -

00 01 14 2010 N/A 05000

9. OPERATING MODE

11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR§: (Check all that apply)

El 20.2201(b)

[I 20.2203(a)(3)(i)

El 50.73(a)(2)(i)(C)

El 50.73(a)(2)(vii)

El 20.2201(d)

El 20.2203(a)(3)(ii)

El 50.73(a)(2)(ii)(A)

[E 50.73(a)(2)(viii)(A)

El 20.2203(a)(1)

[I 20.2203(a)(4)

El 50.73(a)(2)(ii)(B)

El 50.73(a)(2)(viii)(B)

El 20.2203(a)(2)(i)

[I 50.36(c)(1)(i)(A)

El 50.73(a)(2)(iii)

El 50.73(a)(2)(ix)(A)

10. POWER LEVEL E] 20.2203(a)(2)(ii)

[I 50.36(c)(1)(ii)(A)

ED 50.73(a)(2)(iv)(A)

[E 50.73(a)(2)(x)

E] 20.2203(a)(2)(iii)

[I 50.36(c)(2)

El 50.73(a)(2)(v)(A)

El 73.71(a)(4)

El 20.2203(a)(2)(iv)

[I 50.46(a)(3)(ii)

El 50.73(a)(2)(v)(B)

El 73.71(a)(5) 100 El 20.2203(a)(2)(v) 0l 50.73(a)(2)(i)(A)

E3 50.73(a)(2)(v)(C)

El OTHER El 20.2203(a)(2)(vi)

El 50.73(a)(2)(i)(B)

El 50.73(a)(2)(v)(D)

Specify in Abstract below or in NRC Form 366A

12. LICENSEE CONTACT FOR THIS LER FACILITY NAME TELEPHONE NUMBER (include Area Code)

John M. Doorhy Jr. - Licensing Specialist 1 (919) 362-2137CAS YTMCMOET MANU-REPORTABLE CAS YTMCMOET MANU-REPORTABLE

CAUSE

COMPONENT FACTURER TO EPIX

CAUSE

COMPONENT FACTURER TO EPIX D

TI STIR Cuno Eng.

N Corp.

I

14. SUPPLEMENTAL REPORT EXPECTED

15. EXPECTED MONTH DAY YEAR SUBMISSION El YES (If yes, complete 15. EXPECTED SUBMISSION DATE) 0 NO DATE ABSTRACT (Limit to 1400 spaces, i.e., approximately 15 single-spaced typewritten lines)

On November 15, 2009, at 100% power, the Harris plant experienced a significant oil leak from the Hydrogen Seal Oil system. A non-licensed operator notified the Main Control Room (MCR) that the handle rotated each shift by Operations on the Air Side Seal Oil self-cleaning strainer became disconnected during manual rotation after approximately 1/4 turn, resulting in the oil leak. Based on this report and due to receipt of a "Turbine Lube Oil Reservoir Low Level" alarm, a decision was made to initiate a unit shutdown. The unit was manually tripped at 22:42 by the Main Control Room Operators. The plant promptly attained normal operation no-load temperature and pressure. Following the reactor trip, the "B" steam generator Main Steam Isolation Valve (MSIV) failed to fully close on demand, but was closed due to field actions at 23:03.

The root cause of the Hydrogen Seal Oil leak was that for past maintenance performed on the Air Side Seal Oil strainer, the Graded Approach to Planning and Scheduling instructions and Decision Tree was too generic. When considering the level of planning detail, the work coordination management procedure, WCM-006 does not provide guidance on considering the vulnerabilities to the plant as a result of the work being performed on the component. As a result, the thrust collars that hold the filter handle in place were not installed during past maintenance which allowed the filter handle to eject.

Immediate corrective actions were to stabilize the plant, and secure the Turbine Seal Oil/Lube Oil systems to stop the leak.

Aqueous foam was sprayed on the oil to prevent a fire hazard. The oil was cleaned up and the Air Side Seal Oil strainer replaced. Planned corrective actions to prevent recurrence are to revise and implement WCM-006 such that Level "A" work activities (Quality Critical) are classified based on Equipment Classification that could cause a plant transient or shutdown and define other criteria for Level "A" (Quality Critical).

NRC FORM 366 (9-2007)

PRINTED ON RECYCLED PAPER

--4U.S. NUCLEAR REGULATORY COMMISSION (9-2007)

LICENSEE EVENT REPORT (LER)

CONTINUATION REPORT

1. FACILITY NAME

2. DOCKET

6. LER NUMBER

3. PAGE SEQUENTIAL I REVISION, Harris Nuclear Plant - Unit 1 Y

T NUMBER NUMBER 05000-400 2010 002 00 2

OF 3

Energy Industry Identification System (EIIS) codes are identified in the text within brackets

1.

DESCRIPTION OF EVENT

There were no structures, systems, or components that were inoperable at the start of the event which could have contributed to the event. On November 15, 2009, at 100% power, the Harris plant experienced a significant oil leak from the Hydrogen Seal Oil system [TI]. A non-licensed operator notified the Main Control Room (MCR) that the handle rotated each shift by Operations on the Air Side Seal Oil self-cleaning strainer became disconnected during manual rotation after approximately 1/4 turn, resulting in the oil leak. Based on this report and due to receipt of a "Turbine Lube Oil Reservoir Low Level" alarm, a decision was made to initiate a unit shutdown. The unit was manually tripped at 22:42 by the Main Control Room Operators. The plant promptly attained normal operation no-load temperature and pressure. Following the reactor trip, the "B" steam generator Main Steam Isolation Valve (MSIV) [SB] failed to fully close on demand, but was closed due to field actions at 23:03. The handle rotated each shift by Operations on the Air Side Seal Oil self-cleaning strainer [STR] became disconnected during manual rotation after approximately 1/4 turn, resulting in the oil leak. Aqueous foam was quickly sprayed on the oil to prevent a fire hazard. The loss of approximately 9,500 gallons of lube oil to the 261 ft elevation of the turbine building occurred with a small amount reaching the nearby gravel. No oil reached the Harris Lake. The oil was cleaned up and the Air Side Seal Oil strainer replaced. The Hydrogen Seal Oil/Lube Oil system was replenished and the unit was returned to service on November 20, 2010, at 2020.

11. CAUSE OF THE EVENT

The root cause of this failure was that during past maintenance on the Air Side Seal Oil strainer, the Graded Approach to Planning and Scheduling procedure (WCM-006) instructions and Decision Tree was too generic.

When considering level of planning detail, WCM-006 does not provide guidance on considering the vulnerabilities to the plant as a result of the work being performed on the component. This resulted in maintenance being performed on a critical component without the use of vendor drawings to validate that all parts are installed as designed. Troubleshooting indicated that the thrust collars that hold the filter handle in place were not installed during past maintenance, allowing the filter handle to eject.

I1l.

SAFETY SIGNIFICANCE

This event is being reported pursuant to 10 CFR 50.73(a)(2)(iv)(A), an event or condition that resulted in manual actuation of the Reactor Protection System. The actual consequences resulted in a manual reactor trip and spillage of large quantities of oil to the turbine building floor and some smaller amounts to the ground. No oil reached the Harris Lake. The manual reactor trip is bounded by the analysis in Chapter 15 of the Final Safety Analysis Report (FSAR). The operating staff performed the required actions for the trip and there were no adverse

safety consequences

Potential environmental consequences could have resulted if oil had reached the lake. Damage to plant equipment, and/or personal injury also could have occurred.

IV. CORRECTIVE ACTIONS

Immediate corrective actions were to stabilize the plant, and secure the Turbine Seal ýOil/Lube Oil systems to stop the leak. Aqueous foam was sprayed on the oil to prevent a fire hazard. The oil was cleaned up and the Air Side Seal Oil strainer replaced. Planned corrective actions to prevent recurrence are to revise and implement WCM-006, Graded Approach to Planning and Scheduling such that Level "A" work activities (Quality Critical) are classified based on Equipment Classification that could cause a plant transient or shutdown and define other criteria for Level "A" (Quality Critical). Planning Level "A" is used for tasks that require additional rigor in preparation, oversight and implementation because the task can significantly impact plant operation or equipment.PRiNTED ON RECYCLED PAPERPRINTED ON RECYCLED PAPERU.S. NUCLEAR REGULATORY COMMISSION (9-2007)

LICENSEE EVENT REPORT (LER)

CONTINUATION REPORT

1. FACILITY NAME

2. DOCKET

6. LER NUMBER

3. PAGE YEAR SEQUENTIAL

REVISION, Harris Nuclear Plant - Unit 1 1

NUMBER NUMBER 05000-400 2010 002 00 3

OF 3

V.

PREVIOUS SIMILAR EVENTS

A review of License Event Reports for the previous five years did not reveal any similar events at the Harris Plant.PRINTED ON RECYCLED PAPER