05000499/LER-2005-006, Re Missing Motor-Operated Valve T-Drains

Re Missing Motor-Operated Valve T-Drains

ML053620023
Person / Time
Site:	South Texas
Issue date:	12/20/2005
From:	Parkey G South Texas
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NOC-AE-05001949 LER 05-006-00
Download: ML053620023 (8)

LER-2005-006, Re Missing Motor-Operated Valve T-Drains

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 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)(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
4992005006R00 - NRC Website

text

Nuclear Operating Company South Texas Prqf EkdiC G0 fneiStatin PO. Bx 28.9 HMdm A T 77483 December 20, 2005 NOC-AE-05001949 10CFR50.73 U. S. Nuclear Regulatory Commission Attention: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852 South Texas Project Unit 2 Docket No. STN 50-499 Licensee Event Report 2005-06, Missing Motor-Operated Valve T-Drains Pursuant to 10 CFR 50.73(a)(2)(i)(B), STP Nuclear Operating Company submits the attached Unit 2 Licensee Event Report 2005-06 regarding missing T-drains in two motor-operated valves that rendered the systems inoperable.

This event did not have an adverse effect on the health and safety of the public.

There are no commitments contained in this event report. Resulting corrective actions will be implemented in accordance with the Corrective Action Program.

If there are any questions regarding this submittal, please contact S. M. Head at (361) 972-7136 or me at (361) 972-7800.

G. L. Parkey Vice President, Generation and Plant General Manager jtc/

Attachment: LER 2005-06 STI: 31958774

NOC-AE-05001949 Page 2 of 2 cc:

(paper copy)

(electronic copy)

Bruce S. Mallett Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 Richard A. Ratliff Bureau of Radiation Control Texas Department of State Health Services 1100 West 49th Street Austin, TX 78756-3189 Jeffrey Cruz U. S. Nuclear Regulatory Commission P. 0. Box 289, Mail Code: MN116 Wadsworth, TX 77483 C. M. Canady City of Austin Electric Utility Department 721 Barton Springs Road Austin, TX 78704 A. H. Gutterman, Esquire Morgan, Lewis & Bockius LLP Mohan C. Thadani U. S. Nuclear Regulatory Commission Jack A. Fusco Michael A. Reed Texas Genco, LP C. Kirksey City of Austin Jon C. Wood Cox Smith Matthews J. J. Nesrsta R. K. Temple E. Alarcon City Public Service

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 06/30/2007 (6-2004)

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

3. PAGE South Texas Unit 2 0500049 1 OF 6

4. TITLE Missing Motor-Operated Valve T-Drains

5. EVENT DTE

6. LER NUMBER

7. REPORT DATE S. OTHER FACILmES INVOLVED SEUE TIA REVFACILITY NAME DOCKET NUMBER MONTH DAY YEAR YEAR NUMBER REV MONTH DAY YEAR 05000 I

FACILITY NAME DOCKET NUMBER 10 18 2005 2005 - 006 -

12 20 2005 05000

9. OPERATING MODE

11. THIS REPORT IS SUBMrTlED PURSUANT TO THE REOUIREMENTS OF 10 CFR§: (Check all that apply) o 20.2201(b) 0 20.2203(a)(3)(i)

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

El 50.73(a)(2)(vii) 6 0 20.2201(d) 0 20.2203(a)(3)(ii) 0 50.73(a)(2)(ii)(A) 0 50.73(a)(2)(viii)(A) 0 20.2203(a)(1)

El 20.2203(a)(4) 0] 50.73(a)(2)(ii)(B)

E 50.73(a)(2)(viii)(B) 0O 20.2203(a)(2)(i)

El 50.36(c)(1)(i)(A)

[l 50.73(a)(2)(iii)

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

10. POWER LEVEL 0

20.2203(a)(2)(ii)

El 50.36(c)(1)(ii)(A)

[] 50.73(a)(2)(iv)(A)

El 50-73(a)(2)(x) 0 20.2203(a)(2)(iii)

El 50.36(c)(2)

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

D 73.71 (a)(4) o 20.2203(a)(2)(iv) al 50.46(a)(3)(ii) 0l 50.73(a)(2)(v)(B)

O 73.71 (a)(5) 000 E 20.2203(a)(2)(v)

El 50.73(a)(2)(i)(A)

El 50.73(a)(2)(v)(C)

E OTHER 0 20.2203(a)(2)(vi) 0 50.73(a)(2)(i)(B) 0 50.73(a)(2)(v)(D)

Specify in Abstract below L__

_LCENSEECONTACor in SUMMARY OF THE EVENT, INCLUDING DATES AND APPROXIMATE TIMES On October 18, 2005 at approximately 17:33, while performing a lubrication and inspection on valve 2-SI-MOV-001 9C (SI-1 9C), Low Head Safety Injection Train C to Loop 2C Hot Leg Isolation Motor Operated Valve (MOV), the actuator motor was discovered with ordinary pipe plugs installed instead of the two required T-drains.

During the subsequent inspection of other Unit 2 MOVs, valve 2-RA-MOV-0003 (RA-03), inside return isolation valve for Containment radiation monitor RT-801 1, was discovered to have one ordinary pipe plug and one T-drain installed rather than the two required T-drains. This condition makes the valves inoperable and constitutes a Technical Specification violation. The purpose of the T-drains is to facilitate draining condensation from the motor in a harsh environment; hence, they are required as part of the motors environmental qualification.

T-drains are ordinary pipe plugs with a drain path drilled up the plug centerline to the square head of the plug with an intersecting drain path drilled perpendicular to the plug centerline through two opposite faces of the square head.

(If more space is required, use additional copies of (If more space Is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copieS of NRC Form 38A) (17)

6. Train contract MOV personnel prior to 1 RE13 on:

• The Lessons Learned from this event.

• Management expectations regarding proper use of written instructions.

• The justification for and importance of Environmental Qualification requirements of the equipment they maintain.

7. Implement the discipline program protocol with STPNOC individuals involved.

REMEDIAL ACTIONS

1. The required T-drains were installed in SI-19C and RA-03.

2.

An inspection of all accessible harsh environment MOVs in both units was completed on October 22, 2005. The Unit 1 MOVs located inside the missile barrier will be inspected during 1RE13.

VI.

PREVIOUS SIMILAR EVENTS

LER 2-93-008 (event date May 5,1993)