05000528/LER-2006-005, Re Technical Specification Prohibited Condition Due to Check Valve Not Seated

Re Technical Specification Prohibited Condition Due to Check Valve Not Seated

ML063460048
Person / Time
Site:	Palo Verde
Issue date:	11/30/2006
From:	Eubanks C Arizona Public Service Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
102-05601-CE/CKS/REB LER 06-005-00
Download: ML063460048 (7)

LER-2006-005, Re Technical Specification Prohibited Condition Due to Check Valve Not Seated

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
5282006005R00 - NRC Website

text

10 CFR 50.73 LA4M A subsidiary of Pinnacle West Capital Corporation Palo Verde Nuclear Generating Station Cliff Eubanks Vice President Nuclear Operations Tel (623) 393-6116 Fax (623) 393-6077 Mail Station 7602 PO Box 52034 Phoenix, Arizona 85072-2034 102-05601-CE/CKS/REB November 30, 2006 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001

Dear Sirs:

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit 1 Docket No. STN 50-528 License No. NPF-41 Licensee Event Report 2006-005-00 Attached please find Licensee Event Report (LER) 50-528/2006-005-00 that has been prepared and submitted pursuant to 10 CFR 50.73. This LER reports the failure of a safety injection system check valve to properly seat.

Arizona Public Service Company makes no commitments in this letter.

In accordance with 10 CFR 50.73(d), copies of this LER are being forwarded to the NRC Regional Office, NRC Region IV and the Senior Resident Inspector. If you have questions regarding this submittal, please contact James Proctor, Section Leader, Regulatory Affairs, at (623) 393-5730.

CE/CKS/REB/gt Attachment cc:

B. S. Mallett M. B. Fields G. G. Warnick Sincerely, NRC Region IV Regional Administrator NRC NRR Project Manager - (send electronic and paper)

NRC Senior Resident Inspector for PVNGS A member of the STARS (strategic Teaming and Resource Sharing) Alliance Callaway 0 Comanche Peak 0 Diablo Canyon 0 Palo Verde C South Texas Project C Wolf Creek

APPROVED BY OMB: NO. 3150-0104 EXPIRES: 06/30/2007 NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION Estimated burden per response to comply with this mandatory collection (6-2004) request: 50 hours5.787037e-4 days <br />0.0139 hours <br />8.267196e-5 weeks <br />1.9025e-5 months <br />. Reported lessons learned are incorporated into the licensing LICENSEE EVENT REPORT (LER) process and fed back to industry. Send comments regarding burden estimate to (See reverse for required number of the Records and FOIA/Privacy Service Branch (T-5 F52), U.S. Nuclear (igits/earev terse for req d nuberof)

Regulatory Commission, Washington, DC 20555-0001, or by internet e-mail to digits/characters for each block) 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

1. FACILITY NAME

12. DOCKET NUMBER

13. PAGE Palo Verde Nuclear Generating Station (PVNGS) Unit 1 05000528 1 OF 6

4. TITLE TECHNICAL SPECIFICATION PROHIBITED CONDITION DUE TO CHECK VALVE NOT SEATED

5. EVENT DATE

6. LER NUMBER

7. REPORT DATE

8. OTHER FACILITIES INVOLVED MONTH DAY YEAR YEAR SEQUENTIAL REV MONTH DAY YEA FACILITY NAME DOCKET NUMBER NUMBER NO.

05000 j

j0FACILITY NAME DOCKET NUMBER 10 05 2006 2006 -005 00 11 30 2006 05000

9. OPERATING MODE

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

[1 20.2201(b)

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

[I 50.73(a)(2)(i)(C)

[I 50.73(a)(2)(vii) 3 0 20.2201(d)

[I 20.2203(a)(3)(ii)

[I 50.73(a)(2)(ii)(A)

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

[I 20.2203(a)(1)

[I 20.2203(a)(4)

[I 50.73(a)(2)(ii)(B)

[: 50.73(a)(2)(viii)(B)

[E 20.2203(a)(2)(i)

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

[I 50.73(a)(2)(iii)

[I 50.73(a)(2)(ix)(A)

10. POWER LEVEL [I 20.2203(a)(2)(ii)

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

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

[I 50.73(a)(2)(x)

El 20.2203(a)(2)(iii)

[I 50.36(c)(2)

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

[I 73.71(a)(4)

[I 20.2203(a)(2)(iv) 0l 50.46(a)(3)(ii)

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

[1 73.71(a)(5) 000 [1 20.2203(a)(2)(v) 0l 50.73(a)(2)(i)(A)

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

[I OTHER [I 20.2203(a)(2)(vi) 0 50.73(a)(2)(i)(B)

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

Specify in Abstract below or in (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 (If more space is required, use additional copies of NRC Form 366A)

Contributing causes have preliminarily been determined to be:

" Roughness of the valve seat.

A build up of film on the spherical bearing - CRUD/magnetite that collects in RCS low flow areas.

Indentations of disc stud threads on the ID of the spherical bearing and a spherical bearing rub mark on the disc stud weld.

A supplement to this LER will be submitted after the investigation has been completed.

No unusual characteristics of the work location (e.g., noise, heat, poor lighting) directly contributed to this event. No personnel or procedural errors have been identified that contributed to this event.

7.

CORRECTIVE ACTIONS

SI-1 34 was disassembled and inspected. A new bonnet/disc assembly was installed in the valve and the valve passed required testing.

Any additional corrective actions taken as a result of this event will be implemented in accordance with the PVNGS corrective action program.

8.

PREVIOUS SIMILAR EVENTS

LER 50-529/2000-006-01 reported a condition in which a safety injection tank (SIT)(EIIS:

TK) discharge check valve did not seat properly. The root cause of that event was reported as a lack of preventive maintenance (PM) activities for the SIT discharge check valves sufficient enough to prevent the unacceptable buildup of contaminants on the spherical bearings and hinge arm joint. Corrective actions from that event were to inspect the 14 inch ECCS check valves however, SI-134 is a 12 inch check valve and was not included in the scope. In 2005 the 12 inch check valves were incorporated into the inspection schedule and SI-134 was scheduled to be inspected during the Unit 1 refueling outage scheduled for the spring of 2007.