05000529/LER-2005-001, Regarding Reactor Head Vent Axial Indications Caused by Degraded Alloy 600 Component

Regarding Reactor Head Vent Axial Indications Caused by Degraded Alloy 600 Component

ML051880073
Person / Time
Site:	Palo Verde
Issue date:	06/20/2005
From:	Danni Smith Arizona Public Service Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
102-05299-DMS/CKS/DJS LER 05-001-00
Download: ML051880073 (7)

LER-2005-001, Regarding Reactor Head Vent Axial Indications Caused by Degraded Alloy 600 Component

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2) 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(iii) 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
5292005001R00 - NRC Website

text

1 OCFR50.73 LAMP Palo Verde Nudear Generating Station A subsidiary of Pinnacle West Capital Corporation David M. Smith Plant Manager Nuclear Production Tel: 623-393-6116 Faxz 623-393-6077 e-mail: DSMlTH10@apsccom Mail Station 7602 PO Box 52034 Phoenix. Arizona 85072-2034 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 102-05299-DMS/CKS/DJS June 20, 2005

Dear Sirs:

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Unit 2 Docket No. STN 50-529 License No. NPF-51 Licensee Event Report 2005-001-00 Attached please find Licensee Event Report (LER) 50-529/2005-001-00 that has been prepared and submitted pursuant to 1 OCFR50.73. This LER reports the discovery and corrective actions taken as a result of finding two axial indications in the reactor vessel head vent penetration during the unit's 12t refueling outage. While performing reactor vessel head vent eddy current examinations and data evaluation, two (2) axial indications were confirmed on the vent ID surface, indicating potential primary water stress corrosion cracking (PWSCC) and degradation of the vent penetration. The axial indications were repaired prior to Unit 2 resuming power operation.

The corrective actions described in this LER are not necessary to maintain compliance with regulations. 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 Daniel G. Marks, Section Leader, Regulatory Affairs, at (623) 393-6492.

Sincerely, DMS/CKS/DJS/ca Attachment cc:

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

NRC Senior Resident Inspector for PVNGS LA
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APPROVED BY OMB: NO. 3150-0104 EXPIRES: 06/30/2007 Estumated burden per response to comply With this mandatory collection NRC004 OR 36 U..NCERR ULTRCOMSIN 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 (LI2004)

EOprocess and fed back to Industry. Send comments regarding burden estimate to LICENSEE EVENT REPORT (LER) the Records and FOIAJPrivacy Service Branch (T-5 F52), U.S. Nuclear (See reverse for required number of Regulatory Commission, Washington. DC 20555-0001, or by Internet e-mail to digltslcharacters for each block)

Infocollects@nrc.gov, and to the Desk Officer, Office of Information and Regulatory Affairs, NEOB-10202, (3150-0104). Office of Management and Budget. Washington, DC 20503. If a means used to Impose an Information

3. PAGE Palo Verde Nuclear Generating Station (PVNGS) Unit 2 05000529 1 OF 6

4. TITLE REACTOR HEAD VENT AXIAL INDICATIONS CAUSED BY DEGRADED ALLOY 600 COMPONENT

5. EVENT DATE

6. LER NUMBER

7. REPORT DATE

8. OTHER FACILITIES INVOLVED FACILITY NAME DOCKET NUMBER MONTH DAY YEAR YEAR SEQUENTIAL REV MONTH DAY YEAR 05000 INUMBER NO.

50 FACILITY NAME DOCKET NUMBER 04 23 2005 2005 - 001 -

00 06 20 2005 05000

9. OPERATING MODE II. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR§: (Check all that apply) o 20.2201(b) 0 20.2203(a)(3)(i) 0 50.73(a)(2)(i)(C) 0 50.73(a)(2Xvi) 6 - Defueled 0 20.2201(d) 0 20.2203(aX3)(ii) xx 50.73(a)(2)(iiXA)

El 50.73(a)(2Xvviii)(A) o 20.2203(a)(1)

El 20.2203(a)(4)

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

El 50.73(a)(2xviii)(B) 0I 20.2203(a)(2Xi) 0 50.36(c)(1)(i)(A) 0 50.73(a)(2)(iii) 0 50.73(a)(2Xix)(A)

10. POWER LEVEL 0 20.2203(aX2XIi)

El 50.36(c)(1)(iiXA) 0 50.73(a)(2)(ivXA) 0 50.73(a)(2Xx) o 20.2203(a)(2XIii) a 50.36(c)(2) 0 50.73(a)(2)(v)(A)

El 73.71(a)(4) o 20.2203(a)(2)(iv)

El 50.46(a)(3)(ii) 0 50.73(a)(2)(v)(B)

El 73.71(a)(5) 000 0 20.2203(a)(2)(v)

Dl 50.73(a)(2)(i)(A) 0 50.73(a)(2)(v)(C) 0 OTHER El 20.2203(aX2)(vi) 0 50.73(aX2)(i)(B) 0 50.73(a)(2)(v)(D)

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