05000528/LER-2006-004, Re TS Required Reactor Shutdown on Failure of the Class Pressurizer Heaters to Be Able to Meet Their Mission Time

Re TS Required Reactor Shutdown on Failure of the Class Pressurizer Heaters to Be Able to Meet Their Mission Time

ML063320510
Person / Time
Site:	Palo Verde
Issue date:	11/16/2006
From:	Eubanks C Arizona Public Service Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
102-05595-CE/SAB/DJS LER 06-004-00
Download: ML063320510 (7)

LER-2006-004, Re TS Required Reactor Shutdown on Failure of the Class Pressurizer Heaters to Be Able to Meet Their Mission Time

Event date:
Report date:
Reporting criterion:	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) 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)(B), Prohibited by Technical Specifications
5282006004R00 - NRC Website

text

10 CFR 50.73 i

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M;-rr- ýW-'d 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 102-05595-CE/SAB/DJS November 16, 2006 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission 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 2006-004-00 Attached please find Licensee Event Report (LER) 50-528/2006-004-00 prepared and submitted pursuant to 10 CFR 50.73. This LER reports a shutdown required by Technical Specifications (TS) (10 CFR 50.73 (a)(2)(i)(A)), based on the failure of the class pressurizer heaters to meet their designed mission time. This LER is also being submitted pursuant to 10 CFR 50.73 (a)(2)(v); Any event or condition that could have prevented the fulfillment of the safety function of structures or systems that are needed to: (A) Shut down the reactor and maintain in it in a safe shutdown condition; (B) remove residual heat or (D) Mitigate the consequences of an accident.

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 PVNGS Senior Resident Inspector. If you have questions regarding this submittal, please contact James A. Proctor, Section Leader, Regulatory Affairs, at (623) 393-5730. Arizona Public Service Company makes no commitments in this letter.

Sincerely, CE/SAB/DJS/gt Attachment cc:

B. S. Mallett M. B. Fields G. G. Warnick A member of the NRC Region IV Regional Administrator NRC NRR Project Manager NRC Senior Resident Inspector for PVNGS STARS (Strategic Teaming and Resource Sharing) Alliance Callaway

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Palo Verde South Texas Project

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

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

4. TITLE TS Required Reactor Shutdown on failure of the class pressurizer heaters to be able to meet their mission time.

5. EVENT DATE

6. LER NUMBER

7. REPORT DATE

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

FACILITY NAME DOCKET NUMBER 09 18 2006 2006 - 004 -

00 11; 16 2006 05000

9. OPERATING MODE

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

El 20.2201(b)

El 20.2203(a)(3)(i)

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

E-50.73(a)(2)(vii) 1E 20.2201(d)

El 20.2203(a)(3)(ii)

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

El 50.73(a)(2)(viii)(A)

El 20.2203(a)(1)

El 20.2203(a)(4)

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

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

El 20.2203(a)(2)(i)

El 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)

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

El 50.73(a)(2)(iv)(A)

El 50.73(a)(2)(x)

[E 20.2203(a)(2)(iii)

[1 50.36(c)(2) 0 50.73(a)(2)(v)(A)

El 73.71(a)(4)

[] 20.2203(a)(2)(iv)

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

El 73.71(a)(5) 100 El 20.2203(a)(2)(v)

Z 50.73(a)(2)(i)(A)

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

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

El 50.73(a)(2)(i)(B) 0 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) ingress of magnesium oxide (heater insulation) and nickel chromium (sheath material) as contaminants into the reactor coolant system. All ASME Code required in-service inspections have been performed. An in-service leak test was performed when the unit returned to normal operating pressure and temperature.

8.

PREVIOUS SIMILAR EVENTS

In the past three years, Palo Verde reported reactor shutdowns required by Technical Specifications but none associated with the pressurizer heaters.

However, in LER 50-528/2006-002-00 APS reported a condition prohibited by Technical Specifications where Unit 1 entered Mode 3 (Hot Standby) without the required number of pressurizer heaters operable. One of the required pressurizer heaters had experienced a failure due to grounding which is the first failure of the Watlow heaters being reported in this LER (2006-004-00).