05000529/LER-2004-003, Regarding Actuation of Plant Emergency Diesel Generators
| ML050630279 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 02/22/2005 |
| From: | Danni Smith Arizona Public Service Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 192-01159-DMS/RAS LER 04-003-00 | |
| Download: ML050630279 (9) | |
| 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) 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 |
| 5292004003R00 - NRC Website | |
text
I I-AF A subsidianr ofPimiacke BIevt Capital Curprration Palo Verde Nuclear 1 OCFR50.73 Generating Station David M. Smith Plant Manager Nuclear Production Tel.
623-393-6116 Fax.
623-393-6077 e-mail: DSMITH10@apsc.com Mail Station 7602 P.O. Box 52034 Phoenix, AZ 85072-2034 192-01159-DMS/RAS February 22, 2005 ATTN: Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555-0001
Dear Sirs:
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Units 2 and 3 Docket No. STN 50-529, 50-530 License No. NPF 51, NPF 74 Licensee Event Report 2004-003-00 Attached please find Licensee Event Report (LER) 50-529/2004-003-00 prepared and submitted pursuant to 10 CFR 50.73. This LER reports an event resulting in the actuation of Unit 2 and 3 emergency diesel generators.
In accordance with 10 CFR 50.4, a copy of this LER is being forwarded to the NRC Region IV Office 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.
Arizona Public Service Company makes no commitments in this letter.
Sincerely, DMS/ras iiZ3:-k A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway
- Comanche Peak
- Diablo Canyon
- Palo Verde
- South Texas Project
- Wolf Creek
X U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Licensee Event Report 50-529/2004-003-00 Page 2 Attachment cc:
B. S. Mallet, Region IV Administrator G. G. Warnick, Sr. Resident Inspector M. B. Fields, PVNGS Project Manager (all w/attachment)
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY 0MB: NO. 3150-0104 EXPIRES: 06/3012007 (6-2004)
, the NRC may sfor each block) not conduct or sponsor, and a person Is not required to respond to, the digits/characters frecblk)Information collection.
- 3. PAGE Palo Verde Nuclear Generating Station (PVNGS) Unit 2 05000529 1 OF 7
- 4. TITLE Actuation of Unit 2 and 3 Emergency Diesel Generators
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED I
FACILITY NAME DOCKET NUMBER MONTH DAY YEAR YEAR NUMBER A RE MONTH DAY YEAR PVNGS Unit 3 05000530 N
FACILITY NAME DOCKET NUMBER 12 31 2004 2004 - 003 -
00 02 22 2005
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR§: (Check all that apply) o 20.2201(b)
D 20.2203(a)(3)(i)
El 50.73(a)(2)(i)(C) 0 50.73(a)(2)(vii) 1 0 20.2201(d) 0 20.2203(a)(3)(ii)
El 50.73(a)(2)(ii)(A)
El 50.73(a)(2)(viii)(A) o 20.2203(a)(1) 0 20.2203(a)(4) 0 50.73(a)(2)(ii)(B) 0 50.73(a)(2)(viii)(B) 0O 20.2203(a)(2)(i)
E 50.36(c)(1)(i)(A)
El 50.73(a)(2)(iii)
D 50.73(a)(2)(zx)(A)
- 10. POWER LEVEL El 20.2203(a)(2)(ii) 0 l 50.36(c)(1)(ii)(A)
El 50.73(a)(2)(iv)(A)
El 50.73(a)(2)(x)
El 20.2203(a)(2)(iii) 0 50.36(c)(2)
El 50.73(a)(2)(v)(A)
El 73.71(a)(4) o 20.2203(a)(2)(iv)
El 50.46(a)(3)(ii)
El 50.73(a)(2)(v)(B)
Dl 73.71(a)(5) 100 El 20.2203(a)(2)(v) 0 50.73(a)(2)(i)(A) 0 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 (If more space is required, use additional copies of NRC Fonr 366A)
- 1.
REPORTING REQUIREMENT(S)
Pursuant to 10 CFR 50.73(a)(2)(iv)(A), this LER reports an event that resulted in the valid automatic actuation of one of the Unit 2 and one of the Unit 3 emergency diesel generators (EDGs) [EIIS Code: EB].
Pursuant to 10 CFR 50.72(b)(3)(iv)(A), Arizona Public Service Company (APS) made notification of this event to the NRC Headquarters Operations Officer on December 31, 2004 (reference ENS 41304).
- 2.
DESCRIPTION OF EVENT RELATED STRUCTURE(S), SYSTEM(S) AND COMPONENT(S):
Utility Grid System [EIIS Code: FK]
The Palo Verde Nuclear Generating Station (PVNGS), is connected through the PVNGS switchyard (transmission system) to the Arizona-New Mexico-California-Southern Nevada extra high voltage (EHV) grid which is interconnected to other EHV systems within the Western System Coordinating Council (WSCC). (See section 10. OTHER INFORMATION, for a simplified diagram of the Palo Verde switchyard.)
Onsite Power System [EIIS Codes: EA, EB, EC & PB]
Offsite sources of power provide preferred power to the three units through the secondary windings of three startup transformers. The onsite power system of each unit is divided into two separate systems: the non-Class 1 E power system and the Class 1 E power system which is divided into two separate load groups. Power is supplied to the auxiliaries at 13.8 kV, 4.16 kV, and 480V levels. The onsite power system includes the Class 1 E power system which provides auxiliary ac and dc power for equipment used to shut down the reactor safely following a design basis event. The Class 1 E busses of each unit must be energized in order to provide preferred or standby power to the safety-related loads of each unit.
(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 Fonn 366A)
- 8.
CORRECTIVE ACTIONS
Since this event was caused by personnel and circumstances outside of direct control of PVNGS management, "correctable opportunities" were identified in lieu of corrective actions. The correctable opportunities are:
- 1.
Improve communication between Palo Verde, ECC, and Substation personnel to identify abnormal conditions that could negatively impact Palo Verde during certain work activities.
- 2.
Identify work on extra high voltage (EHV) rated equipment that could negatively impact Palo Verde as "sensitive" to alert workers of a need for heightened awareness.
- 3.
Implement a requirement for "flagging" to be used when working in areas of similar or identical equipment to assist the worker in properly identifying equipment.
- 4.
Implement a requirement for two-party "concurrent verification" for work on EHV rated equipment that could negatively impact Palo Verde
- 9.
PREVIOUS SIMILAR EVENTS
Switchyard and EHV grid events that have affected PVNGS have been reported in LERs 50-528/2004-006-00 and 50-530/2003-004-00. However, these previous events or conditions did not involve the same underlying concern or reason as this event, such as the same root cause, failure, or sequence of events. There have been no previous similar events in the past three years that had a similar failure mechanism or that should have prevented this event from previously implemented corrective actions.
(If more space is required, use additional copies of NRC Form 366A)
- 10. OTHER INFORMATION:
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