05000499/LER-2005-005, Re 125 Vdc Switchboard De-Energized Without Placing Fhb HVAC in Emergency Recirculation Mode
| ML060090290 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 12/21/2005 |
| From: | Parkey G South Texas |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NOC-AE-05001957 LER 05-005-00 | |
| Download: ML060090290 (7) | |
| 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) 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)(v), Loss of Safety Function |
| 4992005005R00 - NRC Website | |
text
Nuclear Operating Company Soth Teas Pm/d Ekct*
Ga Sn Stton POx 289 Id.M aw 77483 December 21, 2005 NOC-AE-05001957 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 2005-05, 125 VDC Switchboard De-energized Without Placing FHB HVAC in Emergency Recirculation Mode Pursuant to 10 CFR 50.73(a)(2)(i)(B), STP Nuclear Operating Company submits the attached Unit 2 Licensee Event Report 2005-05 regarding a Technical Specification (TS) violation which occurred as a result of de-energizing Class 1E 125 VDC Switchboard E2C 11 without placing the Fuel Handling Building (FHB) Heating, Ventilation, and Air Conditioning (HVAC) system in Emergency Recirculation Mode as required by TS 3.3.2 Action 30.
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 jrm/
Attachment: LER 2005-05 STI: 31969278
NOC-AE-05001957 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. O. 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 sfor each block) not conduct or sponsor, and a person is not required to respond to, the digits/characters frecblk)information collection.
- 3. PAGE South Texas Unit 2 0500049 1 OF 5
- 4. TITLE 125 VDC Switchboard De-energized Without Placing FHB HVAC in Emergency Recirculation Mode
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED SEUNTA RVFACILITY NAME DOCKET NUMBER MONTH DAY YEAR YEAR NUMBER NO.
MONTH DAY YEAR 05000 FACILITY NAME DOCKET NUMBER 10 19 2005 2005 - 005 -
00 12 21 2005 05000
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR§: (Check all that apply)
D 20.2201(b)
[
20.2203(a)(3)(i)
E 50.73(a)(2)(i)(C)
El 50.73(a)(2)(vii) 6 E 20.2201(d) 0 20.2203(a)(3)(li)
E 50.73(a)(2)(ii)(A)
[3 50.73(a)(2)(viii)(A) o 20.2203(a)(1) 0 20.2203(a)(4)
E 50.73(a)(2)(ii)(B) 0 50.73(a)(2)(viii)(B)
El 20.2203(a)(2)(;)
a 50.36(C)(1)(i)(A)
El 50.73(a)(2)(iii) 0 50.73(a)(2)(ix)(A)
- 10. POWER LEVEL El 20.2203(a)(2)(ii)
D 50.36(c)(1)(li)(A)
El 50.73(a)(2)(Iv)(A) 0 50.73(a)(2)(x)
El 20.2203(a)(2)(iii) a 50.36(c)(2)
El 50.73(a)(2)(v)(A) 0 73.71(a)(4) 0 20.2203(a)(2)(iv) 0 50.46(a)(3)(ii) 0 50.73(a)(2)(v)(B)
[I 73.71(a)(5) 000 E
20.2203(a)(2)(v) 0 50.73(a)(2)(;)(A)
E3 50.73(a)(2)(v)(C)
El OTHER 0
20.2203(a)(2)(vi) 0 50.73(a)(2)(i)(B) 03 50.73(a)(2)(v)(D)
Specify in Abstract below or in SUMMARY OF THE EVENT, INCLUDING DATES AND APPROXIMATE TIMES On October 17, 2005 at 0819 hours0.00948 days <br />0.228 hours <br />0.00135 weeks <br />3.116295e-4 months <br />, Train C FHB HVAC was declared inoperable as part of a planned C Train AC electrical bus outage, and Technical Specification 3.9.12 Action a.
(inoperable FHB HVAC train) was entered. On October 19, 2005 at 0821 hours0.0095 days <br />0.228 hours <br />0.00136 weeks <br />3.123905e-4 months <br />, Unit 2 recommenced Core Alterations after being stopped for Refueling Machine repairs. At the time Core Alterations resumed, all Technical Specifications (TS) in Section 9 'Refueling" and the applicable portion of Section 3, "Instrumentation" were being met. At approximately 0950 hours0.011 days <br />0.264 hours <br />0.00157 weeks <br />3.61475e-4 months <br />, Class 1 E 125 VDC Switchboard E2C1 1 was removed from service as part of planned outage maintenance in conjunction with irradiated fuel being moved in the Unit 2 Fuel Handling Building (FHB). The Train C FHB HVAC actuation relays are located in Relay Rack (RR) 145C and are powered from 125V DC Panel 039C, which is in turn powered from Switchboard E2C1 1. These relays require DC power to automatically place the FHB HVAC in the Emergency mode and would not have actuated with Switchboard E2C1 1 de-energized. Additionally, although Train C FHB HVAC was already inoperable per TS 3.9.12, the FHB HVAC system was not placed in Emergency Recirculation mode as required by TS 3.3.2. At approximately 1259 hours0.0146 days <br />0.35 hours <br />0.00208 weeks <br />4.790495e-4 months <br />, Switchboard E2C1 1 was returned to service.
On October 22, 2005 at approximately 2055 hours0.0238 days <br />0.571 hours <br />0.0034 weeks <br />7.819275e-4 months <br />, the night shift Atypical Condition Evaluator (a licensed Senior Reactor Operator assigned to evaluate outage activities for atypical plant conditions) identified that TS 3.3.2 Items 11 a and 11 b (FHB HVAC actuation relays) Actions 29 and 30 were not entered when E2C1 1 was de-energized on
(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) (17)
VI.
PREVIOUS SIMILAR EVENTS
There have been no previous similar Licensee Event Reports.
X.
ADDITIONAL INFORMATION
STP plans to submit a License Amendment Request which better clarifies the Mode 5 and 6 requirements for the FHB actuation relays.