05000397/LER-2013-004, Regarding Jumper Makes Suppression Pool Spray Valve Remote Transfer Switch Inoperable
| ML13231A112 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 08/01/2013 |
| From: | Hettel W Energy Northwest |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| GO2-13-110 LER 13-004-00 | |
| Download: ML13231A112 (4) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(v), Loss of Safety Function |
| 3972013004R00 - NRC Website | |
text
W. Grv HOW EP.O.
Box 968. PE23 ENPEhand WA 99-08 NORTHuWESTP. 500.377.8311 IF. 509.377.4150 August 1, 2013 G02-13-1 10 10 CFR 50.73 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001
Subject:
COLUMBIA GENERATING STATION, DOCKET NO. 50-397 LICENSEE EVENT REPORT NO. 2013-00440
Dear Sir or Madam:
Transmitted herewith is Licensee Event Report No. 2013-004-00 for Columbia Generating Station. This report is submitted pursuant to 10 CFR 50.73(aX)(2Xi)(B) and 50.73(a)(2)(v)(D).
There are no commitments being made to the NRC by this letter. ff you have any questions or require additional information, please contact Mr. J. R. Trautvetter, Regulatory Compliance Supervisor, at (509) 377-4337.
Respectfully, W. G. Hettel Vice President, Operations
Enclosure:
Licensee Event Report 2013-004-00 cc: NRC Region IV Administrator NRC NRR Project Manager NRC Senior Resident Inspector/988C A. J. Rapacz - BPN1 399 W.A. Horin - Winston & Strawn
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- 1. FACILITY NAME L DOCKETNUMBER
&PAU Columbia Generating Station 0111411?
1 OF3
- 4. TITLE Jumper makes Suppression Pool Spray Valve RemoteTransfer Switch inoperable
&. EVENT DATE F. LLER NUMIE r7.
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&EOR MW ATELM MONTH DAY YEAR YEAR SUT E
MONTH DAY YEAR FACIY NAME DOCKET NUMBER FACILIT NAME DOCKET NUMBER 08 04 2013 2013- 004- 00 0o 01 2013 m
5 23 20.2201(b) 0.2203(aX3)(1)
C] 50.73(a)2XiXC) 0 50.73(aX2)(*v) 0 20.2201(d)
Ql 20.2203(aX3)(1)
C3 50.73(a)2m)(I)(A)
E] 50.73(X2XvWIIXA)
O 20.2203 (jaX)
C3 20.22o3(aX4)
Cl S0.73(a2(,XB)
C] 50.73(aX2Xvii)(B)
E"O 20.220M(aX2XI)
E3 50.36(cXIXIXA)
[3 50.7'3()(2)()
D" S0.73(a)2)ixXA)
- 10. POWER LEVEL C] 20.220V(X2XU)
Q] 50.36(cX1X1)(A)
C3 50.73(a)2X)(,A) 13 50.73(aX2Xx) 0 C] 20.2203(aX2XIUI)
Cl 50,36(cX2)
C3 50.73(a)(2Xv)(A)
Cl 73.71(a)(4)
Cl 20.220*6(X2XIv)
C) 50.46(aX3)0I)
Q] 50.73(a)()(SX) 13 73.71(a)(5)
" 20.2203(a)2Xv) 11 50.73(aX2)(IXA) 13 50.73(a)(2xvxC) l OTHER
[' 20.220(aX2)(v)
C1 50.73(aX2XIXB)
I 50o.7(a)(2XvX)
Specify In Abstiu, below or in NRC Form 30A it 13CENSEE IONTACT FRTI E
FACILITY NAME TELEPHONE NUMBER (IncAk' Arm Code)
Diego Suarez 1 509-377-885 CAUSE_
SYSTEMCOMPONENT MANU-REPORTABLE
CAUSE
SYSTEM MANU-REPORTABLE
CAUSE
SYSTEM CO NENT FACTURER TO EPIX YSIFACTURR TO EPCX
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'"YeAR" ITON FL M__11_W YES (ff yes, compleft 15. EXPECTED SUBMSSIONA ATE)
Cl NO 9
20 2013 DAT ABSTRACT (umit to 14oo spaces, i.e., apprmately 15 singre-paced typewrten ines)
When performing a logic system functional test (LSFT) of the Remote Shutdown Panel transfer switch [J$S during refueling outage R121 on June 4, 2013, the procedure for testing the remote transfer switch for the suppression pool spray valve [ISVJ failed because a jumper [57] had been left Installed following a new bucket (breaker) installation at the Motor Control Center [MCC] during the previous refueling outage R20. A satisfactory LSFT was peuformed prior to the installation of the new bucket into the MCC but this LSFT was not re-performed to verify the operability of the new bucket after installation. The problem went undetected until the R21 LSFT test failed. The remote transfer switch was inoperable from May 16, 2011 until June 4, 2013 when the condition was discovered. This resulted In failure to meet Surveillance Requirement (SR) 3.3.3.2.4 and non-compliance with Technical Specifications (TS) Umiting Condition for Operation (LCO) 3.3.3.2.
The preliminary apparent causes have been Identified as: (1) a lack of a standard for Work Order instructions involving the removal and installation of jumpers, resulting in personnel having to rely on experience and skill of the craft for the proper way of executing and documenting required modifications; and (2) Inadequate decision making resulting In the use of a post maintenance testing procedure after the installation of the Spectrum bucket In May 2011 that did not adequately prove operability.
26158 85
NC FOIR 0A UAL NUCLEMi IRLWATOY COUMUS (10-2010)
UCEtSE EVENT REPORT (LER)
COWNTIATIO SHEIET YEAR SEQUOENTIAL REV Columbia Generating Station 000039 NUMeR -
NO.
2 OF 3 I
2013- 004 -00
NARRATIVE
PLANT CONDITIONS
The event was discovered June 4, 2013 when a logic system functional test (LSFT) of the Suppression Pool Remote Transfer Switch [JS) failed. The plant was In Mode 5 during refueling outage R21 with the reactor mode switch in Refuel.
EVENT DESCRIPTION
On 6/04/2013, during performance of surveillance procedure on the control power transfer switch [JSJ located in the Remote Shutdown Panel, a step to vertfy no continuity (contacts open) for the transfer switch for the suppression pool spray valve RHR-V-278 [ISV] failed. Failure of the surveillamne was attributed to a jumper [5I7 installed (as-found) in 480V Motor Control Center [MCC) starter controls contained In the new bucket. The jumper had been left In place since refueling outage R20 when the Spectrum bucket (breaker) was Installed on May 16, 2011. The transfer switch was, therefore, inoperable since the jumper was left in place, because Surveillance Requirement 3.&3.2.4 under Technical Specifications (TS) Limiting Condition for Operation (LCO) 3.3.3.2, The Remote Shutdown System Functions Shall Be Operable, would not have been met when in Modes I or 2.
IMMEDIATE CORRECTIVE ACTION
The jumper was removed and the loosened terminals were torqued to restore bucket to design configuration.
CAUSE
The Cause Evaluation Identified preliminary apparent causes of this event as follows: (1) a lack of a standard for Work Order instructions involving removal and installation of jumpers, which requires personnel to rely on experience and skill of the craft for the proper way of executing and documenting required modifications; and (2) inadequate decision making resulting in the use of a post maintenance testing procedure after the Installation of the Spectrum bucket In May 2011 that did not adequately prove operability.
FURTHER CORRECTIVE ACTION Procedures will be revised to provide additional level of detail for work order steps involving determination and termination of wires, cables and jumpers.
Additional corrective actions are being investigated that may result in additional proposed corrective measures. A supplement to this Licensee Event Report will be submitted if the final corrective action plan Is substantively different than that Included In this form.
ASSESSMENT OF SAFETY CONSEQUENCES
The remote transfer switch is located at the Remote Shutdown Panel. The switch transfers control of the Division 2 suppression pool spray valve from the Main Control Room to the Remote Shutdown Panel and vice versa. The suppression pool spray valve is used to provide cooling to the wetwell portion of the primary containment as a means to control containment pressure during an accident.
The jumpered terminals in the remote shutdown transfer switch did not impact the operation of the suppression pool spray valve from the Main Control Room.
With the jumper left in place the operation of the suppression pool spray valve could be impacted from the Remote Shutdown Panel because of loss of starter control power for valve RHR-V-27B under some abnormal scenarios (i.e., fire in the Main Control Room), which would require the replacement of a blown fuse prior to being able to operate the valve from the Remote Shutdown Panel. However, the normal position for this valve is closed and it would not normally be 26158 R5
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2013-004O
- - 0 NARRATIVE operated from the Remote Shutdown Panel in the event of a fire In the Control Room. Therefore the safety significance of this failure Is low.
SIMILAR EVENTS
There are several documented conditions with similar clzumstance Involving improper removal or installation of jumpers.
However, they were due to Improper placement or removal of jumpers and did not Involve jumpers being left In for an extended period of time.
ENERGY INDUSTRY IDENTIFICATION SYSTEM (els) INFORMATION CODES EIIS codes are bracketed a where applcable in the narrative.
26158 R5