05000010/LER-1997-001-06, :on 970210,120 Volt Circuit Breaker Supplying Alternate Iodine & Particulate Sampling Sys Tripped.Caused by Mgt Deficiency.Disconnected Auxiliary Loads,Restricted Use of Outlets & Verified Continued Sys Operation
| ML20136G240 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 03/12/1997 |
| From: | Quealy P COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML20136G238 | List:
|
| References | |
| LER-97-001-06, LER-97-1-6, NUDOCS 9703170245 | |
| Download: ML20136G240 (5) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2) 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(viii)(A) 10 CFR 50.73(a)(2)(1) 10 CFR 50.73(a)(2)(ii) 10 CFR 50.73(a)(2)(x) 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 0101997001R06 - NRC Website | |
text
.
m i
WRC FORM 366 U.S. CICLEAR REGULATCC7 COBGilSSION APPROVED BY OMB NO. 3150 0104 (5 92)
EXPIRES 5/31/95 4
EST! MATED BURDEN PER RESPONSE TO COMPLY WITH j
LICENSEE EVENT REPORT (LER)
M An'o" E 30"
,$ RE RDIN BUR EN $I TE 5 THE INFORMATION AND RECORDS MANAGEMENT BRANCH (MNBB 7714), U.S. NUCLEAR REGULATORY COMMISSION, WASHINGTON, DC 20555-0001 AND To THE PAPERWORK REDUCTION PROJECT (31$00104), OFFICE OF MANAGEMENT AND BUDGET, WASHINGTON, DC 20503.
J FACILITY NAME (1)
DOCKET NUMBER (2)
PAGE (3) j Dresden Nuclear Power Station, Unit 1 05000010 1 of 5 l
TITLE (4)Loss of the Main Chimney Alternate Iodine and Particulate Sampling System due to a breaker trip caused by an apparent management deficiency.
EVENT DATE (5)
LER NUMBER (6)
REPORT DATE (7)
OTHER FACILITIES INVOLVED (8)
MONTH DAY YEAR YEAR MONTH DAY YEAR toe E
M M NAME j
02 10 97 97 001 00 03 12 97 D O ET M BER
)
]
OPERATING HI M
MIM N
N R
N OF 10 C R b p ek w or more) W N
MODE (9) 20.2201(b) 20.2203(a)(3)(1) 50.73(a)(2)( t i i) 73.71(b) i
~
20.2203(a)(1) 20.2203(a)(3)(ii) 50.73(a)(2)(tv) 73.71(c) 4 pg, 000 LEVEL (10) 20.2203(a)(2)(i) 20.2203(a)(4) 50.73(a)(2)(v)
OTHER 20.2203(a)(2)(ii) 50.36(c)(1) 50.73(a)(2)(vii)
(Specify in 20.2203(a)(2)(iii) 50.36(c)(2) 50.73(a)(2)(viii)(A) 1 20.2203(a)(2)(iv)
X 50.73(a)(2)(1) 50.73(a)(2)(vill)(B)l i
20.2203(a)(2)(v) 50.73(a)(2)(ii) 50.73(a)(2)(x)
LICENSEE CONTACT FOR THIS LER (12)
NAME TELEPHONE NUMBER (include Area Code)
P. Quealy, Health Physics Supervisor Ext. 2492 (815) 942-2920
)
COMPLETE ONE LINE FOR EACH COMPONENT FAILURE DESCRIBED IN THIS REPORT (13)
L
CAUSE
SYSTEM COMPONENT MANUFACTURER
CAUSE
SYSTEM COMPONENT MANUFACTURER OS 0
S 1
l SUPPLEMENTAL REPORT EXPECTED (14)
EXPECTED MONTH DAY YEAR 1
YES SUBMIS$10N X
NO (If yes, complete EXPECTED SUBMISSION DATE).
DATE (15) 4
}
ABSTRACT (Limit to 1400 spaces, i.e., approximately 15 single spaced typewritten lines) (16)
I With Unit 1 defueled, the Main chimney Monitoring System was removed from service for calibration and the Alternate Iodine and Particulate Sampling System was placed in service. At approximately 1430, on February 10, 1997, the 120 volt circuit breaker supplying the Alternate Iodine and Particulate Sampling i
System tripped.
Upon discovery, at approximately 1055 on February 11, 1997, the 4
system was restored to operation.
The cause of this event is an apparent management deficiency of the installation process which allowed the Alternate Iodine and Particulate Sampling System to utilize the uncontrolled 120 volt j
circuit.
Immediate corrective actions included disconnecting the auxiliary i
loads, restricting use of the outlets connected to the 120 volt circuit, and J
performing a surveillance to verify continued system operation. These immediate corrective actions will continue until permanent changes are implemented.
No j
previous occurrence of this event has been identified, e
l 9703170245 970310 PDR ADOCK 05000010 S
PDR a
L:\\8360\\0101\\0101180\\97\\001 OUIU '73 W I 5
_~
~
!U.S. CUCLEAR REGULATORY CCMISSION APPROVED BY OMB No. 3150-0104 1
(5 92)
EXPIRES 5/31/95 I
4 ESTIMATED BURDEN PER RESPONSE TO COMPLY WITH i
THIS INFORMATiON COLLECil0N REQUEST: 50.0 HRS.
FORWARD COMMENTS REGARDING BURDEN ESTIMATE TO LICENSEE EVENT REPORT (LER)
THE INrORMATION ANo RECORoS MANAGEMENT BRANCH j
TEXT CONTINUATION (MNBB M 4), U.S. NUCLEAR REGULATORY COMMISSION, l
l WASHINGTON, DC 20555-0001 AND TO THE PAPERWORK
)
REDUCTION M0 JECT (31$0-0104),
OFFICE OF MANAGEMENT AND BUDGET. WASHINGTON. DC 20503.
j FACILITY NAME (1)
DOCKET NUM8ER (2)
LER NUMBER (6)
PAGE (3)
SEQUENTIAL REVISION YEAR NWBER NUMBER Dresden Nuclear Power Station, Unit 1 05000010 2 OF 5 97
-- 001 --
00 EXV(Ifmorespaceisrequired,useadditionalcopiesofNRCForm366A) (17) l 1
)
J
PLANT AND SYSTEM IDENTIFICATION
l l
General Electric - boiling water reactor - 700 MWt rated core thermal power.
}
Energy Industry Identification System (EIIS) codes are identified in the text as [XX] and are obtained from IEEE Standard 805-1984, IEEE Recommendation Practice l
for System Identification in Nuclear Power Plants and Related Facilities.
1 EVENT IDENTIFICATION:
I j
Loss of the Main Chiuney Alternate Iodine and Particulate Sampling System due to a breaker trip caused by an apparent management deficiency.
A.
PLANT CONDITIONS PRIOR TO EVENT:
Unit:
1 Event Date:
02/10/97 Event Time:
1430 hrs Reactor Mode:
N Mode Name: N Power Level: N Reactor Coolant System Pressure: N psig B.
DESCRIPTION OF EVENT
}
This LER is being submitted pursuant to 10 CFR 50.73(a) (2) (i) (B) which requires 2
the reporting of any operation or condition prohibited by the plant's Technical l
Specifications.
Unit 1 has been shutdown since October 31, 1978.
i l
The original, circa 1959, and current Dresden Unit 1 Technical Specifications i
surveillance requirement 4.8 specify continuous air monitor samples from the i
Main Chimney.
It is believed that the Alternate Iodine and Particulate Sampling 4
System [IL) always utilized a cord and plug connection from a 120 volt circuit [EC}.
Prior to February 10, 1997, four temporary lighting strings were connected to 1
outlets on the 120 volt circuit also utilized for the Alternate Iodine and j
Particulate Sampling System.
These lighting strings are utilized for routine maintenance and cleanup activities in the area.
At approximately 1020, on February 10, 1997, a Radiation Protection Technician i
(non-licensed) removed the Main Chimney Monitoring System from service for calibration and placed the Alternate Iodine and Particulate Sampling System in service, as required by Technical Specification surveillance requirement 4.8.
The Alternate Iodine and Particulate Sampling System is powered by an attached cord and plug which was connected to an outlet on a 120 volt circuit in the Unit 1 Turbine Building.
The 120 volt circuit feeds a total of four outlets.
During the start up of the Alternate Iodine and Particulate Sampling System, the breaker for the 120 volt circuit was found tripped.
The breaker was reset and operation of the system was observed for approximately 10 minutes.
l 1.t \\ 0 360\\ $301\\ 010\\ l 40\\ 9h 001 03/10/ 9h 150 3
-.. ~
.~
._U.S. NUCLEAR REGULATORY C0pellSSION APPROVED BY OM8 No. 3150-0104 (5 92)
EXPIRES 5/31/95 i
ESTIMATED BURDEN PER RESPONSE TO COMPLY WITH THIS INFORMATION COLLECTION REQUEsil 50.0 HRS.
FORWARD COMMENTS REGARDING BURDEN ESTIMATE To j
LICENSEE EVENT REPORT (LER)
THE INFORMATION AND RECORDS MANAGEMENT BRANCH TEXT CONTINUATION (MN88 U14), U.S. NUCLEAR REGULATORY COMMISSION, WASHINGTON, DC 20555 0001 AND TO THE PAPERWORK REDUCTION PROJECT (31$00104), OFFICE OF MANAGEMENT AND BUDGET. WASHINGTON. DC 20503.
]
FACILITY NAME (1)
DOCKET NUM8ER (2)
LER NUMBER (6)
PAGE (3)
SEQUENTIAL REVISION YEAR NW8E R NW8ER Dresden Nuclear Power Station, Unit 1 05000010 3 OF 5 97
-- 001 --
00 l
TEXT (if more space is required, use additional copies of NRC Form 366A) (17) i At approximately 1430, on February 10, 1997, Instrument Maintenance Technicians (non-licensed) were performing calibration activities on the Main Chimney Monitoring System and noticed that the Alternate Iodine and Particulate Sampling j
System Motor stopped running. This was not reported since the technicians j
believed that the motor was designed to cycle off and on.
i l
At approximately 1055, on February 11, 1997, a chemistry Technician (non-licensed) was taking daily grab samples from the Main Chimney.
The Chemistry Technician discovered that the Alternate Iodine and Particulate Sampling System was not operating and that the 120 volt breaker supplying the system had tripped j
rendering the system inoperable. The Chemistry Technician immediately reset the i
120 volt breaker, restored the Alternate Iodine and Particulate Sampling System to operation, and notified the operacions Department Shift Manager (Licensed Senior Reactor operator (SRO).
4 on February 11, 1997, the Radiation Protection and Engineering departments initiated an investigation into the cause of the circuit breaker trip.
At approximately 1900, on February 11, 1997, Radiation Protection initiated a surveillance on the operation of the Alternate Iodine and Particulate Sampling l
System. This surveillance is performed approximately every four hours when the system is in service.
On February 12, 1997, Unit 1 Construction and Engineering personnel opened the Lighting Panel housing the 120 volt breaker and identified that the breaker supplied two wires. Measurements indicated that both wires were carrying loads.
The first wire was connected directly to the outlet being utilized for the
- ^
Alternate Iodine and Particulate Sampling System. The second wire was connected to an outlet outside of the local area and was feeding four lighting strings.
The lighting strings were disconnected, and no load could be detected on the i
second wire.
Based on this information, an overload condition on the 120 volt
~
circuit was the suspected cause of the circuit breaker trip.
On February 12, 1997, Unit 1 Construction labeled the outlets known to be connected to the 120 volt breaker to prevent them from being utilized for equipment other than the Alternate Iodine and Particulate Sampling System.
Additionally, the outlet for the Main Chimney Monitoring System, supplied from the Unit 3 Instrument Bus (EF], Panel 903-50, was labeled to prevent it from being utilized for other equipment.
On February 14, 1997, Engineering completed an evaluation to determine if any other outlets or components were fed from the second wire.
This evaluation concluded that two additional outlets were connected to the 120 volt circuit.
Construction labeled these outlets to prevent them from being utilized for equipment other than the Alternate Iodine and Particulate Sampling System.
on February 16, 1997, Unit 1 Engineering completed an evaluation of the loads on
+
the 120 volt circuit. This evaluation concluded that the Alternate Iodine and Particulate Sampling System and auxiliary loads created an overcurrent condition i
resulting in the 120 volt circuit breaker tripping at approximately its design trip setting.
1 4
1,t \\ 9 344; t 30 ti o10\\190i 9 h eol 03/10/97:1503
. - - _ ~ ~ ~ ~
~. ~ ~
t NRC FORD 366A U.S. C2) CLEAR REGULATORY COMISSION APPROVED BY OMB NO. 3150-0104 d
15 92)
EXPIRES 5/31/95 4
ESilMATED BURDEN PER RESPONSE TO COMPLY WITH THIS INFORMATION COLLECTION REQUEST: 50.0 HRS.
FORWARD COMMENTS REGARDING BURDEN ESTIMATE TO LICENSEE EVENT REPORT (LER)
THE INFORMATION Awo RECORDS MANAGEMENT BRANCH TEXT CONTINUATION (MN88 m ), U.S. NUCLEAR REGULATORY COMMISSION, WASHINGTON, DC 20555 0001 AND TO THE PAPERWORK 4
REDUCTION PROJECT (31$0-0104),
OFFICE OF MANAGEMENT AND BUDGET, WASHINGTON, DC 20503.
FACILITY NAME (1)
DOCKET NUMBER (2)
LER NUM8ER (6)
PAGE (3) i SEQUENTIAL REVISION YEAR
"*8 E '
"* 8 ' "
Dresden Nuclear Power Station, Unit 1 05000010 4 OF 5 97
-- 001 00 TEXT (If more space is required, use additional copies of NRC Form 366A) (17)
Therefore, the overcurrent condition on the 120 volt circuit resulted in the loss of Main Chimney Iodine and Particulate monitoring for approximately twenty-
]
one hours, contrary to Technical Specification surveillance requirement 4.8.
C.
CAUSE OF EVENT
The cause of this event is an apparent management deficiency of the installation r
l process which allowed the Alternate Iodine and Particulate Sampling System to utilize the uncontrolled 120 volt circuit (NRC cause code E, Management / Quality i
Assurance Deficiency). When the need to have an Alternate Iodine and Particulate Sampling System was identified, it is not apparent that an adequate administrative process existed to control the installation. As a result, no formal controls were identified and multiple auxiliary loads were connected to 1
i the 120 volt circuit resulting in an overcurrent condition and circuit breaker i
trip.
D.
SAFETY ANALYSIS
i The 120 volt breaker trip resulteJ in the loss of Main Chimney Iodine and Particulate monitoring for approximately twenty-one hours.
During this time period, work activities in areas utilizing this effluent release path consisted of routine maintenance and cleanup.
These types of activities have historically d
i not resulted in appreciable effluent releases. The Unit 1 Fuel Building is the j
main contributor to the Main Chimney effluent path. The Unit 1 Fuel Building SPING was operable during the time period that the Alternate Iodine and j
Particulate Sampling System was off line.
Isotopic analyses of data from the l
Fuel Building SPING during this time period identified no indications of radionuclide discharge.
Isotopic analyses of data from the Main Chimney 1
Sampling Systems prior to and following the time period that the Alternate Iodine and Particulate Sampling System was off line identified no indications of j
radionuclide discharge.
For the year 1996, Main Chimney iodine and particulate j
sampling indicated no significant effluent release.
The only remaining accident scenarios of concern for Unit 1 involve the fuel stored in the Unit 1 Fuel Pool and Transfer Pool.
Previous conservative i
accident analyses performed for Dresden Unit 1 demonstrate that postulated Fuel Pool accidents will not result in off-site dose exposures in excess of 10 CFR 100 or US EPA limits. The Unit 1 Main Chimney Exhaust System which allows for an elevated release of effluents remained in service during the time period that the Alternate Iodine and Particulate Sampling System was off line.
Based on the above, the overall safety significance of this event is minimal.
La \\ 9 360' R 3014 0lo\\ i so\\ 9h 001 03/10/97 1503
.-- ~ -.
.. ~.
,U.S. NUCLEAR REGULATORY COMMISSIC^3 APPROVED BY OM8 NO. 3150 0104 (5 93)
EXPIRES 5/31/95 I
ESTIMATED 8URDEN PER RESPONSE TO COMPLY WITH THIS INFORMATION COLLECTION REQUEST: 50.0 HRS.
]
FORWARD COMMENTS REGARDING 8URDEN ESTIMATE 10 LICENSEE EVENT REPORT (LER)
THE INFORMATION AND RECORDS MANAGEMENT BRANCH TEXT CONTINUATION (Muss 7714), U.S. NUCLEAR REGULATORY COMMISSION, WASHINGTON, DC 20555 0001 AND TO THE PAPERWORK j
REDUCTION PROJECT (31$00104), OFFICE OF 4
MANAGEMENT ANO SUDGET. WASHINGTON, DC 20503.
i FACILITY NAME (1)
DOCKET NUMBER (2)
LER NUMBER (6)
PAGE (3)
SEQUENTIAL REVISION
{
YEAR NUMBER NUMBER l
Dresden Nuclear Power Station, Unit 1 05000010 5 OF 5 97
-- 001 --
00 l
TEXT (If more space is required, use additional copies of NRC form 366A) (17)
J l.
E.
CORRECTIVE ACTIONS
)
1.
The 120 volt circuit has been dedicated to powering the Alternate Iodine i
and Particulate Sampling System. This load has been verified to be well within the design trip setting of the circuit. This action precludes the need for routine surveillances during future operation of the Alternate 4
Iodine and Particulate Sampling System. (Complete) 1
?
2.
The 120 volt circuit outlets have been labeled to prevent them frorr being used for equipment other than the Alternate Iodine and Particulate Sampling System. Additionally, the outlet for the Main Chimney Monirdring System, supplied from the Unit 3 Instrument Bus 903-50, was labeled to prevent it from being utilized for other equipment. (Complete) 3.
Dresden Station will implement permanent changes in the design of the 120 volt power supply for the Alternate Iodine and Particulate Sampling System to prevent a similar occurrence. (NTS 010-180-97-00101) 4.
Dresden Station will review the design of power supplies for Safety Related, Technical Specification required, or Dresden Administrative Technical Requirement required components to verify that the circuits do not contain outlets that are susceptible to overload due to uncontrolled loads. The first priority of this review will include effluent and radiation monitoring components that have been added since original construction. (NTS 010-180-97-00102, NTS 010-180-97-00104) 5.
Dresden Station will review the design control process to validate that adequate measures exist to prevent Safety Related, Technical Specification related, or Dresden Administrative Technical Requirement related components from being designed to operate from circuits with uncontrolled power outlets. (NTS 010-180-97-00103)
F.
PRIOR SIMILAR OCCURRENCES:
LER/ Docket Numbers Title 96-021/05000237 Failure to Declare Refuel Floor Radiation Monitor Inoperable and Take Technical Specifications Required Action Due to Inadequate 10CFR50.59 Safety Evaluation LER 96-021/05000237 is similar to LER 97-001/05000010 in that it involves powering a component required by Technical Specifications from a non-safety related power supply.
However, corrective actions for LER 96-021/05000237 would not have prevented this occurrence.
G.
COMPONENT FAILURE DATA
There were no component failures.
The 120 volt circuit breaker tripped on an overcurrent condition at approximately its design trip setting.
Lt\\9140\\01014010)100197\\001 01/10/ 9h 150)