LER 79-052-00 for Dresden 2 Regarding an Incident Where Fire Water Accumulated on the Mezzanine Floor Which Then Ran Down Into the U2 D/G Control Cabinet Via the D/G Room Vent Ductwork, Causing the Diesel Auto Start Block Alarm| ML17252B559 |
| Person / Time |
|---|
| Site: |
Dresden  |
|---|
| Issue date: |
10/18/1979 |
|---|
| From: |
Commonwealth Edison Co |
|---|
| To: |
NRC/RGN-III |
|---|
| References |
|---|
| LER 79-052-00 |
| Download: ML17252B559 (1) |
|
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|---|
Category:Licensee Event Report (LER)
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05000249/LER-2016-0012016-08-25025 August 2016
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05000237/LER-2016-0022016-07-15015 July 2016
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05000237/LER-2016-0012016-04-0808 April 2016
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05000249/LER-2015-0012016-01-22022 January 2016
Main Steam Line Flow Switches Found Outside Tech Spec Allowed Value, LER 15-001-01, Dresden, Unit 3 Main Steam Line Flow Switched Found Outside Tech Spec Allowed Value
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Letter LS-AA-1 25-1001, Elevated Tritium Values Identified in 2 Storm Drains Due to Through-Wall Leaks in Underground Piping for Dresden Units 2 and 3.
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Final Precursor Analysis - Dresden Unit 3 - Unit 3 Scram Due to Loss of Offsite Power and Subsequent Inoperability of the Standby Gas Treatment System for Units 2 and 3
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LER 89-029-05, Dresden Unit 2, Elevated HPCI Discharge Piping Temperature Due to Reactor Feedwater System Back Leakage
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ML17252B5291981-03-23023 March 1981
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ML17252B5321981-02-17017 February 1981
LER 81-070/03L for Dresden, Unit 2 Re While Conducting Steam Line Area Temperature Switch Calibration Surveillance, Temperature Switch TS 2-261-180 Failed to Trip
ML17252B5331981-02-0202 February 1981
LER 81-020/03L-0 for Dresden, Unit 2 Re During Refueling Outage LPCI Test Spray Valve Failed to Shut Electrically, One Set of Thermal Contacts Would Not Reset
ML17252B5341981-01-23023 January 1981
LER 80-049/03L-0 for Dresden, Unit 2 Re at Completion of Secondary Containment Leak Rate Test the Reactor Building Ventilation Isolation Valve 2A-5742 Would Not Open
ML17252B5351981-01-23023 January 1981
LER 80-050/03L-0 for Dresden, Unit 2 Re the 1501-62D Pressure Switch Actuated at 44.2 Inches of Water Increasing, Tech. Spec. Limit Is Less than or Equal to 41.6 Inches of Water Increasing
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LER 80-046/03L-0 for Dresden, Unit 2 Re Conditions Leading to on Operation in a Degraded Mode Permitted by a Limiting Condition for Operation or Plant Shutdown Required by a Limiting Condition for Operation
ML17252B5381980-12-0303 December 1980
LER 80-043/03L-0 for Dresden, Unit 2 Re Surveillance Testing of the Condenser Low Vacuum Switches, Pressure Switch 2-503D Was Found to Have a Trip Point of 22.85 Inches Hg
ML17252B5421980-11-12012 November 1980
LER 80-042/03L-0 for Dresden, Units 2 and 3 Re That Technical Staff Personnel Revealed That the Ultrasonic Testing of the Scram Discharge Volume Was Not Performed During the 1500-2300 Shift
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ML17252B1841980-10-31031 October 1980
LER 80-40/01T-0 for Dresden Unit 3 Regarding Failure of the HPCI Inboard Steam Supply Valve to Open
ML17252B5441980-10-29029 October 1980
LER 80-039/03X-1 for Dresden, Unit 2 Re HPCI Inboard Steam Supply Valve Opened and Had a Dual Light Indication
ML17252B5451980-10-23023 October 1980
LER 79-017-01X2 for Dresden, Units 2 and 3 Re Inadequacies Observed in Implementation of Administrative Procedural Controls Which Threaten to Cause Reduction of Degree of Redundancy Provided in Reactor Protection System or Engineered Safety
ML17252B5461980-10-0808 October 1980
LER 80-016/01T-1 for Dresden, Unit 2 Re While Shutdown and Conducting 300 Psi Primary System Hydrostatic Leak Inspection, Water Discovered Dripping from LPCI Check Valve Up Stream Drain Line
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LER 80-036/03L-0 for Dresden, Unit 2 Re Discovery That the Six Month Functional Test Required by Tech. Spec. 4.12.A.1 of the Cardox System Heat Detectors Was Not Performed within the Allowable Surveillance Interval
ML17252B5481980-10-0101 October 1980
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ML17252B1861980-08-22022 August 1980
LER 80-032/03L-0 for Dresden Unit 3 Regarding During Normal Operations While Performing APRM Rod Block and Scram Functional Tests, APRM 3 Failed to Initiate a Rod Block
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LER 80-027/03L-0 for Dresden, Unit 2 Re Dropping Load in Preparation for I.E.B. 80-17 Scram Tests, Low Level of Diesel Generator Coolant Present in the Water Tank Was Noticed by Equipment Operator
ML17252B5161980-08-14014 August 1980
LER 80-024/03L-0 for Dresden, Unit 2 Re Drywell Oxygen Concentration Indication Failed Downscale in Violation of Tech. Spec. 3.7.A.6.d
ML17252B1881980-08-0404 August 1980
LER 80-030/03L-0 for Dresden Unit 3 Regarding While Reducing Power for Manual Scram Required by I.E. Bulletin 80-17, Routine Surveillance of MSIV Closure Times Showed That MSIVs 3-203-2B and 2D Closed in Less than 3 Seconds
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LER 80-024/03L-0 for Dresden Unit 3 Regarding During Normal Operation with Reactor Level Instrument Surveillance in Progress, Level Switch LIS 3-263-58AB Tripped at Less than Tech. Spec. Limit of 84 Inches
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LER 80-023/03L-0 for Dresden Unit 3 Regarding During Normal Operation with Reactor Level Instrument Surveillance in Progress, Level Switch LIS 3-263-58A Tripped at Less than Tech. Spec. Limit of 144 Inches
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LER 80-025/03L-0 for Dresden Unit 3 Regarding During Normal Operation While Performing Main Steam Line High Flow Isolation Surveillance, Flow Switch DPIS 3-261-2A Was Out of Tech. Spec. Limits, Table 3.2.1
ML17252B5521980-06-0505 June 1980
LER 80-017/03L-0 for Dresden, Unit 2 Re Double Valve Indication Was Observed on the HPCI Inboard Isolation Valve. Upon Trying to Cycle the Valve, the Valve Failed to Close
ML17252B1931980-06-0303 June 1980
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ML17252B5531980-05-27027 May 1980
LER 80-015/03L-0 for Dresden, Unit 2 Re During Steady State Operation, Torus to Drywell Vacuum Breaker 2-1601-33A Was Found Inoperable During Routine Operability Surveillance
ML17252B1941980-05-27027 May 1980
LER 80-022/03L-0 for Dresden Unit 3 Regarding During Normal Shutdown Conditions, IRM 12 Downscale Rod Block Was Found to Trip at 4/125
ML17252B1951980-05-0808 May 1980
LER 80-021/01T-0 for Dresden Unit 3 Regarding During Startup Following Refueling Outage, Combinations of 3A Target Rock Valve and 3B, 3C and 3E Electromatic Relief Valves Failed to Open at Rated Reactor Pressure While Performing Operability
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LER 80-017/03L-0 for Dresden Unit 3 Regarding During Refueling Outage, While Conducting Operability Surveillance Test, U-3 Diesel Generator Failed to Start
2020-05-14
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- LICENSE NUMBER 25 26 LICENSE TYPE ;JO 57 CAT 58 . CON'T .,.,. . I . . JiliJ. 7 8 L.::J© I o I s Io I o I o 12_1-3_ 17 JGI i 1 o 1 o I i 1 71 9 101 i 1 o I i 1 s 1 1 I 9 I G) 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE BO EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@
IDIJ !While performing a modification on the fire system, firewater accumulated on .I the mezzanine floor which then ran down into the U2 D/G control cabinet via the D/G I room vent **-ductwork, causing the diesel auto start block alarm. The operating engr. , .. IT]]] I declared the D/G inoperable and electrical maintenance was called upon to determine
- [QJI] ithe cause. The health and safety of the public was not affected because redundant
- rr:m I systems were verified operable by required testing. This event is the first. of its I* "[]]]] kind. 7 8 9 £2:ill 7 8 SYSTEM *CODE LE IE I@ 9 10 CAUSE *CAUSE COMP. CODE SUBCODE COMPONENT CODE SU8CODE I.LI w @ i R* 1 E 1 L 1 A 1 x 1 x , e LxJ 11 12 13. 18 19 SEQUENTIAL OCCURRENCE REPORT VALVE SUBCODE LzJ@ 20 I:":;\ LEA/RO. LVENT YEAR REPORT NO. CODE TYPE REPORT I 7 I 9 I I I I o I SI 2 I lrl Io I 3 I L£J I I NUMBER 21 22 23 24 26, 27 28 29 JO 31 ACTION FUTURE EFFECT SHUTDOWN . (:;:;\ ATTACHMENT NPRD-4 PRIME COMP. REVISION NO. l.QJ 32 COMPONENT MANUFACTURER 80 TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM :;us. ' SUPPLIER L!J@ L2J Io I 01 01 o I Ll!J@ *
- W@ JJ . . 34 35 36 " J 7 . 40 . 41 . 42 4J I GI 0 I 8 I 0 ' CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 44 . 47 o::I£J I Water in controi cabinet shorted the auto start relay contact causing auto start o:IIJ block alarm. The water was removed and the cabinet dried. Required surveillance was completed satisfactorily and the D/G demonstrated operable.
The seams between
- o:::DJ I ceiling and U2 & U3 DG room vent. ductwork which penetrates the ceiling,*
have been I . o::::r:rJ f sealed with RTV to-prevent recurrence.
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