ML19254E194
| ML19254E194 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 10/22/1979 |
| From: | Stout J BALTIMORE GAS & ELECTRIC CO. |
| To: | |
| References | |
| NUDOCS 7910310303 | |
| Download: ML19254E194 (1) | |
Similar Documents at Calvert Cliffs | |
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Category:REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER)
MONTHYEARML20205N2951999-04-13013 April 1999
[Table view]Special Rept:On 990314,fire Detection Sys Was Removed from Svc to Support Mod to Replace SRW Heat Exchangers in Unit 2 SRW Room During Unit 2 Refueling Outage.Contingency Measure 15.3.5.A.1 Will Continue Until Fire Detection Sys Restored ML20206Q3221999-01-11011 January 1999 Special Rept:On 981226,wide Range Noble Gas Effluent RM Was Removed from Operable Status.Caused by Failure of mid-range Checksource to Properly Reseat.Completed Maint & post-maint Testing & RM Was Returned to Operable Status on 990104 ML20154Q7191998-10-21021 October 1998 Special Rept:On 980923,unit 1 Wrngm Was Removed from Operable Status.Caused by Failure of Process Flow Transducer.Completed Maint to Remove Process Flow Transducer Input to Wrngm Microprocessor & Completed Formal Evaluation ML20153C2571998-09-18018 September 1998 Special Rept:On 980830,wide Range Noble Gas Monitor (Wrngm) Channel Was Removed from Operable Status.Caused by Need to Support Performance of Required 18-month Channel Calibr.Will Return Wrngm to Operable Status by 980925 ML20151T5281998-09-0101 September 1998 Special Rept:On 980819,declared Rv Water Level Monitor Channel a Inoperable.Caused by Failure of Three Heated Junction Thermocouples (Sensors) in Lower Five Sensors. Channel a & B Rv Water Level Probes Will Be Replaced ML20249A9571998-06-15015 June 1998 Special Rept:On 980430,fire Detection Sys Was Removed from Svc to Support Mod to Purge Air Sys 27-foot Elevation & 5-foot Elevation East Piping Penetration Rooms.Installed Temporary Alteration & Returned Fire Detection Sys to Svc ML20247K2641998-05-15015 May 1998 Special Rept:On 980405,Unit 1 Svc Water Room Fire Detection Instrumentation Was Inoperable for Greater than 14 Days. Caused by Support of Mod Sys.Will Restore Instrumentation to Operable Status After Mod Welding Work Is Completed ML20247K2461998-05-15015 May 1998 Special Rept:On 980409,Unit 1 TB SW Room,Fire Barrier Penetrations (Doors 213 & 214) Had Been Inoperable for More than 7 Days.Doors Were Opened to Permit Movement of Matl in & Out of Room.Doors Will Be Open Until Mods Are Completed ML20247K3281998-05-15015 May 1998 Special Rept:On 980405,fire Detection Instrumentation in Unit 1 East & West RCPs Motor Bays Were Inoperable for More than 14 Days.Bays Were Removed to Support Overhaul of RCP Motors.Will Restore Implementation Upon Repair Completion ML20216G3951998-04-15015 April 1998 Special Rept:On 980320,declared Unit 2 Reactor Vessel Water Level Monitor Channel Inoperable.Caused by Failure of Three Heated Junction Thermocouples in Lower Five Sensors.Will Replace Channel B Reactor Vessel Water Level Probe ML20216D2641998-04-0202 April 1998 Ro:On 980226,discovered Potential Condition That May Render NUHOMS-24P Dry Shielded Canister/Fuel Package Defective. Caused Misapplication of Llnl Rept UCID-21246, Dynamic Impact Effects of Sfas. Performed Operability Evaluation ML20202C1761998-02-0505 February 1998 Special Rept:On 980101,CR Vestibule to Turbine Bldg Door 401 Failed to Automatically Close as Designed.Caused by Increased Vestibule Pressure.Util Made Adjustments to Doors Automatic Closure Mechanism ML20212F4911997-10-30030 October 1997 Ro:On 970930,fire Detection Instrumentation Declared Inoperable Greater than 14 Days to Support Mod to Svc Water Hxs.Fire Detection Will Be Restored to Operable Status When Mod Completed ML20217R3401997-08-28028 August 1997 Ro:On 970729,abnormal Degradation of Surveillance Was Detected.Scope of lift-off Testing & Visual Insps to 100% of Tendons to Determine Extent & Cause of Corrosion Has Been Expanded ML20151J8951997-07-24024 July 1997 Special Rept:On 970628,Unit 2 WR Noble Gas Monitor Was Inoperable for Period in Excess of Seven Days.Caused by Failure of Low Range Channel High Voltage Power Supply. Replacement Power Supply Was Installed ML20141H3341997-07-0101 July 1997 Special Rept:On 970606,Main Steam Header Radiation Monitors Were Declared Inoperable.Caused by Failure of Detectors to Respond to Checksource.Will Continue Addl Vendor Testing of Proposed Mod & Will Perform Testing of Modified Detectors ML20141H5331997-05-15015 May 1997 Special Rept:On 970415,Unit 1 Wide Range Noble Gas Monitor Was Removed from Operable Status.Caused by Removal of Monitor from Svc to Complete Approved Mod ML20141H0171997-05-15015 May 1997 Special Rept:On 970425,Unit 1 Containment High Range Radiation Monitors Removed from Operable Status.Caused by Removal of Monitors from Svc to Complete Approved Mod ML20141D3731997-05-0808 May 1997 Special Rept:On 970331,fire Detection Instruments Main Exhaust Equipment Room Were Disabled Due to Welding Activities.Established Hourly Fire Watch Patrols in Affected Areas,Completed Welding & Returned Instruments to Service ML20141D4051997-05-0808 May 1997 Special Rept:On 970327,fire Detection Sys Removed from Svc to Support Mod to Purge Air Sys in Unit 2 27-foot Elevation & 5-foot Elevation East Piping Penetration Rooms During Refueling Outage.Temporary Alteration Installed ML20148A8091997-05-0101 May 1997 Special Rept:On 970421,portion of Fire Suppression Water Sys Was Isolated.Caused by Repairs Being Made to Section of Fire Main Piping.Fire Main Restored to Normal line-up ML20141G1851997-04-28028 April 1997 Special Rept:On 970317,fire Detection Instruments in Unit 2 Containment 22A RCP Motor Bay Disabled Via Temporary Alteration.Heat Detection Circuits Were Not Restored within 14 Days Required by Ts.Fire Detection Will Be Tested ML20141D3821997-04-28028 April 1997 Special Rept:On 970319,Fire Detection Sys for Units 1 & 2 Rendered Inoperable.Caused by Unit Shutdown for Refueling Outage.Restored Fire Detection Sys to Operable Status at Conclusion of Unit 2 Refueling Outage ML20138E8211997-04-23023 April 1997 Special Rept:On 970316,fire Barrier Penetrations Were Inoperable for More than 7 Days Due to Placement of Pal in Open Position.Pal Will Be Closed & Interlocks re-enabled Prior to Unit 2 Startup ML20135F3381997-03-0505 March 1997 Special Rept:On 970208,removed Main Steam Header Radiation Monitors from Operable Status to Allow Installation of New Main Steam Header Radiation Monitors Per Approved Mod.Will Return Monitors to Operable Status 970307 ML20135F3441997-03-0505 March 1997 Special Rept:On 970122,declared Halon Fire Suppression Sys Inoperable.Caused by Failure of Damper to Stroke Fully Closed.Removed,Overhauled & Reinstalled Damper 0-DAMP-5443 W/Replacement Bushings ML20134F8411997-02-0303 February 1997 Special Rept:On 970110,declared Main Steam Header Radiation Monitor Inoperable.Caused by Intermittent Electrical Contact in Cable & Degrade Performance of Ratemeter.Installed Ratemeter During Week of 970210 ML20133M2221997-01-17017 January 1997 Special Rept:On 961220,declared Main Steam Header Radiation Monitor Inoperable.Caused by Intermittent Electrical Contact of Ratemeter Connector for Signal Cable from Detector. Replaced Cable Connector ML20117J9901996-09-0404 September 1996 Special Rept:On 960807,Diesel Fire Pump Disabled.Caused by Routine Maint on Pump.Completed Work on Pump,Tested & Restored Pump to Operable Status ML20117F6391996-05-14014 May 1996 Special Rept:On 960404,fire Hose Stations Inside Unit 1 Containment Disabled to Permit Work Activities.Temporary Fire Hose in Place Until Fire Main Restored to Operable Status on 960507 ML20108D7941996-05-0303 May 1996 Special Rept:On 960326,fire Detection Instrumentation in Unit 1 SW Water Pump Room Was Disabled Via Temporary Alteration to Permit Work Activities.Hourly Fire Watch Patrol Was Initiated to Inspect Affected Fire Zone ML20108D7861996-05-0303 May 1996 Special Rept:On 960330,RCP Motor Bay Was Disabled Due to Temporary Alteration to Support Removal of 12B RCP Motor During Unit 1 Refueling Outage.Containment Air Being Monitored Once Per H at Location Listed in SR 4.6.1.5 ML20095A3741995-12-0101 December 1995 Special Rept:On 951104,Unit 2 Main Steam Header Radiation Monitor Removed from Svc.Caused by Degraded Performance of Circuit Cards in Control Room Ratemeter.Main Steam Header Radiation Monitor Returned to Operable Status ML20092B7211995-09-0707 September 1995 Special Rept:On 950801,diesel Fire Pump (DFP) 12 for Fire Suppression Water Sys Disabled & on 950808,exceeded Seven Day Requirement to Restore Inoperable Equipment to Operable Status.Dfp Engine Rebuilt & DFP Declared Operable on 950901 ML20084R4441995-06-0202 June 1995 Special Rept:On 950403,hydrogen Analyzer Inoperable Due to Maint on EDG 21.Following Maint Hydrogen Analyzer Returned to Svc ML20082G6891995-04-11011 April 1995 Special Rept:On 950320,fire Detection Instruments in Containment 21B RCP Motor Bay Inoperable for Greater than 14 Days to Support Unit 2 Refueling outage-related Work. Appropriate Compensatory Actions Taken ML20082F4301995-04-0707 April 1995 Special Rept:On 950310,WR Noble Gas Effluent RM Failed Automatic Check Source.Monitor Has Repeatedly Failed mid- Range Check Sources,Causing Failed Automatic Check Source. Temporary Alteration Made to mid-range Channel ML20064N9891994-03-25025 March 1994 Special Rept:On 940224,fire Detection Instrumentation Was Inoperable for More than 14 Days.Established Hourly Fire Watch to Inspect Fire Zone ML20063K4591994-02-11011 February 1994 Special Rept:On 940110,fire Suppression Halon Sys Disabled Due to Work Activity in Area Involving Removal of Marinite Cable Tray Covers.Halon Sys Inoperable for More than 14 Days.Subj Sys Scheduled to Be Inoperable Until 940412 ML20063K4571994-02-11011 February 1994 Ro:On 940131,plant Intake Embayment Instrumentation Sample Pump Found to Be Not Working.Pump Out of Svc for Unknown Amount of Time But Less than 72 H.Sample Pump Immediately Replaced & Sample Flow Restored ML20059D6341993-12-15015 December 1993 Special Rept:On 931215,discovered Wide Range Noble Gas Monitor Out of Svc for More than 7 Days.Caused by Malfunctioning mid-range Check Source Assembly.Monitor Returned to Svc on 931214 ML20035A9131993-03-25025 March 1993 Special Rept:On 930216,fire Detection Instrumentation for Intake Structure Disabled for More than 14 Days Via Temporary Alteration.Hourly & Continuous Fire Watch Established During Welding/Grinding & Cutting Operations ML20044C1671993-03-11011 March 1993 Special Rept:On 930211,wide Range Noble Gas Monitor (Wrngm) Removed from Svc When Automatic 8-h Check Source Failed Due to Failure of Preamplified Board.Board Replaced on 930217 & Wrngm Restored to Operable Status on 930222 ML20116N4171992-11-13013 November 1992 Special Rept:On 921005,fire & Smoke & Flame Detection for Spent Fuel Area Disabled to Permit Welding,Cutting & Grinding Operations to Install New Spent Fuel Crane.Hourly & Continuous Fire Watch Established Until Equipment Restored ML20115J0051992-10-22022 October 1992 Special Rept:On 920921,Channel a Rvlms Removed from Svc & Channel a Failed Open Thermocouple Test.On 921001,improper Ground Isolation Discovered,Resulting in Incorrect Voltages to Circuit Board.Channel a Returned to Svc on 921002 ML20115C5841992-10-0909 October 1992 Special Rept:On 920829,Tech Spec App B Re Fish Killed.Caused by Low Dissolved Oxygen Levels in Embayment Area.Licensees Anticipate That Mod Will Reduce Mortality Rates of Fish, Especially Large Ones ML20099K2841992-08-21021 August 1992 Special Rept:On 920720,fire Dampers for Unit 1 Auxiliary Bldg Exhaust,Unit 1 Containment Purge Exhaust,Unit 2 Auxiliary Bldg Exhaust & Unit 2 Containment Purge Exhaust Found Inoperable.Hourly Fire Watch Established ML20101U4631992-07-20020 July 1992 Special Rept:On 920624,fire Dampers for Switchgear Room HVAC Found Inoperable.Hourly Fire Watch Established.Root Cause & Corrective Actions for Event Will Be Discussed in Upcoming LER ML20101F4211992-06-22022 June 1992 Special Rept:On 920518,fire Dampers for Switchgear Room HVAC Sys Found Inoperable During Engineering Test Procedure 91-77 Re Fire Damper Testing.Cause Unknown.Maint Work in Progress to Correct Fire Dampers ML20101F5181992-06-22022 June 1992 Special Rept:On 920609,detectors Were Declared Inoperable for More than 14 Days.Hourly Fire Watch Patrol Was Established & Detection Sys Was Restored to Operable Status 1999-04-13 Category:TEXT-SAFETY REPORT MONTHYEAR05000317/LER-1999-006, :on 990922,manual Reactor Trip Was Noted.Caused by Inadequate Electrical Current Determination.Evaluated Trip Risk Assessment Process for Enhancements.With1999-10-22022 October 1999
[Table view]
ML20195D4271998-11-0505 November 1998 Safety Evaluation Supporting Amend 203 to License DPR-69 ML20196E2211998-10-31031 October 1998 Non-proprietary Rev 03-NP to CEN-633-NP, SG Tube Repair for Combustion Engineering Designed Plant with 3/4 - .048 Wall Inconel 600 Tubes Using Leak Limiting Alloy 800 Sleeves ML20195E5281998-10-31031 October 1998 Monthly Operating Repts for Oct 1998 for Calvert Cliffs Nuclear Power Station,Units 1 & 2.With ML20154Q7191998-10-21021 October 1998 Special Rept:On 980923,unit 1 Wrngm Was Removed from Operable Status.Caused by Failure of Process Flow Transducer.Completed Maint to Remove Process Flow Transducer Input to Wrngm Microprocessor & Completed Formal Evaluation ML20154G3931998-10-0505 October 1998 Safety Evaluation Concluding That Flaw Tolerance Evaluation for Assumed Flaw in Inboard Instrument Weld of Pressurizer Meets Rules of ASME Code ML20154M5841998-09-30030 September 1998 Monthly Operating Repts for Sept 1998 for Calvert Cliffs Nuclear Plant,Units 1 & 2.With 1999-09-30 |
Text
- %s g BALTIMORE
[ GAS AND s ELECTRIC CHARLES CENTER. P.O. BOX 1475 BALTIMORE, MARYLAND 21203 ELtcraic ENGINEERING our4=ru Nr October 22, 1979 M. Boyce H. Grier, Director r
Office of Inspecticn and Enforcement Region 1, USNRC 631 Park Avenue King of Prussia, PA.
19h06
Dear Mr. Grier:
Eubject: Calvert Cliffs Nuclear Power Plant Units No. 1 and 2.
License Nos. DPR-53 and 69 Nonroutine Radiological Enviren= ental Operating Report.
This report is sub=itted, in duplicate, to ec= ply with the require-ments of Appendix B Environ = ental Technical Specifications Section 5.6.2.b.
The Oyster sa=ples were collected en August 27, 1979 frc= the C;=p-Coney sa pling locatien and analyzed for ga--a-emitting radionuclides as required.
The results of the analyses showed the presence of Ag-110 at 266* h% pCi/Kg(vet).
The cyster sa=ples collected en the same date frc= the K nwood Beach sa=pling location (the background locatien) sheved Ag-llc = at e
$ hpCi/Kg(vet).
A review of the available effluent release data indicates that Ag-100 = in oysters is plant related.
Based on the observed levels of Ag-10C= during August 1979, for an average adult consu=ing ene kilogra of oysters per year the doses to the GI Tract and Whcle Ecdy are estimated at v 1.6x10-2 =re=/ year and.v 2.3x10 -5
=re / year, respectively.
These are very s-n'l fractions of the allevable 25 =re=/ year (GI Tract) and 25 =re=/ year (Whole 3cdy) deses to =e=bers of the general public, (L0 CFR Part 190 Environ = ental Radiation Protection Standards for Nuclear Power Operations) and are considered to be of no consequence to the health and safety of the public.
Very truly yours, L _ '.t J. W. Stout, Jr.
Chief Environ = ental Engineer ec: Director, Office of Nuclear Reactor Regulation Washington, DC 20555 (17 copies) 4
- 7rb r,
D i
7910310 250 3
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