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Category:REPORTABLE OCCURRENCE REPORT (SEE ALSO AO
MONTHYEARML19338C4441980-08-11011 August 1980 Ro:On 800804,radioactivity Released in Reactor Bldg.Caused by Helium Circulator Sys Malfunction.Employee Safety Not Jeopardized,Atmospheric Release Negligible & Public Not in Danger ML19318A8991980-06-18018 June 1980 Ro:On 800501 & 0617,minute Releases of Radioactivity Occurred in Reactor Bldg.Caused by Malfunction in Helium Circulator Sys.No Radiation Was Released Into Atmosphere. Public & Personnel Health & Safety Were Not Jeopardized ML19225A2211979-07-12012 July 1979 RO 50-267/77-17(14)1,final on 770506:during Plant Startup at 15% Power,Incorrect Feedwater Flow Trip Existed in 1 of 2 Plant Protective Sys Logics.Caused by Logic Chip Failure in Circular Trip Module CT-2B2 ML19225A1181979-07-12012 July 1979 RO 50-267/76-19A on 760617:while Reactor Was in Shutdown Condition,One Steam Water Dump Valve in Each Loop Opened. Caused by Design Problem.Failure Modes & Effects Analyzed & Steam Water Dump Circuits Revised ML19224D5841979-07-0303 July 1979 RO 50-26/79-13/03-L-0 on 790412:365 Hydraulic Snubbers Found to Be Inoperable During First Functional Test,Causing Both Unacceptable Lockup & Bleed Characteristics.Caused by Setpoint Drift,Dirty Oil & Clogged Valves.All Repaired ML20052F1261976-06-14014 June 1976 Ro:On 760521,discrepancies Found in Seismic Certifications for Equipment,Instruments & Components & in Application of Certain Components Required to Meet Seismic Conditions. Caused by Misinterpretation of FSAR Requirements 1980-08-11
[Table view] Category:LER)
MONTHYEARML19338C4441980-08-11011 August 1980 Ro:On 800804,radioactivity Released in Reactor Bldg.Caused by Helium Circulator Sys Malfunction.Employee Safety Not Jeopardized,Atmospheric Release Negligible & Public Not in Danger ML19318A8991980-06-18018 June 1980 Ro:On 800501 & 0617,minute Releases of Radioactivity Occurred in Reactor Bldg.Caused by Malfunction in Helium Circulator Sys.No Radiation Was Released Into Atmosphere. Public & Personnel Health & Safety Were Not Jeopardized ML19225A2211979-07-12012 July 1979 RO 50-267/77-17(14)1,final on 770506:during Plant Startup at 15% Power,Incorrect Feedwater Flow Trip Existed in 1 of 2 Plant Protective Sys Logics.Caused by Logic Chip Failure in Circular Trip Module CT-2B2 ML19225A1181979-07-12012 July 1979 RO 50-267/76-19A on 760617:while Reactor Was in Shutdown Condition,One Steam Water Dump Valve in Each Loop Opened. Caused by Design Problem.Failure Modes & Effects Analyzed & Steam Water Dump Circuits Revised ML19224D5841979-07-0303 July 1979 RO 50-26/79-13/03-L-0 on 790412:365 Hydraulic Snubbers Found to Be Inoperable During First Functional Test,Causing Both Unacceptable Lockup & Bleed Characteristics.Caused by Setpoint Drift,Dirty Oil & Clogged Valves.All Repaired ML20052F1261976-06-14014 June 1976 Ro:On 760521,discrepancies Found in Seismic Certifications for Equipment,Instruments & Components & in Application of Certain Components Required to Meet Seismic Conditions. Caused by Misinterpretation of FSAR Requirements 1980-08-11
[Table view] Category:TEXT-SAFETY REPORT
MONTHYEARML20196G6731997-07-0101 July 1997 Informs Commission That Decommissioning Process Has Been Completed at PSC of Colorado Fsvngs,Unit 1 Located in Town of Platteville in Weld County,Co ML20141K9961997-05-0505 May 1997 Safety Evaluation Supporting Amend 89 to License DPR-34 ML20140E1121997-04-10010 April 1997 Confirmatory Survey of Group Effluent Discharge Pathway Areas for Fsv Nuclear Station,Platteville,Co ML20134D1661997-01-30030 January 1997 Rev 1,Vol 6 to Final Survey Rept,Final Survey of Group E (Book 2A of 2) ML20137S6111996-12-31031 December 1996 Annual Rept Pursuant to Section 13 or 15(d) of Securities Exchange Act 1934, for Fy Ended Dec 1996 ML20134G6401996-10-29029 October 1996 Rev 0,Volume 6,Books 1 & 2 of 2 to Final Survey of Group E ML20134G6171996-10-29029 October 1996 Rev 2,Volume 1,Books 1 & 2 of 2 to Final Survey Description & Results ML20134G7271996-10-29029 October 1996 Rev 0,Volume 11,Book 1 of 1 to Final Survey of Group J ML20134G6861996-10-29029 October 1996 Rev 0,Volume 8,Books 1 & 2 of 2 to, Final Survey of Group G ML20134G6321996-10-26026 October 1996 Rev 1,Volume 5,Books 2 & 3 of 3 to Final Survey of Group D ML20133D7831996-10-22022 October 1996 Preliminary Rept - Orise Support of NRC License Insp at Fsv on 960930-1003 ML20116A4661996-07-19019 July 1996 Fsv Final Survey Exposure Rate Measurements ML20112J6861996-05-31031 May 1996 June 1996 Quarterly 10CFR50.59 Rept of Changes,Tests & Experiments for Fsv Decommissioning.Rept Covers Period of 960216-0531 ML20112C1531996-05-17017 May 1996 Fsv Final Survey Exposure Rate Measurements ML20101G5521996-03-21021 March 1996 Confirmatory Survey Activities for Fsv Nuclear Station PSC Platteville,Co, Final Rept ML20097E3201996-01-31031 January 1996 Nonproprietary Fort St Vrain Technical Basis Documents for Piping Survey Instrumentation ML20095K4131995-12-26026 December 1995 Rev 3 to Decommissioning Plan ML20095H7211995-12-20020 December 1995 Revs to Fort St Vrain Decommissioning Fire Protection Plan Update ML20095K9751995-12-15015 December 1995 Fort St Vrain Project Update Presentation to NRC, on 951207 & 15 ML20096C1671995-12-13013 December 1995 Rev 4 to Decommissioning Fire Protection Plan ML20094M1651995-11-30030 November 1995 Nonproprietary Fsv Technical Basis Documents for Piping Survey Implementation ML20092F3461995-09-14014 September 1995 Quarterly 10CFR50.59 Rept of Changes,Tests & Experiments for Fsv Decommissioning, Covering Period of 950516-0815.W/ ML20137H3531994-12-31031 December 1994 Partially Withheld, Rept of Independent Counsel Investigation Concerning Issues at Fort St Vrain Nuclear Generating Station Decommissioning Project, App D,Comments by Mkf & Westinghouse Team & Responses ML20137S2331994-12-31031 December 1994 Rept of Independent Counsel Investigation Concerning Issues at Fort St Vrain Nuclear Generating Station Decommissioning Project, Dec 1994 ML20029C6031993-12-31031 December 1993 1993 Annual Rept Public Svc Co of Colorado. W/940405 Ltr ML20058Q3791993-12-21021 December 1993 Rev 1 to Decommissioning Plan for Fort St Vrain Nuclear Generating Station ML20045B3641993-06-30030 June 1993 June 1993 Quarterly 10CFR50.59 Rept of Changes,Tests & Experiments for Fsv Decommissioning. ML20045A4291993-06-0303 June 1993 LER 93-003-00:on 930505,new Source of Natural Gas Introduced within 0.5 Miles of ISFSI & Reactor Bldg W/O Prior NRC Approval.Caused by Field Routing of Natural Gas Pipe.Well Isolated by Well operator.W/930603 Ltr ML20077D1631993-05-10010 May 1993 Enforcement Conference, in Arlington,Tx ML20125C7161992-12-0707 December 1992 Part 21 Rept Re Possibility for Malfunction of Declutching Mechanisms in SMB/SB-000 & SMB/SB/SBD-00 Actuators. Malfunction Only Occurs During Seismic Event.Balanced Levers May Be Purchased from Vendor.List of Affected Utils Encl ML20128D7191992-12-0101 December 1992 Safety Evaluation Approving Exemption from Requirement of 10CFR50.54(q) to Change to Biennial Emergency Plan Exercise Rather than Annual Following Completion of Next Scheduled Exercise at Plant ML20127P5861992-11-23023 November 1992 Followup to 921005 Part 21 Rept Re Potential Defect in SB/SBD-1 Housing Cover Screws.Procedure Re Replacement of SBD-1 Spring Cover Bolts Encl.All Fasteners Should Be Loosened & Removed.List of Affected Utils Encl ML20127F5691992-11-0303 November 1992 Informs Commission of Intent to Issue Order Approving Plant Decommissioning Plan & Corresponding Amend to License DPR-34 ML20101E5761992-05-31031 May 1992 Monthly Defueling Operations Rept for May 1992 for Fort St Vrain ML20096E8221992-04-30030 April 1992 Monthly Operating Rept for Apr 1992 for Fort St Vrain.W/ ML20095E9601992-04-17017 April 1992 Rev to Fort St Vrain Proposed Decommissioning Plan ML20100R7431992-03-31031 March 1992 Monthly Operating Rept for Mar 1992 for Fort St Vrain.W/ ML20090L0621992-02-29029 February 1992 Monthly Operating Rept for Feb 1992 for Fort St Vrain Unit 1 ML20092D0081992-01-31031 January 1992 Monthly Operating Rept for Jan 1992 for Fort St Vrain Nuclear Generating Station ML20102B2241992-01-22022 January 1992 Fort St Vrain Station Annual Rept of Changes,Tests & Experiments Not Requiring Prior Commission Approval Per 10CFR50.59, for Period 910123-920122 ML20094N6701991-12-31031 December 1991 Public Svc Co Annual Financial Rept for 1991 ML20091J6251991-12-31031 December 1991 Monthly Operating Rept for Dec 1991 for Fort St Vrain.W/ ML20094D6711991-11-30030 November 1991 Monthly Operating Rept for Nov 1991 for Fort St Vrain Unit 1 ML20090M1871991-11-20020 November 1991 FOSAVEX-91 Scenario for 1991 Plant Exercise of Defueling Emergency Response Plan ML20086D6891991-11-15015 November 1991 Proposed Decommissioning Plan for Fort St Vrain Nuclear Generating Station ML20085N1451991-11-0505 November 1991 Revised Ro:Operability Date of 910830 for Electric Motor Driven Fire Water Pump P-4501 Not Met.Pump Not Actually Declared Operable Until 911025.Caused by Unforseen Matl & Testing Problems.Equivalent Pump Available ML20086C5451991-10-31031 October 1991 Monthly Operating Rept for Oct 1991 for Fort St Vrain.W/ ML20085H6611991-10-10010 October 1991 Assessment of Mgt Modes for Graphite from Reactor Decommissioning ML20091D7671991-10-0101 October 1991 Rev B to Engineering Evaluation of Prestressed Concrete Reactor Vessel & Core Support Floor Structures for Proposed Sys 46 Temp Change ML20085D9861991-09-30030 September 1991 Monthly Operating Rept for Sept 1991 for Fort St Vrain.W/ 1997-07-01
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),id , d 16805 Weld County Road 191/2, Platteville, Colorado 80651-9298 wraa a June 9,1982 Fort St. Vrain Unit No. 1 PPC-82-1175 fir. George Kuzmycz Nuclear Regulatory Conmission 7920 Norfolk Avenue Bethesda, Maryland 20034
Dear Mr. Kuzmycz:
As per your request, attached is information concerning the manual t, cram taken June 5,1982, due to an undervoltage relay trip in the plant elec-trical system.
If you have any further questions, please contact Ed Hill.
Very truly yours ,
~ WkM Y /%
Don Warembourg Manager, Nuclear Production DW/cls Attachment l
~
i 01 5 n
8206100002 820609 PDR ADOCK 05000267 S PDR
P
- On June 5, at 1550 hours0.0179 days <br />0.431 hours <br />0.00256 weeks <br />5.89775e-4 months <br />, with the reactor at approximately 13% power, one of two undervoltage relays, which monitor two phases of the 4KV side of
- the reserve auxiliary transformer, tripped, causing load shedding of the 480V essential busses 1, 2, and 3. Both undervoltage relays have to trip to cause the 4KV feed breaker to trip, thus, it remained closed and 4KV power equipment ("B" boiler feedpump, A and B condensate pumps, A and B circulator pumps), except the 480V busses, remained operating / operable.
The purpose of the relays is to detect low voltage from the 4KV (i.e. ,
4 loss of electrical power or phase loss) coincidental with a turbine trip
- and shed the load from the 480V busses in order to ensure the diesel generators close in on a dead bus.
The reactor operator manually scrammed the reactor, and the diesel gener-ator units A and B automatically started and closed in to the dead 480V busses. l A diesel generator set picked un 480V bus 1 and 2 as it was
- the first up-to-speed and IB diesel generator set picked up bus 3. The programmed automatic sequencer for the diesel generators started un es-sential equipment as designed, and no problems were encountered. The buffer / bearing water upset tripped three of four helium circulators and 1
resulted in a small amount of activity being released to the Reactor a Building; however, MPC limits were not exceeded. Activity levels had
- decayed to background levels by 2240 hours0.0259 days <br />0.622 hours <br />0.0037 weeks <br />8.5232e-4 months <br />.
1 Recovery actions were started immediately, and the 480V busses and diesel generator units were paralleled to the 4KV at 1810 hours0.0209 days <br />0.503 hours <br />0.00299 weeks <br />6.88705e-4 months <br />. The elec-trical system was restored to normal at 2030 hours0.0235 days <br />0.564 hours <br />0.00336 weeks <br />7.72415e-4 months <br /> and plant recovery operations continued as expected. Subsequent investigation revealed a PFC relay department procedural inadequacy in calibrating the relay in q ues tion. A followup report will be submitted per the reoorting re-quirements of Fort St. Vrain Technical Specification AC 7.5.2(b)3.
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