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Category:INTERNAL OR EXTERNAL MEMORANDUM
MONTHYEARML20205B6111999-03-26026 March 1999 Notification of 990419 Meeting with Util in Rockville,Md to Discuss Licensing Issues at Plant,Including Racking of Cask Pit for Storage of Spent Fuel ML20153F7981998-09-23023 September 1998 Forwards NRC Operator Licensing Exam Rept 50-346/98-301OL, (Including Completed & Graded Tests) for Tests Administered on 980803-07 ML20153F8291998-09-23023 September 1998 Forwards NRC Approved Operator Licensing Exam Facility Outline & Initial Exam Submittal & as-given Operating Exam for Tests Administered During Wk of 980803 ML20236F3581998-06-26026 June 1998 Forwards NRC Insp Mc 0350, Staff Guidelines for Restart Approval, for Oversight Activities for Davis Besse Station ML20236N8641998-06-11011 June 1998 Discusses TS Interpretation on Application of Davis Besse TS 3.6.5.1 & 3.6.5.2.TB Branch Recommends That Davis Besse Consider Converting TS to Improved Standard TS ML20216F3291998-04-13013 April 1998 Accepts 980406 Licensee Request for Approval to Install machine-welded SG Tube Plugs in Accordance W/Provisions of Paragraph IWB-4230, Tube or Tubesheet Hole Plugging by Fusion Welding, of Section XI ML20202E6241997-11-26026 November 1997 Notification of 971215 Meeting W/Util in Rockville,Md to Discuss Quality Assurance Program at Davis-Besse ML20211Q4711997-10-16016 October 1997 Notification of 971113 Meeting W/Toledo Edison Co in Rockville,Md to Discuss Ultimate Heat Sink at Davis-Besse ML20211B5561997-09-23023 September 1997 Forwards NRC Approved Operator Licensing Exam (Facility Outline & Initial Exam Submittal & as-given Operating Exam) for Tests Administered on 970707-11 ML20211C5091997-09-23023 September 1997 Forwards NRC Operator Licensing Exam Rept 50-346/97-308OL (Including as-given Writtem Exam) for Tests Administered on 970707-10 ML20149E7411997-07-16016 July 1997 Notification of 970821 Meeting W/Util in Rockville,Md to Discuss Instrument Drift Study ML20137U2051997-04-14014 April 1997 Informs That Davis-Besse Nuclear Power Station Nuclear Assurance Dept Will Be Reorganized Into Two Separate Dept; DB Nuclear Assurance & DB Nuclear Support Svc,Effective, 970414 ML20136F9491997-03-13013 March 1997 Notification of 970403 Meeting W/Util in Rockville,Md to Discuss Progress on Thermo-Lag Issue Resolution ML20138J7671997-02-0505 February 1997 Informs That NRC Plans to Administer Generic Fundamentals Exam Section of Written Operator Licenseing Exam on 970409. Ltr W/Copy to Chief,Operator Licensing Branch Must Be Submitted to Listed Address in Order to Register Personnel ML20134P9011996-11-26026 November 1996 Notification of 961204 Meeting W/Clei & Teco in Rockville,Md to Discuss Potential Submittals Concerning Proposed Merger of Centerior Energy Co & Oec ML20149E8161994-08-0202 August 1994 Forwards Fr Notice of License Amend Requests Proposed Merger of Toledo Edison Co & Cleveland Electric Illumianting Co Antitrust Determination ML20059H8361994-01-19019 January 1994 Notification of 940201 Meeting W/Util in Rockville,Md to Discuss Pending Davis-Besse Licensing Actions ML20057F1311993-10-0707 October 1993 Notification of 931020 Meeting W/Util in Rockville,Md to Discuss Davis-Besse Implementation of Reg Guide 1.97 for Steam Generator Pressure Instruments ML20127N6121993-01-25025 January 1993 Notification of 920205 Meeting W/Util in Rockville,Md to Discuss Emergency Action Levels Proposed Rev,Submitted 930112 ML20127C0411993-01-0808 January 1993 Notification of 930112 Meeting W/B&W Owners Group in Clearwater Beach,Fl to Discuss Generic Program Plan for License Renewal Initiative ML20127F5461993-01-0707 January 1993 Notification of 930115 Meeting W/Util in Rockville,Md to Discuss Plant Containment Penetration Bellows Tests.Draft Agenda Encl ML20126F5541992-12-0808 December 1992 Notification of 921215 Meeting W/Util in Rockville,Md to Discuss Proposed License Amend to Change from Automatic to Manual Closure of Containment Purge & Exhaust Valves in Mode 6 ML20128C2071992-11-0606 November 1992 Notification of 921202 Meeting W/Util in Rockville,Md to Discuss Upcoming Refueling Outage Plans & Recent Plant Performance ML20127C4131992-07-24024 July 1992 Responds to 910322 Memo Requesting Assistance on Whether 10CFR50.59 Review Should Have Been Performed for Broken Pipe in Station Drainage & Discharge Sys Releasing low-level Radioactivity Onsite ML20059D2711990-08-0606 August 1990 Discusses Review of State of Oh & Local Radiological Emergency Response Plans.Determined That No Issues Identified During 890809-09 Exercise to Prevent Finding of Reasonable Assurance for Site ML20148T1891990-04-10010 April 1990 Responds to Request for Info Re Congressional Inquiries on Tracking & Closeout of Issues Raised Re Incident Investigation Team (IIT) Investigations of Plants.Actions Assigned by EDO in Response to Plant IITs Addressed ML20246N8091989-08-30030 August 1989 Notification of 890907 Meeting W/Util in Rockville,Md to Discuss Exemption from App R to 10CFR50 for Specific Configuration of Pressurizer Instrumentation ML20244A4611989-06-0606 June 1989 Notification of 890615 Meeting W/Util & Westinghouse Owners Group in Rockville,Md to Discuss Reactor Vessel Support Embrittlement ML20247B9481989-03-23023 March 1989 Notification of 890404 Meeting W/Util in Rockville,Md to Discuss Applicability of Test of Bunker Ramo Penetrations for Meeting Environ Qualification Requirements at Facility ML20195G8751988-11-25025 November 1988 Forwards Signed,Original Order Modifying License Issued to Util on 881121 for Transmittal to Fr for Publication.W/O Encl ML20206A1171988-11-0808 November 1988 Notification of 881117 Meeting W/Util in Rockville,Md to Discuss Proposed Fuel Enrichment Change Application ML20151U1241988-08-11011 August 1988 Forwards Fr Notice Extending Time for Comments on Request of Cleveland Electric Illuminating Co & Toledo Edison Co to Suspend Plant Antitrust License Conditions ML20151T3371988-08-0909 August 1988 Notification of 880817 Meeting W/Util in Rockville,Md to Discuss SER on ATWS Issued by Staff to Utils ML20151E1981988-07-14014 July 1988 Notification of 880721 Meeting W/Util in Rockville,Md to Discuss Licensee Response to Questions on Fire Protection Program ML20150E8851988-07-0707 July 1988 Notification of 880725 Meeting W/Util in Rockville,Md to Discuss Status of Refuel Outage & Configuration of Mgt Sys ML20151L9961988-06-16016 June 1988 Discusses Engineering Insp DRP-07 Re Safety Sys Outage Mod Involving Auxiliary Feedwater Sys.Insp Identified Several Instances of Inadequate Engineering Review.Addl Insp of Engineering Design Review Requested in Jul-Aug ML20195E5431988-06-10010 June 1988 Submits Status Summary Rept on Multi-Plant Action B-66, Natural Circulation Cooldown. Near-term OLs Should Not Be Added to Safety Issues Mgt Sys Listing for Subj Action ML20154R8651988-06-0808 June 1988 Requests That Encl Slides from 860627 Presentation to ACRS Re Maint Review at Facility Be Placed in PDR ML20148T0851988-06-0303 June 1988 Discusses Multiplant Action F-58,Items II.K.3.30 & II.K.3.31 Compliance w/10CFR50.46 ML20151N8041988-04-18018 April 1988 Notification of 880428 Meeting W/Util in Oak Harbor,Oh Re Technical Discussions Concerning Plant Control Ctr ML20151B7141988-04-0606 April 1988 Comments on Cj Papariello 880323 Memo Re Insp of Allegations at Plants.Significance of Allegations Low & Do Not Warrant Immediate Review & Closure ML20148E3191988-03-18018 March 1988 Notification of 880330 Meeting W/Util in Oak Harbor,Oh to Discuss SALP 6 Rept ML20150B9671988-03-11011 March 1988 Requests That Encl 870911 Memo from J Scinto Be Included in Docket Files.Memo Relates to 870122 Application for Amend to License NPF-3 Re Organization Changes ML20155K2001988-03-0909 March 1988 Discusses Topics for Senior Mgt Meeting & Submits Partial Listing of Facilities Where Vendor Support Has Been Problem,Vendor Involved & Component/Issue of Interest. W/Copyrighted Matl IA-88-165, Discusses Topics for Senior Mgt Meeting & Submits Partial Listing of Facilities Where Vendor Support Has Been Problem,Vendor Involved & Component/Issue of Interest. W/Copyrighted Matl1988-03-0909 March 1988 Discusses Topics for Senior Mgt Meeting & Submits Partial Listing of Facilities Where Vendor Support Has Been Problem,Vendor Involved & Component/Issue of Interest. W/Copyrighted Matl ML20236U6471987-11-27027 November 1987 Forwards Safety Evaluation Re Assessment of Errors in Util Analysis for Small Break Loca,Per 860718 Request.Incorrect Values Used in Analysis Result in Incomplete Compliance W/ 10CFR50,App K.Performance Requirements of 10CFR50.46 Met ML20153E9181987-11-16016 November 1987 Forwards Oct 1987 Significant Intergovernmental Activities & Issues Rept.Rept Represents Combined Efforts of NRC Regional State Liaison Officers,State,Local & Indian Tribes Programs Staff & Regional State Agreement Representatives ML20236A6081987-10-20020 October 1987 Notification of 871113 Meeting W/Util in Bethesda,Md to Discuss Util Reassessment of Programs,Priorities & Planned Fifth Refueling Outage Work Items ML20236A6171987-10-20020 October 1987 Notification of 871029 & 30 Meetings W/Util in Bethesda,Md to Discuss Facility Fire Protection Program ML20236A9711987-10-19019 October 1987 Forwards Biweekly Status Rept for 870926-1009 1999-03-26
[Table view] Category:MEMORANDUMS-CORRESPONDENCE
MONTHYEARML20205B6111999-03-26026 March 1999 Notification of 990419 Meeting with Util in Rockville,Md to Discuss Licensing Issues at Plant,Including Racking of Cask Pit for Storage of Spent Fuel ML20153F7981998-09-23023 September 1998 Forwards NRC Operator Licensing Exam Rept 50-346/98-301OL, (Including Completed & Graded Tests) for Tests Administered on 980803-07 ML20153F8291998-09-23023 September 1998 Forwards NRC Approved Operator Licensing Exam Facility Outline & Initial Exam Submittal & as-given Operating Exam for Tests Administered During Wk of 980803 ML20236F3581998-06-26026 June 1998 Forwards NRC Insp Mc 0350, Staff Guidelines for Restart Approval, for Oversight Activities for Davis Besse Station ML20236N8641998-06-11011 June 1998 Discusses TS Interpretation on Application of Davis Besse TS 3.6.5.1 & 3.6.5.2.TB Branch Recommends That Davis Besse Consider Converting TS to Improved Standard TS ML20216F3291998-04-13013 April 1998 Accepts 980406 Licensee Request for Approval to Install machine-welded SG Tube Plugs in Accordance W/Provisions of Paragraph IWB-4230, Tube or Tubesheet Hole Plugging by Fusion Welding, of Section XI ML20202E6241997-11-26026 November 1997 Notification of 971215 Meeting W/Util in Rockville,Md to Discuss Quality Assurance Program at Davis-Besse ML20211Q4711997-10-16016 October 1997 Notification of 971113 Meeting W/Toledo Edison Co in Rockville,Md to Discuss Ultimate Heat Sink at Davis-Besse ML20211C5091997-09-23023 September 1997 Forwards NRC Operator Licensing Exam Rept 50-346/97-308OL (Including as-given Writtem Exam) for Tests Administered on 970707-10 ML20211B5561997-09-23023 September 1997 Forwards NRC Approved Operator Licensing Exam (Facility Outline & Initial Exam Submittal & as-given Operating Exam) for Tests Administered on 970707-11 ML20149E7411997-07-16016 July 1997 Notification of 970821 Meeting W/Util in Rockville,Md to Discuss Instrument Drift Study ML20137U2051997-04-14014 April 1997 Informs That Davis-Besse Nuclear Power Station Nuclear Assurance Dept Will Be Reorganized Into Two Separate Dept; DB Nuclear Assurance & DB Nuclear Support Svc,Effective, 970414 ML20136F9491997-03-13013 March 1997 Notification of 970403 Meeting W/Util in Rockville,Md to Discuss Progress on Thermo-Lag Issue Resolution ML20138J7671997-02-0505 February 1997 Informs That NRC Plans to Administer Generic Fundamentals Exam Section of Written Operator Licenseing Exam on 970409. Ltr W/Copy to Chief,Operator Licensing Branch Must Be Submitted to Listed Address in Order to Register Personnel ML20134P9011996-11-26026 November 1996 Notification of 961204 Meeting W/Clei & Teco in Rockville,Md to Discuss Potential Submittals Concerning Proposed Merger of Centerior Energy Co & Oec ML20149E8161994-08-0202 August 1994 Forwards Fr Notice of License Amend Requests Proposed Merger of Toledo Edison Co & Cleveland Electric Illumianting Co Antitrust Determination ML20059H8361994-01-19019 January 1994 Notification of 940201 Meeting W/Util in Rockville,Md to Discuss Pending Davis-Besse Licensing Actions ML20057F1311993-10-0707 October 1993 Notification of 931020 Meeting W/Util in Rockville,Md to Discuss Davis-Besse Implementation of Reg Guide 1.97 for Steam Generator Pressure Instruments ML20127N6121993-01-25025 January 1993 Notification of 920205 Meeting W/Util in Rockville,Md to Discuss Emergency Action Levels Proposed Rev,Submitted 930112 ML20127C0411993-01-0808 January 1993 Notification of 930112 Meeting W/B&W Owners Group in Clearwater Beach,Fl to Discuss Generic Program Plan for License Renewal Initiative ML20127F5461993-01-0707 January 1993 Notification of 930115 Meeting W/Util in Rockville,Md to Discuss Plant Containment Penetration Bellows Tests.Draft Agenda Encl ML20126F5541992-12-0808 December 1992 Notification of 921215 Meeting W/Util in Rockville,Md to Discuss Proposed License Amend to Change from Automatic to Manual Closure of Containment Purge & Exhaust Valves in Mode 6 ML20128C2071992-11-0606 November 1992 Notification of 921202 Meeting W/Util in Rockville,Md to Discuss Upcoming Refueling Outage Plans & Recent Plant Performance ML20127C4131992-07-24024 July 1992 Responds to 910322 Memo Requesting Assistance on Whether 10CFR50.59 Review Should Have Been Performed for Broken Pipe in Station Drainage & Discharge Sys Releasing low-level Radioactivity Onsite ML20059D2711990-08-0606 August 1990 Discusses Review of State of Oh & Local Radiological Emergency Response Plans.Determined That No Issues Identified During 890809-09 Exercise to Prevent Finding of Reasonable Assurance for Site ML20148T1891990-04-10010 April 1990 Responds to Request for Info Re Congressional Inquiries on Tracking & Closeout of Issues Raised Re Incident Investigation Team (IIT) Investigations of Plants.Actions Assigned by EDO in Response to Plant IITs Addressed ML20246N8091989-08-30030 August 1989 Notification of 890907 Meeting W/Util in Rockville,Md to Discuss Exemption from App R to 10CFR50 for Specific Configuration of Pressurizer Instrumentation ML20244A4611989-06-0606 June 1989 Notification of 890615 Meeting W/Util & Westinghouse Owners Group in Rockville,Md to Discuss Reactor Vessel Support Embrittlement ML20247B9481989-03-23023 March 1989 Notification of 890404 Meeting W/Util in Rockville,Md to Discuss Applicability of Test of Bunker Ramo Penetrations for Meeting Environ Qualification Requirements at Facility ML20195G8751988-11-25025 November 1988 Forwards Signed,Original Order Modifying License Issued to Util on 881121 for Transmittal to Fr for Publication.W/O Encl ML20206A1171988-11-0808 November 1988 Notification of 881117 Meeting W/Util in Rockville,Md to Discuss Proposed Fuel Enrichment Change Application ML20151U1241988-08-11011 August 1988 Forwards Fr Notice Extending Time for Comments on Request of Cleveland Electric Illuminating Co & Toledo Edison Co to Suspend Plant Antitrust License Conditions ML20151T3371988-08-0909 August 1988 Notification of 880817 Meeting W/Util in Rockville,Md to Discuss SER on ATWS Issued by Staff to Utils ML20151E1981988-07-14014 July 1988 Notification of 880721 Meeting W/Util in Rockville,Md to Discuss Licensee Response to Questions on Fire Protection Program ML20150E8851988-07-0707 July 1988 Notification of 880725 Meeting W/Util in Rockville,Md to Discuss Status of Refuel Outage & Configuration of Mgt Sys ML20151L9961988-06-16016 June 1988 Discusses Engineering Insp DRP-07 Re Safety Sys Outage Mod Involving Auxiliary Feedwater Sys.Insp Identified Several Instances of Inadequate Engineering Review.Addl Insp of Engineering Design Review Requested in Jul-Aug ML20195E5431988-06-10010 June 1988 Submits Status Summary Rept on Multi-Plant Action B-66, Natural Circulation Cooldown. Near-term OLs Should Not Be Added to Safety Issues Mgt Sys Listing for Subj Action ML20154R8651988-06-0808 June 1988 Requests That Encl Slides from 860627 Presentation to ACRS Re Maint Review at Facility Be Placed in PDR ML20148T0851988-06-0303 June 1988 Discusses Multiplant Action F-58,Items II.K.3.30 & II.K.3.31 Compliance w/10CFR50.46 ML20151N8041988-04-18018 April 1988 Notification of 880428 Meeting W/Util in Oak Harbor,Oh Re Technical Discussions Concerning Plant Control Ctr ML20151B7141988-04-0606 April 1988 Comments on Cj Papariello 880323 Memo Re Insp of Allegations at Plants.Significance of Allegations Low & Do Not Warrant Immediate Review & Closure ML20148E3191988-03-18018 March 1988 Notification of 880330 Meeting W/Util in Oak Harbor,Oh to Discuss SALP 6 Rept ML20150B9671988-03-11011 March 1988 Requests That Encl 870911 Memo from J Scinto Be Included in Docket Files.Memo Relates to 870122 Application for Amend to License NPF-3 Re Organization Changes IA-88-165, Discusses Topics for Senior Mgt Meeting & Submits Partial Listing of Facilities Where Vendor Support Has Been Problem,Vendor Involved & Component/Issue of Interest. W/Copyrighted Matl1988-03-0909 March 1988 Discusses Topics for Senior Mgt Meeting & Submits Partial Listing of Facilities Where Vendor Support Has Been Problem,Vendor Involved & Component/Issue of Interest. W/Copyrighted Matl ML20155K2001988-03-0909 March 1988 Discusses Topics for Senior Mgt Meeting & Submits Partial Listing of Facilities Where Vendor Support Has Been Problem,Vendor Involved & Component/Issue of Interest. W/Copyrighted Matl ML20236U6471987-11-27027 November 1987 Forwards Safety Evaluation Re Assessment of Errors in Util Analysis for Small Break Loca,Per 860718 Request.Incorrect Values Used in Analysis Result in Incomplete Compliance W/ 10CFR50,App K.Performance Requirements of 10CFR50.46 Met ML20153E9181987-11-16016 November 1987 Forwards Oct 1987 Significant Intergovernmental Activities & Issues Rept.Rept Represents Combined Efforts of NRC Regional State Liaison Officers,State,Local & Indian Tribes Programs Staff & Regional State Agreement Representatives ML20236A6081987-10-20020 October 1987 Notification of 871113 Meeting W/Util in Bethesda,Md to Discuss Util Reassessment of Programs,Priorities & Planned Fifth Refueling Outage Work Items ML20236A6171987-10-20020 October 1987 Notification of 871029 & 30 Meetings W/Util in Bethesda,Md to Discuss Facility Fire Protection Program ML20236A9711987-10-19019 October 1987 Forwards Biweekly Status Rept for 870926-1009 1999-03-26
[Table view] |
Text
i August 20, 1986 b
02 MEMORANDUM FOR: Harold R. Denton, Director Office of Nuclear Reactor Regulation James M. Taylor, Director Office of Inspection and Enforcement FROM: C. J. Heltemes, Jr., Director Office for Analysis and Evaluation of Operational Data
SUBJECT:
CASE STUDY REPORT - OPERATIONAL EXPERIENCE INVOLVING TURBINE OVERSPEED TRIPS Following the resolution of all peer review comments, we have finalized and enclosed our case study report on operating experience involving auxiliary feedwater (AFW) system turbine cverspeed trips in PWR plants. The study also includes a review of BWR high pressure coolant injection HPCI system turbine and reactor core isolation cooling (RCIC) system turbine overspeed trip events. The events studied occurred during the period from early 1972 to September 1985 and were identified primarily from Licensee Event Reports (LERs). Each event involved a steam turbine designed and built by the Terry Corporation and a governor supplied by the Woodward Governor Company. This study was performed in response to action item 8(f) of_the actions directed by the EDO to respond to the NRC staff investigations of the June 9, 198b event at Davis-Besse. A total of 128 turbine overspeed trip events involving AFW, HPCI and RCIC systems were reviewed. Overspeed trips of AFW turbines were found to be relatively widespread and one of the major causes for loss of operability or unavailability of AFW systems.
Our study concludes that the dominant attributed causes of AFW turbine overspeed trips are speed control problems associated with the governor, and trip and reset problems associated with the trip valve and overspeed trip mechanism. The governor speed control problems involve: (1) slow response of the governor during quick startup, (2) entrapped oil in the Woodward Model PG-PL governcr speed setting cylinder, (3) incorrect governor setting, and (4) water induction into the turbine. The trip and reset problems sten from the complexity of reset operations and a lack of trip position indication, lhese problems are primarily the result of inadequate performance by plant personnel, inadequate procedures, and insufficient design considerations.
lhe study contains several recommendations to prevent or reduce the overspeed trip problems. Implementation of the recommended actions should significantly improve AFW system reliability and availability. The principal recommendations are as follows:
i 8609090194 PDR 860902ADOCK 05000346 PDR S
~.
)
I Harold R. Danton James M. Taylor
- 1. Alleviate the effect of slow response of the governor valve during the turbine startup transient by implementing a steam bypass modification for turbines equipped with a Woodward Model EG governor.
I 2. Avoid entrapped oil in the speed. setting cylinder by establishing
. administrative controls for bleeding off the entrapped oil, installing a
- controllable dump valve, or providing indication in the control room ,
for a spinning turbine.
l 3. Ensure the adequacy of the existing vendor-supplied calibration procedures for governor speed setting.
f
- 4. Prevent water induction into the turbine by providing adequate provisions for condensate removal from the steam supply line to the AFW turbine.
- 5. Minimize trip and reset problems by assessing the adequacy of the existing procedural instruction, upgrading the training program, and providing local indication as well as control room indication for trip and reset. conditions.
It is requested that NRR address our recommendations in their programs to
,- improve' AFW system reliability (particularly in response to action items by i the ED0 in connection with the NRC staff investigations of the June 9, 1985 i eventatDavis-Besse).
Finally, the enclosed report recognizes that IE has already issued Information Notice 86-14 "PWR. Auxiliary Feedwater Turbine Control Preblems" which addresses j some aspects of the overspeed problems related to entrapped oil and water induction. However, it is- also requested that IE issue another information i notice to draw attention to the other AFW turbine overspeed trip cause
, categories identified in the. case-study.
< If you have any question regarding this study, please feel free to contact l Chuck Hsu of my staff. Mr. Hsu can be reached at X_24443.
or p ud sip od bF C. J. Moltomes, Jr.
C. J. Heltemes, Jr., Director l Office for Analysis and Evaluation
- of Operational Data
Enclosure:
As Stated cc: See next page 1 DISTRIBUTION: o PDR CHsu WLanning AE0D SF EBrown KBlack
- AEOD CF MChiramal MWilliams ROAB SF Plam FHebdon i ROAB CF SRubin CJHeltemes
- See next sheet for previous concurrence I 0FC : ROAB. : SC:ROAB : BC:ROAB : DD:AE D : D:AE0D : :
!NAME: CHsu:nc : MChiramal : SRubin : FH : CH emes : :
DATE : 8/15/86* : 8/15/86* : 8/15/86* : 8/w /86 : 8/40/86 : :
OFFICIAL RECORD COPY
.. g Harold R. Denton 2. Avoid entrapped oil in the speed setting cylinder by establishing administrative controls for bleeding off the entrapped oil, installing a controllable dump valve, or providing indication in the control room for a spinning turbine.
- 3. Ensure the adequacy of the existing vendor-supplied calibration procedures for governor speed setting.
- 4. Prevent water induction into the turbine by providing adequate provisions for condensate removal from the steam supply line to the AFW turbine.
- 5. Minimize trip and reset problems by assessing the adequacy of the existing procedural instruction, upgrading the training program, and providing local indication as well as control room indication for trip and reset conditions.
It is requested that NRR address our recommendations in their programs to improve AFW system reliability (particularly in response to action items by the ED0 in connection with the NRC staff investigations of the June 9,1985 event at Davis-Besse).
Finally, the enclosed report recognizes that IE has already issued Information Notice 86-14 "PWR Auxiliary Feedwater Turbine Control Problems" which addresses some aspects of the overspeed problems related to entrapped oil and water induction. By separate memorandum, we have requested that IE issue another information rotice to draw attentior to the other AFW turbine overspeed trip cause categories identified in the case study.
If you have any question regarding this study, please feel free to contact Chuck Hsu of my staff. Mr. Psu can be reached at X_24443.
l C. J. Heltemes, Jr., Director Office for Analysis and Evaluation of Operational Data
Enclosure:
As Stated cc: See next page DISTRIBUTION:
PDR CHsu WLanning l AEOD SF EBrown KBlack AE0D CF MChiramal MWilliams R0AB SF Plam FHebdon ROAB CF SRubin CJHeltemes OFC : 8 AB : SC:ROAB : BC:ROAB : DD:AEOD : D:AEOD : :
_____:f,..G.[dk___:_f.pf..pa_:-___________:-___________:-___________:____________:___________
'NAME : C su:nc : MChiramal : SRubin : FHebdon : CHeltemes : :
!DATE : 8//f /86 : 8//[/86 : 8/6/86 : 8/ /86 : 8/ /86 : :
l OFFICIAL RECORD COPY
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