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Category:INTERNAL OR EXTERNAL MEMORANDUM
MONTHYEARML20217A9811999-10-30030 October 1999 Forwards Sept 1999 Performance Indicator Data Rept for Revised Reactor Oversight Process Pilot Program.Rept Includes Data Through Aug 1999 (two-thirds of 3rd Quarter of 1999) for 13 Units at 9 Pilot Sites ML20211K8611999-09-0101 September 1999 Informs That There Has Been Some Confusion Re Recently Issued ODCM Generic Section Rev Which Needs to Be Clarified. Clarifications Are Listed ML20210P1361999-08-0404 August 1999 Notification of 990817 Meeting with Util in Rockville, Maryland to Discuss Status of Licensing Actions Submitted by Comm Ed & Plan for Proposed Licensing Workshop ML20210F6981999-07-27027 July 1999 Discusses 990430 Request for Waiver of 10CFR170 Fees for Certain Insp Efforts Re NRR Pilot Regulatory Oversight Program.Determined That Thirteen Plants in Pilot Program Will Be Exempted from 10CFR170 Fees for Insp Efforts ML20196H8491999-06-28028 June 1999 Forwards June 1999 Performance Indicator (PI) Data Rept for Revised Reactor Oversight Process Pilot Program.Rept Constitutes Second Monthly PI Data Submittal from Pilot Plant Licensees,Which Includes Data Through May 1999 ML20196K5541999-06-10010 June 1999 Forwards Request for Addl Info Re 10CFR50.46(A) Annual Rept. Note to File for TACs MA5336 & MA5337 Supercedes & Closes TACs MA1597,MA1598 & MA4426 ML20206S9241999-05-19019 May 1999 Forwards Insp Plans Re Prairie Island & Quad Cities,Which Identified Insp Activities That Would Be Completed at Facilities Over Next 6 to 12 Months ML20210F7021999-04-30030 April 1999 Requests Waiver of Fees for Thirteen Dockets That Compromise Plant Population for NRR Pilot Regulatory Oversight Program. Purposes of Pilot Program Described in Commission Papers SECY-99-007 & SECY-99-007A ML20205J5971999-04-0707 April 1999 Forwards SER Accepting Util 980910 Proposal to NRC, Requesting Transfer of Indirect Control of Licenses DPR-29 & DPR-30 from Midamerican Energy Holding Co to Calenergy Co, Inc ML20205J5931999-04-0707 April 1999 Informs of Court Cases Pending for California Energy Co in State of California ML20198N9281998-12-30030 December 1998 Notification of 990115 Meeting with Ceco in Rockville, Maryland to Discuss Progress & Actions Being Taken by Quad Cities to Resolve Fire Protection (App R) Issues & to Address Latest IPEEE Risk Evaluations ML20196J8621998-12-0404 December 1998 Discusses Three Plants,Evaluated for Consideration as Abnormal Occurrences & Other Event of Interest.Oconee & Quad Cities Plants Are Being Considered as AOs & Big Rock Point Being Considered as Other Event Interest IA-99-134, Submits Addendum to SE for Proposed Merger of Calenergy, Midamerican & Indirect Transfer of Licenses for Plant Units 1 & 2.SE & Indirect Transfer of Licenses Should Be Approved1998-11-25025 November 1998 Submits Addendum to SE for Proposed Merger of Calenergy, Midamerican & Indirect Transfer of Licenses for Plant Units 1 & 2.SE & Indirect Transfer of Licenses Should Be Approved ML20206F3461998-11-25025 November 1998 Submits Addendum to SE for Proposed Merger of Calenergy, Midamerican & Indirect Transfer of Licenses for Plant Units 1 & 2.SE & Indirect Transfer of Licenses Should Be Approved ML20155H5301998-11-0505 November 1998 Notification of 981119 Meeting with Ceco in Rockville,Md to Discuss Progress & Actions Util Taking to Resolve Fire Protection (App R) Issues Since Last Public Meeting on 980910 ML20239A0881998-09-0202 September 1998 Notification of 980910 Meeting W/Util in Rockville,Md to Discuss Progress & Actions Quad Cities Taking to Resolve Fire Protection (App R) Issues Since Closure of CAL on 980522 ML20237E4261998-08-27027 August 1998 Notification of 980909 Meeting W/Calenergy Co,Midamerican Energy Co & Commonwealth Edison Co in Rockville,Md to Discuss Proposed Merger of Midamerican Energy Holdings Co & Calenergy Co,Inc & Requirements of 10CFR50.80 for Transfer ML20237E3131998-08-26026 August 1998 Forwards for Public Release,Info Re NRC SMM Held on 980714-15.Summary of January 1998 NRC SMM & Watch List Removal Evaluation Factors Also Encl ML20236V5021998-07-30030 July 1998 Notification of 980819 Meeting W/Commonwealth Edison Co in Rockville,Md to Discuss Inclusion of Emergency Core Cooling System Flow Measurement Uncertainties at Quad Cities Nuclear Power Station in loss-of-coolant Accident Analyses ML20249A5991998-06-15015 June 1998 Notification of 980619 Meeting W/Util in Rockville,Md to Discuss Reliance on Containment Overpressure at Quad Cities Np Station in Net Positive Suction Head Calculations for Core Spray & Low Pressure Coolant Injection Pumps ML20248A5991998-05-27027 May 1998 Notification of 980611 Meeting W/Util in Two White Flint North to Discuss Reliance on Containment Overpressure at Quad Cities Nuclear Power Station in Net Positive Suction Head Calculations for Core Spray ML20216H6971998-03-17017 March 1998 Notification of 980326 Meeting W/Commonwealth Edison Co in Lisle,Il to Discuss Comed Request to Consolidate near-site Emergency Operations Facility Into Single Central EOF ML20199E9941998-01-28028 January 1998 Forwards Rev of 980127 Notice of Significant Licensee Meeting W/Location of Meeting Added ML20199F0151998-01-27027 January 1998 Revised Notification of 980206 Meeting W/Location of Meeting Added,W/Ceco in Lisle,Illinois to Discuss Licensee Update of Methodology & Technical Resolutions to Current 10CFR50 App R Issues & Scope & Type of Issues Requiring Review by NRC ML20199E0461998-01-27027 January 1998 Notification of Significant Licensee Meeting W/Util on 980206 to Discuss Licensee Update of Methodology & Technical Resolutions to Current 10CFR50,App R Issues & to Discuss Scope & Type of Issues Requiring Review & Approval by NRC ML20198A6311997-12-30030 December 1997 Notification of Significant Licensee Meeting W/Util on 980109 in Lisle,Il to Discuss Apparent Violations & Other Issues Identified in NRC Inspection Repts 50-254/97-27 & 50-265/97-27 ML20212B4321997-10-22022 October 1997 Notification of Significant Licensee Meeting W/Util on 971105 in Lisle,Il to Discuss Apparent Violations Described in NRC Ltr to Lw Pearce, ML20217D4261997-09-30030 September 1997 Informs of Scheduled Visits W/Nuclear Services at Gpu on Nov 14th & Visit at Commonwealth Edison on Dec 3rd & Would Like to Receive Any Info Available.Supporting Documentation Encl ML20236N3851997-09-0909 September 1997 Discusses TS Clarification at Quad Cities Re Interpretation of Application of Action 3 of TS 3/4.5.A,in Event High Pressure Cooling Injection Pump Made Inoperable for Surveillance Testing Concurrent W/Inoperable LPCI Pump ML20236N2881997-08-13013 August 1997 Informs of Completed Review of Plant TS 3/4.5.A, ECCS Operating, & Provides Comments Which Addresses Inoperable HPCI Sys,Per Region III 970718 Memo ML20151L7801997-08-0404 August 1997 Notification of 970820 Meeting W/Commonwealth Edison Co in Rockville,Md to Discuss Comed Response for Quad Cities IPEEE Conceptual Engineering Designs for long-term Resolution for Safe Shutdown Enhancements ML20197B9141997-07-23023 July 1997 Forwards Safety Evaluation Re Concrete Expansion Anchor Safety Factors for High Energy Line Break Restraints,In Response to Region III 960920 Request ML20148D4741997-05-28028 May 1997 Notification of Meeting W/Ce on 970602 in Rockville,Md to Discuss Concerns Addressed in Re Actions That Should Be Considered by CE for Plant,Units 1 & 2,in Response to IPEEE Fire Analysis Results ML20141F4831997-05-19019 May 1997 Notifies of 970522 Meeting W/Util in Rockville,Md to Discuss NRC Recommendations Re Action Which Should Be Considered by Commonwealth Edison for Plant,Units 1 & 2 IA-97-178, Forwards Partially Withheld Background Briefing Package in Preparation for 970425 Meeting Between Comed & Commission1997-04-18018 April 1997 Forwards Partially Withheld Background Briefing Package in Preparation for 970425 Meeting Between Comed & Commission ML20217D5461997-04-18018 April 1997 Forwards Partially Withheld Background Briefing Package in Preparation for 970425 Meeting Between Comed & Commission ML20147J2391997-04-0909 April 1997 Notification of Meeting on 970416 W/Util in Rockville,Md to Discuss Overall Response & Present Addl Details Re Performance Indicators Used to Monitor Performance Stations ML20137G5911997-03-13013 March 1997 Forwards Safety Evaluation Re Proposed TS Changes to Reflect Transition of Fuel Supplier from GE to Siemens Power Corp at Plants Unit 1 & 2 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 ML20210N4271996-12-0202 December 1996 Informs About Drop in Meeting on 961203 for Update on Industry Restructuring & Deregulation,Unicom Strategic Planning & Mixed Oxide Fuel ML20217D5421996-11-27027 November 1996 Forwards Partially Withheld Background Briefing Package in Preparation for 961203 Meeting Between Comed,Nuclear Strategic Services & Chairman Jackson ML20129K4501996-11-0707 November 1996 Forwards NRC Approved Operator Licensing Exam (Facility Outline & Initial Exam Submittal & as-given Operating Exam) for Tests Administered on 961007-11 ML20217A1841996-11-0101 November 1996 Provides Annual Update of Status of Region III Response to Staff Actions Resulting from Diagnostic Evaluation at Quad Cities Nuclear Power Station ML20210N3761996-08-12012 August 1996 Informs About Meeting on 960513 to Brief Chairman Jackson on Comed Response to Deregulation ML20217D4761996-07-31031 July 1996 Forwards Background Briefing Package in Prepartion of 960813 Meeting Between Commonwealth Edison Co & Chairman Jackson. Purpose of Visit to Discuss Recent Organizational Changes at Comed & Company Mgt Focus for Immediate Future ML20210N3381996-05-14014 May 1996 Discusses Courtesy Visit to Ceco on 960513 Re Listed Plants ML20210N2681995-11-13013 November 1995 Discusses Paritially Withheld Chairman Briefing by Ceco on 951116 ML20217D5321995-11-0909 November 1995 Forwards Partially Withheld Background Briefing Package in Preparation for 951116 Meeting Between Commission & Senior Comed Mgt.Purpose of Visit to Discuss Performance at Each of Sites & Challenges & Issues Needed to Be Addressed ML20210N3971995-10-12012 October 1995 Informs of Courtesy Visit on 951011 to Util to Discuss Listed Topics.List of Attendees Encl ML20210N3701995-10-0505 October 1995 Forwards Background Briefing Package in Preparation for 951011 Meeting W/Company Executives & Chairmam Jackson 1999-09-01
[Table view] Category:MEMORANDUMS-CORRESPONDENCE
MONTHYEARML20217A9811999-10-30030 October 1999 Forwards Sept 1999 Performance Indicator Data Rept for Revised Reactor Oversight Process Pilot Program.Rept Includes Data Through Aug 1999 (two-thirds of 3rd Quarter of 1999) for 13 Units at 9 Pilot Sites ML20211K8611999-09-0101 September 1999 Informs That There Has Been Some Confusion Re Recently Issued ODCM Generic Section Rev Which Needs to Be Clarified. Clarifications Are Listed ML20210P1361999-08-0404 August 1999 Notification of 990817 Meeting with Util in Rockville, Maryland to Discuss Status of Licensing Actions Submitted by Comm Ed & Plan for Proposed Licensing Workshop ML20210F6981999-07-27027 July 1999 Discusses 990430 Request for Waiver of 10CFR170 Fees for Certain Insp Efforts Re NRR Pilot Regulatory Oversight Program.Determined That Thirteen Plants in Pilot Program Will Be Exempted from 10CFR170 Fees for Insp Efforts ML20196H8491999-06-28028 June 1999 Forwards June 1999 Performance Indicator (PI) Data Rept for Revised Reactor Oversight Process Pilot Program.Rept Constitutes Second Monthly PI Data Submittal from Pilot Plant Licensees,Which Includes Data Through May 1999 ML20196K5541999-06-10010 June 1999 Forwards Request for Addl Info Re 10CFR50.46(A) Annual Rept. Note to File for TACs MA5336 & MA5337 Supercedes & Closes TACs MA1597,MA1598 & MA4426 ML20206S9241999-05-19019 May 1999 Forwards Insp Plans Re Prairie Island & Quad Cities,Which Identified Insp Activities That Would Be Completed at Facilities Over Next 6 to 12 Months ML20210F7021999-04-30030 April 1999 Requests Waiver of Fees for Thirteen Dockets That Compromise Plant Population for NRR Pilot Regulatory Oversight Program. Purposes of Pilot Program Described in Commission Papers SECY-99-007 & SECY-99-007A ML20205J5971999-04-0707 April 1999 Forwards SER Accepting Util 980910 Proposal to NRC, Requesting Transfer of Indirect Control of Licenses DPR-29 & DPR-30 from Midamerican Energy Holding Co to Calenergy Co, Inc ML20205J5931999-04-0707 April 1999 Informs of Court Cases Pending for California Energy Co in State of California ML20198N9281998-12-30030 December 1998 Notification of 990115 Meeting with Ceco in Rockville, Maryland to Discuss Progress & Actions Being Taken by Quad Cities to Resolve Fire Protection (App R) Issues & to Address Latest IPEEE Risk Evaluations ML20196J8621998-12-0404 December 1998 Discusses Three Plants,Evaluated for Consideration as Abnormal Occurrences & Other Event of Interest.Oconee & Quad Cities Plants Are Being Considered as AOs & Big Rock Point Being Considered as Other Event Interest IA-99-134, Submits Addendum to SE for Proposed Merger of Calenergy, Midamerican & Indirect Transfer of Licenses for Plant Units 1 & 2.SE & Indirect Transfer of Licenses Should Be Approved1998-11-25025 November 1998 Submits Addendum to SE for Proposed Merger of Calenergy, Midamerican & Indirect Transfer of Licenses for Plant Units 1 & 2.SE & Indirect Transfer of Licenses Should Be Approved ML20206F3461998-11-25025 November 1998 Submits Addendum to SE for Proposed Merger of Calenergy, Midamerican & Indirect Transfer of Licenses for Plant Units 1 & 2.SE & Indirect Transfer of Licenses Should Be Approved ML20155H5301998-11-0505 November 1998 Notification of 981119 Meeting with Ceco in Rockville,Md to Discuss Progress & Actions Util Taking to Resolve Fire Protection (App R) Issues Since Last Public Meeting on 980910 ML20239A0881998-09-0202 September 1998 Notification of 980910 Meeting W/Util in Rockville,Md to Discuss Progress & Actions Quad Cities Taking to Resolve Fire Protection (App R) Issues Since Closure of CAL on 980522 ML20237E4261998-08-27027 August 1998 Notification of 980909 Meeting W/Calenergy Co,Midamerican Energy Co & Commonwealth Edison Co in Rockville,Md to Discuss Proposed Merger of Midamerican Energy Holdings Co & Calenergy Co,Inc & Requirements of 10CFR50.80 for Transfer ML20237E3131998-08-26026 August 1998 Forwards for Public Release,Info Re NRC SMM Held on 980714-15.Summary of January 1998 NRC SMM & Watch List Removal Evaluation Factors Also Encl ML20237A3611998-08-12012 August 1998 Staff Requirements Memo Re Briefing on Operating Reactors & Fuel Facilities on 980729 in Rockville,Maryland.Relative to Discussion About Quad-Cities,Commission Requested Addl Info on Schedule for Permanent Fire Protection Issues ML20236V5021998-07-30030 July 1998 Notification of 980819 Meeting W/Commonwealth Edison Co in Rockville,Md to Discuss Inclusion of Emergency Core Cooling System Flow Measurement Uncertainties at Quad Cities Nuclear Power Station in loss-of-coolant Accident Analyses ML20249A5991998-06-15015 June 1998 Notification of 980619 Meeting W/Util in Rockville,Md to Discuss Reliance on Containment Overpressure at Quad Cities Np Station in Net Positive Suction Head Calculations for Core Spray & Low Pressure Coolant Injection Pumps ML20248A5991998-05-27027 May 1998 Notification of 980611 Meeting W/Util in Two White Flint North to Discuss Reliance on Containment Overpressure at Quad Cities Nuclear Power Station in Net Positive Suction Head Calculations for Core Spray ML20216H6971998-03-17017 March 1998 Notification of 980326 Meeting W/Commonwealth Edison Co in Lisle,Il to Discuss Comed Request to Consolidate near-site Emergency Operations Facility Into Single Central EOF ML20199E9941998-01-28028 January 1998 Forwards Rev of 980127 Notice of Significant Licensee Meeting W/Location of Meeting Added ML20199F0151998-01-27027 January 1998 Revised Notification of 980206 Meeting W/Location of Meeting Added,W/Ceco in Lisle,Illinois to Discuss Licensee Update of Methodology & Technical Resolutions to Current 10CFR50 App R Issues & Scope & Type of Issues Requiring Review by NRC ML20199E0461998-01-27027 January 1998 Notification of Significant Licensee Meeting W/Util on 980206 to Discuss Licensee Update of Methodology & Technical Resolutions to Current 10CFR50,App R Issues & to Discuss Scope & Type of Issues Requiring Review & Approval by NRC ML20198A6311997-12-30030 December 1997 Notification of Significant Licensee Meeting W/Util on 980109 in Lisle,Il to Discuss Apparent Violations & Other Issues Identified in NRC Inspection Repts 50-254/97-27 & 50-265/97-27 ML20212B4321997-10-22022 October 1997 Notification of Significant Licensee Meeting W/Util on 971105 in Lisle,Il to Discuss Apparent Violations Described in NRC Ltr to Lw Pearce, ML20217D4261997-09-30030 September 1997 Informs of Scheduled Visits W/Nuclear Services at Gpu on Nov 14th & Visit at Commonwealth Edison on Dec 3rd & Would Like to Receive Any Info Available.Supporting Documentation Encl ML20236N3851997-09-0909 September 1997 Discusses TS Clarification at Quad Cities Re Interpretation of Application of Action 3 of TS 3/4.5.A,in Event High Pressure Cooling Injection Pump Made Inoperable for Surveillance Testing Concurrent W/Inoperable LPCI Pump ML20236N2881997-08-13013 August 1997 Informs of Completed Review of Plant TS 3/4.5.A, ECCS Operating, & Provides Comments Which Addresses Inoperable HPCI Sys,Per Region III 970718 Memo ML20151L7801997-08-0404 August 1997 Notification of 970820 Meeting W/Commonwealth Edison Co in Rockville,Md to Discuss Comed Response for Quad Cities IPEEE Conceptual Engineering Designs for long-term Resolution for Safe Shutdown Enhancements ML20197B9141997-07-23023 July 1997 Forwards Safety Evaluation Re Concrete Expansion Anchor Safety Factors for High Energy Line Break Restraints,In Response to Region III 960920 Request ML20148D4741997-05-28028 May 1997 Notification of Meeting W/Ce on 970602 in Rockville,Md to Discuss Concerns Addressed in Re Actions That Should Be Considered by CE for Plant,Units 1 & 2,in Response to IPEEE Fire Analysis Results ML20141F4831997-05-19019 May 1997 Notifies of 970522 Meeting W/Util in Rockville,Md to Discuss NRC Recommendations Re Action Which Should Be Considered by Commonwealth Edison for Plant,Units 1 & 2 IA-97-178, Forwards Partially Withheld Background Briefing Package in Preparation for 970425 Meeting Between Comed & Commission1997-04-18018 April 1997 Forwards Partially Withheld Background Briefing Package in Preparation for 970425 Meeting Between Comed & Commission ML20217D5461997-04-18018 April 1997 Forwards Partially Withheld Background Briefing Package in Preparation for 970425 Meeting Between Comed & Commission ML20147J2391997-04-0909 April 1997 Notification of Meeting on 970416 W/Util in Rockville,Md to Discuss Overall Response & Present Addl Details Re Performance Indicators Used to Monitor Performance Stations ML20137G5911997-03-13013 March 1997 Forwards Safety Evaluation Re Proposed TS Changes to Reflect Transition of Fuel Supplier from GE to Siemens Power Corp at Plants Unit 1 & 2 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 ML20210N4271996-12-0202 December 1996 Informs About Drop in Meeting on 961203 for Update on Industry Restructuring & Deregulation,Unicom Strategic Planning & Mixed Oxide Fuel ML20217D5421996-11-27027 November 1996 Forwards Partially Withheld Background Briefing Package in Preparation for 961203 Meeting Between Comed,Nuclear Strategic Services & Chairman Jackson ML20129K4501996-11-0707 November 1996 Forwards NRC Approved Operator Licensing Exam (Facility Outline & Initial Exam Submittal & as-given Operating Exam) for Tests Administered on 961007-11 ML20217A1841996-11-0101 November 1996 Provides Annual Update of Status of Region III Response to Staff Actions Resulting from Diagnostic Evaluation at Quad Cities Nuclear Power Station ML20210N3761996-08-12012 August 1996 Informs About Meeting on 960513 to Brief Chairman Jackson on Comed Response to Deregulation ML20217D4761996-07-31031 July 1996 Forwards Background Briefing Package in Prepartion of 960813 Meeting Between Commonwealth Edison Co & Chairman Jackson. Purpose of Visit to Discuss Recent Organizational Changes at Comed & Company Mgt Focus for Immediate Future ML20210N3381996-05-14014 May 1996 Discusses Courtesy Visit to Ceco on 960513 Re Listed Plants ML20210N2681995-11-13013 November 1995 Discusses Paritially Withheld Chairman Briefing by Ceco on 951116 ML20217D5321995-11-0909 November 1995 Forwards Partially Withheld Background Briefing Package in Preparation for 951116 Meeting Between Commission & Senior Comed Mgt.Purpose of Visit to Discuss Performance at Each of Sites & Challenges & Issues Needed to Be Addressed ML20210N3971995-10-12012 October 1995 Informs of Courtesy Visit on 951011 to Util to Discuss Listed Topics.List of Attendees Encl 1999-09-01
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August 29, 1972 NOTE TO D. J. SKOVHOLT The loss of the ECCS suction header support bolts on Quad-Citics Unit 2 was reported by telex on May 29, 1972. We received our copy on ::ay 30. Taiu was followed by tne IL-day report from CECO dated June 7, 1972. received on June 13, 1972.
Bf the ti=u we received the report, RO had taaen the following actions.
- 1. Distributed a blue letter (D. Ziemann was not on tue distribution list).
- 2. Investigated the problam, with a consultant (Ric.iard A.
Lofy), and reviewed CECO's proposed corrective actions including tests.
- 3. Evaluated tue incident and directed Ceco. by letter dated June 22, l>72. to perform additional inspectionc on Quad-Citics and Dresden Units and report resulta to RO within 10 daya. We have not received CECO's response.
\
- 4. ;4de a prescutation of the incident, RO's evaluation and recommendations, and corrective actions to t;.c ACRS during tae Junc Committee meetings.
- 5. Aavised us that CECO would submit a report of tneir test results to the regulatory staff by about August 1, 1972. We have not yet received the report. In response to our telepnone inquiry on about August 15, CECO advised us that GE was still working on the report.
Based on the above and CECO's report of corrective measures, we consider no additional action is necessary on our part (without resulting in duplicating the RO efforts) until the test report is submitted. At that time, a technical assistance raquest will be submitted to Technical deview witu pertinent information for their evaluation and recommendations.
8705050120 870428 PDR FOIA Tl .O MAS 87-40 PDR
D. J. SKOVHOLT August 29, 1972 To date Technical Review has not participated in the evaluation of this event. RO has* reviewed information submitted by the licensee, tneir consultant's report, inspected the corrective measures , and made an evaluation. We (Operating Reactors) have reviewed the licensee's report and the RO information. We inspectea the corrective measures at the site on June 15, 1972, two days after receiving the licensee's report and one week af ter RO's blue sheet was issued. Tne corrective measures were acceptable to us as a significant improve-ment over the original design and installation, knowing enat Dresden 2 anu 3 have tue came design as Quad-Cities original design and nave experienced no problems. Tecnnical Review will be asked to review all pertinent information unen ene test results are submitted by the licensee. Waen Technical Review's response is received, we will prepare a final evaluation.
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Local PDR To (N.m. .ae waeu pa riAs.s at=Anas NSIC ITIIE DATE FROM (Name end wast) atuamms G. Fiore111 Attached is a copy of licensee's adequate reply to RO:III
,..g Bulletin No. 72-1.
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Date: June 22, 1972 Directorate of Regulatory Operations Bulletin 72-1 FAILED HANGERS FOR EMERGENCY CORE COOLING SYSTEM SUCTION HEADER We re'cently received,information from the Commonwealth Edison Company concerning a problem found during startup testing of the Quad-Cities 2 boiling water reactor which may relate to the design and long term performance capability of the torus and the emergency core cooling suction header at your facility. The information is as follows:
- s. Description of Circumstances During startup testing the licensee found that four of the pipe hangers which support the 24-inch diameter torus suction header had failed. The 24-inch suction header serves as the main source of water for the emergency core cooling systems. Water is supplied to the header from the torus through four 20-inch diameter pipes spaced 90 deErees apart. The header is supported by three equally spaced sets of vertical and horizontal hangers which are attached to support plates welded to the torus and which are located between each of the four 20-inch pipes which join the suction header to the torus. A total of 12 hangers support the 24-inch suction header.
The reactor was promptly shut down for investigation and repair following the discovery of the failed hangers.
Three of the four failed hangers were located within a 90 degree section of the header and resulted in a maximum sag in the header pipe of approximately six inches within that section. Four 3/4-inch diameter bolts (threaded their entire length), which secured pairs of shackles to the support plates welded to the torus and to the >
24-inch diameter pipe, were found to have failed in double shear.
The cause of the bolt failures has not as yet been determined; however, it is known that the suction header experienced vibration as a result of operational testing of the emergency core cooling system. In addition, the bolt holes, which were formed by flame cutting and punching, were found to be irregularly shaped and poorly aligned.
Chicago Bridge and Iron Company, the contractor for the torus and suction header design and installation, has provided a revised design requiring use of 1-inch diameter high strength bolts with smooth unthreaded bearing surface, and appropriately increased the size of the shackles. The change is being implemented for all the hangers.
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6 Commonwealth Edison Company and General Electric Company plan to conduct additional investigation to determine the effect on the suction header and torus of routine plant operations and testing of the emergency core cooling systems.
We have also 'been informed that the Northern States Power Company's Monticello reactor found one bent suction header hanger bolt and is also currently replacing the hanger bolts with 1-inch diameter bolts.
- b. Action Requested of the Licensee It is requested that you conduct the following inspections for each of your facilities and provide this office with the results of your inspection.
- 1. An inspection of the hangers, shackles and support plates for the torus suction header to assure that all components are in accordance with design, are in proper position, and do not indicate damage.
- 2. Inspect each bolt used to attach the shackle and support plate of each hanger (1) for deformation, (2) to establish that bolts are of the specified design, (3) to establish that specified locking devices are installed and (4) that the bolt shank supporting the header weight from the support and shackle is not threaded in the bearing area.
If the results of your inspection indicate the existence of conditions similar to those described above, or if any problems have previously been experienced with failed hangers or bent hanger bolts at your facility, please include in your response a description of the problem and the corrective action taken or planned, if any, and the date of scheduled completion of any planned corrective action. This information should be provided to this office, in writing, within ten days of your receipt of this letter.
9 9