Letter Sequence Meeting |
|---|
|
Results
Other: ML18113A966, ML18113A996, ML18114A612, ML18114A720, ML19207B079, ML19224C794, ML19225C064, ML19241B211, ML19246A721, ML19261C984, ML19269D615, ML19289F676, ML19344D736, ML20244A550, ML20244A556, ML20244A647
|
MONTHYEARML18113A9961979-03-13013 March 1979
Order to Show Cause Re Potentially Deficient Piping Design. Orders Facility to Be Placed in Cold Shutdown within 48-h
Project stage: Other
ML19282C6771979-03-15015 March 1979
Summary of 790308 Meeting W/S&W to Discuss Pipe Stress Calculations Using Pipestress Code
Project stage: Meeting
ML18113A9671979-03-15015 March 1979
Notification of 790316 & 17 Meeting W/S&W in Bethesda,Md to Discuss Reinstating Operation at Facilities Which Received Shutdown Orders on 790313
Project stage: Meeting
ML18113A9661979-03-20020 March 1979
Summarizes 790320 Telcon W/S&W Re Future Actions to Resolve Outstanding Seismic Concern of Five Shutdown Plants.Requests Reanalysis Results of safety-related Piping Sys & Supports
Project stage: Other
ML19263D8341979-03-26026 March 1979
Discusses 790301 Telcon W/Util & S&W.Nrc Requested Copy of Pipestress Computer Code to Compare W/Nupipe.S&W Stated Policy of Not Releasing Codes or Calculations.Meeting on 790308 for S&W to Bring Pipestress to NRC for Review
Project stage: Meeting
ML18114A5381979-03-29029 March 1979
Assigns Responsibility for Prompt Meeting Notification Re 790313 Show Cause Orders
Project stage: Meeting
ML20244A5561979-03-31031 March 1979
Answer to NRC 790313 Order to Show Cause.Will Reanalyze Seismic Loads on Piping Sys & Will Modify Sys Where Necessary.Expects to Submit Documented Results by 790424. Believes NRC Should Examine S&W Analyses
Project stage: Other
ML20244A5501979-03-31031 March 1979
Forwards Formal Util Response to NRC 790313 Order to Show Cause Re Potentially Unsafe Piping Sys
Project stage: Other
ML19261C9841979-04-0202 April 1979
Forwards Description of Info to Be Documented for NRC Review for Facility.Requests Schedule for Submittal of This Info Prior to Plant Startup
Project stage: Other
ML19344D7361979-04-10010 April 1979
Record of Telcon W/D Ford (Ucs) on 790320 Re Chronology of NRC Activities Re Pipestress Issue
Project stage: Other
ML19289E9721979-04-10010 April 1979
Summary of 790329-30 Meeting W/Util & S&W in Boston,Ma Re Progress to Date & Early Analysis of Pipe Stresses in safety-related Sys
Project stage: Meeting
ML19270G5371979-04-11011 April 1979
Delineates Criterion to Develop plant-specific Info Packages on Site Visits
Project stage: Request
ML20244A6471979-04-17017 April 1979
Licensees Response to 790402 Request of PA Public Util Commission for Hearing & Petition to Intervene Re 790313 Show Cause Order.Urges NRC to Hold Ruling in Abeyance. Certificate of Svc Encl
Project stage: Other
ML19289F0811979-04-20020 April 1979
Summary of 790411-12 Meeting W/Util & S&W in Boston,Ma Re Status of Reanalysis Efforts & Review of Packages Completed to Date
Project stage: Meeting
ML18114A6121979-05-18018 May 1979
Summarizes Procedures & Calculational Techniques Used in Reanalysis of Piping Sys Designed W/Shock II Computer Program.Reanalysis Will Satisfy 790313 Order to Show Cause
Project stage: Other
ML19224C7941979-05-18018 May 1979
Requests Addl Info in Order for NRC to Review Proposed Amplified Response Spectra Using Soil Structure Interaction
Project stage: Other
ML19269D6151979-05-23023 May 1979
Responds to NRC .Forwards Amplified Response Spectra Based on Soil Structure Interaction.Details Result of Analysis of Small Strain Valves of Plus or Minus 50%
Project stage: Other
ML18114A7201979-05-25025 May 1979
Discusses Position Re Use of Soil Structure Interaction for Seismic Pipestress Analyses Being Performed.Approves Methodology,Provided That Seismic Stresses Calculated Are Increased by Factor of 1.5
Project stage: Other
ML19246A7211979-05-25025 May 1979
Submits Identified Areas to Be Addressed During Seismic Pipestress Reanalysis
Project stage: Other
ML19241B2111979-05-25025 May 1979
Discusses Areas to Be Covered in Interim or Final Rept on Seismic Pipestress Reanalysis,Including Stresses Due to Seismic Anchor Movements,Support Stiffness Accountability & Criteria for Pipe Support & Design
Project stage: Other
ML19289F6761979-06-11011 June 1979
Discusses Present Status of Piping Sys Reanalysis.Reanalysis Complete & Two Hydraulic Snubbers Installed.No Pipe Is Overstressed in Event of Safe Shutdown Earthquake.Rept Supporting 790706 Request to Be Submitted by 790618
Project stage: Other
ML19241B8541979-06-14014 June 1979
Summary of 790524 Meeting W/S&W & Util in Bethesda,Md Re Amplified Response Spectra Developed W/Consideration of Soil Structure Interactions
Project stage: Meeting
ML19225C0641979-07-23023 July 1979
Requests Termination of 790313 Order to Show Cause Re safety-related Piping Sys
Project stage: Other
ML19249A7131979-08-0303 August 1979
Draft Safety Evaluation Supporting Resumption of Operation Per Required Mods to Seven Supports,Addition of Three Others & Approval of Two Supports Not Yet Found to Be Acceptable
Project stage: Draft Approval
ML19249A7091979-08-0303 August 1979
Draft Order Not Requiring Continued Shutdown of Facility or Termination Proceeding Initiated by 790313 Order.Analysis & Mod to Fuel Pool Cooling & Purification Sys Required Before Further Use
Project stage: Draft Other
ML19249A7041979-08-0303 August 1979
Forwards for Consideration Draft Order & Draft Safety Evaluation Re Facility Shutdown Per Lack of Assurance That Analysis of Piping Sys for Seismic Loads Provided Proof of Safe Shutdown During Seismic Event
Project stage: Draft Approval
ML19207B0861979-08-0808 August 1979
Safety Evaluation Supporting Order Terminating Proceeding Initiated by 790313 Show Cause Order Re Cold Shutdown Condition.Facility May Resume Power Operation
Project stage: Approval
ML19207B0791979-08-0808 August 1979
Order Terminating Proceeding Initiated by 790313 Show Cause Order Re Cold Shutdown Condition
Project stage: Other
1979-04-02
[Table View] |
Text
.[p atog%,
UNITED STATES
)%,
A NUCLEAR AEGULATORY COMMISSION
- h;M ) h j l WALrl!NGTON, D. C. 20555 g% cyp /
.e March 15,1979
....+
Docket No. 50-334 LICENSEE:
Duquesne Light Company FACILITY:
Beaver Valley Power Station, Unit No.1
SUBJECT:
MEETING
SUMMARY
- PIPE STRESS CALCULATIONS USING "PIPESTRESS" The licensee and Stone and Webster Engineering Corporation met with the staff on March 8,1979 to discuss the pipe stress calcu-lations and methods as reported by R. R. Keimig in a memo to E. L. Jordan dated January 18, 1979.
This memo and follow-up review had been transfered to the Division of Operating Reactors by E. L. Jordan in a memo to R. H. V,llmer dated February 23, 1979.
The attendance list is attached (Attachment 1).
The Stone and Webster Engineering Corporation (S&W) discussed the PIPESTRESS code and selected runs to demonstrate features of the code. They also presented a comparison of a number of calculations on selected pipe systems to compare PIPESTRESS and NUPIPE.
PIPE-STRESS, a proprietary S&W code, was developed and used during the 1960's and early 1970's.
During the review of the PIPESTRESS code, S&W informed the staff that the seismic stresses were computed in the SH0CK2 subroutine using an algebraic intra-modal component summation. This summation, in effect, accounts for both positive and negative components but algebraically adds the two. The resultant component from which the seismic stresses are computed can be significantly less than is thought to be appropriate for that location. Regulatory Guide 1.92 published in 1974 lists the two acceptable methods as absolute summations or the square root of the sum of the squares method.
a The licensees and S&W were then advised that this matter deserves immediate NRR management attention due to the potential for over-stressed piping systems at Beaver Valley as well as other vintage pl ants.
e 790330o 533
.~
~
Meeting Summary for Duquesne Light Company March 15,1979 Following a break in the meeting at noon, at which time NRC t'anagement was first notified of the potential problem, the meeting continued with the licensee, S&W, and NRC management.
In view of not having any specific re-analyses of the Beaver Valley Unit No.1 piping, NRC management requested an immediate effort by the licensee and S&W to identify the piping systems involved and scope the inadequacies by Wednesday, March 14 and reanalyze the effected systems by Friday, March 16.
S&W committed to identify the other plants using PIPESTRESS - SHOCK 2 by Monday, March 12 and 'to notify those utilities as soon as possible. The licensee was directed to inform his Safety Review Committee as soon as possible to assure continued health and safety of the public.
/(
Lt-[
Dave Wigginton, Project Manager Operating Reactors Branch #1 Division of Operating Reactors Attachments:
As Stated cc: w/ attachments See next page M
^
MEETING ON STONE AND WEBSTER ENGINEERING CORPORATION PIPE STRESS CALCULATIONS WITH DUQUESNE LIGHT COMPANY MARCH 8,19/9 Attendees Dave Wigginton NRC ORB 1 John Lynch DLC - ENG J. J. Carey DLC J. M. Cumiskey S&W BVPS1 Project Engineer Don King S&W Engineering Manager Dana Shave S&W Supervisor G. L. Harper S&W Lead Engineer R. G. LaGrange NRC D0R EB S. Hosford NRC D0R EB John Fair NRC 00R EB R. Vollmer*
NRC DOR AD S&P A. Schwencer NRC 00R ORB 1 V. Noonan NRC 00R EB K. Wichman NRC EB V. Stello NRC 00R and others
- Attendance at the afternoon management meeting, some part time.
Meeting Summary for March 15,1979 Duquesne Light Company Docket File NRC PDR Local PDR ORB 1 Reading NRR Reading H. Denton E. Case V. Stello D. Eisenhut B. Grimes D. Davis D. Ziemann P. Check G. Lainas A. Schwencer R. Reid T. Ippolito V. Noonan J. McGough Project Manager OELD OI&E(3)
ACRS (16)
C. Parrish NRC Participants TERA J. R. Buchanan Licensee