Letter Sequence Approval |
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Results
Other: 05000266/LER-1979-010-01, /01T-0 on 790620:plant Safeguards Actuation Circuitry Review Indicated Need for Circuitry Changes.Caused by Changes in IEEE Std Since Plant Design.Mods to Four Applicable Safeguard Circuits Will Be Performed, ML19210C482, ML19242D259, ML19253A712, ML19253B006, ML19257A367, ML19257B511, ML19289C679, ML19310A971, ML19323H481, ML19345H544, ML20010E141, ML20027A527, ML20038C635, ML20039A258, ML20040F029, ML20065R665
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MONTHYEARML20027A5271978-11-28028 November 1978
Discusses Possible Dangers of LOCA in Containment Purging During Normal Plant Oper.Requests Either Commitment to Limit Purging or Justification for Continuing.W/Encl ANO 7812080207
Project stage: Other
ML19289C6791979-01-16016 January 1979
Responds to Re Purging During Normal Operation. Need for Purging Has Been Limited,But It Is Essential That Capability of in-containment Activities at Power Be Maintained
Project stage: Other
05000266/LER-1979-010-01, /01T-0 on 790620:plant Safeguards Actuation Circuitry Review Indicated Need for Circuitry Changes.Caused by Changes in IEEE Std Since Plant Design.Mods to Four Applicable Safeguard Circuits Will Be Performed1979-07-0303 July 1979
/01T-0 on 790620:plant Safeguards Actuation Circuitry Review Indicated Need for Circuitry Changes.Caused by Changes in IEEE Std Since Plant Design.Mods to Four Applicable Safeguard Circuits Will Be Performed
Project stage: Other
ML19253A7121979-08-0808 August 1979
Confirms Action Taken as Result of 790803 Telcon Re Util Request to Leave Containment Purge Values Closed Above Cold Shutdown Condition.Proposal Acceptable on one-time Basis
Project stage: Other
ML19242D2591979-08-10010 August 1979
Appreciates Prompt Approval of Request to Purge Containment. Approval Reduced Personnel Inconvenience & man-rem Exposure. Will Pursue Review of Containment Purge Sys
Project stage: Other
ML19253B0061979-09-0606 September 1979
Discusses Containment Purge Valve Operations.Notifies of Potential Mods to Ensure That Valves Will Close Against Containment Pressure Transients.Consultants Will Conduct Studies & Analyses of Potential Mods
Project stage: Other
ML19323H4811979-09-30030 September 1979
Technical Evaluation of Electrical Instrumentation & Control Design Aspects of Override Containment Purge Valve Isolation & Other Engineered Safety Feature Signals for Point Beach Nuclear Power Station,Units 1 & 2
Project stage: Other
ML19210C4821979-11-0101 November 1979
Responds to Re Guidelines for Operability of Containment Purging & Venting Valves During Normal Operations.Evaluation Will Consider Consultant Studies of Potential Mods to Valves
Project stage: Other
ML19257A3671979-11-19019 November 1979
Forwards Interim Position on Containment Purging & Venting During Normal Operation Pending Resolution of Isolation Valve Operability.Commitment to Comply W/Encl Position Should Be Submitted within 45 Days
Project stage: Other
ML19310A9711979-12-27027 December 1979
Requests Preliminary Evaluation of Licensee Response to NRC 791023 Interim Position for Containment Purge & Vent Valve Operation Pending Resolution of Isolation Valve Operability, Generic Item B-24.Evaluation Form Encl
Project stage: Other
ML19257B5111980-01-0909 January 1980
Provides Commitments Sought in NRC .Forwards to Bechtel Re Purge Valve Capability Verification.Nrc Guidelines Will Be Considered During Evaluation of Mods for Improved Purge Valve Reliability
Project stage: Other
ML19257C8081980-01-11011 January 1980
Forwards Safety Evaluation to Be Substituted for Encl in Ltr Per Agreement Reached at 791213 Meeting Re Containment Purge
Project stage: Approval
ML19257C8101980-01-11011 January 1980
Safety Evaluation Approving Electrical,Instrumentation & Control Design Aspects of Override of Containment Purge Valve Isolation,Except Radiation Monitors Used to Initiate Containment Purge Isolation
Project stage: Approval
ML19323H4781980-05-22022 May 1980
Forwards Safety Evaluation Supporting Design Aspects of Containment Purge Valve Isolation Override & Other Engineered Safety Feature Actuation Signals Except Radiation Monitors Which Initiate Containment Purge Isolation
Project stage: Approval
ML19345H5441981-05-0707 May 1981
Documents Basis for Containment Isolation Pressure Setpoint Reported in Item II.E.4.2 of NUREG-0737 Response Per NRC 810414 Telcon.Present 5 Psig Setpoint Considered Realistic & Appropriate
Project stage: Other
ML20008F4471981-07-21021 July 1981
IE Info Notice 81-21, Potential Loss of Direct Access to Ultimate Heat Sink. Provides Addl Info to IE Bulletin 81-03
Project stage: Request
ML20038C6351981-07-31031 July 1981
Srp,Revision 2 to Section 6.2.4, Containment Isolation Sys
Project stage: Other
ML20010E1411981-08-28028 August 1981
Proposed Tech Spec Revision Pages 15.3.6-2,15.3.6-3, 15.4.4-12,15.4.4-15 & 15.4.4-15a Re Testing of Containment Purge Supply & Exhaust Sys Isolation Valves
Project stage: Other
ML20010E1361981-08-28028 August 1981
Application for Amend to Licenses DPR-24 & DPR-27 Submitted as Tech Spec Change Request 68 to Incorporate Addl Restrictions Re Use & Testing of Containment Purge Supply & Exhaust Sys Isolation Valves,Per NRC Request
Project stage: Request
ML20033C0321981-11-23023 November 1981
Second Discovery Progress Rept for Period Ending 811122,per ASLB 811113 Memorandum Order.Licensee 811027 Responses to Wi Environ Decade 811023 Interrogatories Are Not Fully Responsive.Certificate of Svc Encl.Related Correspondence
Project stage: Request
ML20039B0181981-11-24024 November 1981
Requests That Util Remit Class III Fee for Unit 1 & Class I Fee for Unit 2 to Cover Review of 810828 Application for Tech Spec Changes Re Containment Purge Valve Operability
Project stage: Approval
ML20033A9071981-11-24024 November 1981
Advises of Significant Error in 811117 Telcon Transcript
Project stage: Request
ML20039A2581981-12-0707 December 1981
Requests That NRC Reconsider Requirement of Class III Approval Fee During Final Review Re Tech Spec Change Request 68.Changes to Tech Specs Result of NRC Request.No Approval Fee for Amend Review Necessary
Project stage: Other
ML20040F0291982-01-28028 January 1982
Proposed Tech Spec 15.3.6 Re Containment Purge Supply & Exhaust Valves
Project stage: Other
ML20040F0221982-01-28028 January 1982
Application for Amend to Licenses DPR-24 & DPR-27,consisting of Tech Spec Change Request 68 Re Containment Purge Valve Operability
Project stage: Request
ML20065R6651982-10-22022 October 1982
Provides Results of Confirmatory Analysis Demonstrating That Unacceptable Radioactive Release from Containment Would Not Take Place as Result of Small Break LOCA in Which Operator Action Required.Radioactive Release Negligible
Project stage: Other
1980-01-11
[Table View] |
Text
I ENCLOSURE SAFETY EVALUATION POINT BEACH NUCLEAR STATION UNITS 1 & 2 OVERRIDE OF CONTAINMENT PURGE ISOLATION AND OTHlR ENGINEERED SAFETY FEATURE ACTUP. TION SIGNALS INTRODUCTION As a result of Abnormal Occurrence 178-5, the NRC issued a generic letter requesting each licensee to take certain actions. Our review of the licensee's actions included a visit to the plant site.
EVALUATION The enclosed report was prepared for us by Lawrence Livermore Laboratory (LLL) and EG&G, San Ramon, as part of our technical assistance program.
This report provides a technical evaluation of the electrical instru-mentation and control design aspects of the override of containment purge valves isoittien and other engineered safety feature actuation signals and is based upon review of these design aspects against the six staff review criteria provided for the review. The containment purge valves at Point Beach Units 1 and 2 are currently tagged shut and are not being used for purging or venting. All venting and purging is being performed through a two-inch pipe with continuous computer monitoring. The isolation valves for this two-inch pipe also satisfy the staff review criteria cited above.
The technical evaluation concludes that with one exception, the modifications made by the licensee at the plant have brought the designs into conformance with our review criteria. The one exception is that the radiation monitors which initiate containment purge isolation are not safety grade.
CONCLUSION Based upon our review of the consultant's technical evaluation, we conclude that the electrical, instrumentation and control design aspects of the override of containment purge valves isolation and other engi-neered safety feature actuation signals are acceptable with the exception of the radiation monitors used to initiate containment purge isolation. The licensee should be required to provide radiation monitors that are safety grade and satisfy the requirements of IEEE Std. 279-1971.
This requirement has been incorporated into Regulatory Guide 1.141, Revision 1, " Containment Isolation Provisions for Fluid Systems," with a proposed implementation schedule of January 1,1981.
This revision has been endorsed by ACRS and will be required after final staff approval.
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