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Category:CORRESPONDENCE-LETTERS
MONTHYEARML20217M3801999-10-21021 October 1999 Forwards Insp Rept 50-263/99-06 on 990813-0923.Four Violations of NRC Requirements Identified & Being Treated as non-cited Violations Consistent with App C of Enforcement Policy ML20217G0711999-10-13013 October 1999 Forwards Insp Rept 50-263/99-12 on 990913-17.No Violations Noted ML20216J2491999-09-30030 September 1999 Ack Receipt of 980804,990626 & 0720 Ltrs in Response to GL 98-01,suppl 1, Year 2000 Readiness of Computer Sys at Npps. Staff Review Has Concluded That All Requested Info Has Been Provided ML20217B1421999-09-30030 September 1999 Informs That on 990902,NRC Staff Completed mid-cicle Plant Performance Review of Monticello Nuclear Generating Station. Staff Conducted Reviews for All Operating NPPs to Integrate Performance Information & to Plan for Insp Activities ML20212K9131999-09-30030 September 1999 Refers to 990920 Meeting Conducted at Monticello Nuclear Generating Station to Discuss Initiatives in Risk Area & to Establish Dialog Between SRAs & PRA ML20216J8091999-09-24024 September 1999 Informs That New Diaphragm Matl Has Corrected Sticking Problem Associated with Increased Control Rod Drive Scram Times.Augmented Testing of Valves at Monticello Has Been Discontinued ML20216G4341999-09-24024 September 1999 Forwards Exam Rept 50-263/99-301 on 990823-26.Violation Occurred & Being Treated as Ncv,Consistent with App C of Enforcement Policy.Test Was Administered to Two Applicants. Both Applicants Passed All Sections of Exam ML20212G7171999-09-24024 September 1999 Submits Semiannual Status Update on Project Plans for USAR Review Project & Conversion to Its.Conversion Package Submittal Continues to Be Targeted for Aug of 2000 ML20212G9801999-09-23023 September 1999 Refers to Resolution of Unresolved Items Identified Re Security Alarm Station Operations at Both Monitcello & Prairie Island ML20212F0901999-09-21021 September 1999 Confirms Discussion Between M Hammer & Rd Lanksbury to Have Routine Mgt Meeting on 991005 in Lisle,Il.Purpose of Meeting to Discuss Improvement Initiatives in Areas of Operations & Equipment Reliability ML20212A9761999-09-0909 September 1999 Submits 1999 Annual Rept of Any Changes or Errors Identified in ECCS Analytical Models or Applications ML20217A5751999-09-0909 September 1999 Forwards Individual Exam Results for Licensee Applicants Who Took Aug 1999 Initial License Exam.Without Encls ML20211Q6981999-09-0606 September 1999 Informs That NRC Tentatively Scheduled Initial Licensing Exam for Monticello Operator License Applicants During Wks of 010604 & 11.Validation of Exam Will Occur at Station During Wk of 010514 ML20211L1981999-09-0101 September 1999 Forwards Insp Rept 50-263/99-05 on 990702-0812.No Violations Noted ML20211K7971999-09-0101 September 1999 Informs That Util Reviewed Rvid as Requested in NRC .Recommended Corrections Are Listed ML20211K2591999-08-27027 August 1999 Forwards NSP Co Fitness for Duty Program Performance Data for Six Month Period Ending 990630 ML20211F9961999-08-26026 August 1999 Forwards Effluent & Waste Disposal Semi-Annual Rept for 990101-990630, Revised Effluent & Waste Disposal Semi-Annual Rept for 980701-981231 & Revs to ODCM for Monitcello Nuclear Generating Plant ML20211C9501999-08-23023 August 1999 Forwards Rev 17 to Monticello Nuclear Generating Plant USAR, Updating Info in USAR to Reflect Implementation of Increase in Licensed Core Thermal Power from 1,670 Mwt to 1,775 Mwt.Rept of Changes,Tests & Experiments Not Included ML20210U1831999-08-12012 August 1999 Revises 980202 Commitment Re GL 96-06, Assurance of Equipment Operability & Containment Integrity During Design- Basis Accident Conditions ML20210T9601999-08-12012 August 1999 Provides Rept on Status of Util RPV Feedwater Nozzle Insps Performed in Response to USI A-10 Re BWR Nozzle Cracking ML20210Q0341999-08-0404 August 1999 Forwards SE Granting Licensee 980724 Relief Request 10 Re Third 10-year Interval ISI Program Plan,Entitled, Limited Exam ML20210H0861999-07-28028 July 1999 Forwards Insp Rept 50-263/99-04 on 990521-0701.No Violations Noted.Licensee Conduct at Monticello Facility Characterized by safety-conscious Operations,Sound Engineering & Maint Practices & Appropriate Radiological Controls ML18107A7051999-07-20020 July 1999 Provides Suppl Info Which Supersedes Info in 990625 Ltr in Response to NRC RAI Re GL 98-01, Y2K Readiness of Computer Sys at Nuclear Power Plants. ML20212H3191999-07-16016 July 1999 Forwards Aug 1999 Monticello RO Exam Package,Including Revised Outlines.All Changes Are in Blue Font ML20209G5621999-07-14014 July 1999 Forwards Insp Rept 50-263/99-11 on 990621-24.No Violations Noted.Objective of Insp,To Determine Whether Monticello Nuclear Generating Station Emergency Plan Adequate & If Station Personnel Properly Implemented Emergency Plan ML20196J5351999-07-0202 July 1999 Discusses GL 92-01,Rev 1,Supp 1, Rv Integrity, Issued by NRC on 950515 & NSP Responses & 980917 for Monticello Npp.Informs That Staff Revised Info in Rvid & Released Info as Rvid Version 2 ML20196J9681999-07-0101 July 1999 Informs That in Sept 1998,Region III Received Rev 20 to Portions of Util Emergency Plan Under 10CFR50.54(q).Based on Determination That Changes Do Not Decrease Effectiveness of Licensee Emergency Plan,No NRC Approval Required ML20209B6151999-06-25025 June 1999 Responds to NRC Request for Info Re Y2K Readiness at Nuclear Power Plants.Gl 98-01 Requested Response on Status of Facility Y2K Readiness by 990701.Y2K Readiness Disclosure Attached ML20196H2291999-06-24024 June 1999 Responds to Administrative Ltr 99-02,dtd 990603,requesting Licensee to Provide Estimate of Licensing Action Submittals Anticipated.Four New Submittals Per Year Are Anticipated ML20207D5851999-05-25025 May 1999 Submits Info Re Partial Fulfillment of License Conditions Placed on Amend 101,which Approved Use of Ten Exceptions for 24 Months Subject to Listed App C Conditions.Util Will Submit Second Rept to Obtain Approval for Continued Use ML20206S0911999-05-17017 May 1999 Forwards Response to NRC 990324 RAI Re Proposed Amend to pressure-temp Limits & Surveillance Capsule Withdrawal Schedule, .Supporting Calculations Also Encl ML20206N5601999-05-13013 May 1999 Informs That NRC Office of Nuclear Reactor Regulation Reorganized Effective 990328.As Part of Reorganization,Div of Licensing Project Mgt Created.Cm Craig Will Be Section Chief for Monticello Npp.Organization Chart Encl ML20206G2181999-05-0505 May 1999 Discusses Completion of Licensing Action for GL 96-01, Testing of Safety-Related Logic Circuits, Dtd 960110,for Plant ML20206G4901999-05-0404 May 1999 Forwards Staff Review of Licensee 960508 Response to NRC Bulletin 96-002, Movement of Heavy Loads Over Sf,Over Fuel in Rc or Over Safety-Related Equipment, .Overall, Responses Acceptable.Tac M95610 Closed ML20206G7741999-05-0303 May 1999 Forwards Insp Rept 50-263/99-02 on 990223-0408.One Violation Occurred & Being Treated as non-cited Violation,Consistent with App C of Enforcement Policy ML20206D1651999-04-27027 April 1999 Forwards Radiation Environ Monitoring Program for MNGP for Jan-Dec 1998, Per Plant TS 6.7.C.1.Ltr Contains No New NRC Commitments or Modifies Any Prior Commitments ML20205N0821999-04-12012 April 1999 Forwards SE of NSP Response to NRC GL 95-07, Pressure Locking & Thermal Binding of Safety-Related Power-Operated Gate Valves. Licensee Adequately Addressed Actions Requested in GL ML20205N4811999-04-0909 April 1999 Forwards Licensing Requalification Insp Rept 50-263/99-10 on 990308-12.No Violations Noted.However,Inspectors Through Observation of Simulator Scenario Exams Noted Difficulties in Ability of SM to Simultaneously Implement Duties of SM ML20205N5301999-04-0909 April 1999 Discusses Arrangements Made on 990406 for Administration of Licensing Exams at Monticello Nuclear Generating Station During Wk of 990823.Requests That Exam Outlines Be Submitted by 990128 & Supporting Ref Matls by 990719 ML20196K7831999-03-31031 March 1999 Forwards Decommissioning Funding Status Rept for Monticello & Prairie Island Nuclear Generating Plants,Per Requirements of 10CFR50.75(f)(1) ML20205H5731999-03-29029 March 1999 Submits Required 1998 Actual & 1999 Projected Cash Flow Statements for Monticello Nuclear Generating Plant & PINGP, Units 1 & 2.Encl Contains Proprietary Info.Proprietary Info Withheld,Per 10CFR2.790(b)(1) ML20205C4851999-03-26026 March 1999 Informs That on 990203,NRC Staff Completed PPR of Nuclear Plant.Staff Conducts Reviews for All Operating NPPs to Develop an Integrated Understanding of Safety Performance ML20205C6561999-03-26026 March 1999 Submits Semiannual Update on Project Plans for USAR Review Project & Conversion to ITS ML20205A5881999-03-24024 March 1999 Forwards Request for Addl Info Re Submittal Requesting Rev of pressure-temperature Limits & Surveillance Capsule Withdrawal Schedule ML20204H4711999-03-18018 March 1999 Forwards SER Concluding That Util Established Acceptable Program to Verify Periodically design-basis Capability of safety-related MOVs at Monticello & Adequately Addressed Actions Requested in GL 96-05 ML20207H5161999-03-11011 March 1999 Forwards Insp Rept 50-263/99-01 on 990112-0222.No Violations Noted ML20207F4091999-02-28028 February 1999 Forwards Fitness for Duty Program Performance Data for Six Month Period from 980701-981231,IAW 10CFR26.71 ML20207F6741999-02-24024 February 1999 Forwards Summary of Nuclear Property Insurance Maintained at Monticello & Prairie Island Nuclear Generating Plants ML20207F6901999-02-23023 February 1999 Forwards Effluent & Waste Disposal Semi-Annual Rept for 980701-981231, Off-Site Radiation Dose Assessment for 980101-981231 & Revised Effluent & Waste Disposal Semi- Annual Rept for 980101-980630, for Monticello ML20203F2541999-02-10010 February 1999 Informs That Beginning 990216,DE Hills Will Be Chief of Operations Branch Which Includes Operator Licensing Function 1999-09-09
[Table view] Category:OUTGOING CORRESPONDENCE
MONTHYEARML20217M3801999-10-21021 October 1999 Forwards Insp Rept 50-263/99-06 on 990813-0923.Four Violations of NRC Requirements Identified & Being Treated as non-cited Violations Consistent with App C of Enforcement Policy ML20217G0711999-10-13013 October 1999 Forwards Insp Rept 50-263/99-12 on 990913-17.No Violations Noted ML20216J2491999-09-30030 September 1999 Ack Receipt of 980804,990626 & 0720 Ltrs in Response to GL 98-01,suppl 1, Year 2000 Readiness of Computer Sys at Npps. Staff Review Has Concluded That All Requested Info Has Been Provided ML20217B1421999-09-30030 September 1999 Informs That on 990902,NRC Staff Completed mid-cicle Plant Performance Review of Monticello Nuclear Generating Station. Staff Conducted Reviews for All Operating NPPs to Integrate Performance Information & to Plan for Insp Activities ML20212K9131999-09-30030 September 1999 Refers to 990920 Meeting Conducted at Monticello Nuclear Generating Station to Discuss Initiatives in Risk Area & to Establish Dialog Between SRAs & PRA ML20216G4341999-09-24024 September 1999 Forwards Exam Rept 50-263/99-301 on 990823-26.Violation Occurred & Being Treated as Ncv,Consistent with App C of Enforcement Policy.Test Was Administered to Two Applicants. Both Applicants Passed All Sections of Exam ML20212G9801999-09-23023 September 1999 Refers to Resolution of Unresolved Items Identified Re Security Alarm Station Operations at Both Monitcello & Prairie Island ML20212F0901999-09-21021 September 1999 Confirms Discussion Between M Hammer & Rd Lanksbury to Have Routine Mgt Meeting on 991005 in Lisle,Il.Purpose of Meeting to Discuss Improvement Initiatives in Areas of Operations & Equipment Reliability ML20217A5751999-09-0909 September 1999 Forwards Individual Exam Results for Licensee Applicants Who Took Aug 1999 Initial License Exam.Without Encls ML20211Q6981999-09-0606 September 1999 Informs That NRC Tentatively Scheduled Initial Licensing Exam for Monticello Operator License Applicants During Wks of 010604 & 11.Validation of Exam Will Occur at Station During Wk of 010514 ML20211L1981999-09-0101 September 1999 Forwards Insp Rept 50-263/99-05 on 990702-0812.No Violations Noted ML20210Q0341999-08-0404 August 1999 Forwards SE Granting Licensee 980724 Relief Request 10 Re Third 10-year Interval ISI Program Plan,Entitled, Limited Exam ML20210H0861999-07-28028 July 1999 Forwards Insp Rept 50-263/99-04 on 990521-0701.No Violations Noted.Licensee Conduct at Monticello Facility Characterized by safety-conscious Operations,Sound Engineering & Maint Practices & Appropriate Radiological Controls ML20209G5621999-07-14014 July 1999 Forwards Insp Rept 50-263/99-11 on 990621-24.No Violations Noted.Objective of Insp,To Determine Whether Monticello Nuclear Generating Station Emergency Plan Adequate & If Station Personnel Properly Implemented Emergency Plan ML20196J5351999-07-0202 July 1999 Discusses GL 92-01,Rev 1,Supp 1, Rv Integrity, Issued by NRC on 950515 & NSP Responses & 980917 for Monticello Npp.Informs That Staff Revised Info in Rvid & Released Info as Rvid Version 2 ML20196J9681999-07-0101 July 1999 Informs That in Sept 1998,Region III Received Rev 20 to Portions of Util Emergency Plan Under 10CFR50.54(q).Based on Determination That Changes Do Not Decrease Effectiveness of Licensee Emergency Plan,No NRC Approval Required ML20206N5601999-05-13013 May 1999 Informs That NRC Office of Nuclear Reactor Regulation Reorganized Effective 990328.As Part of Reorganization,Div of Licensing Project Mgt Created.Cm Craig Will Be Section Chief for Monticello Npp.Organization Chart Encl ML20206G2181999-05-0505 May 1999 Discusses Completion of Licensing Action for GL 96-01, Testing of Safety-Related Logic Circuits, Dtd 960110,for Plant ML20206G4901999-05-0404 May 1999 Forwards Staff Review of Licensee 960508 Response to NRC Bulletin 96-002, Movement of Heavy Loads Over Sf,Over Fuel in Rc or Over Safety-Related Equipment, .Overall, Responses Acceptable.Tac M95610 Closed ML20206G7741999-05-0303 May 1999 Forwards Insp Rept 50-263/99-02 on 990223-0408.One Violation Occurred & Being Treated as non-cited Violation,Consistent with App C of Enforcement Policy ML20205N0821999-04-12012 April 1999 Forwards SE of NSP Response to NRC GL 95-07, Pressure Locking & Thermal Binding of Safety-Related Power-Operated Gate Valves. Licensee Adequately Addressed Actions Requested in GL ML20205N4811999-04-0909 April 1999 Forwards Licensing Requalification Insp Rept 50-263/99-10 on 990308-12.No Violations Noted.However,Inspectors Through Observation of Simulator Scenario Exams Noted Difficulties in Ability of SM to Simultaneously Implement Duties of SM ML20205N5301999-04-0909 April 1999 Discusses Arrangements Made on 990406 for Administration of Licensing Exams at Monticello Nuclear Generating Station During Wk of 990823.Requests That Exam Outlines Be Submitted by 990128 & Supporting Ref Matls by 990719 ML20205C4851999-03-26026 March 1999 Informs That on 990203,NRC Staff Completed PPR of Nuclear Plant.Staff Conducts Reviews for All Operating NPPs to Develop an Integrated Understanding of Safety Performance ML20205A5881999-03-24024 March 1999 Forwards Request for Addl Info Re Submittal Requesting Rev of pressure-temperature Limits & Surveillance Capsule Withdrawal Schedule ML20204H4711999-03-18018 March 1999 Forwards SER Concluding That Util Established Acceptable Program to Verify Periodically design-basis Capability of safety-related MOVs at Monticello & Adequately Addressed Actions Requested in GL 96-05 ML20207H5161999-03-11011 March 1999 Forwards Insp Rept 50-263/99-01 on 990112-0222.No Violations Noted ML20203F2541999-02-10010 February 1999 Informs That Beginning 990216,DE Hills Will Be Chief of Operations Branch Which Includes Operator Licensing Function ML20202B7191999-01-26026 January 1999 Discusses 990125 Telcon with T Witschen & D Mcneil Re Arrangements for NRC to Inspect Licensed Operator Requalification Program at Monticello Nuclear Generating Station.Insp Planned for Week of 990308 ML20199H8321999-01-20020 January 1999 Forwards Insp Rept 50-263/98-18 on 981201-990111.No Violations Were Identified.Conduct of Activities at Monticello Facility Was Generally Characterized by safety- Conscious Operations & Sound Maint Practices ML20199G7721999-01-14014 January 1999 Forwards Request for Addl Info Re GL 88-20, Individual Plant Exam of External Events (IPEEE) for Severe Accident Vulnerabilities, Issued in June 1991 ML20206R8631999-01-12012 January 1999 Informs That Staff Has Prepared TS Interpretation of Requirements for Extending Surveillance Intervals at Plant,Per NRC Request ML20199E4791999-01-0606 January 1999 Forwards SER Accepting Licensee 951116,960214 & 0524 Responses to NRC Bulletin 95-002, Unexpected Clogging of Residual Heat Removal Pump Strainer While Operating in Suppression Pool Cooling Mode, for Monticello ML20206R8741999-01-0404 January 1999 Discusses Clarification of Understanding of Safety Evaluation Related to Deviation from Emergency Procedure Guidelines for Monticello.Staff Agrees with NSP Characterization & Resolution of Issues ML20198R2001998-12-30030 December 1998 Forwards Insp Rept 50-263/98-19 on 981214-18.No Violations Noted.Purpose of Insp Was to Review Plant Chemistry Program, PASS & REMP ML20198P0501998-12-28028 December 1998 Informs of Completion of Review of Relief Request 9 Re Third 10-year Interval ISI Program Plan,Entitled Use of High Alloy/High Nickel Calibr Block for Dissimilar Metal Welds. Supporting SE Encl ML20198G0761998-12-21021 December 1998 Acks Receipt of Notifying NRC That Commitment Noted in Is Complete Re Tornado Effects on Reactor Bldg Superstructure ML20198D0181998-12-15015 December 1998 Informs That as Part of PRA Implementation Plan,Commission Assigned Two SRAs to Each Regional Ofc.Sras Will Routinely Assess Licensee Event Repts,Plant Events,Insp Findings & EAs from Risk Perspective ML20198B7721998-12-14014 December 1998 Forwards Insp Rept 50-263/98-16 on 981014-1130 & Notice of Violation Re Fire Brigade Drill Participation ML20198D0641998-12-10010 December 1998 Forwards SE Accepting Licensee 971118 Request for Review & Approval of Deviation from BWROG Epg,Rev 4,NEDO-31331, March,1997.Deviation Will Permit Rev of Plant EOPs to Recognize 2/3 Core Height as Adequate for Core Cooling ML20196C2411998-11-24024 November 1998 Forwards Insp Rept 50-263/98-17 on 981026-30.No Violations Noted.Security Dept self-assessment Efforts Continue to Be Very Strong ML20196D5641998-11-20020 November 1998 Discusses 981104 Insp Resource Planning Meeting for Monticello & Advises of Planned Insp Effort for Next 6 Months at Plant.Info Provided to Min Resource Impacts on Staff & to Allow for Rescheduling Conflicts to Be Resolved ML20195J8811998-11-19019 November 1998 Informs That EOP Flow Charts C.5-1100 RPV Control, Rev 5 & C.5-1100... Rev 6 Marked Proprietary & Submitted as Attachments 3 & 4 to Util Will Be Withheld from Public Disclosure Per 10CFR2.790(b)(5) ML20196G6081998-11-19019 November 1998 Submits Correction to Which Advises Licensee That EOP Flow Charts, C.5-1100 RPV Control, Rev 5 & C.5-1100 RPV Control, Rev 6,marked Proprietary,Will Be Withheld from Public Disclosure.Ltr Reissued to Correct Date of Issuance ML20195E3321998-11-12012 November 1998 Forwards SE Concluding That Licensee Implementation Program to Resolve USI A-46 at Facility Has Adequately Addressed Purpose of 10CFR50.54(f) Request.Usi A-46 Program Was Established in Response to GL 87-02 ML20196D7291998-11-10010 November 1998 Forwards Insp Rept 50-263/98-15 on 980831-1014.No Violations Noted.Investigation Team Assembled by Station Mgt to Determine Root Cause of Offgas Sys Problem Was Thorough & Aggressive ML20154L2951998-10-0909 October 1998 Informs That Effective 981011,project Mgt Responsibility for Plant Will Be Transferred from Tj Kim to CF Lyon.Cf Lyon May Be Contacted at Listed Number ML20154F4971998-10-0606 October 1998 Ack Receipt of Informing NRC of Steps Taken to Correct Violations Noted in Insp Rept 50-263/98-09 Issued on 980730 ML20154J2501998-10-0202 October 1998 Forwards Audit of Year 2000 Program at Monticello Nuclear Generating Plant on 980915-17 as Followup to NRC GL 98-01, Year 2000 Readiness of Computer Systems at Nuclear Power Plants, Issued on 980511 ML20153C4611998-09-21021 September 1998 Submits Comments on Draft Environ Impact Statement for Minnesota Lake Superior Coastal Program 1999-09-09
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,' tributions s AEC Fuelle Lveument Room Docket File, DR Feadin DEL Reading HLPrice cnwek f17 Q Doeket No. 50 263 JUN 3 YR1 va ann CHenderson SHanauer ECase HShapar PAMorris RGBoyd Mr. Russel Hatling, Director Com. Bemey Minnesota Envirmnental Control Comm. Johnson Citizens Associatite Comm. Lercon 144 Mc1 bourne benue, S.E. Secretariat (2)
Minneapolis, Minnesota 55414 GErtter Chairman tear Mr. IIstlingt /
' Ibis is in respmse to your telegram to Chairman Seaborg regarding the Monticello Buclear Plant. I an enclosing a copy of the Cranissico's statement regarding the current AEC Degulatory Staff review of recently developed information on emerEency core cooling systems for nuclear pcwr plants. You will note that the review of this recent information is not regarded as the type of problem requiring the shutdown of operating nuclear power plants.
I will be glad to send you the conclusions of this review when complete.
Since rely,
'( signed ) Herod b MM Harold L. Price Director of Itegulation Ibc1caure:
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PDR ADOCK 05000263 H PDR
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UNITED STATES -
I h ATOMIC ENERGY COMMISSION W A$HINGTON, D.C. 20545 i
I l
l No. O-80 FOR IMMEDIATE RELEASE
Contact:
Frank Ingram i i Tel. 973-3446 ,
j 973-5371 (Copies) ,
l NOTE TO EDITORS AND CORRESPONDENTS: P 4
The Atomic Energy Commission has received a number of
- inquiries and has noted press interest in recent letters .
- which the AEC Regulatory Staff has sent to Atomic Safety and Licensing Boards , license applicants , and other parties to public hearings, on a review of emergency core cooling, i a back-up system which is part of the " defense-in-depth" concept of power reactor safety. These letters -- which stated the staf f is re-evaluating these systems -- were sent in the last three weeks and made public at that time.
l The AEC Regulatory Staff is reviewing recently developed i information on omorgency core cooling systems to assure that i
the necessary margins of safety provided by these systems are i
! being maintained in present designs of nuclear power plants.
f Emergency core cooling systems are one of the back-up l
safety features being included in nuclear power plants. They i I are designed to provide water to cool the fuel in the event th a t , for some reason, there is a loss of the normal reactor cooling water. The likelihood that the emergency core cooling system will need to be used is very small, but AEC believes it is prudent to include such systems as part of the " defense-in-depth" which protects the public.
Nuclear plants also are equipped with many other safety systems designed both to prevent serious accidents and to limit the consequences of accidents in the remote event they should occur.
The use of recently developed, improved techniques for calculating fuel cladding temperatures following a loss of coolant accident, and the results of some preliminary safety research experiments have indicated that the predicted margins in emergency core cooling system performance for reactors may not be as large as were earlier predicted.
(more) 1 i
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' Tho AEC has for many years conducted a large number of
( tests and experiments on various aspects of reactor response to loss of coolant and power reactor safety at the National Reactor Testing Station in Idaho and elsewhere. The recent small mock-up tests at NRTS were not designed to represent the response of an actual operating nuclear power plant to a loss of coolant accident. There were significant differences in the experimental system which was tested as compared to an operating reactor. The significance of these tests to the calculational techniques used to assure the effectiveness of emergency core cooling systens in nuclear power plants is being evaluated.
The Regulatory Staff's task force of senior technical ocople is seeking to determine whether improvements are needed in emergency core cooling system design and, if so, what those improvements should be. The results of the review will be taken into account in the licensing of nuclear power plants.
The review is part of AEC's continuing effort to assure that nuclear power plant designs are evaluated in the light of the best current technical information available.
If it is determined that there should be changes in design or operation of presently licensed plants, these changes will be included as part of the regulatory process.
This is not the type of problem requiring the shut down of operating plants.
weeks.
Results of the AEC review should be available in a few There may be some delays in proceedings involving con-struction permits or operating licenses for plants now under-going licensing review, but none of these plants was expected to be producing significant amounts of power in time for this summer's " peak load" periods.
} May 27, 1971 i
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i .' UNITED STATES a
ATOMIC ENERGY COMMISSION ,
- . WASHINGTON, D.C. 40640
<p, . j
-;-~,yc(j . , ,
'/q Docket No. 50-263 u
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4
. . :j . Mr. Russel Hatling, Director
+
Minnesota Environmental Control
, Citizens Association '
! 144 Melbc'ttne Avenue, S.E.
Minneapolis, Minnesota 55414
Dear Mr. Hat ling:
This is in response to your telegram to Chairman Seaborg rogarding the Monticello Nuclear Plant. I am enclosing a copy of the Commission's statomont regarding the current AEC Regulatory Staff review of recently developed informa-tion on omorgency core cooling systems for nuclear power ,
plants. You will note that the review of this recent information is not regarded as the type of problem requiring the shutdown of operating nuclear power plants. i Sincerely, Wk h h & ph & k ribe -
N.
f% (4/ 7 d .
Harold L. Prico >
Director of Regulation
Enclosure:
Statement q
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