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Category:INTERNAL OR EXTERNAL MEMORANDUM
MONTHYEARML20217M6061999-10-20020 October 1999 Notification of 991102 Meeting with Util in Port Gibson,Ms to Discuss Bases for Emergency Preparedness Plan Change Submitted in & Supplemented by 990120 & 0715 Ltrs IR 05000416/19990021999-09-10010 September 1999 Notification of Significant Licensee Meeting with Entergy Operations,Inc on 991018 to Discuss Listed Topics Identified in NRC Insp Repts 50-416/99-02,99-03 & 99-06 ML20211K7171999-09-0202 September 1999 Forwards Ineel Technical Ltr Rept, Evaluation of Fuel Pin Failure Timing in Boiling Water Reactors Dated 990730.Rept Used for Review of BWROG Rept on Revised Source Term Accident Analysis ML20211H4441999-08-27027 August 1999 Notification of Significant Meeting with Util on 990916 & 17 in Arlington,Tx to Improve Utility & NRC Understanding of Industry & Regulatory Perspectives on Current Issues ML20209G2421999-07-14014 July 1999 Notification of 990722 Meeting with License in Rockville, MD to Discuss Changes in EOI Licensing Organization Including Division of Responsibilities within New EOI Corporate Licensing Group ML20196F0391999-06-23023 June 1999 Notification of 990707 & 08 Meeting with EOI in Conference 1 at GGNS Energy Svc Ctr to Discuss Low Power Shutdown Risk Assessment Methods & Associated Probabilistic Risk Assessment Model ML20207A2551999-05-18018 May 1999 Notification of 990603 Meeting with EOI in Rockville,Md to Discuss EOI Submittal on BWROG Source Term Analysis & Possible Related Future Amend Requests from EOI ML20205R8871999-04-20020 April 1999 Notification of 990504 Meeting with Util in Rockville,Md to Discuss Proposal to Submit Consolidated Security Plan for Util Sites ML20205B8871999-03-26026 March 1999 Notification of 990415 Meeting with Utils in Knoxville,Tn to Visit Test Site & Discuss Test Program for ECCS Suppression Pool Suction Strainer.Context of Meeting Considered Entirely Proprietary ML20204B3041999-03-15015 March 1999 Notification of Licensee Meeting with Util in Energy Svc Ctr,Grand Gulf Site on 990415 to Discuss Plant Performance Review Results.Meeting Open to Public ML20195G1121998-11-17017 November 1998 Notification of 981201-02 Meeting with Entergy Operations in Taft,Louisianna to Conduct Joint Workshop for Licensing Personnel from Entergy & Nrc,Project Directorate IV-1 ML20151X1651998-09-14014 September 1998 Notification of Significant Licensee Meeting W/Util on 980929 to Discuss Emergency Preparedness Activities & Issues ML20151U7971998-09-0808 September 1998 Notifies of 980929 Meeting with Util in Rockville,Md to Discuss Level of Instructions & Details for Transferring Quality Assurance Plan Details from Current Program Plans at Four Sites to Std Quality Assurance Program Plan ML20153H6671998-09-0808 September 1998 Revised Notification of 981007 Meeting with Util to Discuss Level of Instructions & Details for Transferring QA Plan Details from Current Program Plans at Four Sites to Std Program Plan at All Sites.Originally Scheduled for 980929 ML20238F5861998-08-28028 August 1998 Notification of 980909 Meeting w/BWR/6S:EOI & Listed Utils in Rockville,Md to Discuss W/Nrc Planned Applications by Licensees to Reduce Operability Requirements During Refueling Outages ML20237A2811998-08-12012 August 1998 Notification of 980827 Meeting W/Nrc & Util in Rockville,Md to Discuss Level of Instructions & Details for Transferring QA Plan Details from Current Program Plans at Four Sites ML20249A2101998-06-11011 June 1998 Notification of 980702 Meeting W/Util in Rockville,Md to Discuss Level of Instructions & Details for Transferring Quality Assurance Plan Details from Current Program Plans at Four Sites to Std Quality Assurance Program Plan for Site ML20248M0751998-06-0909 June 1998 Notification of 980625 Meeting W/Util in Rockville,Md to Discuss Installation & Design of Suppression Pool ECCS Strainer to Meet NRC Bulletin 96-003 IR 05000416/19983011998-05-26026 May 1998 Forwards NRC Operator Licensing Exam Rept 50-416/98-301 for Tests Administered on 980330-0403 ML20248B4181998-05-26026 May 1998 Forwards NRC Operator Licensing Exam Rept (Including Completed & Graded Tests) for Tests Administered on 980330- 0403 ML20216D6351998-04-13013 April 1998 Notification of 980416 Meeting W/Util in Rockville,Md to Discuss Entergy Operations,Inc Initial Proposal to Standardize Security Plans for Listed Plants ML20217E8471998-03-26026 March 1998 Notification of Significant Licensee Meeting W/Util on 980402 to Discuss Entergy Operations,Inc Annual Performance Assessment ML20216H9441998-03-19019 March 1998 Notification of 980331 Meeting W/Util in Rockville,Md for Licensee to Brief Staff on Risk Mgt for Upcoming 9th Refueling Outage Scheduled to Begin on 980411.Licensee Will Do Presentation to Meet NRC Bulletin 96-003 ML20216J4051998-03-18018 March 1998 Forwards SER Authorizing Licensee 980211 & 0310 Ltrs, Requesting Approval of Alternative Reactor Weld Exam,Per Provisions of 10CFR50.55a(a)(3)(i) & 10CFR50.55a(g)(6)(ii) for Plant for Next 2 Operating Cycles ML20216C8601998-03-11011 March 1998 Notification of 980331 Meeting W/Util in Rockville,Md to Discuss Design of Suppression Pool Strainer to Meet Bulletin 96-03 ML20217F2521998-03-11011 March 1998 Notification of 980331 Meeting W/Util in Rockville,Md to Discuss Design of Suppression Pool Strainer to Meet NRC Bulletin 96-003.Meeting Cancelled as of 980326 ML20197B8721998-03-0505 March 1998 Notification of 980401 Meeting W/Util in Jackson,Ms to Discuss Licensing Issues & Regulatory Performance Efficiencies W/Licensing Staff for Plants.Meeting Agenda Encl ML20203B4131998-02-0505 February 1998 Notification of 980319 Meeting W/Entergy Operations,Inc,In Rockville,Md to Discuss Level of Instructions & Details of Transferring QA Plan Details from Current Program Plans at Four Sites to Standard QA Program Plan for Use at All Sites ML20198M8351998-01-12012 January 1998 Notification of 980122 Meeting W/Util in Rockville,Md to Discuss Site Licensing Status for Listed Plants & to Explore Ways to Standardize Licensing Submittals & Issuances ML20198M7531998-01-12012 January 1998 Notification of Meeting W/Entergy Operations,Inc,On 980123 in Rockville,Md to Discuss Plans to Change Radiological Emergency Response Plan ML20198K0791997-10-15015 October 1997 Notification of 971022 Meeting W/Entergy Operations,Inc in Rockville,Md Re Standard Quality Assurance Manual for Entergy Sites ML20217D0461997-09-29029 September 1997 Notification of Significant Licensee Meeting W/Util on 971029 to Discuss Systematic Assessment of Licensee Performance ML20141E8501997-06-27027 June 1997 Notifies of 970710 Meeting W/Licensee in Rockville,Md Re Appeal of Decision by Nrc,In ,That Changes in Rev 28.001-95 of Plant Emergency Plan Not within 10CFR50.54(q) & Can Not Be Implemented W/O Prior NRC Approval ML20137W6841997-04-15015 April 1997 Notification of 970502 Meeting W/Listed Attendees in Jackson,Mi.Meeting Agenda Encl ML20137F2351997-03-24024 March 1997 Summary of 970207 Meeting W/Listed Attendees in Rockville,Md to Discuss Nuclear Energy Inst Concerns Re Graded Quality Assurance Activities W/Volunteer Plants ML20137C9201997-03-20020 March 1997 Forwards Documentation of Meeting Conducted in Region 4 Office on 970225 to Discuss NRC Enforcement Policy as Applied to Nonescalated Enforcement ML20135F8581997-03-13013 March 1997 Notification of 970424 Licensee Meeting W/Util in Arlington, Tx to Discuss Current Performance ML20135F0921997-03-0606 March 1997 Notification of Significant Licensee Meeting W/Util on 970319 to Discuss Current Performance.Meeting Cancelled ML20135D8531997-03-0303 March 1997 Notification of 970325 Meeting W/Util in Port Gibson,Ms to Discuss MOV Thurst Methodology Developed by Util.Subj Methodology Being Applied in Licensee Response to GL 95-07 ML20135D7791997-02-27027 February 1997 Notification of Significant Licensee Meeting W/Entergy Operations,Inc on 970319 in Arlington,Tx to Discuss Current Performance ML20134M2471997-02-14014 February 1997 Submits List of Plants Not Meeting Selection Criteria for Ti 2515/118 Insp on Basis of Factors Such as SWS Operating Experience,Contribution of SWS to Plant Risk Assessment, Licensee Programs in Response to GL-89-13 ML20135B6231996-11-27027 November 1996 Notification of 961217 Licensee Meeting W/Util in Arlington, Tx to Discuss Evaluation Approach & Results of UFSAR Assessments at Each Facility ML20134L6121996-11-19019 November 1996 Notification of 961121 Meeting W/Entergy Operations,Inc,In Rockville,Md to Discuss Views on Funding for Decommissioning Costs of Nuclear Power Plants as May Apply for Each of Four Nuclear Plant Sites ML20129K1821996-11-0606 November 1996 Notification of 961121 Visit to Plant to Review Component Procurement Packages Using Graded Quality Assurance That Have Been Completed by Licensee ML20134C9121996-10-0808 October 1996 Notification of 961114 Meeting W/Util in Rockville,Md to Discuss Results of Self Assessment of Accuracy of Info in FSAR for Each Plant Site ML20134B5061994-04-13013 April 1994 Submits Plants Which Will Be Discussed in Categories Indicated Re Results of Screening Meetings for June 1994. Partially Deleted ML20149D7871993-12-20020 December 1993 Provides Interim Guidance to Regions for Review of Licensee Action to Address Pressure Locking & Thermal Binding of Valves Until New Generic Communication Issued ML20058G5601993-11-30030 November 1993 Notification of 931206 Meeting W/Util in Rockville,Md to Discuss Licensee 931021 Request to Be Allowed to Use Alternatives to Requirements of 10CFR50.55a(f) & (G) ML20057B1281993-09-14014 September 1993 Forwards Page 33 of Rev 5 to GGNS Training & Qualification Plan,Transmitted Via .Page Inadvertently Omitted from Subj Transmittal.Page Withheld ML20057A4581993-09-0101 September 1993 Notification of Significant Meeting W/Util in Atlanta,Ga on 930916 to Discuss Refueling Outage Number 6 Plan & Current Plant Issues 1999-09-02
[Table view] Category:MEMORANDUMS-CORRESPONDENCE
MONTHYEARML20217M6061999-10-20020 October 1999 Notification of 991102 Meeting with Util in Port Gibson,Ms to Discuss Bases for Emergency Preparedness Plan Change Submitted in & Supplemented by 990120 & 0715 Ltrs IR 05000416/19990021999-09-10010 September 1999 Notification of Significant Licensee Meeting with Entergy Operations,Inc on 991018 to Discuss Listed Topics Identified in NRC Insp Repts 50-416/99-02,99-03 & 99-06 ML20211K7171999-09-0202 September 1999 Forwards Ineel Technical Ltr Rept, Evaluation of Fuel Pin Failure Timing in Boiling Water Reactors Dated 990730.Rept Used for Review of BWROG Rept on Revised Source Term Accident Analysis ML20211H4441999-08-27027 August 1999 Notification of Significant Meeting with Util on 990916 & 17 in Arlington,Tx to Improve Utility & NRC Understanding of Industry & Regulatory Perspectives on Current Issues ML20209G2421999-07-14014 July 1999 Notification of 990722 Meeting with License in Rockville, MD to Discuss Changes in EOI Licensing Organization Including Division of Responsibilities within New EOI Corporate Licensing Group ML20196F0391999-06-23023 June 1999 Notification of 990707 & 08 Meeting with EOI in Conference 1 at GGNS Energy Svc Ctr to Discuss Low Power Shutdown Risk Assessment Methods & Associated Probabilistic Risk Assessment Model ML20207A2551999-05-18018 May 1999 Notification of 990603 Meeting with EOI in Rockville,Md to Discuss EOI Submittal on BWROG Source Term Analysis & Possible Related Future Amend Requests from EOI ML20205R8871999-04-20020 April 1999 Notification of 990504 Meeting with Util in Rockville,Md to Discuss Proposal to Submit Consolidated Security Plan for Util Sites ML20205B8871999-03-26026 March 1999 Notification of 990415 Meeting with Utils in Knoxville,Tn to Visit Test Site & Discuss Test Program for ECCS Suppression Pool Suction Strainer.Context of Meeting Considered Entirely Proprietary ML20204B3041999-03-15015 March 1999 Notification of Licensee Meeting with Util in Energy Svc Ctr,Grand Gulf Site on 990415 to Discuss Plant Performance Review Results.Meeting Open to Public ML20195G1121998-11-17017 November 1998 Notification of 981201-02 Meeting with Entergy Operations in Taft,Louisianna to Conduct Joint Workshop for Licensing Personnel from Entergy & Nrc,Project Directorate IV-1 ML20151X1651998-09-14014 September 1998 Notification of Significant Licensee Meeting W/Util on 980929 to Discuss Emergency Preparedness Activities & Issues ML20151U7971998-09-0808 September 1998 Notifies of 980929 Meeting with Util in Rockville,Md to Discuss Level of Instructions & Details for Transferring Quality Assurance Plan Details from Current Program Plans at Four Sites to Std Quality Assurance Program Plan ML20153H6671998-09-0808 September 1998 Revised Notification of 981007 Meeting with Util to Discuss Level of Instructions & Details for Transferring QA Plan Details from Current Program Plans at Four Sites to Std Program Plan at All Sites.Originally Scheduled for 980929 ML20238F5861998-08-28028 August 1998 Notification of 980909 Meeting w/BWR/6S:EOI & Listed Utils in Rockville,Md to Discuss W/Nrc Planned Applications by Licensees to Reduce Operability Requirements During Refueling Outages ML20237A2811998-08-12012 August 1998 Notification of 980827 Meeting W/Nrc & Util in Rockville,Md to Discuss Level of Instructions & Details for Transferring QA Plan Details from Current Program Plans at Four Sites ML20249A2101998-06-11011 June 1998 Notification of 980702 Meeting W/Util in Rockville,Md to Discuss Level of Instructions & Details for Transferring Quality Assurance Plan Details from Current Program Plans at Four Sites to Std Quality Assurance Program Plan for Site ML20248M0751998-06-0909 June 1998 Notification of 980625 Meeting W/Util in Rockville,Md to Discuss Installation & Design of Suppression Pool ECCS Strainer to Meet NRC Bulletin 96-003 ML20248B4181998-05-26026 May 1998 Forwards NRC Operator Licensing Exam Rept (Including Completed & Graded Tests) for Tests Administered on 980330- 0403 IR 05000416/19983011998-05-26026 May 1998 Forwards NRC Operator Licensing Exam Rept 50-416/98-301 for Tests Administered on 980330-0403 ML20216D6351998-04-13013 April 1998 Notification of 980416 Meeting W/Util in Rockville,Md to Discuss Entergy Operations,Inc Initial Proposal to Standardize Security Plans for Listed Plants ML20217E8471998-03-26026 March 1998 Notification of Significant Licensee Meeting W/Util on 980402 to Discuss Entergy Operations,Inc Annual Performance Assessment ML20216H9441998-03-19019 March 1998 Notification of 980331 Meeting W/Util in Rockville,Md for Licensee to Brief Staff on Risk Mgt for Upcoming 9th Refueling Outage Scheduled to Begin on 980411.Licensee Will Do Presentation to Meet NRC Bulletin 96-003 ML20216J4051998-03-18018 March 1998 Forwards SER Authorizing Licensee 980211 & 0310 Ltrs, Requesting Approval of Alternative Reactor Weld Exam,Per Provisions of 10CFR50.55a(a)(3)(i) & 10CFR50.55a(g)(6)(ii) for Plant for Next 2 Operating Cycles ML20217F2521998-03-11011 March 1998 Notification of 980331 Meeting W/Util in Rockville,Md to Discuss Design of Suppression Pool Strainer to Meet NRC Bulletin 96-003.Meeting Cancelled as of 980326 ML20216C8601998-03-11011 March 1998 Notification of 980331 Meeting W/Util in Rockville,Md to Discuss Design of Suppression Pool Strainer to Meet Bulletin 96-03 ML20197B8721998-03-0505 March 1998 Notification of 980401 Meeting W/Util in Jackson,Ms to Discuss Licensing Issues & Regulatory Performance Efficiencies W/Licensing Staff for Plants.Meeting Agenda Encl ML20203B4131998-02-0505 February 1998 Notification of 980319 Meeting W/Entergy Operations,Inc,In Rockville,Md to Discuss Level of Instructions & Details of Transferring QA Plan Details from Current Program Plans at Four Sites to Standard QA Program Plan for Use at All Sites ML20198M8351998-01-12012 January 1998 Notification of 980122 Meeting W/Util in Rockville,Md to Discuss Site Licensing Status for Listed Plants & to Explore Ways to Standardize Licensing Submittals & Issuances ML20198M7531998-01-12012 January 1998 Notification of Meeting W/Entergy Operations,Inc,On 980123 in Rockville,Md to Discuss Plans to Change Radiological Emergency Response Plan ML20198K0791997-10-15015 October 1997 Notification of 971022 Meeting W/Entergy Operations,Inc in Rockville,Md Re Standard Quality Assurance Manual for Entergy Sites ML20217D0461997-09-29029 September 1997 Notification of Significant Licensee Meeting W/Util on 971029 to Discuss Systematic Assessment of Licensee Performance ML20141E8501997-06-27027 June 1997 Notifies of 970710 Meeting W/Licensee in Rockville,Md Re Appeal of Decision by Nrc,In ,That Changes in Rev 28.001-95 of Plant Emergency Plan Not within 10CFR50.54(q) & Can Not Be Implemented W/O Prior NRC Approval ML20137W6841997-04-15015 April 1997 Notification of 970502 Meeting W/Listed Attendees in Jackson,Mi.Meeting Agenda Encl ML20137F2351997-03-24024 March 1997 Summary of 970207 Meeting W/Listed Attendees in Rockville,Md to Discuss Nuclear Energy Inst Concerns Re Graded Quality Assurance Activities W/Volunteer Plants ML20137C9201997-03-20020 March 1997 Forwards Documentation of Meeting Conducted in Region 4 Office on 970225 to Discuss NRC Enforcement Policy as Applied to Nonescalated Enforcement ML20135F8581997-03-13013 March 1997 Notification of 970424 Licensee Meeting W/Util in Arlington, Tx to Discuss Current Performance ML20135F0921997-03-0606 March 1997 Notification of Significant Licensee Meeting W/Util on 970319 to Discuss Current Performance.Meeting Cancelled ML20135D8531997-03-0303 March 1997 Notification of 970325 Meeting W/Util in Port Gibson,Ms to Discuss MOV Thurst Methodology Developed by Util.Subj Methodology Being Applied in Licensee Response to GL 95-07 ML20135D7791997-02-27027 February 1997 Notification of Significant Licensee Meeting W/Entergy Operations,Inc on 970319 in Arlington,Tx to Discuss Current Performance ML20134M2471997-02-14014 February 1997 Submits List of Plants Not Meeting Selection Criteria for Ti 2515/118 Insp on Basis of Factors Such as SWS Operating Experience,Contribution of SWS to Plant Risk Assessment, Licensee Programs in Response to GL-89-13 ML20135B6231996-11-27027 November 1996 Notification of 961217 Licensee Meeting W/Util in Arlington, Tx to Discuss Evaluation Approach & Results of UFSAR Assessments at Each Facility ML20134L6121996-11-19019 November 1996 Notification of 961121 Meeting W/Entergy Operations,Inc,In Rockville,Md to Discuss Views on Funding for Decommissioning Costs of Nuclear Power Plants as May Apply for Each of Four Nuclear Plant Sites ML20129K1821996-11-0606 November 1996 Notification of 961121 Visit to Plant to Review Component Procurement Packages Using Graded Quality Assurance That Have Been Completed by Licensee ML20134C9121996-10-0808 October 1996 Notification of 961114 Meeting W/Util in Rockville,Md to Discuss Results of Self Assessment of Accuracy of Info in FSAR for Each Plant Site ML20134B5061994-04-13013 April 1994 Submits Plants Which Will Be Discussed in Categories Indicated Re Results of Screening Meetings for June 1994. Partially Deleted ML20149D7871993-12-20020 December 1993 Provides Interim Guidance to Regions for Review of Licensee Action to Address Pressure Locking & Thermal Binding of Valves Until New Generic Communication Issued ML20058G5601993-11-30030 November 1993 Notification of 931206 Meeting W/Util in Rockville,Md to Discuss Licensee 931021 Request to Be Allowed to Use Alternatives to Requirements of 10CFR50.55a(f) & (G) ML20057B1281993-09-14014 September 1993 Forwards Page 33 of Rev 5 to GGNS Training & Qualification Plan,Transmitted Via .Page Inadvertently Omitted from Subj Transmittal.Page Withheld ML20057A4581993-09-0101 September 1993 Notification of Significant Meeting W/Util in Atlanta,Ga on 930916 to Discuss Refueling Outage Number 6 Plan & Current Plant Issues 1999-09-02
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,' UNITED STATES
. Nc LEAR REGULATORY COMMISSION 1 6
- W ASHINGToN. D. C. 2 MSS JUN 13 W3 '
. Docket Nos. 50-416/417 l
R. C. DeYo cts, Assistant Director for Light Water Reactors, Group 1, RL I GRAND GULF 1, & 2 - EVALUATION OF POOL DYNAMIC LOADS (TAR-1579) 1 Plant Name: Grand Gulf 1 & 2 l Docket Nos.:t 50-416/417 Licensing Stage: Post-CP Project Managir: E. Butcher Requested Completion Date: June 9,1975 Technical Review By: Contain=ent Systems Branch Description of Task: Evaluate Submittal by MP&L Review Status: Awaiting Additional Information on Pool Dynamic Loads In response to y.our Technical Assistance Request of April 29, 1975 the ,
Containment Systems Branch has reviewed the applicant's submittal of !
April 25, 1975 regarding pool dynamic loads for the Grand Gulf plant. ,
We have also cet vith the applicant, Bechtel, and General Electric on l June 3 and 4,1975 to further discuss this area of concern. Based on our review we have established the following preliminary positions: '
, 1. There is insufficient pool dynamic loading data available
. to justify the design of the main steam line pipe-tunnel at its current location. We therefore recommend that the i pipe tunnel be relocated such that the bottom of the tunnel 1 base slab is ac an elevation of about 20 feet above the pool.
The pool swell impact load specified for the HCU floor (15 psi) will also be a:ceptabic for the tunnel base slab at tLis elevation. j l
- 2. The TIP station, equipment hatch, and personnel hatch, which l are located below 20 feet, should be modified so that they do not experience impact loads. We recocmend that s tructures which are partially immersed in the suppression pool be designed for coincident air bubble and drag loads.
- 3. Structures like gratings may be designed for drag loads per GE recommendation.
- 4. Additional one-third scale pool dynamic tests should be performed
. by GE to confirm pool motion characteristics. The nature of these l tests were discussed virh GE and the applicant on June 4,1975, l and included both air and steam blowdowns. The specifics of these tests are being discussed with GE as well as the test l
schedule to be consistent with current licensing schedules. '
Until such data becomes available we have established a load gC#%g profile that we would find acceptable for small structures. This O e v ( M E M/ca98 a
8806160421 880606 PDR FOIA CONNOR88-91 PDR t
e -
i 4 ' JUN 1 3 575 '
R. C. DeYoung o' ,
v#
information was given to the applicant.and CE.
- 5. As indicated in our letter to the General Electric Company (GE) l cn June 12,19"/S (R. Tedesco to I. Stuart) we find that the relief valve vent clearing loads as proposed by GE are acceptable at this tirs baseri on our review of GE's model. However, to provide additional confirmation of these loads we will also require -in-plant testing of relief valves during startup testing.
Procotype testing of each class of plants and relief valve configurativo is acceptable. As further indicated in our letter, should a stean quencher design currently being tested at Moss Landing substantially reduc.*s relief valve vent clearing loads, we believe that the modified discharge system should be incorporated into the.Fbrk III containment to provide additional cargin in the containment design. .
We will also need the enclosed additional information to complete our -
review.
NMCO
' ' - ~ ~"
Robert L. Tedesco, Assistant Director ~ '
for Containmenf Safett Division of Technical
Enclosure:
Request.for Additional Information cc: S. Hanauer F. Schroedar D. Eisenhut E. Butcher W. Butler G. Lainas . .
J. Kudrick i
J. Shapaker J. Glynn E. Jacobs
- R. Cudlin I A. Giambusso (w/o encl.) !
W. Mcdonald (w/o encl.) )
e og . >= -o - >
- ._ g
. REQUEST FOR ADDITIONAL INFOR)U '02
[ ND CULF _ NUCLEAR STATION, UNITS e &2 DOCKET NOS. 50-416/417 i
s s/
- 1. In a meeting on June 4,1975 in Bethesda with the NRC, Bechtel, and General Electric, Mississippi Powet & Light (MP&L) proposed a nu=ber of containment design modifications in response to staff concerns related to pool dynamic loads. These were related to the TIP station
, floor, the personnel hatch, the equipment hatch, and the main steam pipe tunnel. Provide appropriate documentation of these modifications including revised draw.8ngs and pool dynamic load specifications for each of the affected structures.
- 2. Provide clarification and juatification of your pool dynamic load specifications for pipes I-beces, gratings, and other small structures
, as a functior. of elevation above the suppression pool surface. We understand that additional tests and available data will be included in your programs. Appropriate data should be provided as soon as available.
- 3. In a nunber of instances, your submictal o$ April 25, 1975 provides generalized methodologies and guidelinca for specifying pool dynamic loads (e.g., pgs. 6-3, 6-4, 4-3, 8-J mid Figures 6. 6, 10. 3, 10. 4 and 10.5). The extent to which this is applicable to the Grand Gulf Nuclear Station should be clarified by supplementing the general information with a description of the particular structures which are affected, their pertinent design parameters, and the resulting pool dynamic loads. ',
e 4
i .
' ~2-v 4. Item #6 of our March 3,1975 letter requested that you provide an ,
evaluation of the type and magnitude of possible asymmetric contain-ment loads. Your nubmittal of April 25, 1975 does not provide an adequate response to this concern. Therefore, provide the requested 4
information including, for example, consideration of seismically induced i
pool motion which could lead to locally variable vent submergences, ,
the worst (with respect to asymmetric loading) combination of coincident relief valve actuation, random vent chugging, and variable (circumferentially) bubble pressure's.
- 5. Item #9 of our March 3,1975 letter requested that you describe your program for responding to the concerns of the ACRS as outlined in the
- question. Your response indicated that no specific investigation of pressure oscillations due to either high steam mass flux condensation or vent chugging was planned. The NRC believes that the development of analy'tical models to evaluate this phenomena is required to meet the concern of the ACRS.
- 6. The load determination for RV's either in single or multiple valve ,
operation is determin'ed analytically. The method for determining the pressure amplitude at a specific location on the suppression pool vall due to multiple valve openingt is given in Figure A.2. The procedure 4
accounts for a pressure contribution from each ramshead vent exit of the simultaneously actuating RV's. Since the procedure for calcu-lating the loads is based on a phenomenological approach of vent clearing, bubble pressure, etc. , e.xplain why in Figure A.2 there in not assurad to be a bubble at each side of the ramshead?
.,3, l ,4 .
t
- 7. ' o loads on submerged components (i.e. , RHR return lines, suction strainers, etc.) due to RV actuation are given (i.e. , RHR return lines, suction strainers, etc.). Explain the method used for determining such loads on the various components and the magnitude of these loads.
- 8. In Figure A.2, the hold-down loads on the ramshead vent exits are schematically shown in the three orthagonal directions. The only value given for this load is 160 KIP along the vent axis. Explain the method used to determine this load. Explain further what force magnitude was assigned toyF to account for unequal clearing of the two sides of the ramshead.
- 9. The loading on the pool perimeter for several RV opening modes are presented in Figure A.7. The dynamic behavior of, the load for each valve opening is shown in Figure A.10. For a complete specification of this loading and its severity on the drywell and containment s t ru cture , including pool components, the design capability for the number of load cycles over the life of the plant should be presented.
Also, provide a tabulation of the anticipated number of valve opening events during the life of the plant and indicate how such operating aspects are included in the plant design.
4 e
t 1