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| | number = ML17252A046 | | | number = ML17252A046 |
| | issue date = 07/20/1976 | | | issue date = 07/20/1976 |
| | title = Dresden, Unit 3, Diesel Generator Cooling Water Flood Protection | | | title = Diesel Generator Cooling Water Flood Protection |
| | author name = Silver R D | | | author name = Silver R D |
| | author affiliation = NRC/NRR | | | author affiliation = NRC/NRR |
Revision as of 23:25, 27 January 2019
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Category:Letter
MONTHYEARIR 05000237/20230042024-02-0202 February 2024 Integrated Inspection Report 05000237/2023004 and 05000249/2023004 IR 05000010/20230012024-01-17017 January 2024 NRC Inspection Report 05000010/2023001 (Drss) ML23354A2812024-01-0404 January 2024 Exemption from Select Requirements of 10 CFR Part 73 (EPID L-2023-LLE-0031 (Security Notifications, Reports, and Recordkeeping and Suspicious Activity Reporting)) ML23305A1402023-12-13013 December 2023 Units 1 & 2; Nine Mile Point, Unit 2; Peach Bottom, Units 2 & 3; and Quad Cities, Units 1 and 2 - Issuance of Amendments to Adopt Traveler TSTF-580 RS-23-121, Sixth Ten-Year Interval Inservice Testing Program2023-11-30030 November 2023 Sixth Ten-Year Interval Inservice Testing Program SVPLTR 23-0037, Core Operating Limits Report for Cycle 292023-11-29029 November 2023 Core Operating Limits Report for Cycle 29 RS-23-119, Supplemental Information Letter for Part 73 Exemption Request - Responses to Request for Confirmatory Information2023-11-10010 November 2023 Supplemental Information Letter for Part 73 Exemption Request - Responses to Request for Confirmatory Information ML23317A1192023-11-10010 November 2023 Constellation Energy Generation, LLC - 2023 Annual Report - Guarantees of Payment of Deferred Premiums RS-23-107, Relief Request I5R-22, Inservice Inspection Program Relief Request Regarding Examination Coverage for the Fifth Inservice Inspection Interval2023-11-0808 November 2023 Relief Request I5R-22, Inservice Inspection Program Relief Request Regarding Examination Coverage for the Fifth Inservice Inspection Interval RS-23-102, Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation2023-10-16016 October 2023 Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation ML23285A2342023-10-13013 October 2023 Confirmation of Initial License Examination RS-23-097, Constellation Energy Generation, LLC, Advisement of Leadership Changes and Submittal of Updated Standard Practice Procedures Plans2023-10-12012 October 2023 Constellation Energy Generation, LLC, Advisement of Leadership Changes and Submittal of Updated Standard Practice Procedures Plans ML23279A0712023-10-0606 October 2023 Response to NRC Dresden Nuclear Power Station, Units 2 and 3 - Comprehensive Engineering Team Inspection Report 05000237/2023011 and 05000249/2023011 ML23269A0662023-09-28028 September 2023 Proposed Alternative Request RV-23H Associated with the Sixth 10-Year Inservice Testing Interval ML23265A1322023-09-27027 September 2023 Proposed Alternative Request RV-03 Associated with the Sixth 10-Year Inservice Testing Interval ML23205A1362023-09-20020 September 2023 Proposed Alternative Request RV-02D Associated with the Sixth IST Interval IR 05000237/20230112023-09-0606 September 2023 Comprehensive Engineering Team Inspection Report 05000237/2023011 and 05000249/2023011 RS-23-071, Application to Adopt TSTF-564, Safety Limit MCPR2023-08-30030 August 2023 Application to Adopt TSTF-564, Safety Limit MCPR RS-23-080, Constellation Energy Generation, LLC, Application to Revise Technical Specifications to Adopt TSTF-264-A, Revision 0, 3.3.9 and 3.3.10 - Delete Flux Monitors Specific Overlap Requirement SRs2023-08-30030 August 2023 Constellation Energy Generation, LLC, Application to Revise Technical Specifications to Adopt TSTF-264-A, Revision 0, 3.3.9 and 3.3.10 - Delete Flux Monitors Specific Overlap Requirement SRs IR 05000237/20234022023-08-29029 August 2023 Security Baseline Inspection Report 05000237/2023402 and 05000249/2023402 IR 05000237/20230022023-08-0808 August 2023 Integrated Inspection Report 05000237/2023002 and 05000249/2023002 ML23212A9892023-08-0303 August 2023 Subsequent License Renewal Application Public Meeting Summary of Pre-Submittal Meeting ML23174A1502023-08-0303 August 2023 Issuance of Amendment Nos. 282 and 275 Control Rod Scram Times ML23193A0052023-07-28028 July 2023 Subsequent License Renewal Application Public Meeting Summary of Pre-Submittal Meeting ML23192A6292023-07-11011 July 2023 Correction Letter - Issuance of Amendment Nos. 281 and 274 Regarding Transition to GNF3 Fuel (EPID L-2022-LLA-0121) (Non-Proprietary) ML23144A3142023-07-0606 July 2023 Issuance of Amendment Nos. 281 and 274 Transition to GNF3 Fuel (EPID L-2022-LLA-0121) - Nonproprietary ML23187A0462023-07-0606 July 2023 Notification of NRC Baseline Inspection and Request for Information; Inspection Report 05000237/2023004 ML23178A2422023-06-28028 June 2023 Reassignment of the U.S. Nuclear Regulatory Commission Branch Chief in the Division of Operating Reactor Licensing for Plant Licensing Branch III SVPLTR 23-0021, Registration of Use of Casks to Store Spent Fuel2023-06-20020 June 2023 Registration of Use of Casks to Store Spent Fuel RS-23-078, Supplement to License Amendment Request to Revise Technical Specification 3.1.4, Control Rod Scram Times2023-06-16016 June 2023 Supplement to License Amendment Request to Revise Technical Specification 3.1.4, Control Rod Scram Times RS-23-077, Response to NRC Regulatory Issue Summary 2023-01, Preparation and Scheduling of Operator Licensing Examinations2023-06-16016 June 2023 Response to NRC Regulatory Issue Summary 2023-01, Preparation and Scheduling of Operator Licensing Examinations IR 05000237/20233012023-05-30030 May 2023 NRC Initial License Examination Report 05000237/2023301; 05000249/2023301 RS-23-042, Application to Revise Technical Specifications to Adopt TSTF-580, Provide Exception from Entering Mode 4 with No Operable RHR Shutdown Cooling2023-05-25025 May 2023 Application to Revise Technical Specifications to Adopt TSTF-580, Provide Exception from Entering Mode 4 with No Operable RHR Shutdown Cooling ML23132A0932023-05-17017 May 2023 Information Meeting (Public Open House) with a Question and Answer Session to Discuss NRC 2022 End-Of-Cycle Plant Performance Assessment of Dresden Power Station, Units 2 and 3 RS-23-070, Supplement to License Amendment Request Regarding Transition to GNF3 Fuel2023-05-16016 May 2023 Supplement to License Amendment Request Regarding Transition to GNF3 Fuel SVPLTR 23-0018, Submittal of 2022 Annual Radiological Environmental Operating Report2023-05-15015 May 2023 Submittal of 2022 Annual Radiological Environmental Operating Report IR 05000237/20230012023-05-0404 May 2023 Integrated Inspection Report 05000237/2023001 and 05000249/2023001 SVPLTR 23-0019, ILT 22-1 (2023-301) Svpltr 23-0019 Post-Exam Submittal Letter (1)2023-05-0101 May 2023 ILT 22-1 (2023-301) Svpltr 23-0019 Post-Exam Submittal Letter (1) ML23118A3472023-05-0101 May 2023 County, 1 & 2; Nine Mile Point, 2; and Quad Cities, 1 & 2 - Correction of Amendment No. 193 Adoption of TSTF-306, Revision 2, Add Action to LCO 3.3.6.1 to Give Option to Isolate the Penetration EPID L-2022-LLA-0143 ML23114A2522023-04-28028 April 2023 Request to Use a Provision of a Later Edition of the ASME Boiler & Pressure Vessel Code, Section XI IR 05000237/20234012023-04-26026 April 2023 Cyber Security Inspection Report 05000237/2023401 and 05000249/2023401 ML23081A0382023-04-25025 April 2023 County, 1 & 2; Nine Mile Point, 2; and Quad Cities, 1 & 2 - Issuance of Amendments to Adopt TSTF-306, Rev. 2, Add Action to LCO 3.3.6.1 to Give Option to Isolate the Penetration IR 05000237/20235012023-04-21021 April 2023 Emergency Preparedness Biennial Exercise Inspection Report 05000237/2023501 and 05000249/2023501 ML23110A3202023-04-21021 April 2023 Information Request to Support the NRC Annual Baseline Emergency Action Level and Emergency Plan Changes Inspection RS-23-057, Supplement to License Amendment Request Regarding Transition to GNF3 Fuel2023-04-17017 April 2023 Supplement to License Amendment Request Regarding Transition to GNF3 Fuel SVPLTR 23-0014, Annual Dose Report for 20222023-04-15015 April 2023 Annual Dose Report for 2022 ML23088A2242023-04-0505 April 2023 Regulatory Audit Report Regarding License Amendment Request to Transition to GNF3 Fuel ML23087A0482023-03-28028 March 2023 Operator Licensing Examination Approval - Dresden Nuclear Power Station, April 2023 2024-02-02
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' ,,_ "' ' *t!!.' . .J.* ,*" Li UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 July 20, 19 76 Docket No. 50-249 Karl R. Goller, Assistant Director for Operating Reactors, DOR f;/!...y THRU: Dennis L. Ziemann, Chief, Operating Reactors Branch #2, DOR . DRESDEN UNIT 3 -DIESEL GENERATOR COOLING WATER FLOOD PROTECTION Introduction By letter of July 16, 1976, Commonwealth Edison Company (CE) informed us that the Dresden Unit 3 submersible diesel generator cooling water pwnp had failed and could not be repaired or replaced within the seven day period allowed for continued operation with one diesel generator out of service (Specification 3.9.B.2.).
The seven day period ends Tuesday, July 20, at 5:30 pm. The replacement pump, ordered about a year ago., as a spare, is not expected to be available until about August 30. CE stated that the cooling pwnp would be replaced temporarily, with the nonsubmersible pwnp which had been originally used. The original pump had been replaced by the submersible pump as part of a flood protection modification to assure co"oling of the Unit 3 diesel would be available if flooding of the cribhouse occurred.
CE has formed a review in accordance with the requirements of 10 CFR 50.59 and has concluded that the temporary replacement does not involve a change in technical or an unreviewed safety question.
Discussion Prior to* replacement of the original Dresden 3 .and Dresden 2/3 diesel generator cooling water pumps with submersible pumps, the possibility existe.d that a flood in the cribhouse could fail these pumps and* therefore, fail the diesel generators.
As an interim fix, reported to the NRC by CE letter of August 23, 1973, CE committed to shutting down the reactor in the event of flooding in the cribhouse and connecting a manual hose type intertie from the fire water system to the cooling
- water supply of the 2/3 diesel generator.
The temporary arrangement now planned by CE would be better than the interim fix previously reviewed
.-.*--***" .. :, . . -_. *. , .. "_. ..
..,,,;; ...
- j -. .. .:., .-*;. . . . ... _ ' *, 'Karl GoUer: .. _(' . . ..;_ -2 *.-. . July 20; t976 ..
- l * ** *.-*-i' .:.. _.' . '. _ ... *.*. . ' in. that** an opetab1.e
- subnie:rsible pump'*will":be avf.l.ilable to supply cooling . water to the 2/3 diesel.
- in. :addition, the Unit 2 *diesel which is cooied 'by a submersible pump" could be crossti,ed
- 'to the Unit 3 emergency .busses. _CE has also ccinllitltted . to*
Uiii t. 3 ff. crib4ou5e flooding occurred the new*
A level -alarm wo:uld-warn
.. of flooding before wate:f level' reached *tne 'pump° eievation. , * -* ' *
- I* * ' * * * ' * -* -' _:. "ilased,*, on ab.ave conslder_atioj'is, I *hav$
that th6 meas.ures, -planne.d by CE are acceptable as an* interim actfo.n ,prior to installation
- of a repaired or.replacement'sul>mersibie pWnp; that the actions
-*by CE are not in *conflic.t with the. tecllnical specifications and .that
'measures wfll_ be sUbstantiaHy better than the measures previou5ly reviewed_
I *conclude that* operation wiU1i/,*.
the on :a 'teiirp,*orary-basis does not .involve .. an _unrevfewed safety *question
T. Carter DISTRIBUTION*
NRC PDR . Local*PDR R_DSilver RMDiggs , . . :: .1_.. -::. _:** c,,. ' !_ ... __ . *. :_.<OrY*bi ntJ St
\0_ Richard D. Silver
- Operating Reactors Branch-.#2 Divisio:n of Operating Reactors ; *.' .*. ;_ .. : . .. ' . .-. * .. . '.. l *. ,*..,, . ' #2 __ .. -.DM13_ #2.. ..: _ -.................... . RJ:?S.il ver: ah . DLZi emann
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.......................... . -. ' . -Form (Rev. 9-53) AE<;:M .02'0. ' -* U.* S:
PRINTING 0PP1CEI .