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Category:Letter type:ULNRC
MONTHYEARULNRC-06892, Independent Spent Fuel Storage Installation Registration of Dry Spent Fuel Storage Canister HGMPC00062024-06-26026 June 2024 Independent Spent Fuel Storage Installation Registration of Dry Spent Fuel Storage Canister HGMPC0006 ULNRC-06891, Independent Spent Fuel Storage Installation, Registration of Dry Spent Fuel Storage Canister HGMPC00052024-06-26026 June 2024 Independent Spent Fuel Storage Installation, Registration of Dry Spent Fuel Storage Canister HGMPC0005 ULNRC-06886, Independent Spent Fuel Storage Installation, Registration of Dry Spent Fuel Storage Canister HGMPC00042024-06-12012 June 2024 Independent Spent Fuel Storage Installation, Registration of Dry Spent Fuel Storage Canister HGMPC0004 ULNRC-06885, Independent Spent Fuel Storage Installation, Registration of Dry Spent Fuel Storage Canister HGMPC00032024-06-12012 June 2024 Independent Spent Fuel Storage Installation, Registration of Dry Spent Fuel Storage Canister HGMPC0003 ULNRC-06884, Independent Spent Fuel Storage Installation, Registration of Dry Spent Fuel Storage Canister HGMPC00022024-06-12012 June 2024 Independent Spent Fuel Storage Installation, Registration of Dry Spent Fuel Storage Canister HGMPC0002 ULNRC-06882, Independent Spent Fuel Storage Installation Registration of Dry Spent Fuel Storage Canister HGMPC00122024-05-16016 May 2024 Independent Spent Fuel Storage Installation Registration of Dry Spent Fuel Storage Canister HGMPC0012 ULNRC-06877, Final Safety Analysis Report Revision OL-27 and Technical Specification Bases Revision 252024-05-0606 May 2024 Final Safety Analysis Report Revision OL-27 and Technical Specification Bases Revision 25 ULNRC-06856, CFR 50.59 and 10 CFR 72.48 Summary Report2024-05-0101 May 2024 CFR 50.59 and 10 CFR 72.48 Summary Report ULNRC-06869, Submittal of Callaway, Unit 1, 2023 Annual Radiological Environmental Operating Report2024-04-30030 April 2024 Submittal of Callaway, Unit 1, 2023 Annual Radiological Environmental Operating Report ULNRC-06876, Registration of Dry Spent Fuel Storage Canister HGMPC00102024-04-25025 April 2024 Registration of Dry Spent Fuel Storage Canister HGMPC0010 ULNRC-06872, Independent Spent Fuel Storage Installation, Registration of Dry Spent Fuel Storage Canister HGMPC00082024-04-17017 April 2024 Independent Spent Fuel Storage Installation, Registration of Dry Spent Fuel Storage Canister HGMPC0008 ULNRC-06871, Independent Spent Fuel Storage Installation, Registration of Dry Spent Fuel Storage Canister HGMPC00072024-04-17017 April 2024 Independent Spent Fuel Storage Installation, Registration of Dry Spent Fuel Storage Canister HGMPC0007 ULNRC-06866, Submittal of Cycle 26 Commitment Change Summary Report2024-04-17017 April 2024 Submittal of Cycle 26 Commitment Change Summary Report ULNRC-06863, Submittal of Annual Exposure Report for 20232024-03-20020 March 2024 Submittal of Annual Exposure Report for 2023 ULNRC-06852, Owners Activity Reports (OAR-1 Forms) for Cycle/Refuel 262024-03-0505 March 2024 Owners Activity Reports (OAR-1 Forms) for Cycle/Refuel 26 ULNRC-06858, Completion of License Renewal Activities Prior to Entering the Period of Extended Operation2024-02-21021 February 2024 Completion of License Renewal Activities Prior to Entering the Period of Extended Operation ULNRC-06853, Submittal of 2023 Fitness for Duty Performance Data Per Per 10 CFR 26.7172024-01-29029 January 2024 Submittal of 2023 Fitness for Duty Performance Data Per Per 10 CFR 26.717 ULNRC-06847, Supplement to Relief Request from Requirements of ASME BPV Code, Section XI, Subsection Iwl Regarding Examination and Testing of the Unbonded Post-Tensioning System (Relief Request C3R-01)2023-12-21021 December 2023 Supplement to Relief Request from Requirements of ASME BPV Code, Section XI, Subsection Iwl Regarding Examination and Testing of the Unbonded Post-Tensioning System (Relief Request C3R-01) ULNRC-06849, License Renewal Resolution for Commitments 34 and 35 Perform Evaluation of Crack Initiation and Propagation in Steam Generator Divider Plate and Tube-To-Tubesheet Welds2023-12-20020 December 2023 License Renewal Resolution for Commitments 34 and 35 Perform Evaluation of Crack Initiation and Propagation in Steam Generator Divider Plate and Tube-To-Tubesheet Welds ULNRC-06844, Request for Exemption from Specific Requirements in 2023 Security Rule, Enhanced Weapons, Firearms Background Checks, and Security Event Notification2023-12-0707 December 2023 Request for Exemption from Specific Requirements in 2023 Security Rule, Enhanced Weapons, Firearms Background Checks, and Security Event Notification ULNRC-06827, Supplement to License Amendment Request Regarding Support System Requirements for Residual Heat Removal and Control Room Air Conditioning Systems Under Technical Specifications 3.4.8, 3.7.11, and 3.9.6 (LDCN 22-0029)2023-11-20020 November 2023 Supplement to License Amendment Request Regarding Support System Requirements for Residual Heat Removal and Control Room Air Conditioning Systems Under Technical Specifications 3.4.8, 3.7.11, and 3.9.6 (LDCN 22-0029) ULNRC-06824, Response to Request for Additional Information Regarding Operating Quality Assurance Manual (Oqam) Revision 36A2023-08-17017 August 2023 Response to Request for Additional Information Regarding Operating Quality Assurance Manual (Oqam) Revision 36A ULNRC-06830, Transmittal of Updated Technical Specification Markup and Clean Pages for License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak2023-08-15015 August 2023 Transmittal of Updated Technical Specification Markup and Clean Pages for License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak ULNRC-06223, Minor Correction to License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate Test Frequencies (LDCN 2020-0004)2023-07-25025 July 2023 Minor Correction to License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate Test Frequencies (LDCN 2020-0004) ULNRC-06799, Submittal of Licensee Event Report 2022-003-01, Class 1E Electrical Air Conditioning System Thermal Expansion Valve Failure Resulted in Condition Prohibited by Technical Specifications2023-07-13013 July 2023 Submittal of Licensee Event Report 2022-003-01, Class 1E Electrical Air Conditioning System Thermal Expansion Valve Failure Resulted in Condition Prohibited by Technical Specifications ULNRC-06821, Post-Audit Follow-Up Information in Support of Callaway'S License Amendment Request and Proposed Exemption to Allow Use of Framatome Gaia Fuel (LDCN 22-0002) (EPID L-2022-LLA-0150 and EPID L-2022-LLE-00301)2023-06-21021 June 2023 Post-Audit Follow-Up Information in Support of Callaway'S License Amendment Request and Proposed Exemption to Allow Use of Framatome Gaia Fuel (LDCN 22-0002) (EPID L-2022-LLA-0150 and EPID L-2022-LLE-00301) ULNRC-06822, Additional Information Regarding Request for NRC Approval of Operating Quality Assurance Manual (Oqam) Revision 36a2023-06-14014 June 2023 Additional Information Regarding Request for NRC Approval of Operating Quality Assurance Manual (Oqam) Revision 36a ULNRC-06815, Request for NRC Approval of Operating Quality Assurance Manual, Revision 36a2023-06-0505 June 2023 Request for NRC Approval of Operating Quality Assurance Manual, Revision 36a ULNRC-06818, Response to Request for Additional Information Regarding License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate .2023-06-0505 June 2023 Response to Request for Additional Information Regarding License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate . ULNRC-06816, Withdrawal of Previously Submitted Enclosures Regarding License Amendment Request for Adoption of Alternative Source Term and Revision of Technical Specifications (LDCN 21-0015)2023-05-0909 May 2023 Withdrawal of Previously Submitted Enclosures Regarding License Amendment Request for Adoption of Alternative Source Term and Revision of Technical Specifications (LDCN 21-0015) ULNRC-06812, Submittal of 2022 Annual Radiological Environmental Operating Report2023-04-27027 April 2023 Submittal of 2022 Annual Radiological Environmental Operating Report ULNRC-06806, Submittal of Radiological Emergency Response Plan, Revision 552023-04-12012 April 2023 Submittal of Radiological Emergency Response Plan, Revision 55 ULNRC-06807, Submittal of Single Positive Test Forms2023-04-0303 April 2023 Submittal of Single Positive Test Forms ULNRC-06798, Submittal of Status of Plant Decommissioning Funding and ISFSI Decommissioning Funding Plan2023-03-30030 March 2023 Submittal of Status of Plant Decommissioning Funding and ISFSI Decommissioning Funding Plan ULNRC-06801, CFR 50.46 Annual Report Regarding ECCS Evaluation Model Revisions2023-03-30030 March 2023 CFR 50.46 Annual Report Regarding ECCS Evaluation Model Revisions ULNRC-06804, Submittal of Nuclear Property Insurance Reporting2023-03-29029 March 2023 Submittal of Nuclear Property Insurance Reporting ULNRC-06751, Application to Revise Technical Specifications to Adopt TSTF-501-A, Rev. 1, Relocate Stored Oil & Lube Oil Volume Values to Licensee Control2023-03-29029 March 2023 Application to Revise Technical Specifications to Adopt TSTF-501-A, Rev. 1, Relocate Stored Oil & Lube Oil Volume Values to Licensee Control ULNRC-06803, Submittal of Response to Request for Additional Information Regarding Results of Steam Generator Tube In-Service Inspection2023-03-29029 March 2023 Submittal of Response to Request for Additional Information Regarding Results of Steam Generator Tube In-Service Inspection ULNRC-06805, Transmittal of Special Report 2023-02 Non-Functionality of Containment Hydrogen Analyzer Channel for Greater than 30 Days2023-03-21021 March 2023 Transmittal of Special Report 2023-02 Non-Functionality of Containment Hydrogen Analyzer Channel for Greater than 30 Days ULNRC-06802, Special Report 2023-01 (PAM Report); Non-Functionality of a Post-Accident Monitoring Instrument2023-03-0909 March 2023 Special Report 2023-01 (PAM Report); Non-Functionality of a Post-Accident Monitoring Instrument ULNRC-06794, Submittal of Fitness for Duty Program Data for 20222023-01-24024 January 2023 Submittal of Fitness for Duty Program Data for 2022 ULNRC-06795, Submittal of Fitness for Duty Reports for 2022, Including Single Positive Test Forms2023-01-24024 January 2023 Submittal of Fitness for Duty Reports for 2022, Including Single Positive Test Forms ULNRC-06787, Response to Request for Additional Information Regarding License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications (LDCN 21-0015)2022-12-0808 December 2022 Response to Request for Additional Information Regarding License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications (LDCN 21-0015) ULNRC-06781, License Amendment Request to Clarify Support System Requirements for the Residual Heat Removal System and Control Room Air Conditioning System Under Technical Specifications 3.4.8, 3.7.11, and 3.9.6 (LDCN 22-0029)2022-12-0101 December 2022 License Amendment Request to Clarify Support System Requirements for the Residual Heat Removal System and Control Room Air Conditioning System Under Technical Specifications 3.4.8, 3.7.11, and 3.9.6 (LDCN 22-0029) ULNRC-06780, Additional Supplement to License Amendment Request to Adopt TSTF-439 and TSTF-505, LDCN 20-0072022-11-30030 November 2022 Additional Supplement to License Amendment Request to Adopt TSTF-439 and TSTF-505, LDCN 20-007 ULNRC-06772, 10 CFR 50.59 and 10 CFR 72.48 Summary Report2022-11-23023 November 2022 10 CFR 50.59 and 10 CFR 72.48 Summary Report ULNRC-06777, Operating Quality Assurance Manual (Oqam) Revision 362022-11-16016 November 2022 Operating Quality Assurance Manual (Oqam) Revision 36 ULNRC-06779, ULNRC-06779: Contesting of Green NCV 05000483/2022010-03, Failure to Perform Required Inservice Testing of Residual Heat Removal Heat Exchanger Pneumatically (Air) Operated Outlet and Bypass Valves2022-11-14014 November 2022 ULNRC-06779: Contesting of Green NCV 05000483/2022010-03, Failure to Perform Required Inservice Testing of Residual Heat Removal Heat Exchanger Pneumatically (Air) Operated Outlet and Bypass Valves ULNRC-06765, License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate Testing Frequencies (LDCN 2020-0004)2022-11-0303 November 2022 License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate Testing Frequencies (LDCN 2020-0004) ULNRC-06773, Results of Steam Generator Tube In-Service Inspection2022-11-0101 November 2022 Results of Steam Generator Tube In-Service Inspection 2024-06-26
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WAmeren Callaway Plant MISSOURI June 11, 2013 ULNRC-05995 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 10 CFR 50.90 Ladies and Gentlemen:
DOCKET NUMBER 50-483 CALLAWAY PLANT UNION ELECTRIC CO.
APPLICATION FOR AMENDMENT TO FACILITY OPERATING LICENSE NPF-30 (TAC NO. MF0378, LDCN 12-0015)
REVISION TO TECHNICAL SPECIFICATION 3.7.9
References:
- 1. ULNRC-05867 dated December 13, 2012, Revision to Technical Specification 3.7.9 (LDCN 12-0015)
- 2. NRC Request for Additional Information, Carl F. Lyon (NRC) to Adam C. Heflin (Union Electric Company),
dated May 13, 2013 In Reference 1 above, Ameren Missouri (Union Electric Company) submitted an application for amendment to Facility Operating License Number NPF-30 for the Callaway Plant. The amendment application addresses a non-conservative Technical Specification as discussed in NRC Administrative Letter 98-1 0, "Dispositioning of Technical Specifications That Are Insufficient To Assure Plant Safety."
The amendment application proposes changes to Technical Specification (TS) 3.7.9, "Ultimate Heat Sink (UHS)," to incorporate more restrictive UHS level and pond temperature limits which are specified in Surveillance Requirements (SRs) 3. 7. 9.1 and 3.7.9.2, respectively. In addition, new SR 3.7.9.4 would be added to verify that the UHS cooling tower fans respond appropriately to automatic start signals.
PO Box 620 Fulton, MD 65251 AmerenMissouri.com
ULNRC-05995 June 11,2013 Page 2 In Reference 2 above, the NRC requested additional information to complete their review, with a response within 30 days. The Enclosure to this letter provides the requested information. No commitments are contained in this letter.
If you have any questions on this amendment application, please contact me at (573) 676-8719 or Mr. Tom Elwood at (314) 225-1905.
I declare under penalty of perjury that the foregoing is true and correct.
Very truly yours, Executed on: la f I I /2.-o ~
~~~~0 Regulatory .Affairs Manager GGY/nls
Enclosure:
RAI Response
ULNRC-05995 June 11, 2013 Page 3 cc:
U.S. Nuclear Regulatory Commission (Original and 1 copy)
Attn: Document Control Desk Washington, DC 20555-0001 Mr. Arthur T. Howell Regional Administrator U.S. Nuclear Regulatory Commission Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511 Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 65077 Mr. Fred Lyon Project Manager, Callaway Plant Office ofNuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail Stop 0-8B 1 Washington, DC 20555-2738
ULNRC-05995 June 11, 2013 Page4 Index and send hardcopy to QA File A160.0761 Hardcopy:
Certrec Corporation 4150 International Plaza Suite 820 Fort Worth, TX 76109 (Certrec receives ALL attachments as long as they are non-safeguards and may be publicly disclosed.)
Electronic distribution for the following can be made via Tech Spec ULNRC Distribution:
A. C. Heflin F. M. Diya C. 0. Reasoner III B. L. Cox L. H. Graessle J. S. Geyer S. A. Maglio Corporate Communications NSRB Secretary T. B. Elwood G. G. Yates STARS Regulatory Affairs Mr. John O'Neill (Pillsbury, Winthrop, Shaw, Pittman LLP)
Missouri Public Service Commission Ms. Leanne Tippett Mosby (DNR)
Enclosure Page 1 of 4 By application dated December 13, 2012 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML12349A321), to the U.S. Nuclear Regulatory Commission (NRC), Union Electric Company (dba Ameren Missouri, the licensee) submitted a license amendment request to incorporate more restrictive ultimate heat sink (UHS) pond level and temperature limits which are specified in Surveillance Requirements (SRs) 3. 7. 9.1 and 3. 7. 9.2, respectively. In addition, new SR 3.7.9.4 would be added to verify that the UHS cooling tower fans respond appropriately to automatic start signals.
The NRC staff has determined that the additional information requested below is needed to complete its review.
Question:
- 1. The licensee stated on page 4 of the application that the UHS minimum water depth of 831.25 feet, as stated in the Callaway Safety Evaluation Report (SER), NUREG-0830, Supplement 4, Section 2.4.4, was previously accepted by the staff in 1984. However, due to the licensee's reassessment of the UHS based upon its National Pollutant Discharge Elimination System (NPDES) Permit, the licensee now proposes to increase the UHS minimum water depth to 834 feet.
Please provide justification for the reassessment of the UHS minimum water level from 831.25 feet to 834 feet, since it is not sufficiently described in the application. Describe any physical changes to the UHS design, analysis methodology, or operation that would allow the calculation of the UHS freeboard to show that UHS discharge at nearly 835.83 feet is now negligible.
Response
The basis behind the requested change to SR 3.7.9.1 (from 831.25 feet to 834 feet) is discussed on pages 11-12 of the License Amendment Request (LAR) Enclosure, Evaluation Section 3.0, with respect to the Calculation EF-123 input assumptions, and on page 23 of Evaluation Section 4.2 (response to 10 CFR 50.92 Question 3).
There have been no design changes to the physical dimensions of the UHS. Pages 5 and 6 of the LAR Enclosure provide specific details of the design changes that were implemented via modification package (MP) 11-0004 during the last operating cycle (Cycle 19) under 10 CFR 50.59. The nominal target level of the UHS retention pond and the non-safety related alarm setpoints (both high level and low level) were changed. An environmental evaluation was performed for MP 11-0004 which concluded that any risk of an overflow from the UHS, when operated within the band between the low and high level alarms (i.e., between the main control board annunciator window 55D low and high level alarms driven from level indicating switch EFLIS0027, a band ranging from 16'- 8" to 17'-10"), is extremely small.
Outfall17 (UHS spillway) is designated as a no discharge outfall. The increase in water elevation reduces the spillway freeboard thus decreasing the margin available on an NPDES
Enclosure Page 2 of4 permitted outfall.
MP 11-0004 Environmental Evaluation Summary The design basis maximum level for the UHS has always been 18 feet (1995'- 6" using the original SNUPPS power block elevation measuring convention) with an unchanged, original design spillway height of 18 feet 6 inches ( 1996'- 0"). The nominal target UHS level is now 17 feet ( 1994'- 6") with low and high alarms establishing a normal operating band between 16 feet 8 inches (1994'- 2") and 17 feet 10 inches (1995'- 4"). The high level alarm provides a 2-inch band (for level switch tolerance) below the UHS design basis maximum level of 18 feet.
Callaway Plant's current NPDES Permit (M0-0098001) does not allow discharges from the UHS spillway. Outfall 017 (the Ultimate Heat Sink) is a no discharge outfall. If the UHS were to overflow, that discharge would go to Stormwater Pond Outfall #011. This would represent a noncompliance with the NPDES Permit. However, the risk of any overflow from the UHS is extremely small. Operation at the high level alarm of 17'- 10" has been evaluated and would require sustained winds of 40 mph from the southwest producing waves of 8.4", in conjunction with instrument error (2" switch tolerance in the positive direction), in order to potentially push a small quantity of water over the spillway. Winds from other directions would have a reduced risk of overflow or, for some directions, no risk of overflow due to the reduced cross section for wind action and the lack of a spillway on the other three sides. The highest sustained winds recorded at the plant over the past two years were approximately 30 mph. Therefore, any risk of overflow from the UHS operating at the high alarm level of 17'- 10" is negligible.
The environmental evaluation concluded that MP 11-0004 does not involve a change that would cause a significant environmental impact previously evaluated in the Environmental Report (ER) or Final Environmental Statement- Operating License Stage (FES-OL). MP 11-0004 returned the operation of the UHS pond to its original operating design level. The only possible impact was determined to be an insignificant risk for a discharge from the UHS pond to Stormwater Outfall #011. This would result in a noncompliance with the current NPDES Permit. However, the likelihood of any overflow or spillage from the UHS is extremely remote as described above.
Makeup to the UHS pond and Essential Service Water system is from the plant service water system (clarified and treated river water) with some addition by rainfall. Chemical treatment is routinely completed for prevention of micro fouling and macro fouling in this system.
UHS Level Design and Alarm Changes UHS level is monitored and indicated by two non-safety related instrument loops, EFL-0027 A, ESW Pumphouse Forebay Level (Pump 'A') and EFL-0027, ESW Pumphouse Forebay Level (Pump 'B'). Both instrument loops measure from minus 232 inches to plus 8 inches level and indicate 0-100%. Both of these instrument loops feed computer points. Only the EFL-0027 instrument loop feeds high and low level alarms. This instrumentation has no safety function.
Enclosure Page 3 of4 Instrument loop EFL-0027 consists of a level element and indicating switch (EFLE0027, EFLIS0027). The switch feeds Main Control Board (MCB) Annunciator Window 55D, UHS Pond Level High or Low. It also feeds computer point EFL0027 (low level) and computer point EFL00278 (high level). The low setpoint actuates at 1994'- 2" and the high setpoint actuates at 1995'- 4" with a switch tolerance of plus or minus 2 inches. Both setpoints have a reset differential of2.4". The high setpoint is designed to prevent UHS overfilling. Overfilling the UHS would lead to an NPDES violation. This setpoint is also used to protect the High Density Polyethylene (HDPE) underground ESW piping (installed during the winter 2008- spring 2009).
Another function of the high alarm setpoint is to assure that water remains in the heated UHS Cooling Tower (CT) basin sump to assure the basin floor doesn't freeze. The low setpoint alarm alerts the control room operators that the UHS retention pond level is approaching the Technical Specification 3.7.9 minimum level.
The table below summarizes the UHS level setpoint changes.
UHS Level Setpoint Changes Previous Value Current Value Per Limit Before MP 11-0004 MP 11-0004 Differential HDPE Maximum Allowed 19' Unchanged NIA Level (1996'- 6")
UHS CT Sump Height 19' Unchanged NIA (1996'- 6")
Spillway Height 18'- 6" Unchanged NIA (1996' - 0")
Design Basis Maximum 18' Unchanged NIA Level (1995'- 6")
EFLIS0027 17'- 6" 17'- 10" 6" High Setpoint (1995') (1995'-4") (Note 1)
EFLIS0027 15'- 8" 16'- 8" 5.0" Low Setpoint (1993'- 2") (1994'- 2") (Note 2)
Required TS Minimum 13'- 3" 16'- 0" NIA Level ( 1990'- 9") (Note 2)
Pond Bottom 0' Unchanged NIA (1977'- 6")
Enclosure Page 4 of4 Notes:
- 1. 18'- 6" (Spillway Height)- 17'- 10" (high level alarm setpoint)- 2.0" (switch tolerance)= 6".
The normal UHS operating band will be set between 16'- 8" and 17'- 10" with a target nominal depth of 17'.
- 2. 16'- 8" (low level alarm setpoint)- 2.0" (switch tolerance)- 1" (wave action)- 16' (proposed TS 3.7.9 minimum level)= 5".
1" wave action has been added to the margin determination for conservatism. The level sensors are isolated from wind effects.
The following slide was presented during the meeting between Ameren Missouri and the NRC on August 29, 2012. It provides a visual aid for understanding the above information. There is an 18-inch difference between the nominal target level at which the UHS retention pond will be maintained and the elevation of the UHS spillway. Ameren Missouri believes a combination of this elevation difference, the 24-hour performance ofSR 3.7.9.1 to verify UHS level, and operator action taken in response to a high level alarm will prevent NPDES violations.
Site Layout
- Maximum Level
_ _ ,.,_.,--Elevation of Spillway
- Proposed Target Level
- Proposed Tech. Spec.
UHS Cooling Tower ~
3.25' -Current Tech. Spec.
I
- - -~
UHS Retention Pond
- Bottom of Pond (Reference Level)