GO2-08-090, Response to Request for Additional Information Related to License Amendment Request for Condensate Storage Tank Technical Specifications: Difference between revisions
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| issue date = 06/05/2008 | | issue date = 06/05/2008 | ||
| title = Response to Request for Additional Information Related to License Amendment Request for Condensate Storage Tank Technical Specifications | | title = Response to Request for Additional Information Related to License Amendment Request for Condensate Storage Tank Technical Specifications | ||
| author name = Gambhir S | | author name = Gambhir S | ||
| author affiliation = Energy Northwest | | author affiliation = Energy Northwest | ||
| addressee name = | | addressee name = | ||
| Line 18: | Line 18: | ||
=Text= | =Text= | ||
{{#Wiki_filter: | {{#Wiki_filter:Sudesh K. Gambhir ENERGY .Vice President, Technical Services P.O. Box 968, PE04 NORTHWEST Richland, WA 99352-0968 Ph. 509.377.8313 I F. 509.377.2354 sgambhir@energy-northwest.com June 5, 2008 G02-08-090 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 | ||
==Subject:== | ==Subject:== | ||
| Line 24: | Line 24: | ||
==References:== | ==References:== | ||
: 1) Letter dated May 2, 2008, CF Lyon (NRC) to JV Parrish (Energy Northwest),."Columbia Generating Station - Request for Additional Information Related to License Amendment Request Associated with Condensate Storage Tank Level (TAC No. MD6i 76))" | |||
: 2) Letter dated August 8, 2007, SK Gambhir (Energy Northwest) to NRC, "License Amendment Request to Technical Specifications Associated With Condensate Storage Tank Level" | |||
1) | ==Dear Sir or Madam:== | ||
Transmitted herewith in the attachment is Energy Northwest's response to the subject request for additional information (Reference 1) regarding the license amendment request (Reference 2) to revise Columbia Generating Station Technical Specifications associated with Condensate Storage Tank level. | |||
There are no new commitments being made. If you have any questions, please contact MC Humphreys, Licensing Supervisor at (509) 377-4025. | |||
I declare under penalty of perjury that the foregoing is true and correct. Executed on the date of this letter. | |||
SK ambhir Vice President, Technical.Services Attachments cc: EE Collins, Jr.- NRC RIV CF Lyon- NRC NRR RN Sherman - BPA/1 399 WA Horin -'Winston & Strawn 4c~Df NRC Senior Resident, Inspector/988C | |||
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REQUEST FOR CONDENSATE STORAGE TANK TECHNICAL SPECIFICATIONS Page 1 of 3 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION Item 1 The application dated August 8, 2007, states "...The level switches are not connected directly to the CSTs but rather on a standpipe located downstream on the suction line in the reactor building..." Please provide a drawing or sketch showing/illustrating the arrangement of the switches and standpipe. | |||
===Response=== | |||
See Attachment 2 for a simplified sketch. | |||
Item 2 The application dated August8, 2007, states "...Thus, they are influenced by such factors as differential head between the tank and the standpipe (due primarily to flow losses), reactor building temperature, and reactor building pressure. Previously the calculation did not address the head loss that occurs in the switches when the HPCS pump is drawing water from the CST..." Please provide either: | |||
: a. A copy of the calculation that determined the new levels for the sensors, or | |||
: b. A description/summary of the calculation describing the methodology, assumptions and significant parameters (e.g., pressures, temperatures, etc.). | |||
The description should be sufficient to support simplified confirmatory calculations by the staff. | |||
== | ===Response=== | ||
The following is a summary from the calculation describing the methodology, assumptions and significant parameters: | |||
Description The Condensate Storage Tanks (CSTs) are located outside the reactor building, subject to atmospheric pressure and temperature. The level switches, RCIC-LS-15A/B and HPCS-LS-1A/B are located on a standpipe inside the reactor building since the CSTs are not safety related. | |||
Parameters | |||
Description The Condensate Storage Tanks (CSTs) are located outside the reactor building, subject to atmospheric pressure and temperature. | |||
The level switches, RCIC-LS-15A/B and HPCS-LS-1A/B are located on a standpipe inside the reactor building since the CSTs are not safety related.Parameters | |||
* Top of suction pipe inside the CST is 446.302 feet elevation. | * Top of suction pipe inside the CST is 446.302 feet elevation. | ||
e Centerline of suction pipe is elevation 445.33 feet.0 Suction pipe diameter is 24 inches with 0.375" wall thickness. | e Centerline of suction pipe is elevation 445.33 feet. | ||
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REQUEST FOR CONDENSATE STORAGE TANK TECHNICAL SPECIFICATIONS | 0 Suction pipe diameter is 24 inches with 0.375" wall thickness. | ||
-1011)* The CST sees outside, ambient pressure." The standpipe temperature was assumed to be between 40 and 150 0 F." The CST temperature was assumed to be between 40 and 150 0 F." GE Process Diagram 02E22-04,7,1 gives a HPCS flow of 6856 gpm (bounding flow for purposes of this calculation). | |||
* Pipe resistance value (K) between the CST and the Standpipe is 348.386f, where f is the pipe friction factor for 24" pipe.Assumptions" The standpipe water in the reactor building sees a different ambient pressure than the water in the CST as the RB is kept at a negative pressure relative to its environment. | RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REQUEST FOR CONDENSATE STORAGE TANK TECHNICAL SPECIFICATIONS Page 2 of 3 | ||
Appendix D to E/1-02-91 | " Each 5.69 feet of water in a CST contains 67,500 gallons. | ||
-1011 conservatively calculates this differential pressure to be -3.5 inches water gauge relative to the outside environment taking into account instrument uncertainties. | " HPCS-LS-1 A/B and RCIC-LS-15A/B are located on the standpipe in the Reactor Building, nominal elevation 448.25 feet. (Nominal Set point 448.25 feet, highest possible activation 448.38', reference Energy Northwest calculation E/I-02-91 -1011) | ||
Thus, zero elevation at the CST is equivalent to a max of 3.5 inches at the standpipe." Ambient pressure difference may be less than 3.5 inches. However, this effect has been compensated for by the addition of 0.6ft (2 tanks) and 0.9ft (1 tank). After switch activation, additional water is. available (up to -1.8 inches depending on flow rate) since it takes time for the suction valve switchover to take place. This additional water volume is ignored for added conservatism." The standpipe water could be at a different temperature than the water in the CST, therefore it is assumed that the worst combinations of CST and Standpipe water temperatures are present (150°F at both tank and switch)." Although flow rate from each CST will be half of the total flow when two CST tanks are available, the analysis will assume all flow is from one CST tank, maximizing vortex height." Friction factor is 120% of Crane "Flow of Fluids" friction factor." Level switches activate at the highest possible point (when determining required level to ensure 135,000 gallons). | * The CST sees outside, ambient pressure. | ||
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REQUEST FOR CONDENSATE STORAGE TANK TECHNICAL SPECIFICATIONS | " The standpipe temperature was assumed to be between 40 and 150 0 F. | ||
This elevation is a combination of instrument setpoint, tolerances and instrument uncertainty. | " The CST temperature was assumed to be between 40 and 150 0 F. | ||
This highest possible activation point, per E/1-02-91 | " GE Process Diagram 02E22-04,7,1 gives a HPCS flow of 6856 gpm (bounding flow for purposes of this calculation). | ||
-1011, is 448.38 feet." Flow losses are calculated as follows: Flow losses (ft) = KV 2/2g K = pipe resistance V = velocity g = gravity" Using the conservatively higher value of 448.42 feet, the required elevation of water in both tanks is determined as such:-The required water elevation is the highest possible switch activation level (448.42 feet), plus-Flow losses (2.40 ft) between the CST and the standpipe in the reactor building (assume high flow rate and hot water when converting to feet of water column to maximize required elevation), minus-3.5 in (0.29 ft) ambient pressure difference between reactor building and CST, plus-0.6 feet (for conservatism) and 5.69 ft for two tank elevation, or-0.9 feet (for conservatism) and 2(5.69 ft) for one tank elevation. | * Pipe resistance value (K) between the CST and the Standpipe is 348.386f, where f is the pipe friction factor for 24" pipe. | ||
Required Level (2 tanks) = 448.42 ft + 2.40 ft -0.29 ft + 0.6 ft + 5.69 ft = 456.8 ft Required Level ( | Assumptions | ||
& 40B) receive level from transmitters actually located on the side of the tanks (COND-LT-40A | " The standpipe water in the reactor building sees a different ambient pressure than the water in the CST as the RB is kept at a negative pressure relative to its environment. Appendix D to E/1-02-91 -1011 conservatively calculates this differential pressure to be -3.5 inches water gauge relative to the outside environment taking into account instrument uncertainties. Thus, zero elevation at the CST is equivalent to a max of 3.5 inches at the standpipe. | ||
& 40B) which have a zero indication equal to 446.5 ft. Therefore, the minimum TS Level as observed on COND-LI 40 A& B would be as follows: 2 Tanks = 456.8 ft -446.5 ft + 0.2 ft (rounded up for readability) | " Ambient pressure difference may be less than 3.5 inches. However, this effect has been compensated for by the addition of 0.6ft (2 tanks) and 0.9ft (1 tank). After switch activation, additional water is. available (up to -1.8 inches depending on flow rate) since it takes time for the suction valve switchover to take place. This additional water volume is ignored for added conservatism. | ||
= 10.5 ft 1 Tank = 462.8 ft -446.5 ft + 0.2 ft (rounded up for readability) | " The standpipe water could be at a different temperature than the water in the CST, therefore it is assumed that the worst combinations of CST and Standpipe water temperatures are present (150°F at both tank and switch). | ||
= 16.5 ft Sf RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REQUEST FOR CONDENSATE STORAGE TANK TECHNICAL SPECIFICATIONS | " Although flow rate from each CST will be half of the total flow when two CST tanks are available, the analysis will assume all flow is from one CST tank, maximizing vortex height. | ||
" Friction factor is 120% of Crane "Flow of Fluids" friction factor. | |||
" Level switches activate at the highest possible point (when determining required level to ensure 135,000 gallons). | |||
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REQUEST FOR CONDENSATE STORAGE TANK TECHNICAL SPECIFICATIONS Page 3 of 3 Method for ensuring 135,000 gallons available | |||
" To ensure that 135,000 gallons will be used prior to switchover to the suppression pool, the highest possible activation elevation must be obtained from the instrument uncertainty analysis. This elevation is a combination of instrument setpoint, tolerances and instrument uncertainty. This highest possible activation point, per E/1-02-91 -1011, is 448.38 feet. | |||
" Flow losses are calculated as follows: | |||
Flow losses (ft) = KV 2/2g K = pipe resistance V = velocity g = gravity | |||
" Using the conservatively higher value of 448.42 feet, the required elevation of water in both tanks is determined as such: | |||
- The required water elevation is the highest possible switch activation level (448.42 feet), plus | |||
- Flow losses (2.40 ft) between the CST and the standpipe in the reactor building (assume high flow rate and hot water when converting to feet of water column to maximize required elevation), minus | |||
- 3.5 in (0.29 ft) ambient pressure difference between reactor building and CST, plus | |||
- 0.6 feet (for conservatism) and 5.69 ft for two tank elevation, or | |||
- 0.9 feet (for conservatism) and 2(5.69 ft) for one tank elevation. | |||
Required Level (2 tanks) = 448.42 ft + 2.40 ft - 0.29 ft + 0.6 ft + 5.69 ft = 456.8 ft Required Level (1tank) = 448.42 ft +2.40 ft - 0.29 ft + 0.9 ft + 11.38 ft = 462.8 ft | |||
" The instruments used by operators for verifying minimum Technical Specification (TS) CST level (COND-LI-40A & 40B) receive level from transmitters actually located on the side of the tanks (COND-LT-40A & 40B) which have a zero indication equal to 446.5 ft. Therefore, the minimum TS Level as observed on COND-LI 40 A | |||
& B would be as follows: | |||
2 Tanks = 456.8 ft - 446.5 ft + 0.2 ft (rounded up for readability) = 10.5 ft 1 Tank = 462.8 ft - 446.5 ft + 0.2 ft (rounded up for readability) = 16.5 ft | |||
Sf RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REQUEST FOR CONDENSATE STORAGE TANK TECHNICAL SPECIFICATIONS Page 1 of 1 Simplified CST Suction Schematic ArRe--act Seervice Buuilding Reactor HBuilding Suction. | |||
RCIC Suction Suction Condensate Supply}} | |||
Latest revision as of 16:50, 14 November 2019
| ML081640330 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 06/05/2008 |
| From: | Gambhir S Energy Northwest |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| GO2-08-090 | |
| Download: ML081640330 (5) | |
Text
Sudesh K. Gambhir ENERGY .Vice President, Technical Services P.O. Box 968, PE04 NORTHWEST Richland, WA 99352-0968 Ph. 509.377.8313 I F. 509.377.2354 sgambhir@energy-northwest.com June 5, 2008 G02-08-090 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001
Subject:
COLUMBIA GENERATING STATION, DOCKET NO. 50-397 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REQUEST FOR CONDENSATE STORAGE TANK TECHNICAL SPECIFICATIONS
References:
- 1) Letter dated May 2, 2008, CF Lyon (NRC) to JV Parrish (Energy Northwest),."Columbia Generating Station - Request for Additional Information Related to License Amendment Request Associated with Condensate Storage Tank Level (TAC No. MD6i 76))"
- 2) Letter dated August 8, 2007, SK Gambhir (Energy Northwest) to NRC, "License Amendment Request to Technical Specifications Associated With Condensate Storage Tank Level"
Dear Sir or Madam:
Transmitted herewith in the attachment is Energy Northwest's response to the subject request for additional information (Reference 1) regarding the license amendment request (Reference 2) to revise Columbia Generating Station Technical Specifications associated with Condensate Storage Tank level.
There are no new commitments being made. If you have any questions, please contact MC Humphreys, Licensing Supervisor at (509) 377-4025.
I declare under penalty of perjury that the foregoing is true and correct. Executed on the date of this letter.
SK ambhir Vice President, Technical.Services Attachments cc: EE Collins, Jr.- NRC RIV CF Lyon- NRC NRR RN Sherman - BPA/1 399 WA Horin -'Winston & Strawn 4c~Df NRC Senior Resident, Inspector/988C
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REQUEST FOR CONDENSATE STORAGE TANK TECHNICAL SPECIFICATIONS Page 1 of 3 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION Item 1 The application dated August 8, 2007, states "...The level switches are not connected directly to the CSTs but rather on a standpipe located downstream on the suction line in the reactor building..." Please provide a drawing or sketch showing/illustrating the arrangement of the switches and standpipe.
Response
See Attachment 2 for a simplified sketch.
Item 2 The application dated August8, 2007, states "...Thus, they are influenced by such factors as differential head between the tank and the standpipe (due primarily to flow losses), reactor building temperature, and reactor building pressure. Previously the calculation did not address the head loss that occurs in the switches when the HPCS pump is drawing water from the CST..." Please provide either:
- a. A copy of the calculation that determined the new levels for the sensors, or
- b. A description/summary of the calculation describing the methodology, assumptions and significant parameters (e.g., pressures, temperatures, etc.).
The description should be sufficient to support simplified confirmatory calculations by the staff.
Response
The following is a summary from the calculation describing the methodology, assumptions and significant parameters:
Description The Condensate Storage Tanks (CSTs) are located outside the reactor building, subject to atmospheric pressure and temperature. The level switches, RCIC-LS-15A/B and HPCS-LS-1A/B are located on a standpipe inside the reactor building since the CSTs are not safety related.
Parameters
- Top of suction pipe inside the CST is 446.302 feet elevation.
e Centerline of suction pipe is elevation 445.33 feet.
0 Suction pipe diameter is 24 inches with 0.375" wall thickness.
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REQUEST FOR CONDENSATE STORAGE TANK TECHNICAL SPECIFICATIONS Page 2 of 3
" Each 5.69 feet of water in a CST contains 67,500 gallons.
" HPCS-LS-1 A/B and RCIC-LS-15A/B are located on the standpipe in the Reactor Building, nominal elevation 448.25 feet. (Nominal Set point 448.25 feet, highest possible activation 448.38', reference Energy Northwest calculation E/I-02-91 -1011)
- The CST sees outside, ambient pressure.
" The standpipe temperature was assumed to be between 40 and 150 0 F.
" The CST temperature was assumed to be between 40 and 150 0 F.
" GE Process Diagram 02E22-04,7,1 gives a HPCS flow of 6856 gpm (bounding flow for purposes of this calculation).
- Pipe resistance value (K) between the CST and the Standpipe is 348.386f, where f is the pipe friction factor for 24" pipe.
Assumptions
" The standpipe water in the reactor building sees a different ambient pressure than the water in the CST as the RB is kept at a negative pressure relative to its environment. Appendix D to E/1-02-91 -1011 conservatively calculates this differential pressure to be -3.5 inches water gauge relative to the outside environment taking into account instrument uncertainties. Thus, zero elevation at the CST is equivalent to a max of 3.5 inches at the standpipe.
" Ambient pressure difference may be less than 3.5 inches. However, this effect has been compensated for by the addition of 0.6ft (2 tanks) and 0.9ft (1 tank). After switch activation, additional water is. available (up to -1.8 inches depending on flow rate) since it takes time for the suction valve switchover to take place. This additional water volume is ignored for added conservatism.
" The standpipe water could be at a different temperature than the water in the CST, therefore it is assumed that the worst combinations of CST and Standpipe water temperatures are present (150°F at both tank and switch).
" Although flow rate from each CST will be half of the total flow when two CST tanks are available, the analysis will assume all flow is from one CST tank, maximizing vortex height.
" Friction factor is 120% of Crane "Flow of Fluids" friction factor.
" Level switches activate at the highest possible point (when determining required level to ensure 135,000 gallons).
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REQUEST FOR CONDENSATE STORAGE TANK TECHNICAL SPECIFICATIONS Page 3 of 3 Method for ensuring 135,000 gallons available
" To ensure that 135,000 gallons will be used prior to switchover to the suppression pool, the highest possible activation elevation must be obtained from the instrument uncertainty analysis. This elevation is a combination of instrument setpoint, tolerances and instrument uncertainty. This highest possible activation point, per E/1-02-91 -1011, is 448.38 feet.
" Flow losses are calculated as follows:
Flow losses (ft) = KV 2/2g K = pipe resistance V = velocity g = gravity
" Using the conservatively higher value of 448.42 feet, the required elevation of water in both tanks is determined as such:
- The required water elevation is the highest possible switch activation level (448.42 feet), plus
- Flow losses (2.40 ft) between the CST and the standpipe in the reactor building (assume high flow rate and hot water when converting to feet of water column to maximize required elevation), minus
- 3.5 in (0.29 ft) ambient pressure difference between reactor building and CST, plus
- 0.6 feet (for conservatism) and 5.69 ft for two tank elevation, or
- 0.9 feet (for conservatism) and 2(5.69 ft) for one tank elevation.
Required Level (2 tanks) = 448.42 ft + 2.40 ft - 0.29 ft + 0.6 ft + 5.69 ft = 456.8 ft Required Level (1tank) = 448.42 ft +2.40 ft - 0.29 ft + 0.9 ft + 11.38 ft = 462.8 ft
" The instruments used by operators for verifying minimum Technical Specification (TS) CST level (COND-LI-40A & 40B) receive level from transmitters actually located on the side of the tanks (COND-LT-40A & 40B) which have a zero indication equal to 446.5 ft. Therefore, the minimum TS Level as observed on COND-LI 40 A
& B would be as follows:
2 Tanks = 456.8 ft - 446.5 ft + 0.2 ft (rounded up for readability) = 10.5 ft 1 Tank = 462.8 ft - 446.5 ft + 0.2 ft (rounded up for readability) = 16.5 ft
Sf RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REQUEST FOR CONDENSATE STORAGE TANK TECHNICAL SPECIFICATIONS Page 1 of 1 Simplified CST Suction Schematic ArRe--act Seervice Buuilding Reactor HBuilding Suction.
RCIC Suction Suction Condensate Supply