ML121240979
| ML121240979 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 05/03/2012 |
| From: | UniStar Nuclear Energy |
| To: | Office of New Reactors |
| Hearn, P, NRR 301-415-1189 | |
| References | |
| Download: ML121240979 (35) | |
Text
Public Meeting regarding issues related to Calvert Cliffs Nuclear Power Plant Unit 3 Ultimate Heat Sink Makeup.
UNISTAR NUCLEAR ENERGY May 3rd, 2012
The public meeting is regarding issues related to Ultimate Heat Sink (UHS) makeup.
Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
Introduction (1/2)
Several RAIs related to UHS Makeup were issued by the staff.
UniStar desired outcome is :
9 To present UHS Makeup design basis.
9 To present the path forward for RAIs answers.
9 To present the changes that UniStar intends to introduce.
9 To receive feedback from NRC on proposed approach.
2 M
Todays presentation was prepared by UniStar and is supported by BECHTEL (U.S. EPR & Calvert Cliffs Engineering).
Mark Finley (SVP Regulatory Affairs & Engineering, UniStar).
Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
Introduction (2/2)
Philippe Montigny (TI/BOP Engineer, Regulatory Affairs & Engineering, UniStar).
Shankar Rao (US EPR & Calvert Cliffs 3 COLA Project Engineer -
Bechtel).
Antonio Fernandez (Civil Engineer, Regulatory Affairs & Engineering, UniStar).
Cyril Roden (I&C Engineer, Regulatory Affairs & Engineering, UniStar).
Vincent Sorel (Director EPR Design, Regulatory Affairs & Engineering, UniStar).
3 M
Background and Overview of Submittal Strategy.
Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
Agenda Technical Issues:
9 UHS Makeup System Traveling Screens and Screen Wash System.
9 UHS Makeup System Piping and Valves.
9 UHS Makeup Structure and Seismic Analysis.
9 UHS Makeup System Instrumentation and Controls.
9 UHS Makeup System Operation.
9 UHS Makeup System Fukushima considerations.
Discussion and Feedback.
4 P
Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
Overview of the system Site Plot Plan 5
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Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
Overview of the system ESWS ESW System:
Takes suction from UHS cooling tower basin.
Provides cooling water to the Closed Cooling Water System (CCWC) heat exchangers (HX),
Emergency Diesel Generator (EDG) HXs, and the Essential Service Water (ESW) pump room coolers.
6 Structures System and Components (SSC) are designed to withstand the effects of natural phenomena (GDC-2).
Consists of four separate divisions (4x50%).
Two divisions operate during normal plant operation. Two divisions are required to achieve and maintain cold shutdown during normal operation and Design Basis Accident (DBA).
Receives makeup water from the non-safety related (desalinated water) makeup water system during normal operation.
Receives makeup water from safety-related emergency makeup water system drawn from UHS Intake Structure during DBA conditions.
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Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
Overview of the system UHS Emergency Makeup Water System UHS Emergency Makeup Water System:
Takes suction from UHS Intake Structure Forebay.
Provides emergency makeup water to the UHS cooling towers 7
Provides emergency makeup water to the UHS cooling towers.
Includes emergency makeup water pumps, discharge filter, intake water traveling screens and screen wash system and associated piping and valves.
SSCs are designed to withstand the effects of natural phenomena (GDC 2).
Consists of four separate divisions.
Remains on standby during normal power operation. Two divisions are required to maintain cold shutdown no sooner than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> after onset of a DBA.
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Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
Overview of the system UHS Makeup Water Intake Structure Plan View at EL. 11-6 8
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Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
Overview of the system UHS Makeup Water Intake Structure Section View 9
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UHS Makeup Water Intake Structure is part of Common Basemat Intake Structure and is founded on common basemat with Seismic Category I Forebay Structure and Seismic Category II Circulating Water Makeup Intake Structure.
UHS Makeup Water Intake Structure is analyzed and designed for natural phenomena including earthquake tornado and hurricanes Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
Overview of the UHS Makeup Water Intake Structure phenomena, including earthquake, tornado, and hurricanes missile barrier walls and roof slabs meet Region 1 design-basis tornado missile spectrum
seismic analysis and design is performed to a Site SSE
For redundancy, two 60" diameter Safety-Related Intake Pipes are used to bring water from Chesapeake Bay into Forebay Structure.
10 S
Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
Overview of the current UHS Makeup Water/Screen Wash Systems 11 S
Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
Overview of the Current UHS Makeup Water System 12 S
RAI Technical Issues can be associated into:
1.
UHS Makeup System Traveling Screens and Screen Wash System.
2.
UHS Makeup System Piping and Valves.
Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
UHS Makeup Technical Issues 3.
UHS Makeup Structure and Seismic Analysis.
4.
UHS Makeup System Instrumentation and Controls.
5.
UHS Makeup System Operation.
Considering these technical issues, UniStar decided :
9 To present UNE approach path forward for RAIs answers.
9 To present the important changes that UniStar intends to introduce.
13 M
Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 1. UHS Makeup System Traveling screens and Screen wash System (1/5)
Technical issue RAI #
UNE Approach UHS Makeup Water System Traveling Screens and S
W h S t
330 09.02.05-20 follow up to 279 09.02.05-5
- Change to Safety Related classification and Seismic Category I f
t li d
h 14 Screen Wash System design including internally generated missiles, environmental challenges (sand/silt, algae, debris, icing, etc), rotation.
Trash racks and traveling screen heat tracing, Maintenance Rule for traveling screen and screen wash system (GDC-2).
- The system components will be part of Reliability Assurance Program (RAP) and Maintenance Rule.
- Frequent rotation of traveling screens and screen wash will provide mitigation of ice effects on the traveling screens.
- The traveling screens are located in an enclosed area with temperature maintained at or above 41oF.
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Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 1. UHS Makeup System Traveling screens and Screen wash System (2/5)
Technical issue RAI #
UNE Approach Operating Experience (OE):
Duane Arnold (08/11/11) related 330 09.02.05-20 follow up to 279 09 02 05-5
- Intake pipes from Unit 1&2 Intake Forebay at 8 feet above 15 Duane Arnold (08/11/11) related to traveling screen failures.
Address a condition that resulted and prevented the ability to rotate traveling screens (intrusion of sand/silt).
279 09.02.05 5 Intake Forebay at 8 feet above the bottom.
- Long Intake channel in front of Units 1&2 Forebay.
- Frequent rotation and cleaning of Unit 3 Traveling Screens.
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Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 1. UHS Makeup System Traveling screens and Screen wash System (3/5)
Technical issue RAI #
UNE Approach Fitzpatrick (10/13/07):
ti f th t
li 330 09.02.05-20
- CCNP3 intake forebay has bar d t li 16 operations of the traveling screens is capable of removing large amounts of algae.
screens and traveling screens with automatic screen wash.
- Traveling screen can rotate continuously to clean out any debris resting on the screens, including algae.
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Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 1. UHS Makeup System Traveling screens and Screen wash System (4/5)
Technical issue RAI #
UNE Approach O
i E
i (OE) 330 09 02 0 20 CCNPP3 UHS i hd 17 Operating Experience (OE):
Hatch (7/23/01):
Operations of the traveling screens is capable of removing large amounts of debris.
330 09.02.05-20
- CCNPP3 UHS withdraws water from existing Units 1 & 2 common forebay at low flow velocity.
- Only neutrally buoyant debris likely to enter the CCNP3 intake forebay.
- CCNPP3 UHS screens are oversized for the flow capacity, and are capable of continuously rotating to remove debris.
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Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 1. UHS Makeup System Traveling screens and Screen wash System (5/5)
Technical issue RAI #
UNE Approach W lf C k (01/30/96) 330 09 02 0 20 CCNPP3 i k
f b
h 18 Wolf Creek (01/30/96):
Operations of the traveling screens is capable of facing icing that would possibly effect the operability of the traveling screens.
330 09.02.05-20
- CCNPP3 intake forebay has bar screens and traveling screens with automatic screen wash.
- The traveling screens are located in an enclosed area with temperature maintained at or above 41oF.
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Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 1. Overview of Proposed Changes for UHS Makeup Water/Screen Wash Systems 19 Traveling Screens are Safety Related All of the screen wash system is Safety Related S
Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 2. UHS Makeup Water System Piping and Valves (1/4)
Technical issue RAI #
UNE Approach UHS Makeup Water System buried pipe protection against natural phenomena.
328 02.04.10-1
- Buried piping of sufficient depths under competent structural backfill will be provided to protect against potential scour/erosion due to natural flooding phenomena 20 phenomena.
- Also the buried piping will be designed to the same requirements (including loading conditions involving natural phenomena) as defined in U.S.
UHS Makeup water pipe dry layup and piping material selected.
332 09.02.05-22 follow-up to 279 09.02.05-5
- Change the system using filled pipes.
- Piping material is super austenitic stainless steel.
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Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 2. UHS Makeup Water System Piping and Valves (2/4)
Technical issue RAI #
UNE Approach Clarify if periodic in-service testing of buried piping in FSAR 3.8.4.7 apply to all buried piping and UHS Makeup Water System pipes.
333 03.08.04-31 supplemental to 310 03.08.04-26
- In-service Inspections apply to all safety-related buried steel pipes exposed to low pH groundwater in the power block including UHSMW and ESW 21 g
pipes.
- Periodic inspection of components necessary to maintain the integrity/capability of the system will comply with GDC 45.
- Inspection will be performed in accordance with the ASME Section XI and OM code.
- FSAR will be updated to reflect the above requirements.
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Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 2. UHS Makeup Water System Piping and Valves (3/4)
Technical issue RAI #
UNE Approach Relatively small diameter clarification.
336 09.02.05-25 follow up to 279 09.02.05-14
- Relatively small diameter for the UHS makeup water system refers to 8 diameter pipe.
t 336 09 02 05 27 A
ITAAC ill b dd d t if 22 ITAAC - EPR FSAR: emergency makeup water system provides a means to limit corrosion and address ITAAC as it relates to temp. <95F, limits corrosion, scaling and fouling, and semi-automatic fill from dry layup 336 09.02.05-27 follow up to 279 09.02.05-17
UHS Makeup water system piping is compatible with the Chesapeake Bay water chemistry. No additional treatment is anticipated.
System will be filled (wet layup) during standby condition.
Address Initial Test Program for system and Update Initial Test Program for manner in which Chemical Treatment subsystem is used 337 09.02.05-27 follow up to 173 14.02-51
- Due to periodic flushing of the makeup water system piping, no chemical treatment is necessary.
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Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 2. UHS Makeup Water System Piping and Valves (4/4)
Technical issue RAI #
UNE Approach CCNP3 FSAR 3.9.6.1: Indicate where UHS Makeup water system design features/provisions addressing flow-induced loading/degraded flow conditions to alleviate debris/impurities/
contaminants are located in U.S. EPR FSAR or CCNP3 FSAR, or Specify the information in COLA FSAR.
340 03.09.06-3
- Appropriate CCNP3 FSAR Section will be updated as part of the response.
23 CCNP3 FSAR Table 3.9-2 (In-service Valve Testing Program Requirements): Identify the list of manual valves and types for UHS Makeup water system and update Note 10 accordingly, or justify deferral of the specification of these In-service Test information.
340 03.09.06-4
- Type of manual valves will be listed in FSAR Table 3.9-2 and Note 10 will be modified to reflect expected current design, consistent with response that will be provided to NRC.
CCNP3 FSAR Table 3.9-2 (In-service Valve Testing Program Requirements): Provide the response describing changes in FSAR Table 3.9-2 and their justifications from COLA Revision 6 to Revisions 7 & 8.
340 03.09.06-5
- FSAR Table 3.9-2 Revisions 7/8 were made to reflect the changes to UHS Makeup water intake structure electrical and pump room and associated HVAC. RAI response will be provided to identify this.
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Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 2. Overview of Proposed Changes for Site-Specific ESW Emergency Makeup Water Supply Keep-Fill Line 24 S
Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 3. UHS Makeup Structure and Seismic Analysis (1/3)
Technical issue RAI #
UNE approach Buried duct banks and buried pipes seismic Category I structures, level of design information.
333 03.08.04-29 supplemental to 144 03.08.04-7 The seismic design of buried pipes and duct banks will be performed according to ASCE 4-98 and ASCE Report, Seismic Response of Buried 25 p
Pipes and Structural Components.
Use of the waterproofing system for Seismic Category I foundations below grade.
333 03.08.04-30 follow up to 301 03.08.04-22 EPGB foundation is above groundwater table and will not require waterproofing MWIS is not exposed to aggressive environment.
FSAR markups will be provided and inconsistencies will be addressed.
A
Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 3. UHS Makeup Structure and Seismic Analysis (2/3)
Technical issue RAI #
UNE Approach Only the East wall is subjected 333 03.08.04-32 supplemental
- Breaking wave pressure will be 26 y
j to breaking wave pressure.
Clarify if the run-up water elevation has been taken into account.
pp to 310 03.08.04-27 g
p included in other walls
- Clarification will be provided that water levels presented in FSAR Figure 2.4-26 reflects wave run-up due to Probable Maximum Hurricane (PMH).
A
Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 3. UHS Makeup Structure and Seismic Analysis (3/3)
Technical issue RAI #
UNE Approach Conservatism of the SRSS method, with respect to the algebraic summation method 339 03.08.04-33 follow up to 301 03.08.04-18
- The design of the structure will be performed with the use of the algebraic summation 27 used in Design Certification.
method.
Provide the maximum pressures considering all locations of the CBIS basemat.
Provide calculation procedure detail and comparison between STAAD Pro FE model and SSI results.
339 03.08.04-34 follow up to 301 03.08.04-20
- Contour plots of bearing pressure distribution will be provided. The procedures will be described in more detail.
A
Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 4. UHS Makeup System Instrumentation and Controls (1/2)
Technical issue RAI #
UNE Approach Following information are required :
325 07.05-1
- U.S. EPR FSAR Chapter 7 is incorporated by reference.
- There is no site-specific stand alone safety related I&C t
t t it ifi SSC f ti 28 1/ I&C systems that control the site-specific system.
2/ If control is operated by a safety-related, stand-alone system, describe how it meets applicable I&C requirements.
3/ A description of the types of control (automatic and/or manual control.
system to support site specific SSCs function.
- UHS Makeup System operation is manually initiated from the Main Control Room by Operator based on the UHS Cooling Tower Basin Level.
- Safety-related automatic controls will be supported by the Safety Automation System (SAS).
- Detailed type of control (Manual/Auto) will be provided.
C
Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 4. UHS Makeup System Instrumentation and Controls (2/2)
Technical issue RAI #
UNE answer Clarify I&C status/alarms.
336 09.02.05-24 follow up to 279 09.02.05-7
- Traveling Screen motor, and automatic backwash filter motor status and loss of heat tracing 29 alarm will be described in the FSAR.
C CCNPP3 FSAR chap 7 will be updated as appropriate to provide the adequate level of information (especially with respect to the functions supported by the Safety Automation System).
Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 5. UHS Makeup Water System Operation (1/3)
Technical issue RAI #
UNE approach Operator actions necessary to rotate and wash screens, and adding method of operation to Technical Specification 330 09.02.05-20 follow up to 279 09.02.05-5
- Traveling screens are capable of automatic rotation and screen wash.
- No local manual actions of 30 p
Surveillance Requirements.
the traveling screens are required.
Operation RAI regarding dry layup 24-month testing, operator actions required for filling piping, procedures for performing surveillance including filling dry pipe and valve positions for dry layup.
332 09.02.05-22 follow up to 279 09.02.05-10
- System will have wet layup.
- Quarterly functional test will be performed to verify UHS pump performance and flush the piping system.
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Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 5. UHS Makeup Water System Operation (2/3)
Technical issue RAI #
UNE approach 10 CFR 50.36 Technical Specification Criterion 3 application : TS LCO and SR description.
336 09.02.05-23 Add a new Limiting Condition for Operation for the required number of operable UHS make-up trains to site-specific Technical Specifications.
Add Surveillance Requirements to if ti f t li 31 verify proper operation of traveling screens and screen wash systems and forebay level.
Clarify the basin level controls for initiation of makeup on SI signal, and the use of the screen wash pumps for filling of the system.
336 09.02.05-24 follow up to 279 09.02.05-7
- Basin level controls provide alarm (at low water level) to the Control Room operator to initiate UHS Makeup Water System.
- Following the initiation, the basin level controls will automatically maintain the water level in the basin by modulating the UHS Emergency Makeup Water isolation valve.
- Initial filling of the system will be achieved by slow opening of the UHS Makeup water Pump discharge valves with makeup pump operation.
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Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
- 5. UHS Makeup Water System Operation (3/3)
Technical issue RAI #
UNE approach The following items are not specifically stated as being tested and should be included in the test abstract:
- Testing of screen water system and pumps, traveling screens, and strainers.
337 14.02-58
- All items associated with this RAI will be incorporated in FSAR Section 14.2.14, COL Applicant Site Specific Tests, as applicable.
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- Verification of minimum Technical Specification flow rates for the system.
- Testing of water hammer design features, such as time delays on valves.
- Testing of normal or accident ESW (Essential Service Water) basin makeup controls.
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SRM-SECY-12-025 - Recommendation 2.1 : Perform design-basis external hazards reevaluations using present-day methodologies and guidance:
- Tier 1: Seismic, flooding hazards.
- Tier 2: Other external hazards.
-> The CC3 COLA uses the latest guidance for evaluating the external hazards (CEUS seismic input data soil loads flood possibilities extreme wind and tornado loads Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
UHS Fukushima considerations seismic input data, soil loads, flood possibilities, extreme wind and tornado loads, missiles and temperatures ), and for assessing the related plant protection (GDC 2).
-> In response to 50.54 (f) letter, operating plants would apply hazard assessment methodology and insights being used for COL applications.
SRM-SECY-12-025 - Recommendation 4.2: Mitigation strategy for beyond-design-basis external events:
- Maintain and restore core cooling, containment and spent fuel pool cooling capabilities in case of a simultaneous loss of all AC power and loss of normal access to the UHS.
-> Following a beyond-design external event, the CC3 Mitigation Strategy takes credit of installed and portable equipment, that does not depend on the UHS makeup availability.
33 V
Next Step: RAI responses.
Submittal June 22, 2012.
Issues related to Calvert Cliffs Ultimate Heat Sink Makeup UHS Makeup Technical Issues Will address issues not requiring detailed design change information or new analysis.
Will provide a schedule for remaining RAI responses.
34 M
Discussion and Feedback Issues related to Calvert Cliffs Ultimate Heat Sink Makeup.
UHS Makeup Technical Issues Discussion and Feedback.
35 M