ML12292A404: Difference between revisions

From kanterella
Jump to navigation Jump to search
(Created page by program invented by StriderTol)
(StriderTol Bot change)
 
Line 18: Line 18:


=Text=
=Text=
{{#Wiki_filter:ULNRC-05919 October 17, 2012                                                     Page 1 of 34 CALLAWAY PLANT UNIT 1 LICENSE RENEWAL APPLICATION REQUEST FOR ADDITIONAL INFORMATION (RAI) RESPONSE TO ITEMS 5D, 7A, 7B, TABLES 7-1, 8-1, 9-1, AND 11-1
{{#Wiki_filter:ULNRC-05919 October 17, 2012 Page 1 of 34 CALLAWAY PLANT UNIT 1 LICENSE RENEWAL APPLICATION REQUEST FOR ADDITIONAL INFORMATION (RAI) RESPONSE TO ITEMS 5D, 7A, 7B, TABLES 7-1, 8-1, 9-1, AND 11-1  


ULNRC-05919 October 17, 2012                                                                             Page 2 of 34 RAI 5.d:
ULNRC-05919 October 17, 2012 Page 2 of 34 RAI 5.d:
Note 1 to Table F.3-2 states, "The current plant procedures and training meet current industry standards. There are no additional specific procedure improvements that could be identified that would affect the result of the human error probability (HEP) calculations. Therefore, no SAMA items were added to the plant specific list of SAMAs as a result of the human actions on the list of basic events with RRW greater than 1.005." This appears to imply that meeting current industry standards is sufficient to indicate that no additional SAMAs are needed.
Note 1 to Table F.3-2 states, "The current plant procedures and training meet current industry standards. There are no additional specific procedure improvements that could be identified that would affect the result of the human error probability (HEP) calculations. Therefore, no SAMA items were added to the plant specific list of SAMAs as a result of the human actions on the list of basic events with RRW greater than 1.005." This appears to imply that meeting current industry standards is sufficient to indicate that no additional SAMAs are needed.
: i. Provide additional information to justify the conclusion stated as indicated above.
: i. Provide additional information to justify the conclusion stated as indicated above.
Line 26: Line 26:
iii. Discuss whether any of the risk significant operator action failures could be addressed by options other than training or procedures such as automated functions, testing, and maintenance to reduce failure or event rates, or enhanced documentation. Specifically discuss the potential for automating the function associated with basic event OP-XHE-FO-CCWRHX (OPERATOR FAILS TO INITIATE CCW FLOW TO THE RHR HXS) identified in Table 3-2.
iii. Discuss whether any of the risk significant operator action failures could be addressed by options other than training or procedures such as automated functions, testing, and maintenance to reduce failure or event rates, or enhanced documentation. Specifically discuss the potential for automating the function associated with basic event OP-XHE-FO-CCWRHX (OPERATOR FAILS TO INITIATE CCW FLOW TO THE RHR HXS) identified in Table 3-2.
Callaway Response In order to perform a cost/benefit analysis of any change, the impact on the calculated Human Error Probability must be determined. Discussion with the HRA analysts indicate that based on the current structure and format of the existing procedures, any incremental improvements or changes made to training or procedures would not result in the ability to take additional credit in the HRA because in general full credit is already taken. Improvements may be possible through re-ordering steps in the EOP network to improve timing, however, since Callaway uses the standardized EOP network significant changes in EOP structure would result in compliance issues with EOP configuration control. The current standardized EOP structure is based on the deterministic safety analysis, not a PRA analysis, thus while there may be PRA improvements there are significant analysis and infrastructure changes that would have to be implemented Industry-wide to change the standardized structure. Any enhancements that could be made within the standardized structure have either already been made at Callaway or would not result in additional significant credit in the HEP determination. With no significant change to the HEP, the benefit of making the change would be negligible.
Callaway Response In order to perform a cost/benefit analysis of any change, the impact on the calculated Human Error Probability must be determined. Discussion with the HRA analysts indicate that based on the current structure and format of the existing procedures, any incremental improvements or changes made to training or procedures would not result in the ability to take additional credit in the HRA because in general full credit is already taken. Improvements may be possible through re-ordering steps in the EOP network to improve timing, however, since Callaway uses the standardized EOP network significant changes in EOP structure would result in compliance issues with EOP configuration control. The current standardized EOP structure is based on the deterministic safety analysis, not a PRA analysis, thus while there may be PRA improvements there are significant analysis and infrastructure changes that would have to be implemented Industry-wide to change the standardized structure. Any enhancements that could be made within the standardized structure have either already been made at Callaway or would not result in additional significant credit in the HEP determination. With no significant change to the HEP, the benefit of making the change would be negligible.
The note was not intended to state that no opportunities for improvement exist, rather that there would be no calculated dollar value benefit from any improvements made. Plant personnel are always encouraged to use the corrective action process to identify potential improvements. In addition, the PRA group reviews and actively participates in changes made to Operating Procedures to evaluate impact on the PRA as well as suggest improvements.
The note was not intended to state that no opportunities for improvement exist, rather that there would be no calculated dollar value benefit from any improvements made. Plant personnel are always encouraged to use the corrective action process to identify potential improvements. In addition, the PRA group reviews and actively participates in changes made to Operating Procedures to evaluate impact on the PRA as well as suggest improvements.  


ULNRC-05919 October 17, 2012                                                                           Page 3 of 34 In general, operator actions credited in the Level 1 PRA, are proceduralized in the EOP and OTO procedure network. The EOP/OTO procedures address both cognition and execution as follows:
ULNRC-05919 October 17, 2012 Page 3 of 34 In general, operator actions credited in the Level 1 PRA, are proceduralized in the EOP and OTO procedure network. The EOP/OTO procedures address both cognition and execution as follows:
x Cognition - specifically they identify the primary cue (instrumentation or alarm needed to make the diagnosis) x Execution - specifically they identify the tasks needed to accomplish the required action).
x Cognition - specifically they identify the primary cue (instrumentation or alarm needed to make the diagnosis) x Execution - specifically they identify the tasks needed to accomplish the required action).
The EOP/OTO procedures are highly trained on both in the classroom and to the extent possible in the simulator or through job performance measures. All EOPs are required to be trained on at least once every six years. In general, most EOPS are trained on several times a year in both the simulator and class room training. There is a six week training cycle and each crew will spend one week in simulator and/or class room training during each six week cycle.
The EOP/OTO procedures are highly trained on both in the classroom and to the extent possible in the simulator or through job performance measures. All EOPs are required to be trained on at least once every six years. In general, most EOPS are trained on several times a year in both the simulator and class room training. There is a six week training cycle and each crew will spend one week in simulator and/or class room training during each six week cycle.
The trainers review the procedures regularly to identify areas where the training crews have encountered difficulty and update the procedures accordingly. EOP/OTO Writers manual APA-ZZ-00102 is the guidance document the procedure writers follow to ensure that the procedures are written to be consistent with industry standards.
The trainers review the procedures regularly to identify areas where the training crews have encountered difficulty and update the procedures accordingly. EOP/OTO Writers manual APA-ZZ-00102 is the guidance document the procedure writers follow to ensure that the procedures are written to be consistent with industry standards.
As part of the HRA task the EOP and OTO procedures are reviewed to ensure that credited operator actions in the PRA are proceduralized in the same context as the EOPS/OTOs. The HRA task accounts for the following:
As part of the HRA task the EOP and OTO procedures are reviewed to ensure that credited operator actions in the PRA are proceduralized in the same context as the EOPS/OTOs. The HRA task accounts for the following:
x   Procedure Context -Does the procedure match the modeled PRA scenario, x   Procedure Structure - Response not obtained column format vs. paragraphs of instructions, x   Procedure Wording - Does the procedure wording have a double negative, x   Distinction of important steps (boxed, bulleted, bolded, etc),
x Procedure Context -Does the procedure match the modeled PRA scenario, x
x   Time to reach the required procedure step.
Procedure Structure - Response not obtained column format vs. paragraphs of instructions, x
Procedure Wording - Does the procedure wording have a double negative, x
Distinction of important steps (boxed, bulleted, bolded, etc),
x Time to reach the required procedure step.
If the HEP is dominated by a single failure mechanism such as an ambiguously worded statement or not enough time to reach the required procedure step, then these findings are passed back to the Callaway training department and procedure revisions are made within the limitations of standardized procedures, as applicable.
If the HEP is dominated by a single failure mechanism such as an ambiguously worded statement or not enough time to reach the required procedure step, then these findings are passed back to the Callaway training department and procedure revisions are made within the limitations of standardized procedures, as applicable.
The Callaway training department maintains a listing of time critical deterministic and PRA risk significant actions in procedure APA-ZZ-00395. On a defined cycle, the deterministic operator actions are evaluated/validated in the simulator, including timing of events. There is considerable overlap in the deterministic operator actions and the PRA risk significant actions and timing information from these validations is used to evaluate the assumptions in the HRA.
The Callaway training department maintains a listing of time critical deterministic and PRA risk significant actions in procedure APA-ZZ-00395. On a defined cycle, the deterministic operator actions are evaluated/validated in the simulator, including timing of events. There is considerable overlap in the deterministic operator actions and the PRA risk significant actions and timing information from these validations is used to evaluate the assumptions in the HRA.
This training identifies procedure ambiguities associated with the procedure guidance for most actions credited in the PRA. These completions times are not requirements but are intended to be nominal average estimates that most crews can achieve. Following the completion of a major PRA update APA-ZZ-00395 is updated.
This training identifies procedure ambiguities associated with the procedure guidance for most actions credited in the PRA. These completions times are not requirements but are intended to be nominal average estimates that most crews can achieve. Following the completion of a major PRA update APA-ZZ-00395 is updated.
As part of PRA Update 5, all Level 1 post-initiator operator actions were reviewed and updated to align with the current EOP/OTO procedure revisions and training. As part of this update, all
As part of PRA Update 5, all Level 1 post-initiator operator actions were reviewed and updated to align with the current EOP/OTO procedure revisions and training. As part of this update, all  


ULNRC-05919 October 17, 2012                                                                           Page 4 of 34 risk-significant scenarios were talked through with Callaway trainers and insights from recent simulator training were incorporated into the updated HRA.
ULNRC-05919 October 17, 2012 Page 4 of 34 risk-significant scenarios were talked through with Callaway trainers and insights from recent simulator training were incorporated into the updated HRA.
The process followed for this HRA update was:
The process followed for this HRA update was:
: 1. Identify - Each PRA scenario was reviewed in the context of the appropriate EOP to ensure that the as-operated plant is reflected in the HRA.
: 1. Identify - Each PRA scenario was reviewed in the context of the appropriate EOP to ensure that the as-operated plant is reflected in the HRA.
Line 50: Line 53:
The cost of adding hardware systems to automatically perform the actions represented by important human actions is high. This cost has been shown in a number of SAMA submittals to sometimes be order(s) of magnitude higher than the benefit achieved.
The cost of adding hardware systems to automatically perform the actions represented by important human actions is high. This cost has been shown in a number of SAMA submittals to sometimes be order(s) of magnitude higher than the benefit achieved.
Other non-procedural changes such as additional maintenance and testing would not necessarily reduce risk significant human errors. Most equipment related failures are induced by human errors during testing or maintenance. The benefits of increasing the occurrence of tests and maintenance diminish at the point where additional maintenance or restoration errors are introduced or at the point where undue wear and tear occurs. Callaway's maintenance and testing program uses vendor recommended test and maintenance intervals as well as operating experience in an attempt to optimize mechanical reliability. Randomly increasing test and maintenance over the recommended intervals is perceived to have no mechanical reliability benefit; but would pose an increase in maintenance and restoration errors as well as wear and tear.
Other non-procedural changes such as additional maintenance and testing would not necessarily reduce risk significant human errors. Most equipment related failures are induced by human errors during testing or maintenance. The benefits of increasing the occurrence of tests and maintenance diminish at the point where additional maintenance or restoration errors are introduced or at the point where undue wear and tear occurs. Callaway's maintenance and testing program uses vendor recommended test and maintenance intervals as well as operating experience in an attempt to optimize mechanical reliability. Randomly increasing test and maintenance over the recommended intervals is perceived to have no mechanical reliability benefit; but would pose an increase in maintenance and restoration errors as well as wear and tear.
Corresponding Amendment Changes No changes to the License Renewal Application (LRA) are needed as a result of this response.
Corresponding Amendment Changes No changes to the License Renewal Application (LRA) are needed as a result of this response.  


ULNRC-05919 October 17, 2012                                                                             Page 5 of 34 RAI 7.a:
ULNRC-05919 October 17, 2012 Page 5 of 34 RAI 7.a:
A note at the end of Table F.5-1 indicates that recent industry submittals of like-kind plants (i.e.,
A note at the end of Table F.5-1 indicates that recent industry submittals of like-kind plants (i.e.,
Wolf Creek, South Texas, Diablo Canyon, and Seabrook) were used as a source of candidate SAMAs. The extent to which these submittals were examined is not clear, as only two SAMA candidates were identified in Table F.5-1 as being from these sources (I.e., SAMA 162 and 165). Also, it appears that a cost beneficial SAMA identified in the Diablo Canyon submittal might represent an unevaluated SAMA candidate for Callaway (Le., SAMA 24 -Prevent clearing of RCS cold leg water seals). Describe the extent to which the four cited SAMA submittals were used as sources to generate candidate SAMAs and evaluate each SAMA determined to be cost beneficial in those submittals or show how they could be screened out using criteria presented in ER Section F.6.0. If the SAMA review for a submittal has been completed, use the cost beneficial SAMAs as reported in the respective site specific volume of NUREG-1437, "Generic Environmental Impact Statement for License Renewal of Nuclear Plants."
Wolf Creek, South Texas, Diablo Canyon, and Seabrook) were used as a source of candidate SAMAs. The extent to which these submittals were examined is not clear, as only two SAMA candidates were identified in Table F.5-1 as being from these sources (I.e., SAMA 162 and 165). Also, it appears that a cost beneficial SAMA identified in the Diablo Canyon submittal might represent an unevaluated SAMA candidate for Callaway (Le., SAMA 24 -Prevent clearing of RCS cold leg water seals). Describe the extent to which the four cited SAMA submittals were used as sources to generate candidate SAMAs and evaluate each SAMA determined to be cost beneficial in those submittals or show how they could be screened out using criteria presented in ER Section F.6.0. If the SAMA review for a submittal has been completed, use the cost beneficial SAMAs as reported in the respective site specific volume of NUREG-1437, "Generic Environmental Impact Statement for License Renewal of Nuclear Plants."
Line 58: Line 61:
The SAMA section of the Environmental Report for each of the listed submittals was reviewed.
The SAMA section of the Environmental Report for each of the listed submittals was reviewed.
The site specific volume of NUREG-1437 was reviewed for those plants where one was available. For each SAMA item the descriptions and decisions of the cost/benefit analysis were reviewed for applicability and site specific cost/benefit to Callaway. The tables below show the Callaway disposition for each plant's potentially cost beneficial SAMAs.
The site specific volume of NUREG-1437 was reviewed for those plants where one was available. For each SAMA item the descriptions and decisions of the cost/benefit analysis were reviewed for applicability and site specific cost/benefit to Callaway. The tables below show the Callaway disposition for each plant's potentially cost beneficial SAMAs.
Wolf Creek SAMA Description                                   Callaway Disposition SAMA 2: Modify controls and operating               The Callaway AEPS design already maintains procedures to permit the diesel generators at       constant AC power up to the safety the Sharpe Station to be more rapidly aligned       related/non-safety related separation breakers to the WCGS emergency buses in SBO                  with the breaker controls located in the main events.                                            control room. The AEPS diesel generators automatically start and supply AC power up to the separation breakers on loss of the normal supply; and, if required, the manual diesel controls are also located in the main control room.
Wolf Creek SAMA Description Callaway Disposition SAMA 2: Modify controls and operating procedures to permit the diesel generators at the Sharpe Station to be more rapidly aligned to the WCGS emergency buses in SBO events.
SAMA 4: Proceduralize operator actions to           Callaway procedure ECA-1.2 contains perform local isolations of any valves that fail    direction for operators to manually close all to close remotely in an interfacing system          valves in ISLOCA pathways that are located LOCA.                                              outside containment if the valves cannot be closed from the control room.
The Callaway AEPS design already maintains constant AC power up to the safety related/non-safety related separation breakers with the breaker controls located in the main control room. The AEPS diesel generators automatically start and supply AC power up to the separation breakers on loss of the normal supply; and, if required, the manual diesel controls are also located in the main control room.
SAMA 4: Proceduralize operator actions to perform local isolations of any valves that fail to close remotely in an interfacing system LOCA.
Callaway procedure ECA-1.2 contains direction for operators to manually close all valves in ISLOCA pathways that are located outside containment if the valves cannot be closed from the control room.  


ULNRC-05919 October 17, 2012                                                                               Page 6 of 34 SAMA 5: Modify procedures to open                   SAMA 80 has been modified to indicate that emergency diesel generator room doors to            procedural guidance to open doors or provide provide alternate room cooling given failure of      alternate ventilation following loss of EDG the heating ventilation and air-conditioning        HVAC is potentially cost beneficial.
ULNRC-05919 October 17, 2012 Page 6 of 34 SAMA 5: Modify procedures to open emergency diesel generator room doors to provide alternate room cooling given failure of the heating ventilation and air-conditioning (HVAC) supply fan.
(HVAC) supply fan.
SAMA 80 has been modified to indicate that procedural guidance to open doors or provide alternate ventilation following loss of EDG HVAC is potentially cost beneficial.
SAMA 1: Install a permanent, dedicated               SAMA 187 has been added. AEPS was generator for the NCP in order to provide RCP       installed with a spare breaker that could be seal cooling in SBO events.                          used to supply the NCP. This SAMA is considered potentially cost beneficial.
SAMA 1: Install a permanent, dedicated generator for the NCP in order to provide RCP seal cooling in SBO events.
SAMA 3: Provide the capability to cross-tie         This SAMA was evaluated using case 4KV2 between 4-kilovolts (kV) AC buses in the event       and was determined to have a benefit of $13K of a loss of power to one bus.                      with a 95% CDF benefit of $27K. Callaway SAMA 11 has been modified to consider this SAMA to be potentially cost beneficial. A physical cross-tie exists, but there is no analysis or procedures to allow its use except in specific conditions with offsite power available. Associated Costs are to develop procedures and analysis to allow use of the cross-tie with the Emergency Diesel Generators. The SAMA is already evaluated as potentially cost beneficial; however, it should be noted that the calculated benefit is somewhat under-estimated since it was evaluated only for SBO sequences.
SAMA 187 has been added. AEPS was installed with a spare breaker that could be used to supply the NCP. This SAMA is considered potentially cost beneficial.
SAMA 13: Install an alternative fuel oil tank       This SAMA is included as Callaway SAMA 162 with gravity feed capability to address fuel oil    and has been determined to be potentially cost transfer failure events.                            beneficial.
SAMA 3: Provide the capability to cross-tie between 4-kilovolts (kV) AC buses in the event of a loss of power to one bus.
SAMA 14: Install a permanent, dedicated             SAMA 188 has been added. This SAMA was generator for the NCP, and a motor-driven           evaluated using case SBOMOD2 and was AFW pump and battery charger to address             determined to have a benefit of $182K with a SBO events in which the TD AFW pump is              95% CDF benefit of $385K. AEPS was unavailable.                                        installed with a spare breaker and expansion capability which could be used to supply various equipment. This SAMA is considered potentially cost beneficial.
This SAMA was evaluated using case 4KV2 and was determined to have a benefit of $13K with a 95% CDF benefit of $27K. Callaway SAMA 11 has been modified to consider this SAMA to be potentially cost beneficial. A physical cross-tie exists, but there is no analysis or procedures to allow its use except in specific conditions with offsite power available. Associated Costs are to develop procedures and analysis to allow use of the cross-tie with the Emergency Diesel Generators. The SAMA is already evaluated as potentially cost beneficial; however, it should be noted that the calculated benefit is somewhat under-estimated since it was evaluated only for SBO sequences.
SAMA 13: Install an alternative fuel oil tank with gravity feed capability to address fuel oil transfer failure events.
This SAMA is included as Callaway SAMA 162 and has been determined to be potentially cost beneficial.
SAMA 14: Install a permanent, dedicated generator for the NCP, and a motor-driven AFW pump and battery charger to address SBO events in which the TD AFW pump is unavailable.
SAMA 188 has been added. This SAMA was evaluated using case SBOMOD2 and was determined to have a benefit of $182K with a 95% CDF benefit of $385K. AEPS was installed with a spare breaker and expansion capability which could be used to supply various equipment. This SAMA is considered potentially cost beneficial.
Case SBOMOD This SAMA case was analyzed by multiplying the frequency of all SBO sequences by 1.0E-01 which represents the total failure probability of the operator errors and hardware failures associated with operation of the equipment that would be made available due to this modification.
Case SBOMOD This SAMA case was analyzed by multiplying the frequency of all SBO sequences by 1.0E-01 which represents the total failure probability of the operator errors and hardware failures associated with operation of the equipment that would be made available due to this modification.
No changes were made to support system modeling.
No changes were made to support system modeling.  


ULNRC-05919 October 17, 2012                                                                                 Page 7 of 34 Case SBOMOD2 This SAMA case was analyzed by multiplying the frequency of all SBO sequences by 5.0E-02 which represents the total failure probability of the operator errors and hardware failures associated with operation of the equipment that would be made available due to this modification. No changes were made to support system modeling.
ULNRC-05919 October 17, 2012 Page 7 of 34 Case SBOMOD2 This SAMA case was analyzed by multiplying the frequency of all SBO sequences by 5.0E-02 which represents the total failure probability of the operator errors and hardware failures associated with operation of the equipment that would be made available due to this modification. No changes were made to support system modeling.
Case 4KV2 This SAMA case was analyzed by modifying the fault trees to include a cross-tie to the other 4KV AC bus and diesel generator. Only SBO sequences were solved and the results combined with the remainder of the baseline model results. The probability of failure for the cross-tie was assigned a probability of 5.0E-02. The cross-tie failure event was removed from cutsets containing the failures of both EDGs (including those caused by support equipment). No changes were made to support system modeling. The calculated benefit under-estimates the actual benefit since the benefit was only determined for SBO sequences. The benefit for other sequences could not be determined without extensive modifications to the PRA model.
Case 4KV2 This SAMA case was analyzed by modifying the fault trees to include a cross-tie to the other 4KV AC bus and diesel generator. Only SBO sequences were solved and the results combined with the remainder of the baseline model results. The probability of failure for the cross-tie was assigned a probability of 5.0E-02. The cross-tie failure event was removed from cutsets containing the failures of both EDGs (including those caused by support equipment). No changes were made to support system modeling. The calculated benefit under-estimates the actual benefit since the benefit was only determined for SBO sequences. The benefit for other sequences could not be determined without extensive modifications to the PRA model.
The low benefit of this SAMA is attributed to the AEPS AC power supply that can be controlled from the main control room and the ability to have AEPS aligned to either 4KV bus and the ability to use the non-safety auxiliary feed pump.
The low benefit of this SAMA is attributed to the AEPS AC power supply that can be controlled from the main control room and the ability to have AEPS aligned to either 4KV bus and the ability to use the non-safety auxiliary feed pump.
Seabrook SAMA Description                                   Callaway Disposition SAMA 157: Provide independent AC power               This item is considered implemented at source for battery chargers                          Callaway. Procedures and equipment exist that will provide temporary portable power sources for the battery chargers.
Seabrook SAMA Description Callaway Disposition SAMA 157: Provide independent AC power source for battery chargers This item is considered implemented at Callaway. Procedures and equipment exist that will provide temporary portable power sources for the battery chargers.
SAMA 165: RWST fill from firewater during           This item is considered implemented at containment injectionModify 6 inch RWST             Callaway. Procedures and equipment exist to flush flange to have a 21/2-inch female fire hose     connect fire water to the RWST.
SAMA 165: RWST fill from firewater during containment injectionModify 6 inch RWST flush flange to have a 21/2-inch female fire hose adapter with isolation valve This item is considered implemented at Callaway. Procedures and equipment exist to connect fire water to the RWST.
adapter with isolation valve SAMA 192: Install a globe valve or flow             This item is considered to be N/A for Callaway.
SAMA 192: Install a globe valve or flow limiting orifice upstream in the fire protection system This item is considered to be N/A for Callaway.
limiting orifice upstream in the fire protection    This is a plant specific internal flooding issue system                                              that was not identified for Callaway.
This is a plant specific internal flooding issue that was not identified for Callaway.
SAMA 193: Hardware change to eliminate               This item is considered to be N/A for Callaway.
SAMA 193: Hardware change to eliminate MOV AC power dependency This item is considered to be N/A for Callaway.
MOV AC power dependency                              This is a plant specific PRA importance issue that was not identified for Callaway.
This is a plant specific PRA importance issue that was not identified for Callaway.  


ULNRC-05919 October 17, 2012                                                                             Page 8 of 34 South Texas Project South Texas Project has no potentially cost beneficial SAMA items.
ULNRC-05919 October 17, 2012 Page 8 of 34 South Texas Project South Texas Project has no potentially cost beneficial SAMA items.
Diablo Canyon SAMA Description                                 Callaway Disposition SAMA 12: Improve Fire Barriers for ASW and       This item is considered to be N/A for Callaway.
Diablo Canyon SAMA Description Callaway Disposition SAMA 12: Improve Fire Barriers for ASW and CCW Equipment in the Cable Spreading Room This item is considered to be N/A for Callaway.
CCW Equipment in the Cable Spreading              This is a plant specific fire related issue that Room                                              was not identified for Callaway.
This is a plant specific fire related issue that was not identified for Callaway.
SAMA 13: Improve Cable Wrap for the               This item is considered to be N/A for Callaway.
SAMA 13: Improve Cable Wrap for the PORVs in the Cable Spreading Room This item is considered to be N/A for Callaway.
PORVs in the Cable Spreading Room                This is a plant specific fire related issue that was not identified for Callaway.
This is a plant specific fire related issue that was not identified for Callaway.
SAMA 24: Prevent Clearing of RCS Cold Leg         This SAMA is included as Callaway SAMA 179 Water Seals                                      and has been determined to be potentially cost beneficial.
SAMA 24: Prevent Clearing of RCS Cold Leg Water Seals This SAMA is included as Callaway SAMA 179 and has been determined to be potentially cost beneficial.
SAMA 25: Fill or Maintain Filled The Steam       This item is considered implemented at Generators to Scrub Fission Products              Callaway. The Emergency Operating Procedures contain direction to maintain steam generator level above the tubes.
SAMA 25: Fill or Maintain Filled The Steam Generators to Scrub Fission Products This item is considered implemented at Callaway. The Emergency Operating Procedures contain direction to maintain steam generator level above the tubes.
Also refer to Tables 7-1, 8-1, 9-1, and 11-1 which directly follow this response.
Also refer to Tables 7-1, 8-1, 9-1, and 11-1 which directly follow this response.
Corresponding Amendment Changes No changes to the License Renewal Application (LRA) are needed as a result of this response.
Corresponding Amendment Changes No changes to the License Renewal Application (LRA) are needed as a result of this response.  


ULNRC-05919 October 17, 2012 Enclosure 1                                                                                                        Page 9 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway                                                                     % Red.
ULNRC-05919 October 17, 2012 Page 9 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion
SAMA                                                                  % Red. In OS   SAMA       SAMA Case                       % Red IN Number      Potential Improvement                  Discussion          In CDF Dose    Case      Description    Benefit  Cost    OECR   Cost Basis Evaluation     Basis for Evaluation 1   Provide additional DC battery   Extended DC power             12.17% 10.87% NOSBO No Station Blackout   $360K     >$1M   10.49%   Expert   Not Cost- Cost will exceed benefit.
% Red.
capacity.                      availability during an SBO.                        Events                                            Panel    Beneficial 2   Replace lead-acid batteries     Extended DC power             12.17% 10.87% NOSBO No Station Blackout   $360K     >$1M   10.49%   Expert   Not Cost- Cost will exceed benefit.
In CDF
with fuel cells.                availability during an SBO.                        Events                                            Panel    Beneficial 5   Provide DC bus cross-ties.     Improved availability of DC 0.30% 0.00%       DC01 TDAFW no DC             $1K   >$199K   0.03%   Expert   Not Cost- Cost will exceed benefit.
% Red.
power system.                                      Dependency                                        Panel    Beneficial 11   Improve 4.16-kV bus cross-     Increased availability of on- 0.26% 0.58%     4kv2 Add 4KV cross-tie     $13K   <$100K   0.58%   Expert   Potentially Physical cross-tie exists, tie ability.                    site AC power.                                    capability for SBO                                Panel      Cost-    but there is no analysis or sequences                                                  Beneficial procedures to allow its use except in specific outage conditions. Cost is to develop procedures and analysis to allow use of the cross-tie. Benefit calculated is under-estimated since it was evaluated for only SBO sequences.
In OS Dose SAMA Case SAMA Case Description Benefit Cost
15   Install tornado protection on   Increased availability of on- 2.65% 4.35%   LOSP1 No tornado related     $91K   >$500K   3.38%   Expert   Not Cost- Cost will exceed benefit.
% Red IN OECR Cost Basis Evaluation Basis for Evaluation 1
gas turbine generator.          site AC power.                                    LOSP                                              Panel    Beneficial 24   Bury off-site power lines.     Improved off-site power       40.66% 41.30% NOLOSP Eliminate all Loss of $1.2M     >$3M   35.28%   Expert   Not Cost- Cost will exceed benefit.
Provide additional DC battery capacity.
reliability during severe                          Offsite Power Events                              Panel    Beneficial Previous SAMA submittals weather.                                                                                                                  have estimated approximately $1M per mile.
Extended DC power availability during an SBO.
25   Install an independent active   Improved prevention of         2.77% 0.00% LOCA12 No failures of the     $48K     >$1M     0.35%   Expert   Not Cost- Cost will exceed benefit.
12.17% 10.87%
or passive high pressure       core melt sequences.                              charging or SI pumps                              Panel    Beneficial injection system.
NOSBO No Station Blackout Events
26    Provide an additional high      Reduced frequency of core     2.77% 0.00% LOCA12 No failures of the     $48K     >$1M     0.35%   Expert   Not Cost- Cost will exceed benefit.
$360K  
pressure injection pump with    melt from small LOCA and                          charging or SI pumps                              Panel    Beneficial independent diesel.            SBO sequences.
>$1M 10.49%
28   Add a diverse low pressure     Improved injection             3.19% 2.17% LOCA03 No failure of low     $65K     >$1M     1.01%   Expert   Not Cost- Cost will exceed benefit.
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
injection system.              capability.                                        pressure injection                                Panel    Beneficial 29   Provide capability for         Improved injection                                                                                           Potentially SAMA is judged to be low alternate injection via diesel- capability.                                                                                                      Cost-    cost, but analysis is driven fire pump.                                                                                                                              Beneficial needed to determine impacts of injection of non-borated water to RCS.
2 Replace lead-acid batteries with fuel cells.
Expert Panel judged this SAMA to be potentially cost-beneficial without determining an actual benefit or cost.
Extended DC power availability during an SBO.
12.17% 10.87%
NOSBO No Station Blackout Events
$360K  
>$1M 10.49%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
5 Provide DC bus cross-ties.
Improved availability of DC power system.
0.30%
0.00%
DC01 TDAFW no DC Dependency
$1K  
>$199K 0.03%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
11 Improve 4.16-kV bus cross-tie ability.
Increased availability of on-site AC power.
0.26%
0.58%
4kv2 Add 4KV cross-tie capability for SBO sequences
$13K  
<$100K 0.58%
Expert Panel Potentially Cost-Beneficial Physical cross-tie exists, but there is no analysis or procedures to allow its use except in specific outage conditions. Cost is to develop procedures and analysis to allow use of the cross-tie. Benefit calculated is under-estimated since it was evaluated for only SBO sequences.
15 Install tornado protection on gas turbine generator.
Increased availability of on-site AC power.
2.65%
4.35%
LOSP1 No tornado related LOSP
$91K  
>$500K 3.38%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
24 Bury off-site power lines.
Improved off-site power reliability during severe weather.
40.66% 41.30% NOLOSP Eliminate all Loss of Offsite Power Events
$1.2M  
>$3M 35.28%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
Previous SAMA submittals have estimated approximately $1M per mile.
25 Install an independent active or passive high pressure injection system.
Improved prevention of core melt sequences.
2.77%
0.00%
LOCA12 No failures of the charging or SI pumps
$48K  
>$1M 0.35%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
26 Provide an additional high pressure injection pump with independent diesel.
Reduced frequency of core melt from small LOCA and SBO sequences.
2.77%
0.00%
LOCA12 No failures of the charging or SI pumps
$48K  
>$1M 0.35%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
28 Add a diverse low pressure injection system.
Improved injection capability.
3.19%
2.17%
LOCA03 No failure of low pressure injection
$65K  
>$1M 1.01%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
29 Provide capability for alternate injection via diesel-driven fire pump.
Improved injection capability.
Potentially Cost-Beneficial SAMA is judged to be low cost, but analysis is needed to determine impacts of injection of non-borated water to RCS.
Expert Panel judged this SAMA to be potentially cost-beneficial without determining an actual benefit or cost.  


ULNRC-05919 October 17, 2012 Enclosure 1                                                                                                  Page 10 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway                                                                 % Red.
ULNRC-05919 October 17, 2012 Page 10 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion
SAMA                                                            % Red. In OS   SAMA       SAMA Case                       % Red IN Number      Potential Improvement            Discussion          In CDF  Dose    Case        Description      Benefit  Cost    OECR   Cost Basis Evaluation     Basis for Evaluation 39   Replace two of the four     Reduced common cause          2.77% 0.00%  LOCA12 No failures of the      $48K    >$1M    0.35%    Expert    Not Cost-  Cost will exceed benefit.
% Red.
electric safety injection   failure of the safety                              charging or SI pumps                              Panel    Beneficial pumps with diesel-powered   injection system. This pumps.                      SAMA was originally intended for the Westinghouse-CE System 80+, which has four trains of safety injection.
In CDF
However, the intent of this SAMA is to provide diversity within the high-and l 41    Create a reactor coolant    Allows low pressure          0.78% 0.00% DEPRESS No failures of         $12K  >$500K    0.27%   Expert   Not Cost- Cost will exceed benefit.
% Red.
depressurization system. emergency core cooling                             depressurization                                  Panel    Beneficial system injection in the event of small LOCA and high-pressure safety injection failure.
In OS Dose SAMA Case SAMA Case Description Benefit Cost
43   Add redundant DC control   Increased availability of     0.30% 0.00%   SW01 Service Water Pumps     $1K   >$100K   0.06%   Expert   Not Cost- Cost will exceed benefit.
% Red IN OECR Cost Basis Evaluation Basis for Evaluation 39 Replace two of the four electric safety injection pumps with diesel-powered pumps.
power for SW pumps.        SW.                                                not dependent on DC                              Panel    Beneficial Power 46   Add a service water pump. Increased availability of   17.60% 27.72%   SW02 No failures of ESW     $636K   >$5M   23.26%   Expert   Not Cost- Cost will exceed benefit.
Reduced common cause failure of the safety injection system. This SAMA was originally intended for the Westinghouse-CE System 80+, which has four trains of safety injection.
cooling water.                                    pumps                                            Panel    Beneficial 54   Increase charging pump lube Increased time before         0.48% 0.00%   CHG01 Charging pumps not       $4K   >$100K   0.06%   Expert   Not Cost- Cost will exceed benefit.
However, the intent of this SAMA is to provide diversity within the high-and l 2.77%
oil capacity.              charging pump failure due                          dependent on cooling                              Panel    Beneficial to lube oil overheating in                        water.
0.00%
loss of cooling water sequences.
LOCA12 No failures of the charging or SI pumps
55    Install an independent      Reduced frequency of core    5.54% 0.00% RCPLOCA No RCP Seal LOCAs       $94K   >$1M     0.21%   Expert   Not Cost- Cost will exceed benefit.
$48K
reactor coolant pump seal  damage from loss of                                                                                  Panel    Beneficial Previous investigation into injection system, with      component cooling water,                                                                                                  installing such a system dedicated diesel.          service water, or station                                                                                                concluded that operators blackout.                                                                                                                did not have sufficient time to place the system in service prior to seal damage.
>$1M 0.35%
56   Install an independent     Reduced frequency of core     5.54% 0.00% RCPLOCA No RCP Seal LOCAs       $94K   >$500K   0.21%   Expert   Not Cost- Cost will exceed benefit.
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
reactor coolant pump seal  damage from loss of                                                                                  Panel    Beneficial injection system, without  component cooling water dedicated diesel.          or service water, but not a station blackout.
41 Create a reactor coolant depressurization system.
58    Install improved reactor    Reduced likelihood of         5.54% 0.00% RCPLOCA No RCP Seal LOCAs       $94K   >$3M     0.21%   Expert   Not Cost- Cost will exceed benefit.
Allows low pressure emergency core cooling system injection in the event of small LOCA and high-pressure safety injection failure.
coolant pump seals.         reactor coolant pump seal                                                                           Panel    Beneficial LOCA.
0.78%
59    Install an additional      Reduced likelihood of loss    3.61% 0.00%   CCW01 No failures of the CCW $59K   >$1M     0.07%   Expert   Not Cost- Cost will exceed benefit.
0.00%
component cooling water    of component cooling water                        Pumps                                            Panel    Beneficial pump.                      leading to a reactor coolant pump seal LOCA.
DEPRESS No failures of depressurization
$12K
>$500K 0.27%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
43 Add redundant DC control power for SW pumps.
Increased availability of SW.
0.30%
0.00%
SW01 Service Water Pumps not dependent on DC Power
$1K  
>$100K 0.06%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
46 Add a service water pump.
Increased availability of cooling water.
17.60% 27.72%
SW02 No failures of ESW pumps
$636K  
>$5M 23.26%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
54 Increase charging pump lube oil capacity.
Increased time before charging pump failure due to lube oil overheating in loss of cooling water sequences.
0.48%
0.00%
CHG01 Charging pumps not dependent on cooling water.
$4K  
>$100K 0.06%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
55 Install an independent reactor coolant pump seal injection system, with dedicated diesel.
Reduced frequency of core damage from loss of component cooling water, service water, or station blackout.
5.54%
0.00%
RCPLOCA No RCP Seal LOCAs  
$94K  
>$1M 0.21%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
Previous investigation into installing such a system concluded that operators did not have sufficient time to place the system in service prior to seal damage.
56 Install an independent reactor coolant pump seal injection system, without dedicated diesel.
Reduced frequency of core damage from loss of component cooling water or service water, but not a station blackout.
5.54%
0.00%
RCPLOCA No RCP Seal LOCAs  
$94K  
>$500K 0.21%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
58 Install improved reactor coolant pump seals.
Reduced likelihood of reactor coolant pump seal LOCA.
5.54%
0.00%
RCPLOCA No RCP Seal LOCAs  
$94K  
>$3M 0.21%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
59 Install an additional component cooling water pump.
Reduced likelihood of loss of component cooling water leading to a reactor coolant pump seal LOCA.
3.61%
0.00%
CCW01 No failures of the CCW Pumps
$59K  
>$1M 0.07%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.  


ULNRC-05919 October 17, 2012 Enclosure 1                                                                                                          Page 11 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway                                                                     % Red.
ULNRC-05919 October 17, 2012 Page 11 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion
SAMA                                                                % Red. In OS SAMA         SAMA Case                         % Red IN Number      Potential Improvement                Discussion          In CDF  Dose    Case        Description      Benefit  Cost    OECR   Cost Basis   Evaluation     Basis for Evaluation 64   Implement procedure and       Improved ability to cool       5.39% 0.76% FWCCW Evaluate fire water       $104K   <$150K 0.77%%     Expert     Potentially The cost estimate is for hardware modifications to      residual heat removal heat                    2    hookup to RHR HX                                    Panel        Cost    development of a allow manual alignment of      exchangers.                                                                                                          Beneficial procedure and use of the fire water system to the                                                                                                                                  temporary connections.
% Red.
component cooling water                                                                                                                                        Cost of permanent system, or install a                                                                                                                                          modification would be component cooling water                                                                                                                                        significantly higher.
In CDF
header cross-tie.
% Red.
65   Install a digital feed water   Reduced chance of loss of     1.57% 0.00%   FW01 No loss of Feedwater     $29K     $19M     0.49%   Callaway     Not Cost- Cost will exceed benefit.
In OS Dose SAMA Case SAMA Case Description Benefit Cost
upgrade.                      main feed water following a                        Events                                            Modification  Beneficial plant trip.                                                                                              Costs 71   Install a new condensate       Increased availability of the 1.14% 0.00%   CST01 CST does not deplete     $18K   >$2.5M   0.24%   Expert     Not Cost- Cost will exceed benefit.
% Red IN OECR Cost Basis Evaluation Basis for Evaluation 64 Implement procedure and hardware modifications to allow manual alignment of the fire water system to the component cooling water system, or install a component cooling water header cross-tie.
storage tank (auxiliary        auxiliary feedwater system.                                                                              Panel      Beneficial feedwater storage tank).
Improved ability to cool residual heat removal heat exchangers.
77   Provide a passive,             Reduced potential for core     1.57% 0.00%   FW01 No loss of Feedwater     $29K     $>1M     0.49%   Expert     Not Cost- Cost will exceed benefit.
5.39%
secondary-side heat-          damage due to loss-of-                              Events                                              Panel      Beneficial rejection loop consisting of a feedwater events.
0.76%
condenser and heat sink.
FWCCW 2
79   Replace existing pilot-       Increased probability of       3.43% 2.17%   FB01 Only one PORV             $79K   >$500K   1.68%   Expert     Not Cost- Cost will exceed benefit.
Evaluate fire water hookup to RHR HX
operated relief valves with    successful feed and bleed.                          required for Feed &                                  Panel      Beneficial larger ones, such that only                                                        Bleed one is required for successful feed and bleed.
$104K  
80   Provide a redundant train or   Increased availability of     6.08% 4.35%   HVAC   No dependencies on       $156K   <$100K   3.87%   Expert     Potentially Procedures to open doors means of ventilation.          components dependent on                            HVAC                                                Panel        Cost    or provide temporary room cooling.                                                                                                        Beneficial ventilation may be cost beneficial for the EDGs, MDAFW pumps, and charging pumps.
<$150K 0.77%%
Expert Panel Potentially Cost Beneficial The cost estimate is for development of a procedure and use of temporary connections.
Cost of permanent modification would be significantly higher.
65 Install a digital feed water upgrade.
Reduced chance of loss of main feed water following a plant trip.
1.57%
0.00%
FW01 No loss of Feedwater Events
$29K  
$19M 0.49%
Callaway Modification Costs Not Cost-Beneficial Cost will exceed benefit.
71 Install a new condensate storage tank (auxiliary feedwater storage tank).
Increased availability of the auxiliary feedwater system.
1.14%
0.00%
CST01 CST does not deplete  
$18K  
>$2.5M 0.24%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
77 Provide a passive, secondary-side heat-rejection loop consisting of a condenser and heat sink.
Reduced potential for core damage due to loss-of-feedwater events.
1.57%
0.00%
FW01 No loss of Feedwater Events
$29K  
$>1M 0.49%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
79 Replace existing pilot-operated relief valves with larger ones, such that only one is required for successful feed and bleed.
Increased probability of successful feed and bleed.
3.43%
2.17%
FB01 Only one PORV required for Feed &
Bleed
$79K  
>$500K 1.68%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
80 Provide a redundant train or means of ventilation.
Increased availability of components dependent on room cooling.
6.08%
4.35%
HVAC No dependencies on HVAC
$156K  
<$100K 3.87%
Expert Panel Potentially Cost Beneficial Procedures to open doors or provide temporary ventilation may be cost beneficial for the EDGs, MDAFW pumps, and charging pumps.
Procedures for opening doors to the DC switchgear rooms exist.
Procedures for opening doors to the DC switchgear rooms exist.
87   Replace service and           Elimination of instrument     0.36% 0.00% INSTAIR Eliminate all instrument   $2K   >$500K   0.06%   Expert     Not Cost- Cost will exceed benefit.
87 Replace service and instrument air compressors with more reliable compressors which have self-contained air cooling by shaft driven fans.
instrument air compressors    air system dependence on                            air failures                                        Panel      Beneficial with more reliable            service water cooling.
Elimination of instrument air system dependence on service water cooling.
compressors which have self-contained air cooling by shaft driven fans.
0.36%
91   Install a passive containment Improved containment         19.52% 36.96% CONT01 No failures due to       $793K   >$10M   31.32%   Expert     Not Cost- Cost will exceed benefit.
0.00%
spray system.                  spray capability.                                  containment                                          Panel      Beneficial overpressure 93   Install an unfiltered,         Increased decay heat         19.52% 36.96% CONT01 No failures due to       $793K     >$2M   31.32%   Expert     Not Cost- Cost will exceed benefit.
INSTAIR Eliminate all instrument air failures
hardened containment vent. removal capability for non-                         containment                                          Panel      Beneficial ATWS events, without                                overpressure scrubbing released fission products.
$2K  
94    Install a filtered containment Increased decay heat          19.52% 36.96% CONT01 No failures due to       $793K     >$2M   31.32%   Expert     Not Cost- Cost will exceed benefit.
>$500K 0.06%
vent to remove decay heat. removal capability for non-                        containment                                          Panel      Beneficial Option 1: Gravel Bed Filter;  ATWS events, with                                  overpressure Option 2: Multiple Venturi    scrubbing of released Scrubber                      fission products.
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
91 Install a passive containment spray system.
Improved containment spray capability.
19.52% 36.96% CONT01 No failures due to containment overpressure
$793K  
>$10M 31.32%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
93 Install an unfiltered, hardened containment vent.
Increased decay heat removal capability for non-ATWS events, without scrubbing released fission products.
19.52% 36.96% CONT01 No failures due to containment overpressure
$793K  
>$2M 31.32%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
94 Install a filtered containment vent to remove decay heat.
Option 1: Gravel Bed Filter; Option 2: Multiple Venturi Scrubber Increased decay heat removal capability for non-ATWS events, with scrubbing of released fission products.
19.52% 36.96% CONT01 No failures due to containment overpressure
$793K  
>$2M 31.32%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.  


ULNRC-05919 October 17, 2012 Enclosure 1                                                                                                Page 12 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway                                                                   % Red.
ULNRC-05919 October 17, 2012 Page 12 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion
SAMA                                                                % Red. In OS SAMA       SAMA Case                   % Red IN Number      Potential Improvement                Discussion        In CDF  Dose  Case        Description  Benefit  Cost    OECR   Cost Basis Evaluation   Basis for Evaluation 96   Provide post-accident         Reduced likelihood of         0.48% 0.00% H2BURN No hydrogen         $10K   >$100K   0.44%   Expert   Not Cost- Cost will exceed benefit.
% Red.
containment inerting          hydrogen and carbon                              burns/explosions                              Panel    Beneficial capability.                    monoxide gas combustion.
In CDF
97   Create a large concrete       Increased cooling and                        MAB                            >$10M    Note 1    Expert    Not Cost-  Cost will exceed benefit.
% Red.
crucible with heat removal     containment of molten core                                                                      Panel    Beneficial potential to contain molten   debris. Molten core debris core debris.                  escaping from the vessel is contained within the crucible and a water cooling mechanism cools the molten core in the crucible, preventing melt-through of the base mat.
In OS Dose SAMA Case SAMA Case Description Benefit Cost
98    Create a core melt source      Increased cooling and                        MAB                             >$10M   Note 1   Expert   Not Cost- Cost will exceed benefit.
% Red IN OECR Cost Basis Evaluation Basis for Evaluation 96 Provide post-accident containment inerting capability.
reduction system.             containment of molten core                                                                     Panel    Beneficial debris. Refractory material would be placed underneath the reactor vessel such that a molten core falling on the material would melt and combine with the material.
Reduced likelihood of hydrogen and carbon monoxide gas combustion.
0.48%
0.00%
H2BURN No hydrogen burns/explosions
$10K  
>$100K 0.44%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
97 Create a large concrete crucible with heat removal potential to contain molten core debris.
Increased cooling and containment of molten core debris. Molten core debris escaping from the vessel is contained within the crucible and a water cooling mechanism cools the molten core in the crucible, preventing melt-through of the base mat.
MAB  
>$10M Note 1 Expert Panel Not Cost-Beneficial Cost will exceed benefit.
98 Create a core melt source reduction system.
Increased cooling and containment of molten core debris. Refractory material would be placed underneath the reactor vessel such that a molten core falling on the material would melt and combine with the material.
Subsequent spreading and heat removal from the vitrified compound would be facilitated, and concrete attack would not occur.
Subsequent spreading and heat removal from the vitrified compound would be facilitated, and concrete attack would not occur.
99    Strengthen                    Reduced probability of      19.52% 36.96% CONT01 No failures due to $1.2M  >$10M   31.32%    Expert   Not Cost- Cost will exceed benefit.
MAB
primary/secondary             containment over-                                containment                                  Panel    Beneficial containment (e.g., add         pressurization.                                  overpressure ribbing to containment shell).
>$10M Note 1 Expert Panel Not Cost-Beneficial Cost will exceed benefit.
100    Increase depth of the          Reduced probability of                       MAB                            >$10M   Note 1    Expert   Not Cost- Cost will exceed benefit.
99 Strengthen primary/secondary containment (e.g., add ribbing to containment shell).
concrete base mat or use an   base mat melt-through.                                                                          Panel    Beneficial alternate concrete material to ensure melt-through does not occur.
Reduced probability of containment over-pressurization.
102   Construct a building to be     Reduced probability of       19.52% 36.96% CONT01 No failures due to $1.2M   >$10M   31.32%   Expert   Not Cost- Cost will exceed benefit.
19.52% 36.96% CONT01 No failures due to containment overpressure
connected to                  containment over-                                containment                                  Panel    Beneficial primary/secondary              pressurization.                                  overpressure containment and maintained at a vacuum.
$1.2M
104   Improve leak detection         Increased piping             39.34% 2.17% LOCA05 No piping system   $689K   >$2M     1.03%   Expert   Not Cost- Cost will exceed benefit.
>$10M 31.32%
procedures.                    surveillance to identify                          LOCAs                                        Panel    Beneficial leaks prior to complete failure. Improved leak detection would reduce LOCA frequency.
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
107   Install a redundant           Increased containment       19.52% 36.96% CONT01 No failures due to $1.2M   >$2M   31.32%   Expert   Not Cost- Cost will exceed benefit.
100 Increase depth of the concrete base mat or use an alternate concrete material to ensure melt-through does not occur.
containment spray system.      heat removal ability.                            containment                                  Panel    Beneficial overpressure
Reduced probability of base mat melt-through.
MAB
>$10M Note 1 Expert Panel Not Cost-Beneficial Cost will exceed benefit.
102 Construct a building to be connected to primary/secondary containment and maintained at a vacuum.
Reduced probability of containment over-pressurization.
19.52% 36.96% CONT01 No failures due to containment overpressure
$1.2M  
>$10M 31.32%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
104 Improve leak detection procedures.
Increased piping surveillance to identify leaks prior to complete failure. Improved leak detection would reduce LOCA frequency.
39.34%
2.17%
LOCA05 No piping system LOCAs
$689K  
>$2M 1.03%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
107 Install a redundant containment spray system.
Increased containment heat removal ability.
19.52% 36.96% CONT01 No failures due to containment overpressure
$1.2M  
>$2M 31.32%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.  


ULNRC-05919 October 17, 2012 Enclosure 1                                                                                                  Page 13 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway                                                                 % Red.
ULNRC-05919 October 17, 2012 Page 13 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion
SAMA                                                              % Red. In OS SAMA       SAMA Case                       % Red IN Number        Potential Improvement              Discussion        In CDF  Dose    Case      Description    Benefit  Cost    OECR   Cost Basis Evaluation     Basis for Evaluation 108   Install an independent power   Reduced hydrogen            0.48% 0.00% H2BURN No hydrogen            $10K    >$100K    0.44%    Expert    Not Cost-supply to the hydrogen         detonation potential.                          burns/explosions                                  Panel    Beneficial control system using either new batteries, a non-safety grade portable generator, existing station batteries, or existing AC/DC independent power supplies, such as the security system diesel.
% Red.
109    Install a passive hydrogen    Reduced hydrogen           0.48% 0.00% H2BURN No hydrogen           $10K   >$100M    0.44%   Expert   Not Cost- Cost will exceed benefit.
In CDF
control system.               detonation potential.                           burns/explosions                                 Panel    Beneficial 110    Erect a barrier that would    Reduced probability of                    MAB                                >$10M    Note 1    Expert   Not Cost- Cost will exceed benefit.
% Red.
provide enhanced protection   containment failure.                                                                              Panel    Beneficial of the containment walls (shell) from ejected core debris following a core melt scenario at high pressure.
In OS Dose SAMA Case SAMA Case Description Benefit Cost
111   Install additional pressure or Reduced ISLOCA             1.33% 8.70% ISLOCA No ISLOCA events     $123K   >$500K   7.08%   Expert   Not Cost- Cost will exceed benefit.
% Red IN OECR Cost Basis Evaluation Basis for Evaluation 108 Install an independent power supply to the hydrogen control system using either new batteries, a non-safety grade portable generator, existing station batteries, or existing AC/DC independent power supplies, such as the security system diesel.
leak monitoring instruments    frequency.                                                                                        Panel    Beneficial for detection of ISLOCAs.
Reduced hydrogen detonation potential.
112   Add redundant and diverse     Reduced frequency of       0.30% 0.00% CONT02 No failures of         $1K     >$1M             Expert   Not Cost- Cost will exceed benefit.
0.48%
limit switches to each        containment isolation                          containment isolation                            Panel    Beneficial containment isolation valve. failure and ISLOCAs.
0.00%
113   Increase leak testing of       Reduced ISLOCA             1.33% 8.70% ISLOCA No ISLOCA events     $123K     >$1M     7.08%   Expert   Not Cost- Cost will exceed benefit.
H2BURN No hydrogen burns/explosions
valves in ISLOCA paths.        frequency.                                                                                        Panel    Beneficial 114   Install self-actuating         Reduced frequency of       0.30% 0.00% CONT02 No failures of         $1K   >$500K   0.03%   Expert   Not Cost- Cost will exceed benefit.
$10K  
containment isolation valves. isolation failure.                              containment isolation                            Panel    Beneficial 115   Locate residual heat removal   Reduced frequency of       1.33% 8.70% ISLOCA No ISLOCA events     $123K     >$1M     7.08%   Expert   Not Cost- Cost will exceed benefit.
>$100K 0.44%
(RHR) inside containment      ISLOCA outside                                                                                    Panel    Beneficial containment.
Expert Panel Not Cost-Beneficial 109 Install a passive hydrogen control system.
116   Ensure ISLOCA releases are Scrubbed ISLOCA                 1.33% 8.70% ISLOCA No ISLOCA events     $123K     >$1M     7.08%   Expert   Not Cost- Cost would exceed benefit.
Reduced hydrogen detonation potential.
scrubbed. One method is to releases.                                                                                            Panel    Beneficial Current plant design plug drains in potential break                                                                                                                        requires drains to be open.
0.48%
areas so that break point will                                                                                                                        Analysis and license be covered with water.                                                                                                                                changes required to implement are included in the cost estimate.
0.00%
119   Institute a maintenance       Reduced frequency of       20.47% 63.28% NOSGTR No SGTR Events       $1.4M     >$3M   69.43%   Expert   Not Cost- Cost will exceed benefit.
H2BURN No hydrogen burns/explosions  
practice to perform a 100%    steam generator tube                                                                             Panel    Beneficial inspection of steam            ruptures.
$10K
generator tubes during each refueling outage.
>$100M 0.44%
121    Increase the pressure          Eliminates release pathway 20.47% 63.28% NOSGTR No SGTR Events       $1.4M   >$10M   69.43%   Expert   Not Cost- Cost will exceed benefit.
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
capacity of the secondary      to the environment                                                                                Panel    Beneficial side so that a steam          following a steam generator tube rupture would  generator tube rupture.
110 Erect a barrier that would provide enhanced protection of the containment walls (shell) from ejected core debris following a core melt scenario at high pressure.
not cause the relief valves to lift.
Reduced probability of containment failure.
MAB
>$10M Note 1 Expert Panel Not Cost-Beneficial Cost will exceed benefit.
111 Install additional pressure or leak monitoring instruments for detection of ISLOCAs.
Reduced ISLOCA frequency.
1.33%
8.70%
ISLOCA No ISLOCA events  
$123K  
>$500K 7.08%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
112 Add redundant and diverse limit switches to each containment isolation valve.
Reduced frequency of containment isolation failure and ISLOCAs.
0.30%
0.00%
CONT02 No failures of containment isolation
$1K  
>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
113 Increase leak testing of valves in ISLOCA paths.
Reduced ISLOCA frequency.
1.33%
8.70%
ISLOCA No ISLOCA events  
$123K  
>$1M 7.08%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
114 Install self-actuating containment isolation valves.
Reduced frequency of isolation failure.
0.30%
0.00%
CONT02 No failures of containment isolation
$1K  
>$500K 0.03%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
115 Locate residual heat removal (RHR) inside containment Reduced frequency of ISLOCA outside containment.
1.33%
8.70%
ISLOCA No ISLOCA events  
$123K  
>$1M 7.08%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
116 Ensure ISLOCA releases are scrubbed. One method is to plug drains in potential break areas so that break point will be covered with water.
Scrubbed ISLOCA releases.
1.33%
8.70%
ISLOCA No ISLOCA events  
$123K  
>$1M 7.08%
Expert Panel Not Cost-Beneficial Cost would exceed benefit.
Current plant design requires drains to be open.
Analysis and license changes required to implement are included in the cost estimate.
119 Institute a maintenance practice to perform a 100%
inspection of steam generator tubes during each refueling outage.
Reduced frequency of steam generator tube ruptures.
20.47%
63.28% NOSGTR No SGTR Events  
$1.4M  
>$3M 69.43%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
121 Increase the pressure capacity of the secondary side so that a steam generator tube rupture would not cause the relief valves to lift.
Eliminates release pathway to the environment following a steam generator tube rupture.
20.47%
63.28% NOSGTR No SGTR Events  
$1.4M  
>$10M 69.43%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.  


ULNRC-05919 October 17, 2012 Enclosure 1                                                                                                  Page 14 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway                                                                   % Red.
ULNRC-05919 October 17, 2012 Page 14 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion
SAMA                                                              % Red. In OS   SAMA       SAMA Case                     % Red IN Number      Potential Improvement              Discussion        In CDF Dose    Case      Description    Benefit  Cost    OECR   Cost Basis Evaluation     Basis for Evaluation 122   Install a redundant spray     Enhanced depressurization 20.47% 63.28% NOSGTR No SGTR Events        $1.4M  >$10M    69.43%    Expert    Not Cost-  Cost will exceed benefit.
% Red.
system to depressurize the     capabilities during steam                                                                        Panel    Beneficial primary system during a       generator tube rupture.
In CDF
steam generator tube rupture 125    Route the discharge from the  Reduced consequences of    20.47% 63.28% NOSGTR No SGTR Events       $1.4M   >$10M   69.43%   Expert   Not Cost- Cost will exceed benefit.
% Red.
main steam safety valves       a steam generator tube                                                                          Panel    Beneficial through a structure where a   rupture.
In OS Dose SAMA Case SAMA Case Description Benefit Cost
water spray would condense the steam and remove most of the fission products.
% Red IN OECR Cost Basis Evaluation Basis for Evaluation 122 Install a redundant spray system to depressurize the primary system during a steam generator tube rupture Enhanced depressurization capabilities during steam generator tube rupture.
126    Install a highly reliable      Reduced consequences of     20.47% 63.28% NOSGTR No SGTR Events       $1.4M   >$10M   69.43%   Expert   Not Cost- Cost will exceed benefit.
20.47%
(closed loop) steam            a steam generator tube                                                                          Panel    Beneficial generator shell-side heat     rupture.
63.28% NOSGTR No SGTR Events  
removal system that relies on natural circulation and stored water sources 129    Vent main steam safety        Reduced consequences of     20.47% 63.28% NOSGTR No SGTR Events       $1.4M   >$10M   69.43%   Expert   Not Cost- Cost will exceed benefit.
$1.4M  
valves in containment.         a steam generator tube                                                                           Panel     Beneficial Current containment rupture.                                                                                                              design does not support this modification.
>$10M 69.43%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
125 Route the discharge from the main steam safety valves through a structure where a water spray would condense the steam and remove most of the fission products.
Reduced consequences of a steam generator tube rupture.
20.47%
63.28% NOSGTR No SGTR Events  
$1.4M  
>$10M 69.43%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
126 Install a highly reliable (closed loop) steam generator shell-side heat removal system that relies on natural circulation and stored water sources Reduced consequences of a steam generator tube rupture.
20.47%
63.28% NOSGTR No SGTR Events  
$1.4M  
>$10M 69.43%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
129 Vent main steam safety valves in containment.
Reduced consequences of a steam generator tube rupture.
20.47%
63.28% NOSGTR No SGTR Events
$1.4M
>$10M 69.43%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
Current containment design does not support this modification.
Modifications to containment and associated analysis are included in the cost estimate.
Modifications to containment and associated analysis are included in the cost estimate.
130   Add an independent boron       Improved availability of     2.41% 2.17% NOATWS Eliminate all ATWS   $63K   >$1M     1.85%   Expert   Not Cost- Cost will exceed benefit.
130 Add an independent boron injection system.
injection system.              boron injection during                                                                          Panel    Beneficial ATWS.
Improved availability of boron injection during ATWS.
131   Add a system of relief valves Improved equipment           2.41% 2.17% NOATWS Eliminate all ATWS   $63K   >$2M     1.85%   Expert   Not Cost- Cost will exceed benefit.
2.41%
to prevent equipment          availability after an ATWS.                                                                      Panel    Beneficial damage from pressure spikes during an ATWS.
2.17%
133   Install an ATWS sized filtered Increased ability to remove 2.41% 2.17% NOATWS Eliminate all ATWS   $63K   >$1M     1.85%   Expert   Not Cost- Cost will exceed benefit containment vent to remove    reactor heat from ATWS                                                                          Panel    Beneficial decay heat.                    events.
NOATWS Eliminate all ATWS  
136   Install motor generator set   Reduced frequency of core   2.41% 2.17% NOATWS Eliminate all ATWS   $63K   >$500K   1.85%   Expert   Not Cost- Cost will exceed benefit.
$63K  
trip breakers in control room. damage due to an ATWS.                                                                          Panel    Beneficial 147   Install digital large break   Reduced probability of a   39.34% 2.17% LOCA05 No piping system     $689K   >$5M     1.03%   Expert   Not Cost- Cost will exceed benefit.
>$1M 1.85%
LOCA protection system.        large break LOCA (a leak                        LOCAs                                          Panel    Beneficial before break).
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
153   Install secondary side guard   Prevents secondary side      2.53% 0.00%  NOSLB No Steam Line Breaks  $51K    >$1M    0.87%    Expert    Not Cost-  Cost will exceed benefit.
131 Add a system of relief valves to prevent equipment damage from pressure spikes during an ATWS.
pipes up to the main steam     depressurization should a                                                                       Panel    Beneficial isolation valves.              steam line break occur upstream of the main steam isolation valves.
Improved equipment availability after an ATWS.
2.41%
2.17%
NOATWS Eliminate all ATWS  
$63K  
>$2M 1.85%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
133 Install an ATWS sized filtered containment vent to remove decay heat.
Increased ability to remove reactor heat from ATWS events.
2.41%
2.17%
NOATWS Eliminate all ATWS  
$63K  
>$1M 1.85%
Expert Panel Not Cost-Beneficial Cost will exceed benefit 136 Install motor generator set trip breakers in control room.
Reduced frequency of core damage due to an ATWS.
2.41%
2.17%
NOATWS Eliminate all ATWS  
$63K  
>$500K 1.85%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
147 Install digital large break LOCA protection system.
Reduced probability of a large break LOCA (a leak before break).
39.34%
2.17%
LOCA05 No piping system LOCAs
$689K  
>$5M 1.03%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
153 Install secondary side guard pipes up to the main steam isolation valves.
Prevents secondary side depressurization should a steam line break occur upstream of the main steam isolation valves.
Also guards against or prevents consequential multiple steam generator tube ruptures following a main steam line break event.
Also guards against or prevents consequential multiple steam generator tube ruptures following a main steam line break event.
2.53%
0.00%
NOSLB No Steam Line Breaks
$51K
>$1M 0.87%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.


ULNRC-05919 October 17, 2012 Enclosure 1                                                                                                      Page 15 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway                                                                     % Red.
ULNRC-05919 October 17, 2012 Page 15 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion
SAMA                                                                  % Red. In OS   SAMA       SAMA Case                       % Red IN Number      Potential Improvement                Discussion          In CDF Dose    Case        Description    Benefit  Cost  OECR   Cost Basis Evaluation     Basis for Evaluation 160   Modifications to lessen         Lower impact of flood that                                                         <$50K             Expert   Potentially Relatively minor impact of internal flooding    propagates through the                                                                              Panel      Cost-    modifications to door path through Control Building dumbwaiter                                                                                                      Beneficial opening could result in dumbwaiter.                                                                                                                                              lower flow to the dumbwaiter. Specific benefit could not be calculated but SAMA item is judged to be low cost and therefore potentially cost beneficial.
% Red.
161   Improvements to PORV           Decrease in risk due to       0.85% 0.46%   PORV PORVs do not fail to   $18K   >$100K   0.24%     Expert   Not Cost- Cost will exceed benefit.
In CDF
performance that will lower    PORV failing to open.                              open                                            Panel    Beneficial the probability of failure to open.
% Red.
162   Install a large volume EDG     Allows transfer of EDF fuel   1.14% 7.60% EDGFUEL No EDG fuel pump     $124K   $150K   7.11%   Wolf Creek Potentially Wolf Creek estimated cost fuel oil tank at an elevation  oil to the EDG day tanks on                        failures                                                    Cost-    of $150K is less than the greater than the EDG fuel oil  failure of the fuel oil                                                                                        Beneficial potential benefit.
In OS Dose SAMA Case SAMA Case Description Benefit Cost
day tanks.                      transfer pumps.
% Red IN OECR Cost Basis Evaluation Basis for Evaluation 160 Modifications to lessen impact of internal flooding path through Control Building dumbwaiter.
163   Improve feedwater check         Lower risk due to failures in 5.52% 2.05%   FW02 Feedwater Check       $127K   >$500K   2.23%     Expert   Not Cost- Cost will exceed benefit.
Lower impact of flood that propagates through the dumbwaiter
valve reliability to reduce    which feedwater check                              Valves do not fail to                            Panel    Beneficial probability of failure to open. valves fail to open and                            open allow feeding of the steam generators.
<$50K Expert Panel Potentially Cost-Beneficial Relatively minor modifications to door opening could result in lower flow to the dumbwaiter. Specific benefit could not be calculated but SAMA item is judged to be low cost and therefore potentially cost beneficial.
164   Provide the capability to       Provide backup to ESW in       5.62% 7.64%   SW03 AEPS power to SW     $191K   >$500K   6.37%     Expert   Not Cost- Cost will exceed benefit.
161 Improvements to PORV performance that will lower the probability of failure to open.
power the normal service        conditions with power only                          pumps                                            Panel    Beneficial water pumps from AEPS.          available from AEPS.
Decrease in risk due to PORV failing to open.
171   Increase the size of the       Ensure a supply of makeup     0.68% 0.13%   LOCA04 RWST does not         $13K   >$100K   0.07%     Expert   Not Cost- Cost will exceed benefit.
0.85%
RWST or otherwise improve      water is available from the                        deplete                                          Panel    Beneficial the availability of the RWST    RWST.
0.46%
178   Improvements to UHS             Improve availability or       3.29% 4.75%   HVAC02 UHS cooling tower     $113K   <$100K   3.82%     Expert   Potentially Implementation of cooling tower electrical room  mitigate loss of HVAC.                %            electrical room HVAC                            Panel      Cost    temporary ventilation or HVAC.                                                                              does not fail.                                            Beneficial opening of doors will be a lower cost than the calculated benefit.
PORV PORVs do not fail to open
179   Modify procedures such that     Prevents possible thermally   0.15% 3.18%   RAI7a Reduced probability   $63K   <$100K   4.46%     Expert   Potentially Implementation of the water loop seals in the    induced steam generator                            of thermally induced                            Panel      Cost    procedure change will be RCS cold legs are not          tube rupture following core                        steam generator tube                                      Beneficial lower cost than benefit, cleared following core          damage.                                            failure                                                              especially if 95% CDF damage.                                                                                                                                                  benefit is considered.
$18K  
180   Install lower amperage fuses   Reduced fire risk.                                                                                            Potentially SAMA considered for various 14 AWG control                                                                                                                       Cost    potentially cost beneficial circuits in the MCR. The                                                                                                                       Beneficial without benefit or cost majority of the modification                                                                                                                             determination since the centers around the trip circuit                                                                                                                           NFPA 805 license fuses on NB, NG, PA, PB,                                                                                                                                 amendment request and PG system breakers.                                                                                                                                   committed to performing the modification.
>$100K 0.24%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
162 Install a large volume EDG fuel oil tank at an elevation greater than the EDG fuel oil day tanks.
Allows transfer of EDF fuel oil to the EDG day tanks on failure of the fuel oil transfer pumps.
1.14%
7.60%
EDGFUEL No EDG fuel pump failures
$124K  
$150K 7.11%
Wolf Creek Potentially Cost-Beneficial Wolf Creek estimated cost of $150K is less than the potential benefit.
163 Improve feedwater check valve reliability to reduce probability of failure to open.
Lower risk due to failures in which feedwater check valves fail to open and allow feeding of the steam generators.
5.52%
2.05%
FW02 Feedwater Check Valves do not fail to open
$127K  
>$500K 2.23%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
164 Provide the capability to power the normal service water pumps from AEPS.
Provide backup to ESW in conditions with power only available from AEPS.
5.62%
7.64%
SW03 AEPS power to SW pumps
$191K  
>$500K 6.37%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
171 Increase the size of the RWST or otherwise improve the availability of the RWST Ensure a supply of makeup water is available from the RWST.
0.68%
0.13%
LOCA04 RWST does not deplete
$13K  
>$100K 0.07%
Expert Panel Not Cost-Beneficial Cost will exceed benefit.
178 Improvements to UHS cooling tower electrical room HVAC.
Improve availability or mitigate loss of HVAC.
3.29%
4.75%
HVAC02 UHS cooling tower electrical room HVAC does not fail.
$113K  
<$100K 3.82%
Expert Panel Potentially Cost Beneficial Implementation of temporary ventilation or opening of doors will be a lower cost than the calculated benefit.
179 Modify procedures such that the water loop seals in the RCS cold legs are not cleared following core damage.
Prevents possible thermally induced steam generator tube rupture following core damage.
0.15%
3.18%
RAI7a Reduced probability of thermally induced steam generator tube failure
$63K  
<$100K 4.46%
Expert Panel Potentially Cost Beneficial Implementation of procedure change will be lower cost than benefit, especially if 95% CDF benefit is considered.
180 Install lower amperage fuses for various 14 AWG control circuits in the MCR. The majority of the modification centers around the trip circuit fuses on NB, NG, PA, PB, and PG system breakers.
Reduced fire risk.
Potentially Cost Beneficial SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.  


ULNRC-05919 October 17, 2012 Enclosure 1                                                                                                    Page 16 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway                                                                 % Red.
ULNRC-05919 October 17, 2012 Page 16 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion
SAMA                                                              % Red. In OS SAMA     SAMA Case                           % Red IN Number      Potential Improvement                Discussion        In CDF Dose    Case      Description        Benefit  Cost    OECR   Cost Basis Evaluation     Basis for Evaluation 181   Install redundant fuses and   Reduced fire risk.                                                                                           Potentially SAMA considered isolation switches for MCR                                                                                                                    Cost    potentially cost beneficial evacuation procedure OTO-                                                                                                                  Beneficial  without benefit or cost ZZ-00001.                                                                                                                                              determination since the NFPA 805 license amendment request committed to performing the modification.
% Red.
182   To protect against multiple   Reduced fire risk.                                                                                            Potentially SAMA considered spurious operation scenarios,                                                                                                                 Cost    potentially cost beneficial cable runs will be changed to                                                                                                               Beneficial  without benefit or cost run a single wire in a                                                                                                                                 determination since the protected metal jacket such                                                                                                                             NFPA 805 license that spurious valve opening                                                                                                                             amendment request due to a hot short affecting                                                                                                                           committed to performing the valve control circuit is                                                                                                                           the modification.
In CDF
eliminated for the fire area.
% Red.
In OS Dose SAMA Case SAMA Case Description Benefit Cost
% Red IN OECR Cost Basis Evaluation Basis for Evaluation 181 Install redundant fuses and isolation switches for MCR evacuation procedure OTO-ZZ-00001.
Reduced fire risk.
Potentially Cost Beneficial SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.
182 To protect against multiple spurious operation scenarios, cable runs will be changed to run a single wire in a protected metal jacket such that spurious valve opening due to a hot short affecting the valve control circuit is eliminated for the fire area.
This modification will be implemented in multiple fire areas.
This modification will be implemented in multiple fire areas.
183    Quick response sprinkler      Reduced fire risk.                                                                                           Potentially SAMA considered heads in cable chases A-11,                                                                                                                   Cost    potentially cost beneficial C-30, and C-31 will be                                                                                                                     Beneficial  without benefit or cost modified to be in accordance                                                                                                                           determination since the with the applicable                                                                                                                                     NFPA 805 license requirements of NFPA 13-                                                                                                                               amendment request 1976 edition.                                                                                                                                           committed to performing the modification.
Reduced fire risk.
184   Improvements in the           More reliable main steam     0.59% 0.95%   SLIS Steam Line Isolation     $28K   >$500K   1.06%   Expert   Not Cost-   Cost is for installation of reliability of the Steam Line line isolation.                                  System does not fail                                Panel    Beneficial  redundant instrumentation Isolation automatic signal.                                                                                                                            system and would likely be much higher. Procedure and training already direct operators to manually back up failed automatic actuations.
Potentially Cost Beneficial SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.
185   Automate initiation of CCW   More reliable than manual   3.53% 0.14%   HEP Evaluate automating       $62K   $200K   0.11%   Expert   Potentially flow to the RHR heat          initiation of flow to RHR                        CCW flow to RHR                                    Panel      Cost exchangers.                  HX.                                              HXs                                                          Beneficial 186   Develop a procedure and       Backup cooling water if     0.04% 0.05% FWCCW Fire water available to   $1K   >$1M   0.04%   Expert   Not Cost-   Ability to do this will require obtain equipment to provide  ESW/SW is lost                                  cool CCW HX                                        Panel    Beneficial  larger fire pumps.
183 Quick response sprinkler heads in cable chases A-11, C-30, and C-31 will be modified to be in accordance with the applicable requirements of NFPA 13-1976 edition.
a temporary hookup of fire water as a replacement for ESW 187   Install modification to power Another source of backup     4.07% 7.63% SBOMOD Reduce the frequency     $174K   $350K   7.03%   Expert   Potentially Already installed spare the normal charging pump      power to the NCP in cases                        of SBO sequences.                                  Panel      Cost    circuit breaker, from an existing spare        of station blackout or loss                                                                                  Beneficial  implementation requires breaker from the AEPS.        of service water                                                                                                          power and control cables.
Reduced fire risk.
Potentially Cost Beneficial SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.
184 Improvements in the reliability of the Steam Line Isolation automatic signal.
More reliable main steam line isolation.
0.59%
0.95%
SLIS Steam Line Isolation System does not fail
$28K  
>$500K 1.06%
Expert Panel Not Cost-Beneficial Cost is for installation of redundant instrumentation system and would likely be much higher. Procedure and training already direct operators to manually back up failed automatic actuations.
185 Automate initiation of CCW flow to the RHR heat exchangers.
More reliable than manual initiation of flow to RHR HX.
3.53%
0.14%
HEP Evaluate automating CCW flow to RHR HXs
$62K  
$200K 0.11%
Expert Panel Potentially Cost Beneficial 186 Develop a procedure and obtain equipment to provide a temporary hookup of fire water as a replacement for ESW Backup cooling water if ESW/SW is lost 0.04%
0.05%
FWCCW Fire water available to cool CCW HX
$1K  
>$1M 0.04%
Expert Panel Not Cost-Beneficial Ability to do this will require larger fire pumps.
187 Install modification to power the normal charging pump from an existing spare breaker from the AEPS.
Another source of backup power to the NCP in cases of station blackout or loss of service water 4.07%
7.63%
SBOMOD Reduce the frequency of SBO sequences.
$174K  
$350K 7.03%
Expert Panel Potentially Cost Beneficial Already installed spare circuit breaker, implementation requires power and control cables.  


ULNRC-05919 October 17, 2012 Enclosure 1                                                                                                Page 17 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway                                                                 % Red.
ULNRC-05919 October 17, 2012 Page 17 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion
SAMA                                                            % Red. In OS   SAMA     SAMA Case                       % Red IN Number      Potential Improvement            Discussion          In CDF Dose    Case      Description      Benefit Cost    OECR   Cost Basis Evaluation     Basis for Evaluation 188   Install a permanent,       Another source of backup     4.28% 7.63% SBOMOD2 Reduce the frequency $182K $400K   7.38%   Expert   Potentially AEPS was installed with a dedicated generator for the power to the NCP, DC                              of SBO sequences.                              Panel      Cost    spare breaker and NCP, and a motor-driven    power (pump/valve control                                                                                  Beneficial  expansion capability that AFW pump and battery        and SG level                                                                                                            could be used to supply charger to address SBO      instrumentation), and                                                                                                  various equipment.
% Red.
events in which the TD AFW  power to an AFW pump in pump is unavailable.        cases of station blackout or loss of service water OS = off site Note 1: For SAMA items that were judged to cost significantly more than the Maximum Attainable Benefit (MAB), no calculation of the individual benefit was performed.
In CDF
% Red.
In OS Dose SAMA Case SAMA Case Description Benefit Cost
% Red IN OECR Cost Basis Evaluation Basis for Evaluation 188 Install a permanent, dedicated generator for the NCP, and a motor-driven AFW pump and battery charger to address SBO events in which the TD AFW pump is unavailable.
Another source of backup power to the NCP, DC power (pump/valve control and SG level instrumentation), and power to an AFW pump in cases of station blackout or loss of service water 4.28%
7.63%
SBOMOD2 Reduce the frequency of SBO sequences.
$182K  
$400K 7.38%
Expert Panel Potentially Cost Beneficial AEPS was installed with a spare breaker and expansion capability that could be used to supply various equipment.
OS = off site Note 1: For SAMA items that were judged to cost significantly more than the Maximum Attainable Benefit (MAB), no calculation of the individual benefit was performed.  


ULNRC-05919 October 17, 2012 Enclosure 1                                                                                                              Page 18 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway                                                                                           Benefit at Benefit at         Benefit SAMA                                                                                SAMA          3% Disc   Realistic Benefit at 95%
ULNRC-05919 October 17, 2012 Page 18 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway SAMA Number Potential Improvement Discussion SAMA Case Benefit Benefit at 3% Disc Rate Benefit at Realistic Disc Rate Benefit at 33yrs Benefit at 95%
Number            Potential Improvement                  Discussion                Case Benefit    Rate    Disc Rate  at 33yrs  CDF     Cost Cost Basis   Evaluation     Basis for Evaluation 1   Provide additional DC battery         Extended DC power availability     NOSBO $360K   $588K     $325K     $512K   $761K   >$1M Expert Panel   Not Cost-     Cost will exceed capacity.                              during an SBO.                                                                                                  Beneficial    benefit.
CDF Cost Cost Basis Evaluation Basis for Evaluation 1
2   Replace lead-acid batteries with fuel Extended DC power availability     NOSBO $360K   $588K     $325K     $512K   $761K   >$1M Expert Panel   Not Cost-     Cost will exceed cells.                                during an SBO.                                                                                                  Beneficial    benefit.
Provide additional DC battery capacity.
5   Provide DC bus cross-ties.             Improved availability of DC           DC01   $1K     $1K       $1K       $1K     $1K   >$199K Expert Panel   Not Cost-     Cost will exceed power system.                                                                                                  Beneficial    benefit.
Extended DC power availability during an SBO.
11   Improve 4.16-kV bus cross-tie ability. Increased availability of on-site     4kv2 $13K     $20K       $12K     $17K     $27K   <$100K Expert Panel   Potentially   Physical cross-tie AC power.                                                                                                    Cost-Beneficial exists, but there is no analysis or procedures to allow its use except in specific outage conditions. Cost is to develop procedures and analysis to allow use of the cross-tie.
NOSBO  
$360K  
$588K  
$325K  
$512K  
$761K  
>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
2 Replace lead-acid batteries with fuel cells.
Extended DC power availability during an SBO.
NOSBO  
$360K  
$588K  
$325K  
$512K  
$761K  
>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
5 Provide DC bus cross-ties.
Improved availability of DC power system.
DC01  
$1K  
$1K  
$1K  
$1K  
$1K  
>$199K Expert Panel Not Cost-Beneficial Cost will exceed benefit.
11 Improve 4.16-kV bus cross-tie ability. Increased availability of on-site AC power.
4kv2  
$13K  
$20K  
$12K  
$17K  
$27K  
<$100K Expert Panel Potentially Cost-Beneficial Physical cross-tie exists, but there is no analysis or procedures to allow its use except in specific outage conditions. Cost is to develop procedures and analysis to allow use of the cross-tie.
Benefit calculated is under-estimated since it was evaluated for only SBO sequences.
Benefit calculated is under-estimated since it was evaluated for only SBO sequences.
15   Install tornado protection on gas     Increased availability of on-site   LOSP1 $91K   $144K       $82K     $125K   $192K   >$500K Expert Panel   Not Cost-     Cost will exceed turbine generator.                    AC power.                                                                                                      Beneficial    benefit.
15 Install tornado protection on gas turbine generator.
24   Bury off-site power lines.             Improved off-site power reliability NOLOSP $1.2M     $2.0M     $1.1M     $1.7M   $2.6M   >$3M Expert Panel   Not Cost-     Cost will exceed during severe weather.                                                                                          Beneficial    benefit. Previous SAMA submittals have estimated approximately $1M per mile.
Increased availability of on-site AC power.
25   Install an independent active or       Improved prevention of core melt   LOCA12 $48K     $85K       $44K       $75     $102   >$1M Expert Panel   Not Cost-     Cost will exceed passive high pressure injection        sequences.                                                                                                      Beneficial    benefit.
LOSP1  
system.
$91K  
26   Provide an additional high pressure   Reduced frequency of core melt     LOCA12 $48K     $85K       $44K       $75     $102   >$1M Expert Panel   Not Cost-     Cost will exceed injection pump with independent        from small LOCA and SBO                                                                                        Beneficial    benefit.
$144K  
diesel.                                sequences.
$82K  
28   Add a diverse low pressure injection   Improved injection capability.     LOCA03 $65K   $111K       $58K     $97K   $137K   >$1M Expert Panel   Not Cost-     Cost will exceed system.                                                                                                                                                Beneficial    benefit.
$125K  
29   Provide capability for alternate       Improved injection capability.                                                                                  Potentially  SAMA is judged to be injection via diesel-driven fire pump.                                                                                                               Cost-Beneficial low cost, but analysis is needed to determine impacts of injection of non-borated water to RCS.
$192K  
Expert Panel judged this SAMA to be potentially cost-beneficial without determining an actual benefit or cost.
>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.
24 Bury off-site power lines.
Improved off-site power reliability during severe weather.
NOLOSP  
$1.2M  
$2.0M  
$1.1M  
$1.7M  
$2.6M  
>$3M Expert Panel Not Cost-Beneficial Cost will exceed benefit. Previous SAMA submittals have estimated approximately $1M per mile.
25 Install an independent active or passive high pressure injection system.
Improved prevention of core melt sequences.
LOCA12  
$48K  
$85K  
$44K  
$75  
$102  
>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
26 Provide an additional high pressure injection pump with independent diesel.
Reduced frequency of core melt from small LOCA and SBO sequences.
LOCA12  
$48K  
$85K  
$44K  
$75  
$102  
>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
28 Add a diverse low pressure injection system.
Improved injection capability.
LOCA03  
$65K  
$111K  
$58K  
$97K  
$137K  
>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
29 Provide capability for alternate injection via diesel-driven fire pump.
Improved injection capability.
Potentially Cost-Beneficial SAMA is judged to be low cost, but analysis is needed to determine impacts of injection of non-borated water to RCS.
Expert Panel judged this SAMA to be potentially cost-beneficial without determining an actual benefit or cost.  


ULNRC-05919 October 17, 2012 Enclosure 1                                                                                                              Page 19 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway                                                                                           Benefit at Benefit at         Benefit SAMA                                                                                SAMA          3% Disc   Realistic Benefit at 95%
ULNRC-05919 October 17, 2012 Page 19 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway SAMA Number Potential Improvement Discussion SAMA Case Benefit Benefit at 3% Disc Rate Benefit at Realistic Disc Rate Benefit at 33yrs Benefit at 95%
Number            Potential Improvement                      Discussion              Case Benefit  Rate    Disc Rate  at 33yrs  CDF     Cost Cost Basis   Evaluation       Basis for Evaluation 39   Replace two of the four electric safety Reduced common cause failure        LOCA12  $48K    $85K      $44K      $75    $102    >$1M  Expert Panel    Not Cost-    Cost will exceed injection pumps with diesel-powered of the safety injection system.                                                                                    Beneficial    benefit.
CDF Cost Cost Basis Evaluation Basis for Evaluation 39 Replace two of the four electric safety injection pumps with diesel-powered pumps.
pumps.                                  This SAMA was originally intended for the Westinghouse-CE System 80+, which has four trains of safety injection.
Reduced common cause failure of the safety injection system.
However, the intent of this SAMA is to provide diversity within the high- and l 41    Create a reactor coolant                Allows low pressure emergency DEPRESS      $12K    $20K      $11K      $17K    $25K  >$500K Expert Panel   Not Cost-     Cost will exceed depressurization system.               core cooling system injection in                                                                               Beneficial    benefit.
This SAMA was originally intended for the Westinghouse-CE System 80+, which has four trains of safety injection.
the event of small LOCA and high-pressure safety injection failure.
However, the intent of this SAMA is to provide diversity within the high-and l LOCA12
43   Add redundant DC control power for Increased availability of SW.             SW01   $1K     $2K       $1K       $2K     $3K   >$100K Expert Panel   Not Cost-     Cost will exceed SW pumps.                                                                                                                                              Beneficial    benefit.
$48K
46   Add a service water pump.               Increased availability of cooling   SW02 $636K     $1M       $575K     $879K   $1.3M   >$5M Expert Panel   Not Cost-     Cost will exceed water.                                                                                                          Beneficial    benefit.
$85K
54   Increase charging pump lube oil         Increased time before charging     CHG01   $4K     $7K       $4K       $6K     $9K   >$100K Expert Panel   Not Cost-     Cost will exceed capacity.                              pump failure due to lube oil                                                                                    Beneficial    benefit.
$44K
overheating in loss of cooling water sequences.
$75
55   Install an independent reactor coolant Reduced frequency of core           RCPLOCA $94K   $168K       $85K     $148K   $198K   >$1M Expert Panel   Not Cost-     Cost will exceed pump seal injection system, with        damage from loss of component                                                                                  Beneficial    benefit. Previous dedicated diesel.                      cooling water, service water, or                                                                                              investigation into station blackout.                                                                                                              installing such a system concluded that operators did not have sufficient time to place the system in service prior to seal damage.
$102
56   Install an independent reactor coolant Reduced frequency of core           RCPLOCA $94K   $168K       $85K     $148K   $198K   >$500K Expert Panel   Not Cost-     Cost will exceed pump seal injection system, without    damage from loss of component                                                                                  Beneficial    benefit.
>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
dedicated diesel.                      cooling water or service water, but not a station blackout.
41 Create a reactor coolant depressurization system.
58   Install improved reactor coolant pump Reduced likelihood of reactor       RCPLOCA $94K   $168K       $85K     $148K   $198K   >$3M                 Not Cost-     Cost will exceed seals.                                  coolant pump seal LOCA.                                                                                        Beneficial    benefit.
Allows low pressure emergency core cooling system injection in the event of small LOCA and high-pressure safety injection failure.
59   Install an additional component         Reduced likelihood of loss of       CCW01   $59K   $106K       $53K     $93K   $124K   >$1M   Cost will     Not Cost-     Cost will exceed cooling water pump.                    component cooling water leading                                                                    exceed      Beneficial    benefit.
DEPRESS
to a reactor coolant pump seal                                                                    benefit LOCA.
$12K
64   Implement procedure and hardware       Improved ability to cool residual FWCCW2 $104K   $184K       $94K     $161K   $220K   <$150K Expert Panel Potentially Cost The cost estimate is modifications to allow manual          heat removal heat exchangers.                                                                                  Beneficial    for development of a alignment of the fire water system to                                                                                                                                  procedure and use of the component cooling water system,                                                                                                                                    temporary or install a component cooling water                                                                                                                                  connections. Cost of header cross-tie.                                                                                                                                                      permanent modification would be significantly higher.
$20K
$11K
$17K
$25K
>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.
43 Add redundant DC control power for SW pumps.
Increased availability of SW.
SW01  
$1K  
$2K  
$1K  
$2K  
$3K  
>$100K Expert Panel Not Cost-Beneficial Cost will exceed benefit.
46 Add a service water pump.
Increased availability of cooling water.
SW02  
$636K  
$1M  
$575K  
$879K  
$1.3M  
>$5M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
54 Increase charging pump lube oil capacity.
Increased time before charging pump failure due to lube oil overheating in loss of cooling water sequences.
CHG01  
$4K  
$7K  
$4K  
$6K  
$9K  
>$100K Expert Panel Not Cost-Beneficial Cost will exceed benefit.
55 Install an independent reactor coolant pump seal injection system, with dedicated diesel.
Reduced frequency of core damage from loss of component cooling water, service water, or station blackout.
RCPLOCA  
$94K  
$168K  
$85K  
$148K  
$198K  
>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit. Previous investigation into installing such a system concluded that operators did not have sufficient time to place the system in service prior to seal damage.
56 Install an independent reactor coolant pump seal injection system, without dedicated diesel.
Reduced frequency of core damage from loss of component cooling water or service water, but not a station blackout.
RCPLOCA  
$94K  
$168K  
$85K  
$148K  
$198K  
>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.
58 Install improved reactor coolant pump seals.
Reduced likelihood of reactor coolant pump seal LOCA.
RCPLOCA  
$94K  
$168K  
$85K  
$148K  
$198K  
>$3M Not Cost-Beneficial Cost will exceed benefit.
59 Install an additional component cooling water pump.
Reduced likelihood of loss of component cooling water leading to a reactor coolant pump seal LOCA.
CCW01  
$59K  
$106K  
$53K  
$93K  
$124K  
>$1M Cost will exceed benefit Not Cost-Beneficial Cost will exceed benefit.
64 Implement procedure and hardware modifications to allow manual alignment of the fire water system to the component cooling water system, or install a component cooling water header cross-tie.
Improved ability to cool residual heat removal heat exchangers.
FWCCW2  
$104K  
$184K  
$94K  
$161K  
$220K  
<$150K Expert Panel Potentially Cost Beneficial The cost estimate is for development of a procedure and use of temporary connections. Cost of permanent modification would be significantly higher.  


ULNRC-05919 October 17, 2012 Enclosure 1                                                                                                              Page 20 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway                                                                                           Benefit at Benefit at         Benefit SAMA                                                                                SAMA          3% Disc   Realistic Benefit at 95%
ULNRC-05919 October 17, 2012 Page 20 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway SAMA Number Potential Improvement Discussion SAMA Case Benefit Benefit at 3% Disc Rate Benefit at Realistic Disc Rate Benefit at 33yrs Benefit at 95%
Number            Potential Improvement                    Discussion              Case Benefit    Rate    Disc Rate  at 33yrs  CDF     Cost Cost Basis   Evaluation       Basis for Evaluation 65   Install a digital feed water upgrade. Reduced chance of loss of main       FW01   $29K     $50K     $27K       $44K     $62K   $19M   Callaway     Not Cost-     Cost will exceed feed water following a plant trip.                                                                Modification  Beneficial    benefit.
CDF Cost Cost Basis Evaluation Basis for Evaluation 65 Install a digital feed water upgrade.
Costs 71   Install a new condensate storage       Increased availability of the       CST01   $18K     $32K       $16K     $28K     $39K   >$2.5M Expert Panel   Not Cost-     Cost will exceed tank (auxiliary feedwater storage      auxiliary feedwater system.                                                                                    Beneficial    benefit.
Reduced chance of loss of main feed water following a plant trip.
tank).
FW01  
77   Provide a passive, secondary-side     Reduced potential for core           FW01   $29K     $50K       $27K     $44K     $62K   $>1M Expert Panel   Not Cost-     Cost will exceed heat-rejection loop consisting of a    damage due to loss-of-feedwater                                                                                Beneficial    benefit.
$29K  
condenser and heat sink.              events.
$50K  
79   Replace existing pilot-operated relief Increased probability of             FB01   $79K   $133K       $72K     $117K   $168K   >$500K Expert Panel   Not Cost-     Cost will exceed valves with larger ones, such that    successful feed and bleed.                                                                                      Beneficial    benefit.
$27K  
only one is required for successful feed and bleed.
$44K  
80   Provide a redundant train or means     Increased availability of           HVAC   $156K   $259K     $141K     $227K   $331K   <$100K Expert Panel Potentially Cost Procedures to open of ventilation.                        components dependent on room                                                                                    Beneficial    doors or provide cooling.                                                                                                                      temporary ventilation may be cost beneficial for the EDGs, MDAFW pumps, and charging pumps. Procedures for opening doors to the DC switchgear rooms exist.
$62K  
87   Replace service and instrument air     Elimination of instrument air     INSTAIR   $2K     $3K       $2K     $$2K     $4K   >$500K Expert Panel   Not Cost-     Cost will exceed compressors with more reliable        system dependence on service                                                                                    Beneficial    benefit.
$19M Callaway Modification Costs Not Cost-Beneficial Cost will exceed benefit.
compressors which have self-          water cooling.
71 Install a new condensate storage tank (auxiliary feedwater storage tank).
contained air cooling by shaft driven fans.
Increased availability of the auxiliary feedwater system.
91   Install a passive containment spray   Improved containment spray         CONT01 $793K     $1.2M     $717K     $1.1M   $1.7M   >$10M Expert Panel   Not Cost-     Cost will exceed system.                                capability.                                                                                                    Beneficial    benefit.
CST01  
93   Install an unfiltered, hardened       Increased decay heat removal       CONT01 $793K     $1.2M     $717K     $1.1M   $1.7M   >$2M Expert Panel   Not Cost-     Cost will exceed containment vent.                     capability for non-ATWS events,                                                                                 Beneficial    benefit.
$18K  
without scrubbing released fission products.
$32K  
94    Install a filtered containment vent to Increased decay heat removal      CONT01 $793K     $1.2M     $717K     $1.1M   $1.7M   >$2M Expert Panel   Not Cost-     Cost will exceed remove decay heat. Option 1: Gravel capability for non-ATWS events,                                                                                    Beneficial    benefit.
$16K  
Bed Filter; Option 2: Multiple Venturi with scrubbing of released fission Scrubber                              products.
$28K  
96   Provide post-accident containment     Reduced likelihood of hydrogen     H2BURN   $10K     $15K       $9K     $13K     $20K   >$100K Expert Panel   Not Cost-     Cost will exceed inerting capability.                  and carbon monoxide gas                                                                                        Beneficial    benefit.
$39K  
combustion.
>$2.5M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
97   Create a large concrete crucible with Increased cooling and                MAB                                                  >$10M  Expert Panel    Not Cost-    Cost will exceed heat removal potential to contain     containment of molten core                                                                                     Beneficial    benefit.
77 Provide a passive, secondary-side heat-rejection loop consisting of a condenser and heat sink.
molten core debris.                    debris. Molten core debris escaping from the vessel is contained within the crucible and a water cooling mechanism cools the molten core in the crucible, preventing melt-through of the base mat.
Reduced potential for core damage due to loss-of-feedwater events.
FW01  
$29K  
$50K  
$27K  
$44K  
$62K  
$>1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
79 Replace existing pilot-operated relief valves with larger ones, such that only one is required for successful feed and bleed.
Increased probability of successful feed and bleed.
FB01  
$79K  
$133K  
$72K  
$117K  
$168K  
>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.
80 Provide a redundant train or means of ventilation.
Increased availability of components dependent on room cooling.
HVAC  
$156K  
$259K  
$141K  
$227K  
$331K  
<$100K Expert Panel Potentially Cost Beneficial Procedures to open doors or provide temporary ventilation may be cost beneficial for the EDGs, MDAFW pumps, and charging pumps. Procedures for opening doors to the DC switchgear rooms exist.
87 Replace service and instrument air compressors with more reliable compressors which have self-contained air cooling by shaft driven fans.
Elimination of instrument air system dependence on service water cooling.
INSTAIR  
$2K  
$3K  
$2K  
$$2K  
$4K  
>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.
91 Install a passive containment spray system.
Improved containment spray capability.
CONT01  
$793K  
$1.2M  
$717K  
$1.1M  
$1.7M  
>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
93 Install an unfiltered, hardened containment vent.
Increased decay heat removal capability for non-ATWS events, without scrubbing released fission products.
CONT01  
$793K  
$1.2M  
$717K  
$1.1M  
$1.7M  
>$2M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
94 Install a filtered containment vent to remove decay heat. Option 1: Gravel Bed Filter; Option 2: Multiple Venturi Scrubber Increased decay heat removal capability for non-ATWS events, with scrubbing of released fission products.
CONT01  
$793K  
$1.2M  
$717K  
$1.1M  
$1.7M  
>$2M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
96 Provide post-accident containment inerting capability.
Reduced likelihood of hydrogen and carbon monoxide gas combustion.
H2BURN  
$10K  
$15K  
$9K  
$13K  
$20K  
>$100K Expert Panel Not Cost-Beneficial Cost will exceed benefit.
97 Create a large concrete crucible with heat removal potential to contain molten core debris.
Increased cooling and containment of molten core debris. Molten core debris escaping from the vessel is contained within the crucible and a water cooling mechanism cools the molten core in the crucible, preventing melt-through of the base mat.
MAB
>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.  


ULNRC-05919 October 17, 2012 Enclosure 1                                                                                                              Page 21 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway                                                                                         Benefit at Benefit at         Benefit SAMA                                                                              SAMA          3% Disc   Realistic Benefit at 95%
ULNRC-05919 October 17, 2012 Page 21 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway SAMA Number Potential Improvement Discussion SAMA Case Benefit Benefit at 3% Disc Rate Benefit at Realistic Disc Rate Benefit at 33yrs Benefit at 95%
Number            Potential Improvement                      Discussion            Case Benefit    Rate    Disc Rate  at 33yrs  CDF     Cost Cost Basis Evaluation Basis for Evaluation 98   Create a core melt source reduction   Increased cooling and               MAB                                                >$10M  Expert Panel Not Cost-  Cost will exceed system.                                containment of molten core                                                                                   Beneficial benefit.
CDF Cost Cost Basis Evaluation Basis for Evaluation 98 Create a core melt source reduction system.
debris. Refractory material would be placed underneath the reactor vessel such that a molten core falling on the material would melt and combine with the material. Subsequent spreading and heat removal from the vitrified compound would be facilitated, and concrete attack would not occur.
Increased cooling and containment of molten core debris. Refractory material would be placed underneath the reactor vessel such that a molten core falling on the material would melt and combine with the material. Subsequent spreading and heat removal from the vitrified compound would be facilitated, and concrete attack would not occur.
99   Strengthen primary/secondary           Reduced probability of             CONT01 $1.2M     $1.2M     $717K     $1.1M   $1.7M   >$10M Expert Panel Not Cost- Cost will exceed containment (e.g., add ribbing to      containment over-pressurization.                                                                            Beneficial benefit.
MAB
containment shell).
>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
100   Increase depth of the concrete base   Reduced probability of base mat     MAB                                                 >$10M Expert Panel Not Cost- Cost will exceed mat or use an alternate concrete      melt-through.                                                                                                Beneficial benefit.
99 Strengthen primary/secondary containment (e.g., add ribbing to containment shell).
material to ensure melt-through does not occur.
Reduced probability of containment over-pressurization.
102   Construct a building to be connected   Reduced probability of             CONT01 $1.2M     $1.2M     $717K     $1.1M   $1.7M   >$10M Expert Panel Not Cost- Cost will exceed to primary/secondary containment      containment over-pressurization.                                                                            Beneficial benefit.
CONT01  
and maintained at a vacuum.
$1.2M  
104   Improve leak detection procedures. Increased piping surveillance to   LOCA05 $685K     $1.2M     $620K     $1.1M   $1.5M   >$2M Expert Panel Not Cost- Cost will exceed identify leaks prior to complete                                                                            Beneficial benefit.
$1.2M  
failure. Improved leak detection would reduce LOCA frequency.
$717K  
107   Install a redundant containment spray Increased containment heat         CONT01 $1.2M     $1.2M     $717K     $1.1M   $1.7M   >$2M Expert Panel Not Cost- Cost will exceed system.                                removal ability.                                                                                            Beneficial benefit.
$1.1M  
108   Install an independent power supply Reduced hydrogen detonation          H2BURN  $10K    $15K      $9K      $13K    $20K  >$100K Expert Panel Not Cost-to the hydrogen control system using potential.                                                                                                    Beneficial either new batteries, a non-safety grade portable generator, existing station batteries, or existing AC/DC independent power supplies, such as the security system diesel.
$1.7M  
109   Install a passive hydrogen control     Reduced hydrogen detonation       H2BURN $10K     $15K       $9K       $13K     $20K   >$100M Expert Panel Not Cost- Cost will exceed system.                                potential.                                                                                                  Beneficial benefit.
>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
110   Erect a barrier that would provide     Reduced probability of              MAB                                                >$10M  Expert Panel Not Cost-  Cost will exceed enhanced protection of the             containment failure.                                                                                        Beneficial benefit.
100 Increase depth of the concrete base mat or use an alternate concrete material to ensure melt-through does not occur.
containment walls (shell) from ejected core debris following a core melt scenario at high pressure.
Reduced probability of base mat melt-through.
111   Install additional pressure or leak   Reduced ISLOCA frequency.         ISLOCA $123K   $179K     $111K     $154K   $259K   >$500K Expert Panel Not Cost- Cost will exceed monitoring instruments for detection                                                                                                                Beneficial benefit.
MAB  
of ISLOCAs.
>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
112   Add redundant and diverse limit       Reduced frequency of               CONT02   $1K     $1K       $1K       $1K     $2K   >$1M Expert Panel Not Cost- Cost will exceed switches to each containment          containment isolation failure and                                                                            Beneficial benefit.
102 Construct a building to be connected to primary/secondary containment and maintained at a vacuum.
isolation valve.                      ISLOCAs.
Reduced probability of containment over-pressurization.
113   Increase leak testing of valves in     Reduced ISLOCA frequency.         ISLOCA $123K   $179K     $111K     $154K   $259K   >$1M Expert Panel Not Cost- Cost will exceed ISLOCA paths.                                                                                                                                      Beneficial benefit.
CONT01  
$1.2M  
$1.2M  
$717K  
$1.1M  
$1.7M  
>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
104 Improve leak detection procedures.
Increased piping surveillance to identify leaks prior to complete failure. Improved leak detection would reduce LOCA frequency.
LOCA05  
$685K  
$1.2M  
$620K  
$1.1M  
$1.5M  
>$2M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
107 Install a redundant containment spray system.
Increased containment heat removal ability.
CONT01  
$1.2M  
$1.2M  
$717K  
$1.1M  
$1.7M  
>$2M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
108 Install an independent power supply to the hydrogen control system using either new batteries, a non-safety grade portable generator, existing station batteries, or existing AC/DC independent power supplies, such as the security system diesel.
Reduced hydrogen detonation potential.
H2BURN
$10K
$15K
$9K
$13K
$20K
>$100K Expert Panel Not Cost-Beneficial 109 Install a passive hydrogen control system.
Reduced hydrogen detonation potential.
H2BURN  
$10K  
$15K  
$9K  
$13K  
$20K  
>$100M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
110 Erect a barrier that would provide enhanced protection of the containment walls (shell) from ejected core debris following a core melt scenario at high pressure.
Reduced probability of containment failure.
MAB
>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
111 Install additional pressure or leak monitoring instruments for detection of ISLOCAs.
Reduced ISLOCA frequency.
ISLOCA  
$123K  
$179K  
$111K  
$154K  
$259K  
>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.
112 Add redundant and diverse limit switches to each containment isolation valve.
Reduced frequency of containment isolation failure and ISLOCAs.
CONT02  
$1K  
$1K  
$1K  
$1K  
$2K  
>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
113 Increase leak testing of valves in ISLOCA paths.
Reduced ISLOCA frequency.
ISLOCA  
$123K  
$179K  
$111K  
$154K  
$259K  
>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.  


ULNRC-05919 October 17, 2012 Enclosure 1                                                                                                            Page 22 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway                                                                                         Benefit at Benefit at         Benefit SAMA                                                                              SAMA          3% Disc   Realistic Benefit at 95%
ULNRC-05919 October 17, 2012 Page 22 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway SAMA Number Potential Improvement Discussion SAMA Case Benefit Benefit at 3% Disc Rate Benefit at Realistic Disc Rate Benefit at 33yrs Benefit at 95%
Number            Potential Improvement                      Discussion            Case Benefit    Rate    Disc Rate  at 33yrs  CDF     Cost Cost Basis Evaluation   Basis for Evaluation 114   Install self-actuating containment     Reduced frequency of isolation CONT02   $1K     $1K       $1K       $1K     $2K   >$500K Expert Panel Not Cost- Cost will exceed isolation valves.                      failure.                                                                                                  Beneficial benefit.
CDF Cost Cost Basis Evaluation Basis for Evaluation 114 Install self-actuating containment isolation valves.
115   Locate residual heat removal (RHR)     Reduced frequency of ISLOCA     ISLOCA $123K   $179K     $111K     $154K   $259K   >$1M Expert Panel Not Cost- Cost will exceed inside containment                      outside containment.                                                                                      Beneficial benefit.
Reduced frequency of isolation failure.
116   Ensure ISLOCA releases are             Scrubbed ISLOCA releases.       ISLOCA $123K   $179K     $111K     $154K   $259K   >$1M Expert Panel Not Cost- Cost would exceed scrubbed. One method is to plug                                                                                                                    Beneficial benefit. Current plant drains in potential break areas so that                                                                                                                      design requires break point will be covered with                                                                                                                              drains to be open.
CONT02  
water.                                                                                                                                                        Analysis and license changes required to implement are included in the cost estimate.
$1K  
119   Institute a maintenance practice to     Reduced frequency of steam     NOSGTR $1.4M     $2.1M     $1.2M     $1.8M   $2.9M   >$3M Expert Panel Not Cost- Cost will exceed perform a 100% inspection of steam      generator tube ruptures.                                                                                  Beneficial benefit.
$1K  
generator tubes during each refueling outage.
$1K  
121   Increase the pressure capacity of the   Eliminates release pathway to   NOSGTR $1.4M     $2.1M     $1.2M     $1.8M   $2.9M   >$10M Expert Panel Not Cost- Cost will exceed secondary side so that a steam          the environment following a                                                                               Beneficial benefit.
$1K  
generator tube rupture would not        steam generator tube rupture.
$2K  
cause the relief valves to lift.
>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.
122    Install a redundant spray system to    Enhanced depressurization      NOSGTR  $1.4M     $2.1M     $1.2M     $1.8M   $2.9M   >$10M Expert Panel Not Cost- Cost will exceed depressurize the primary system        capabilities during steam                                                                                  Beneficial benefit.
115 Locate residual heat removal (RHR) inside containment Reduced frequency of ISLOCA outside containment.
during a steam generator tube          generator tube rupture.
ISLOCA  
rupture 125   Route the discharge from the main       Reduced consequences of a       NOSGTR $1.4M     $2.1M     $1.2M     $1.8M   $2.9M   >$10M Expert Panel Not Cost- Cost will exceed steam safety valves through a          steam generator tube rupture.                                                                              Beneficial benefit.
$123K  
structure where a water spray would condense the steam and remove most of the fission products.
$179K  
126   Install a highly reliable (closed loop) Reduced consequences of a       NOSGTR $1.4M     $2.1M     $1.2M     $1.8M   $2.9M   >$10M Expert Panel Not Cost- Cost will exceed steam generator shell-side heat        steam generator tube rupture.                                                                              Beneficial benefit.
$111K  
removal system that relies on natural circulation and stored water sources 129   Vent main steam safety valves in       Reduced consequences of a       NOSGTR $1.4M     $2.1M     $1.2M     $1.8M   $2.9M   >$10M Expert Panel Not Cost- Cost will exceed containment.                            steam generator tube rupture.                                                                              Beneficial benefit. Current containment design does not support this modification.
$154K  
$259K  
>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
116 Ensure ISLOCA releases are scrubbed. One method is to plug drains in potential break areas so that break point will be covered with water.
Scrubbed ISLOCA releases.
ISLOCA  
$123K  
$179K  
$111K  
$154K  
$259K  
>$1M Expert Panel Not Cost-Beneficial Cost would exceed benefit. Current plant design requires drains to be open.
Analysis and license changes required to implement are included in the cost estimate.
119 Institute a maintenance practice to perform a 100% inspection of steam generator tubes during each refueling outage.
Reduced frequency of steam generator tube ruptures.
NOSGTR  
$1.4M  
$2.1M  
$1.2M  
$1.8M  
$2.9M  
>$3M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
121 Increase the pressure capacity of the secondary side so that a steam generator tube rupture would not cause the relief valves to lift.
Eliminates release pathway to the environment following a steam generator tube rupture.
NOSGTR  
$1.4M  
$2.1M  
$1.2M  
$1.8M  
$2.9M  
>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
122 Install a redundant spray system to depressurize the primary system during a steam generator tube rupture Enhanced depressurization capabilities during steam generator tube rupture.
NOSGTR
$1.4M  
$2.1M  
$1.2M  
$1.8M  
$2.9M  
>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
125 Route the discharge from the main steam safety valves through a structure where a water spray would condense the steam and remove most of the fission products.
Reduced consequences of a steam generator tube rupture.
NOSGTR  
$1.4M  
$2.1M  
$1.2M  
$1.8M  
$2.9M  
>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
126 Install a highly reliable (closed loop) steam generator shell-side heat removal system that relies on natural circulation and stored water sources Reduced consequences of a steam generator tube rupture.
NOSGTR  
$1.4M  
$2.1M  
$1.2M  
$1.8M  
$2.9M  
>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
129 Vent main steam safety valves in containment.
Reduced consequences of a steam generator tube rupture.
NOSGTR  
$1.4M  
$2.1M  
$1.2M  
$1.8M  
$2.9M  
>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit. Current containment design does not support this modification.
Modifications to containment and associated analysis are included in the cost estimate.
Modifications to containment and associated analysis are included in the cost estimate.
130   Add an independent boron injection     Improved availability of boron NOATWS   $63K   $104K       $57K     $90K   $134K   >$1M Expert Panel Not Cost- Cost will exceed system.                                injection during ATWS.                                                                                    Beneficial benefit.
130 Add an independent boron injection system.
131   Add a system of relief valves to       Improved equipment availability NOATWS   $63K   $104K       $57K     $90K   $134K   >$2M Expert Panel Not Cost- Cost will exceed prevent equipment damage from          after an ATWS.                                                                                            Beneficial benefit.
Improved availability of boron injection during ATWS.
pressure spikes during an ATWS.
NOATWS  
$63K  
$104K  
$57K  
$90K  
$134K  
>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
131 Add a system of relief valves to prevent equipment damage from pressure spikes during an ATWS.
Improved equipment availability after an ATWS.
NOATWS  
$63K  
$104K  
$57K  
$90K  
$134K  
>$2M Expert Panel Not Cost-Beneficial Cost will exceed benefit.  


ULNRC-05919 October 17, 2012 Enclosure 1                                                                                                                  Page 23 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway                                                                                               Benefit at Benefit at         Benefit SAMA                                                                                    SAMA          3% Disc   Realistic Benefit at 95%
ULNRC-05919 October 17, 2012 Page 23 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway SAMA Number Potential Improvement Discussion SAMA Case Benefit Benefit at 3% Disc Rate Benefit at Realistic Disc Rate Benefit at 33yrs Benefit at 95%
Number              Potential Improvement                        Discussion              Case  Benefit    Rate    Disc Rate  at 33yrs  CDF     Cost Cost Basis   Evaluation       Basis for Evaluation 133   Install an ATWS sized filtered             Increased ability to remove       NOATWS   $63K   $104K       $57K     $90K   $134K   >$1M Expert Panel   Not Cost-     Cost will exceed containment vent to remove decay          reactor heat from ATWS events.                                                                                  Beneficial    benefit heat.
CDF Cost Cost Basis Evaluation Basis for Evaluation 133 Install an ATWS sized filtered containment vent to remove decay heat.
136   Install motor generator set trip           Reduced frequency of core         NOATWS   $63K   $104K       $57K     $90K   $134K   >$500K Expert Panel   Not Cost-     Cost will exceed breakers in control room.                  damage due to an ATWS.                                                                                          Beneficial    benefit.
Increased ability to remove reactor heat from ATWS events.
147   Install digital large break LOCA           Reduced probability of a large     LOCA05 $689K     $1.2M     $620K     $1.1M   $1.5M   >$5M Expert Panel   Not Cost-     Cost will exceed protection system.                        break LOCA (a leak before                                                                                      Beneficial    benefit.
NOATWS  
break).
$63K  
153   Install secondary side guard pipes up Prevents secondary side                  NOSLB  $51K    $87K      $46K      $77K    $108K    >$1M  Expert Panel    Not Cost-    Cost will exceed to the main steam isolation valves.       depressurization should a steam                                                                                 Beneficial    benefit.
$104K  
line break occur upstream of the main steam isolation valves.
$57K  
$90K  
$134K  
>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit 136 Install motor generator set trip breakers in control room.
Reduced frequency of core damage due to an ATWS.
NOATWS  
$63K  
$104K  
$57K  
$90K  
$134K  
>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.
147 Install digital large break LOCA protection system.
Reduced probability of a large break LOCA (a leak before break).
LOCA05  
$689K  
$1.2M  
$620K  
$1.1M  
$1.5M  
>$5M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
153 Install secondary side guard pipes up to the main steam isolation valves.
Prevents secondary side depressurization should a steam line break occur upstream of the main steam isolation valves.
Also guards against or prevents consequential multiple steam generator tube ruptures following a main steam line break event.
Also guards against or prevents consequential multiple steam generator tube ruptures following a main steam line break event.
160   Modifications to lessen impact of         Lower impact of flood that                                                                 <$50K Expert Panel   Potentially   Relatively minor internal flooding path through Control propagates through the                                                                                            Cost-Beneficial modifications to door Building dumbwaiter.                      dumbwaiter                                                                                                                    opening could result in lower flow to the dumbwaiter. Specific benefit could not be calculated but SAMA item is judged to be low cost and therefore potentially cost beneficial.
NOSLB
161   Improvements to PORV performance           Decrease in risk due to PORV       PORV   $18K     $32K       $16K     $28K     $39K   >$100K Expert Panel   Not Cost-     Cost will exceed that will lower the probability of failure failing to open.                                                                                                Beneficial    benefit.
$51K
to open.
$87K
162   Install a large volume EDG fuel oil       Allows transfer of EDF fuel oil   EDGFUEL $124K   $131K     $113K     $156K   $263K   $150K Wolf Creek   Potentially   Wolf Creek estimated tank at an elevation greater than the      to the EDG day tanks on                                                                                      Cost-Beneficial cost of $150K is less EDG fuel oil day tanks.                    failure of the fuel oil transfer                                                                                              than the potential pumps.                                                                                                                        benefit.
$46K
163   Improve feedwater check valve             Lower risk due to failures in       FW02   $127K   $218K     $115K     $191K   $270K   >$500K Expert Panel   Not Cost-     Cost will exceed reliability to reduce probability of      which feedwater check valves                                                                                    Beneficial    benefit.
$77K
failure to open.                          fail to open and allow feeding of the steam generators.
$108K
164   Provide the capability to power the       Provide backup to ESW in           SW03   $1191K   $307K     $172K     $267K   $403K   >$500K Expert Panel   Not Cost-     Cost will exceed normal service water pumps from            conditions with power only                                                                                      Beneficial    benefit.
>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.
AEPS.                                      available from AEPS.
160 Modifications to lessen impact of internal flooding path through Control Building dumbwaiter.
171   Increase the size of the RWST or           Ensure a supply of makeup         LOCA04   $13K     $23K       $12K     $20K     $27K   >$100K Expert Panel   Not Cost-     Cost will exceed otherwise improve the availability of      water is available from the                                                                                    Beneficial    benefit.
Lower impact of flood that propagates through the dumbwaiter
the RWST                                  RWST.
<$50K Expert Panel Potentially Cost-Beneficial Relatively minor modifications to door opening could result in lower flow to the dumbwaiter. Specific benefit could not be calculated but SAMA item is judged to be low cost and therefore potentially cost beneficial.
178   Improvements to UHS cooling tower         Improve availability or mitigate   HVAC02 $113K   $181K     $102K     $158K   $239K   <$100K Expert Panel Potentially Cost Implementation of electrical room HVAC.                      loss of HVAC.                                                                                                  Beneficial    temporary ventilation or opening of doors will be a lower cost than the calculated benefit.
161 Improvements to PORV performance that will lower the probability of failure to open.
Decrease in risk due to PORV failing to open.
PORV  
$18K  
$32K  
$16K  
$28K  
$39K  
>$100K Expert Panel Not Cost-Beneficial Cost will exceed benefit.
162 Install a large volume EDG fuel oil tank at an elevation greater than the EDG fuel oil day tanks.
Allows transfer of EDF fuel oil to the EDG day tanks on failure of the fuel oil transfer pumps.
EDGFUEL  
$124K  
$131K  
$113K  
$156K  
$263K  
$150K Wolf Creek Potentially Cost-Beneficial Wolf Creek estimated cost of $150K is less than the potential benefit.
163 Improve feedwater check valve reliability to reduce probability of failure to open.
Lower risk due to failures in which feedwater check valves fail to open and allow feeding of the steam generators.
FW02  
$127K  
$218K  
$115K  
$191K  
$270K  
>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.
164 Provide the capability to power the normal service water pumps from AEPS.
Provide backup to ESW in conditions with power only available from AEPS.
SW03  
$1191K  
$307K  
$172K  
$267K  
$403K  
>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.
171 Increase the size of the RWST or otherwise improve the availability of the RWST Ensure a supply of makeup water is available from the RWST.
LOCA04  
$13K  
$23K  
$12K  
$20K  
$27K  
>$100K Expert Panel Not Cost-Beneficial Cost will exceed benefit.
178 Improvements to UHS cooling tower electrical room HVAC.
Improve availability or mitigate loss of HVAC.
HVAC02  
$113K  
$181K  
$102K  
$158K  
$239K  
<$100K Expert Panel Potentially Cost Beneficial Implementation of temporary ventilation or opening of doors will be a lower cost than the calculated benefit.  


ULNRC-05919 October 17, 2012 Enclosure 1                                                                                                            Page 24 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway                                                                                       Benefit at Benefit at         Benefit SAMA                                                                              SAMA          3% Disc   Realistic Benefit at 95%
ULNRC-05919 October 17, 2012 Page 24 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway SAMA Number Potential Improvement Discussion SAMA Case Benefit Benefit at 3% Disc Rate Benefit at Realistic Disc Rate Benefit at 33yrs Benefit at 95%
Number            Potential Improvement                        Discussion        Case Benefit  Rate    Disc Rate  at 33yrs  CDF     Cost   Cost Basis   Evaluation       Basis for Evaluation 179   Modify procedures such that the           Prevents possible thermally   RAI7a $63K     $87K       $57K     $75K   $134K   <$100K Expert Panel Potentially Cost Implementation of water loop seals in the RCS cold legs induced steam generator tube                                                                                  Beneficial    procedure change are not cleared following core            rupture following core damage.                                                                                          will be lower cost damage.                                                                                                                                                            than benefit, especially if 95%
CDF Cost Cost Basis Evaluation Basis for Evaluation 179 Modify procedures such that the water loop seals in the RCS cold legs are not cleared following core damage.
Prevents possible thermally induced steam generator tube rupture following core damage.
RAI7a  
$63K  
$87K  
$57K  
$75K  
$134K  
<$100K Expert Panel Potentially Cost Beneficial Implementation of procedure change will be lower cost than benefit, especially if 95%
CDF benefit is considered.
CDF benefit is considered.
180   Install lower amperage fuses for         Reduced fire risk.                                                                                      Potentially Cost SAMA considered various 14 AWG control circuits in the                                                                                                             Beneficial    potentially cost MCR. The majority of the                                                                                                                                           beneficial without modification centers around the trip                                                                                                                               benefit or cost circuit fuses on NB, NG, PA, PB, and                                                                                                                               determination since PG system breakers.                                                                                                                                               the NFPA 805 license amendment request committed to performing the modification.
180 Install lower amperage fuses for various 14 AWG control circuits in the MCR. The majority of the modification centers around the trip circuit fuses on NB, NG, PA, PB, and PG system breakers.
181   Install redundant fuses and isolation     Reduced fire risk.                                                                                      Potentially Cost SAMA considered switches for MCR evacuation                                                                                                                         Beneficial    potentially cost procedure OTO-ZZ-00001.                                                                                                                                           beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.
Reduced fire risk.
182   To protect against multiple spurious     Reduced fire risk.                                                                                      Potentially Cost SAMA considered operation scenarios, cable runs will                                                                                                               Beneficial    potentially cost be changed to run a single wire in a                                                                                                                               beneficial without protected metal jacket such that                                                                                                                                   benefit or cost spurious valve opening due to a hot                                                                                                                               determination since short affecting the valve control circuit                                                                                                                         the NFPA 805 is eliminated for the fire area. This                                                                                                                             license amendment modification will be implemented in                                                                                                                               request committed to multiple fire areas.                                                                                                                                               performing the modification.
Potentially Cost Beneficial SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.
183   Quick response sprinkler heads in         Reduced fire risk.                                                                                      Potentially Cost SAMA considered cable chases A-11, C-30, and C-31                                                                                                                   Beneficial    potentially cost will be modified to be in accordance                                                                                                                               beneficial without with the applicable requirements of                                                                                                                               benefit or cost NFPA 13-1976 edition.                                                                                                                                             determination since the NFPA 805 license amendment request committed to performing the modification.
181 Install redundant fuses and isolation switches for MCR evacuation procedure OTO-ZZ-00001.
Reduced fire risk.
Potentially Cost Beneficial SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.
182 To protect against multiple spurious operation scenarios, cable runs will be changed to run a single wire in a protected metal jacket such that spurious valve opening due to a hot short affecting the valve control circuit is eliminated for the fire area. This modification will be implemented in multiple fire areas.
Reduced fire risk.
Potentially Cost Beneficial SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.
183 Quick response sprinkler heads in cable chases A-11, C-30, and C-31 will be modified to be in accordance with the applicable requirements of NFPA 13-1976 edition.
Reduced fire risk.
Potentially Cost Beneficial SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.  


ULNRC-05919 October 17, 2012 Enclosure 1                                                                                                          Page 25 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway                                                                                     Benefit at Benefit at         Benefit SAMA                                                                            SAMA          3% Disc   Realistic Benefit at 95%
ULNRC-05919 October 17, 2012 Page 25 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway SAMA Number Potential Improvement Discussion SAMA Case Benefit Benefit at 3% Disc Rate Benefit at Realistic Disc Rate Benefit at 33yrs Benefit at 95%
Number            Potential Improvement                      Discussion        Case Benefit  Rate    Disc Rate  at 33yrs  CDF     Cost Cost Basis   Evaluation       Basis for Evaluation 184   Improvements in the reliability of the More reliable main steam line   SLIS   $28K     $40K       $23K     $35K     $55K   >$500K Expert Panel   Not Cost-     Cost is for installation Steam Line Isolation automatic        isolation.                                                                                                Beneficial    of redundant signal.                                                                                                                                                          instrumentation system and would likely be much higher.
CDF Cost Cost Basis Evaluation Basis for Evaluation 184 Improvements in the reliability of the Steam Line Isolation automatic signal.
More reliable main steam line isolation.
SLIS  
$28K  
$40K  
$23K  
$35K  
$55K  
>$500K Expert Panel Not Cost-Beneficial Cost is for installation of redundant instrumentation system and would likely be much higher.
Procedure and training already direct operators to manually back up failed automatic actuations.
Procedure and training already direct operators to manually back up failed automatic actuations.
185   Automate initiation of CCW flow to     More reliable than manual       HEP   $62K   $112K       $56K     $99K   $132K   >$200K Expert Panel Potentially Cost the RHR heat exchangers.              initiation of flow to RHR HX.                                                                              Beneficial 186   Develop a procedure and obtain         Backup method of removing     FWCCW   $1K     $2K       $1K       $2K     $2K   >$1M Expert Panel   Not Cost     Ability to do this will equipment to provide a temporary      decay heat if CCW is lost.                                                                                Beneficial    require larger fire hookup of fire water to the RHR heat                                                                                                                            pumps exchangers to use as a backup to CCW for removing decay heat.
185 Automate initiation of CCW flow to the RHR heat exchangers.
187   Install modification to power the     Another source of backup     SBOMOD $174K   $272K     $157K     $236K   $367K   $350K Expert Panel Potentially Cost Already installed normal charging pump from an          power to the NCP in cases of                                                                              Beneficial    spare circuit breaker, existing spare breaker from the        station blackout or loss of                                                                                              implementation AEPS.                                  service water                                                                                                            requires power and control cables.
More reliable than manual initiation of flow to RHR HX.
188   Install a permanent, dedicated         Another source of backup      SBOMOD2 $182K    $285K      $165K    $247K    $385K    $400K Expert Panel Potentially Cost AEPS was installed generator for the NCP, and a motor-   power to the NCP, DC power                                                                                 Beneficial    with a spare breaker driven AFW pump and battery            (pump/valve control and SG                                                                                               and expansion charger to address SBO events in      level instrumentation), and                                                                                               capability that could which the TD AFW pump is              power to an AFW pump in                                                                                                   be used to supply unavailable.                          cases of station blackout or                                                                                             various equipment.
HEP  
loss of service water
$62K  
$112K  
$56K  
$99K  
$132K  
>$200K Expert Panel Potentially Cost Beneficial 186 Develop a procedure and obtain equipment to provide a temporary hookup of fire water to the RHR heat exchangers to use as a backup to CCW for removing decay heat.
Backup method of removing decay heat if CCW is lost.
FWCCW  
$1K  
$2K  
$1K  
$2K  
$2K  
>$1M Expert Panel Not Cost Beneficial Ability to do this will require larger fire pumps 187 Install modification to power the normal charging pump from an existing spare breaker from the AEPS.
Another source of backup power to the NCP in cases of station blackout or loss of service water SBOMOD  
$174K  
$272K  
$157K  
$236K  
$367K  
$350K Expert Panel Potentially Cost Beneficial Already installed spare circuit breaker, implementation requires power and control cables.
188 Install a permanent, dedicated generator for the NCP, and a motor-driven AFW pump and battery charger to address SBO events in which the TD AFW pump is unavailable.
Another source of backup power to the NCP, DC power (pump/valve control and SG level instrumentation), and power to an AFW pump in cases of station blackout or loss of service water SBOMOD2
$182K
$285K
$165K
$247K
$385K
$400K Expert Panel Potentially Cost Beneficial AEPS was installed with a spare breaker and expansion capability that could be used to supply various equipment.


ULNRC-05919 October 17, 2012                                                                     Page 26 of 34 Table 9-1. Callaway Plant Potentially Cost Beneficial SAMAs Callaway SAMA Number     Potential Improvement             Discussion         Additional Discussion 11         Improve 4.16-kV bus         Increased availability of  Physical cross-tie exists, cross-tie ability.           on-site AC power.         but there is no analysis or procedures to allow its use except in specific outage conditions. Cost is to develop procedures and analysis to allow use of the cross-tie.
ULNRC-05919 October 17, 2012 Page 26 of 34 Table 9-1. Callaway Plant Potentially Cost Beneficial SAMAs Callaway SAMA Number Potential Improvement Discussion Additional Discussion 11 Improve 4.16-kV bus cross-tie ability.
Increased availability of on-site AC power.
Physical cross-tie exists, but there is no analysis or procedures to allow its use except in specific outage conditions. Cost is to develop procedures and analysis to allow use of the cross-tie.
Benefit calculated is under-estimated since it was evaluated for only SBO sequences.
Benefit calculated is under-estimated since it was evaluated for only SBO sequences.
29     Provide capability for       Improved injection        Currently being alternate injection via     capability.                evaluated by plant diesel-driven fire pump.                               improvement program.
29 Provide capability for alternate injection via diesel-driven fire pump.
Improved injection capability.
Currently being evaluated by plant improvement program.
Would use unborated water and portable pump (fire truck).
Would use unborated water and portable pump (fire truck).
Calculation of specific benefit of this SAMA was not performed since it is judged to be potentially low cost.
Calculation of specific benefit of this SAMA was not performed since it is judged to be potentially low cost.
Evaluation will consider impacts of injection of non-borated water.
Evaluation will consider impacts of injection of non-borated water.
64     Implement procedure and     Improved ability to cool   Cost based on hardware modifications to    residual heat removal heat development of allow manual alignment of    exchangers.                procedure for temporary the fire water system to the                            hookup of fire water to component cooling water                                CCW heat exchangers.
64 Implement procedure and hardware modifications to allow manual alignment of the fire water system to the component cooling water system, or install a component cooling water header cross-tie.
system, or install a                                    Cost of permanent component cooling water                                modification would be header cross-tie.                                      much greater.
Improved ability to cool residual heat removal heat exchangers.
Cost based on development of procedure for temporary hookup of fire water to CCW heat exchangers.
Cost of permanent modification would be much greater.  


ULNRC-05919 October 17, 2012                                                                       Page 27 of 34 Table 9-1. Callaway Plant Potentially Cost Beneficial SAMAs Callaway SAMA Number       Potential Improvement               Discussion         Additional Discussion 80     Provide a redundant train     Increased availability of  Procedures to open or means of ventilation.     components dependent on     doors or provide room cooling.              temporary ventilation may be cost beneficial for the EDGs, MDAFW pumps, and charging pumps. Procedures for opening doors to the DC switchgear rooms exist.
ULNRC-05919 October 17, 2012 Page 27 of 34 Table 9-1. Callaway Plant Potentially Cost Beneficial SAMAs Callaway SAMA Number Potential Improvement Discussion Additional Discussion 80 Provide a redundant train or means of ventilation.
160     Modifications to lessen       Lower impact of flood that impact of internal flooding   propagates through the path through Control         dumbwaiter Building dumbwaiter.
Increased availability of components dependent on room cooling.
162     Install a large volume EDG   Allows transfer of EDG fuel fuel oil tank at an elevation oil to the EDG day tanks greater than the EDG fuel    on failure of the fuel oil oil day tanks.                transfer pumps.
Procedures to open doors or provide temporary ventilation may be cost beneficial for the EDGs, MDAFW pumps, and charging pumps. Procedures for opening doors to the DC switchgear rooms exist.
178     Improvements to UHS           Improve availability or         Implementation of cooling tower electrical      mitigate loss of HVAC.       temporary ventilation or room HVAC.                                                opening of doors will be a lower cost than the calculated benefit.
160 Modifications to lessen impact of internal flooding path through Control Building dumbwaiter.
179     Modify procedures such       Prevents possible                Implementation of that the water loop seals in thermally induced steam      procedure change will the RCS cold legs are not     generator tube rupture         be lower cost than cleared following core        following core damage.        benefit, especially if damage.                                                      95% CDF benefit is considered.
Lower impact of flood that propagates through the dumbwaiter 162 Install a large volume EDG fuel oil tank at an elevation greater than the EDG fuel oil day tanks.
Allows transfer of EDG fuel oil to the EDG day tanks on failure of the fuel oil transfer pumps.
178 Improvements to UHS cooling tower electrical room HVAC.
Improve availability or mitigate loss of HVAC.
Implementation of temporary ventilation or opening of doors will be a lower cost than the calculated benefit.
179 Modify procedures such that the water loop seals in the RCS cold legs are not cleared following core damage.
Prevents possible thermally induced steam generator tube rupture following core damage.
Implementation of procedure change will be lower cost than benefit, especially if 95% CDF benefit is considered.  


ULNRC-05919 October 17, 2012                                                             Page 28 of 34 Table 9-1. Callaway Plant Potentially Cost Beneficial SAMAs Callaway SAMA Number       Potential Improvement             Discussion   Additional Discussion 180     Install lower amperage       Reduced fire risk. SAMA considered fuses for various 14 AWG                             potentially cost control circuits in the MCR.                     beneficial without benefit The majority of the                               or cost determination modification centers                               since the NFPA 805 around the trip circuit fuses                     license amendment on NB, NG, PA, PB, and                           request committed to PG system breakers.                                   performing the modification.
ULNRC-05919 October 17, 2012 Page 28 of 34 Table 9-1. Callaway Plant Potentially Cost Beneficial SAMAs Callaway SAMA Number Potential Improvement Discussion Additional Discussion 180 Install lower amperage fuses for various 14 AWG control circuits in the MCR.
181     Install redundant fuses and   Reduced fire risk. SAMA considered isolation switches for MCR                           potentially cost evacuation procedure                             beneficial without benefit OTO-ZZ-00001.                                     or cost determination since the NFPA 805 license amendment request committed to performing the modification.
The majority of the modification centers around the trip circuit fuses on NB, NG, PA, PB, and PG system breakers.
182     To protect against multiple   Reduced fire risk. SAMA considered spurious operation                                   potentially cost scenarios, cable runs will                       beneficial without benefit be changed to run a single                       or cost determination wire in a protected metal                         since the NFPA 805 jacket such that spurious                         license amendment valve opening due to a hot                       request committed to short affecting the valve                             performing the control circuit is eliminated                         modification.
Reduced fire risk.
for the fire area. This modification will be implemented in multiple fire areas.
SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.
181 Install redundant fuses and isolation switches for MCR evacuation procedure OTO-ZZ-00001.
Reduced fire risk.
SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.
182 To protect against multiple spurious operation scenarios, cable runs will be changed to run a single wire in a protected metal jacket such that spurious valve opening due to a hot short affecting the valve control circuit is eliminated for the fire area. This modification will be implemented in multiple fire areas.
Reduced fire risk.
SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.  


ULNRC-05919 October 17, 2012                                                                     Page 29 of 34 Table 9-1. Callaway Plant Potentially Cost Beneficial SAMAs Callaway SAMA Number     Potential Improvement               Discussion         Additional Discussion 183     Quick response sprinkler   Reduced fire risk.              SAMA considered heads in cable chases A-                                     potentially cost 11, C-30, and C-31 will be                             beneficial without benefit modified to be in                                         or cost determination accordance with the                                       since the NFPA 805 applicable requirements of                                 license amendment NFPA 13-1976 edition.                                     request committed to performing the modification.
ULNRC-05919 October 17, 2012 Page 29 of 34 Table 9-1. Callaway Plant Potentially Cost Beneficial SAMAs Callaway SAMA Number Potential Improvement Discussion Additional Discussion 183 Quick response sprinkler heads in cable chases A-11, C-30, and C-31 will be modified to be in accordance with the applicable requirements of NFPA 13-1976 edition.
185     Automate initiation of CCW More reliable than manual flow to the RHR heat       initiation of flow to RHR exchangers.                HX.
Reduced fire risk.
187       Install modification to     Another source of backup   Already installed spare power the normal charging  power to the NCP in cases   circuit breaker, pump from an existing      of station blackout or loss implementation requires spare breaker from the      of service water           power and control AEPS.                                                  cables.
SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.
188       Install a permanent,       Another source of backup    AEPS was installed with dedicated generator for the power to the NCP, DC        a spare breaker and NCP, and a motor-driven     power (pump/valve control   expansion capability that AFW pump and battery        and SG level               could be used to supply charger to address SBO      instrumentation), and       various equipment.
185 Automate initiation of CCW flow to the RHR heat exchangers.
events in which the TD      power to an AFW pump in AFW pump is unavailable. cases of station blackout or loss of service water
More reliable than manual initiation of flow to RHR HX.
187 Install modification to power the normal charging pump from an existing spare breaker from the AEPS.
Another source of backup power to the NCP in cases of station blackout or loss of service water Already installed spare circuit breaker, implementation requires power and control cables.
188 Install a permanent, dedicated generator for the NCP, and a motor-driven AFW pump and battery charger to address SBO events in which the TD AFW pump is unavailable.
Another source of backup power to the NCP, DC power (pump/valve control and SG level instrumentation), and power to an AFW pump in cases of station blackout or loss of service water AEPS was installed with a spare breaker and expansion capability that could be used to supply various equipment.


ULNRC-05919 October 17, 2012                                                                 Page 30 of 34 Table 11-1. Callaway Plant Release Category Frequency Results Obtained From SAMA Cases RELEASE CATEGORY         BASE   NOATWS     INSTAIR   NOLOSP   NOSLOCA       CCW01     FW01   NOSGTR     NOSLB     CHG01 LERF-IS         1.730E-07 1.730E-07 1.730E-07 1.730E-07   1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 LERF-CI         1.658E-10 1.411E-10 1.658E-10 1.422E-10   6.210E-11 1.567E-10 1.658E-10 1.658E-10 1.610E-10 1.658E-10 LERF-CF         1.125E-08 1.103E-08 1.124E-08 7.372E-09   5.378E-09 1.071E-08 1.115E-08 1.135E-08 1.116E-08 1.123E-08 LERF-SG         2.331E-06 2.306E-06 2.330E-06 2.331E-06   2.331E-06 2.331E-06 2.331E-06 0.000E+00 2.331E-06 2.331E-06 LERF-ITR         2.170E-07 1.845E-07 2.167E-07 1.309E-07   2.072E-07 2.170E-07 2.052E-07 0.000E+00 1.936E-07 2.169E-07 LATE-BMT         2.551E-06 2.268E-06 2.547E-06 1.254E-07   2.022E-06 2.507E-06 2.448E-06 2.626E-06 2.515E-06 2.467E-06 LATE-COP         3.185E-06 3.185E-06 3.185E-06 1.796E-08   3.170E-06 3.185E-06 3.185E-06 2.234E-06 3.185E-06 3.185E-06 SERF             0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 INTACT           8.080E-06 8.075E-06 8.080E-06 7.065E-06   2.540E-06 7.573E-06 7.983E-06 8.119E-06 7.773E-06 8.137E-06 TOTAL           1.655E-05 1.620E-05 1.654E-05 9.851E-06   1.045E-05 1.600E-05 1.634E-05 1.316E-05 1.618E-05 1.652E-05 Table 11-1. Callaway Plant Release Category Frequency Results Obtained From SAMA Cases (Cont.)
ULNRC-05919 October 17, 2012 Page 30 of 34 Table 11-1. Callaway Plant Release Category Frequency Results Obtained From SAMA Cases RELEASE CATEGORY BASE NOATWS INSTAIR NOLOSP NOSLOCA CCW01 FW01 NOSGTR NOSLB CHG01 LERF-IS 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 LERF-CI 1.658E-10 1.411E-10 1.658E-10 1.422E-10 6.210E-11 1.567E-10 1.658E-10 1.658E-10 1.610E-10 1.658E-10 LERF-CF 1.125E-08 1.103E-08 1.124E-08 7.372E-09 5.378E-09 1.071E-08 1.115E-08 1.135E-08 1.116E-08 1.123E-08 LERF-SG 2.331E-06 2.306E-06 2.330E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 0.000E+00 2.331E-06 2.331E-06 LERF-ITR 2.170E-07 1.845E-07 2.167E-07 1.309E-07 2.072E-07 2.170E-07 2.052E-07 0.000E+00 1.936E-07 2.169E-07 LATE-BMT 2.551E-06 2.268E-06 2.547E-06 1.254E-07 2.022E-06 2.507E-06 2.448E-06 2.626E-06 2.515E-06 2.467E-06 LATE-COP 3.185E-06 3.185E-06 3.185E-06 1.796E-08 3.170E-06 3.185E-06 3.185E-06 2.234E-06 3.185E-06 3.185E-06 SERF 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 INTACT 8.080E-06 8.075E-06 8.080E-06 7.065E-06 2.540E-06 7.573E-06 7.983E-06 8.119E-06 7.773E-06 8.137E-06 TOTAL 1.655E-05 1.620E-05 1.654E-05 9.851E-06 1.045E-05 1.600E-05 1.634E-05 1.316E-05 1.618E-05 1.652E-05 Table 11-1. Callaway Plant Release Category Frequency Results Obtained From SAMA Cases (Cont.)
RELEASE CATEGORY         SW01     NOSBO     LOCA05   H2BURN   RCPLOCA     LOCA 12     CONT02   LOCA04     LOCA03   CONT01 LERF-IS         1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07   1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 LERF-CI         1.658E-10 1.658E-10 6.210E-11 1.658E-10 1.567E-10   1.658E-10 0.000E+00 1.658E-10 1.658E-10 1.658E-10 LERF-CF         1.124E-08 1.030E-08 5.018E-09 4.102E-12 1.048E-08   1.099E-08 1.125E-08 1.114E-08 1.089E-08 1.125E-08 LERF-SG         2.331E-06 2.329E-06 2.331E-06 2.331E-06 2.331E-06   2.331E-06 2.331E-06 2.331E-06 2.298E-06 2.331E-06 LERF-ITR         2.170E-07 1.443E-07 2.072E-07 2.170E-07 2.170E-07   2.165E-07 2.170E-07 2.170E-07 2.169E-07 2.170E-07 LATE-BMT         2.553E-06 1.611E-06 2.009E-06 2.551E-06 2.475E-06   1.893E-06 2.551E-06 2.441E-06 2.007E-06 2.551E-06 LATE-COP         3.181E-06 2.426E-06 3.170E-06 3.170E-06 3.173E-06   3.182E-06 3.185E-06 3.185E-06 3.185E-06 0.000E+00 SERF             0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00   0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 INTACT           8.080E-06 7.883E-06 2.170E-06 8.080E-06 7.301E-06   8.329E-06 8.080E-06 8.080E-06 8.180E-06 8.080E-06 TOTAL           1.655E-05 1.458E-05 1.007E-05 1.652E-05 1.568E-05   1.614E-05 1.655E-05 1.644E-05 1.607E-05 1.336E-05
RELEASE CATEGORY SW01 NOSBO LOCA05 H2BURN RCPLOCA LOCA 12 CONT02 LOCA04 LOCA03 CONT01 LERF-IS 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 LERF-CI 1.658E-10 1.658E-10 6.210E-11 1.658E-10 1.567E-10 1.658E-10 0.000E+00 1.658E-10 1.658E-10 1.658E-10 LERF-CF 1.124E-08 1.030E-08 5.018E-09 4.102E-12 1.048E-08 1.099E-08 1.125E-08 1.114E-08 1.089E-08 1.125E-08 LERF-SG 2.331E-06 2.329E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 2.298E-06 2.331E-06 LERF-ITR 2.170E-07 1.443E-07 2.072E-07 2.170E-07 2.170E-07 2.165E-07 2.170E-07 2.170E-07 2.169E-07 2.170E-07 LATE-BMT 2.553E-06 1.611E-06 2.009E-06 2.551E-06 2.475E-06 1.893E-06 2.551E-06 2.441E-06 2.007E-06 2.551E-06 LATE-COP 3.181E-06 2.426E-06 3.170E-06 3.170E-06 3.173E-06 3.182E-06 3.185E-06 3.185E-06 3.185E-06 0.000E+00 SERF 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 INTACT 8.080E-06 7.883E-06 2.170E-06 8.080E-06 7.301E-06 8.329E-06 8.080E-06 8.080E-06 8.180E-06 8.080E-06 TOTAL 1.655E-05 1.458E-05 1.007E-05 1.652E-05 1.568E-05 1.614E-05 1.655E-05 1.644E-05 1.607E-05 1.336E-05  


ULNRC-05919 October 17, 2012                                                                 Page 31 of 34 Table 11-1. Callaway Plant Release Category Frequency Results Obtained From SAMA Cases RELEASE CATEGORY     BREAKER     DC01     SW02     CCW02     CST01     ISLOCA     LOSP1   DEPRESS   LOCA06     HVAC LERF-IS         1.730E-07 1.730E-07   1.730E-07 1.730E-07 1.730E-07 0.000E+00   1.730E-07 1.730E-07 1.730E-07 1.730E-07 LERF-CI         1.666E-10 1.658E-10   1.514E-10 1.422E-10 1.650E-10 1.658E-10   1.666E-10 1.658E-10 1.658E-10 1.658E-10 LERF-CF         1.129E-08 1.124E-08   9.088E-09 8.906E-09 1.112E-08 1.125E-08   1.113E-08 1.122E-08 1.109E-08 1.099E-08 LERF-SG         2.328E-06 2.331E-06   2.331E-06 2.331E-06 2.331E-06 2.331E-06   2.331E-06 2.331E-06 2.331E-06 2.329E-06 LERF-ITR       2.093E-07 2.170E-07   2.013E-07 2.108E-07 2.169E-07 2.170E-07   1.814E-07 2.160E-07 2.169E-07 1.944E-07 LATE-BMT       2.047E-06 2.551E-06   2.213E-06 1.864E-06 2.022E-06 2.551E-06   2.039E-06 2.508E-06 2.020E-06 1.657E-06 LATE-COP       3.210E-06 3.185E-06   8.964E-07 1.455E-06 3.185E-06 3.185E-06   2.991E-06 3.166E-06 3.185E-06 2.917E-06 SERF           0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00   0.000E+00 0.000E+00 0.000E+00 0.000E+00 INTACT         8.180E-06 8.080E-06   7.898E-06 7.836E-06 8.471E-06 8.080E-06   8.431E-06 8.069E-06 8.431E-06 8.312E-06 TOTAL           1.616E-05 1.655E-05   1.372E-05 1.388E-05 1.641E-05 1.638E-05   1.616E-05 1.647E-05 1.637E-05 1.559E-05
ULNRC-05919 October 17, 2012 Page 31 of 34 Table 11-1. Callaway Plant Release Category Frequency Results Obtained From SAMA Cases RELEASE CATEGORY BREAKER DC01 SW02 CCW02 CST01 ISLOCA LOSP1 DEPRESS LOCA06 HVAC LERF-IS 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 0.000E+00 1.730E-07 1.730E-07 1.730E-07 1.730E-07 LERF-CI 1.666E-10 1.658E-10 1.514E-10 1.422E-10 1.650E-10 1.658E-10 1.666E-10 1.658E-10 1.658E-10 1.658E-10 LERF-CF 1.129E-08 1.124E-08 9.088E-09 8.906E-09 1.112E-08 1.125E-08 1.113E-08 1.122E-08 1.109E-08 1.099E-08 LERF-SG 2.328E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 2.329E-06 LERF-ITR 2.093E-07 2.170E-07 2.013E-07 2.108E-07 2.169E-07 2.170E-07 1.814E-07 2.160E-07 2.169E-07 1.944E-07 LATE-BMT 2.047E-06 2.551E-06 2.213E-06 1.864E-06 2.022E-06 2.551E-06 2.039E-06 2.508E-06 2.020E-06 1.657E-06 LATE-COP 3.210E-06 3.185E-06 8.964E-07 1.455E-06 3.185E-06 3.185E-06 2.991E-06 3.166E-06 3.185E-06 2.917E-06 SERF 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 INTACT 8.180E-06 8.080E-06 7.898E-06 7.836E-06 8.471E-06 8.080E-06 8.431E-06 8.069E-06 8.431E-06 8.312E-06 TOTAL 1.616E-05 1.655E-05 1.372E-05 1.388E-05 1.641E-05 1.638E-05 1.616E-05 1.647E-05 1.637E-05 1.559E-05  


ULNRC-05919 October 17, 2012                                                                 Page 32 of 34 Table 11-1. Callaway Plant Release Category Frequency Results Obtained From SAMA Cases RELEASE CATEGORY   FB01       PORV       EDGFUEL   FW02       SW03       HVAC02     RAI7a     SLIS       HEP       FWCCW2 LERF-IS     1.730E-07 1.730E-07 1.730E-10 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 LERF-CI     1.658E-10 1.658E-10 1.658E-10 1.658E-10 1.514E-10 1.658E-10 1.658E-10 1.658E-10 1.658E-10 1.567E-10 LERF-CF     1.094E-08 1.112E-08 1.124E-08 1.047E-08 1.031E-08 1.096E-08 1.135E-08 1.123E-08 1.080E-08 1.048E-10 LERF-SG     2.326E-06 2.331E-06 2.331E-06 2.324E-06 2.331E-06 2.331E-06 2.331E-06 2.290E-06 2.329E-06 2.317E-06 LERF-ITR     1.796E-07 2.169E-07 2.169E-07 1.659E-07 2.141E-07 2.169E-07 7.508E-08 2.138E-07 2.170E-07 2.170E-07 LATE-BMT     2.006E-06 2.022E-06 2.544E-06 1.983E-06 2.428E-06 1.990E-06 2.631E-06 2.545E-06 2.523E-06 2.467E-06 LATE-COP     3.185E-06 3.185E-06 3.182E-06 3.185E-06 2.557E-06 2.823E-06 3.235E-06 3.185E-06 3.185E-06 3.174E-06 SERF         0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 INTACT       8.146E-06 8.471E-06 8.078E-06 7.796E-06 7.907E-06 8.461E-06 8.119E-06 8.036E-06 7.529E-06 7.311E-06 TOTAL       1.603E-05 1.641E-05 1.636E-05 1.564E-05 1.562E-05 1.601E-05 1.658E-05 1.645E-05 1.597E-05 1.566E-05
ULNRC-05919 October 17, 2012 Page 32 of 34 Table 11-1. Callaway Plant Release Category Frequency Results Obtained From SAMA Cases RELEASE CATEGORY FB01 PORV EDGFUEL FW02 SW03 HVAC02 RAI7a SLIS HEP FWCCW2 LERF-IS 1.730E-07 1.730E-07 1.730E-10 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 LERF-CI 1.658E-10 1.658E-10 1.658E-10 1.658E-10 1.514E-10 1.658E-10 1.658E-10 1.658E-10 1.658E-10 1.567E-10 LERF-CF 1.094E-08 1.112E-08 1.124E-08 1.047E-08 1.031E-08 1.096E-08 1.135E-08 1.123E-08 1.080E-08 1.048E-10 LERF-SG 2.326E-06 2.331E-06 2.331E-06 2.324E-06 2.331E-06 2.331E-06 2.331E-06 2.290E-06 2.329E-06 2.317E-06 LERF-ITR 1.796E-07 2.169E-07 2.169E-07 1.659E-07 2.141E-07 2.169E-07 7.508E-08 2.138E-07 2.170E-07 2.170E-07 LATE-BMT 2.006E-06 2.022E-06 2.544E-06 1.983E-06 2.428E-06 1.990E-06 2.631E-06 2.545E-06 2.523E-06 2.467E-06 LATE-COP 3.185E-06 3.185E-06 3.182E-06 3.185E-06 2.557E-06 2.823E-06 3.235E-06 3.185E-06 3.185E-06 3.174E-06 SERF 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 INTACT 8.146E-06 8.471E-06 8.078E-06 7.796E-06 7.907E-06 8.461E-06 8.119E-06 8.036E-06 7.529E-06 7.311E-06 TOTAL 1.603E-05 1.641E-05 1.636E-05 1.564E-05 1.562E-05 1.601E-05 1.658E-05 1.645E-05 1.597E-05 1.566E-05  


ULNRC-05919 October 17, 2012                                                                 Page 33 of 34 Table 11-1. Callaway Plant Release Category Frequency Results Obtained From SAMA Cases RELEASE CATEGORY   SBOMOD     SBOmod2   4kv2       FWCCW LERF-IS     1.730E-07 1.730E-07 1.730E-07 1.730E-07 LERF-CI     1.658E-10 1.658E-10 1.658E-10 1.658E-10 LERF-CF     1.102E-08 1.102E-08 1.124E-10 1.124E-08 LERF-SG     2.331E-06 2.331E-06 2.331E-06 2.331E-06 LERF-ITR   1.628E-07 1.603E-07 2.170E-07 2.170E-07 LATE-BMT   2.485E-06 2.482E-06 2.551E-06 2.551E-06 LATE-COP   2.668E-06 2.642E-06 3.156E-06 3.184E-06 SERF       0.000E+00 0.000E+00 0.000E+00 0.000E+00 INTACT     8.046E-06 8.044E-06 8.080E-06 8.078E-06 TOTAL       1.588E-05 1.584E-05 1.651E-05 1.655E-05
ULNRC-05919 October 17, 2012 Page 33 of 34 Table 11-1. Callaway Plant Release Category Frequency Results Obtained From SAMA Cases RELEASE CATEGORY SBOMOD SBOmod2 4kv2 FWCCW LERF-IS 1.730E-07 1.730E-07 1.730E-07 1.730E-07 LERF-CI 1.658E-10 1.658E-10 1.658E-10 1.658E-10 LERF-CF 1.102E-08 1.102E-08 1.124E-10 1.124E-08 LERF-SG 2.331E-06 2.331E-06 2.331E-06 2.331E-06 LERF-ITR 1.628E-07 1.603E-07 2.170E-07 2.170E-07 LATE-BMT 2.485E-06 2.482E-06 2.551E-06 2.551E-06 LATE-COP 2.668E-06 2.642E-06 3.156E-06 3.184E-06 SERF 0.000E+00 0.000E+00 0.000E+00 0.000E+00 INTACT 8.046E-06 8.044E-06 8.080E-06 8.078E-06 TOTAL 1.588E-05 1.584E-05 1.651E-05 1.655E-05  


ULNRC-05919 October 17, 2012                                                                         Page 34 of 34 RAI 7.b:
ULNRC-05919 October 17, 2012 Page 34 of 34 RAI 7.b:
SAMA 64 (implement procedure and hardware modifications to allow manual alignment of the fire water system to the component cooling water system, or install a component cooling water header cross-tie) is evaluated by eliminating CCW pump failures. Consider a similar SAMA that provides fire water to the ESW system.
SAMA 64 (implement procedure and hardware modifications to allow manual alignment of the fire water system to the component cooling water system, or install a component cooling water header cross-tie) is evaluated by eliminating CCW pump failures. Consider a similar SAMA that provides fire water to the ESW system.
Callaway Response SAMA 64 was revised to evaluate the benefit of a temporary hookup of fire water as backup on loss of CCW cooling to the RHR heat exchangers. This determined the benefit to be $104K with a 95% CDF benefit of $220K. This SAMA is considered potentially cost beneficial and has been added to the list of potentially cost beneficial SAMAs.
Callaway Response SAMA 64 was revised to evaluate the benefit of a temporary hookup of fire water as backup on loss of CCW cooling to the RHR heat exchangers. This determined the benefit to be $104K with a 95% CDF benefit of $220K. This SAMA is considered potentially cost beneficial and has been added to the list of potentially cost beneficial SAMAs.

Latest revision as of 21:57, 11 January 2025

License Renewal Application, Request for Additional Information to Items 5D, 7A, 7B, Tables 7-1, 8-1, 9-1, and 11-1
ML12292A404
Person / Time
Site: Callaway Ameren icon.png
Issue date: 10/17/2012
From:
Ameren Missouri
To:
Office of Nuclear Reactor Regulation
Shared Package
ML122920434 List:
References
Download: ML12292A404 (34)
v • d • e


Text

ULNRC-05919 October 17, 2012 Page 1 of 34 CALLAWAY PLANT UNIT 1 LICENSE RENEWAL APPLICATION REQUEST FOR ADDITIONAL INFORMATION (RAI) RESPONSE TO ITEMS 5D, 7A, 7B, TABLES 7-1, 8-1, 9-1, AND 11-1

ULNRC-05919 October 17, 2012 Page 2 of 34 RAI 5.d:

Note 1 to Table F.3-2 states, "The current plant procedures and training meet current industry standards. There are no additional specific procedure improvements that could be identified that would affect the result of the human error probability (HEP) calculations. Therefore, no SAMA items were added to the plant specific list of SAMAs as a result of the human actions on the list of basic events with RRW greater than 1.005." This appears to imply that meeting current industry standards is sufficient to indicate that no additional SAMAs are needed.

i. Provide additional information to justify the conclusion stated as indicated above.

ii. Explain the process used to make the determination that there are no opportunities to improve procedures and training. Include in the explanation how human error probability factors were considered (e.g., cognition, resources, timing, and stress level).

iii. Discuss whether any of the risk significant operator action failures could be addressed by options other than training or procedures such as automated functions, testing, and maintenance to reduce failure or event rates, or enhanced documentation. Specifically discuss the potential for automating the function associated with basic event OP-XHE-FO-CCWRHX (OPERATOR FAILS TO INITIATE CCW FLOW TO THE RHR HXS) identified in Table 3-2.

Callaway Response In order to perform a cost/benefit analysis of any change, the impact on the calculated Human Error Probability must be determined. Discussion with the HRA analysts indicate that based on the current structure and format of the existing procedures, any incremental improvements or changes made to training or procedures would not result in the ability to take additional credit in the HRA because in general full credit is already taken. Improvements may be possible through re-ordering steps in the EOP network to improve timing, however, since Callaway uses the standardized EOP network significant changes in EOP structure would result in compliance issues with EOP configuration control. The current standardized EOP structure is based on the deterministic safety analysis, not a PRA analysis, thus while there may be PRA improvements there are significant analysis and infrastructure changes that would have to be implemented Industry-wide to change the standardized structure. Any enhancements that could be made within the standardized structure have either already been made at Callaway or would not result in additional significant credit in the HEP determination. With no significant change to the HEP, the benefit of making the change would be negligible.

The note was not intended to state that no opportunities for improvement exist, rather that there would be no calculated dollar value benefit from any improvements made. Plant personnel are always encouraged to use the corrective action process to identify potential improvements. In addition, the PRA group reviews and actively participates in changes made to Operating Procedures to evaluate impact on the PRA as well as suggest improvements.

ULNRC-05919 October 17, 2012 Page 3 of 34 In general, operator actions credited in the Level 1 PRA, are proceduralized in the EOP and OTO procedure network. The EOP/OTO procedures address both cognition and execution as follows:

x Cognition - specifically they identify the primary cue (instrumentation or alarm needed to make the diagnosis) x Execution - specifically they identify the tasks needed to accomplish the required action).

The EOP/OTO procedures are highly trained on both in the classroom and to the extent possible in the simulator or through job performance measures. All EOPs are required to be trained on at least once every six years. In general, most EOPS are trained on several times a year in both the simulator and class room training. There is a six week training cycle and each crew will spend one week in simulator and/or class room training during each six week cycle.

The trainers review the procedures regularly to identify areas where the training crews have encountered difficulty and update the procedures accordingly. EOP/OTO Writers manual APA-ZZ-00102 is the guidance document the procedure writers follow to ensure that the procedures are written to be consistent with industry standards.

As part of the HRA task the EOP and OTO procedures are reviewed to ensure that credited operator actions in the PRA are proceduralized in the same context as the EOPS/OTOs. The HRA task accounts for the following:

x Procedure Context -Does the procedure match the modeled PRA scenario, x

Procedure Structure - Response not obtained column format vs. paragraphs of instructions, x

Procedure Wording - Does the procedure wording have a double negative, x

Distinction of important steps (boxed, bulleted, bolded, etc),

x Time to reach the required procedure step.

If the HEP is dominated by a single failure mechanism such as an ambiguously worded statement or not enough time to reach the required procedure step, then these findings are passed back to the Callaway training department and procedure revisions are made within the limitations of standardized procedures, as applicable.

The Callaway training department maintains a listing of time critical deterministic and PRA risk significant actions in procedure APA-ZZ-00395. On a defined cycle, the deterministic operator actions are evaluated/validated in the simulator, including timing of events. There is considerable overlap in the deterministic operator actions and the PRA risk significant actions and timing information from these validations is used to evaluate the assumptions in the HRA.

This training identifies procedure ambiguities associated with the procedure guidance for most actions credited in the PRA. These completions times are not requirements but are intended to be nominal average estimates that most crews can achieve. Following the completion of a major PRA update APA-ZZ-00395 is updated.

As part of PRA Update 5, all Level 1 post-initiator operator actions were reviewed and updated to align with the current EOP/OTO procedure revisions and training. As part of this update, all

ULNRC-05919 October 17, 2012 Page 4 of 34 risk-significant scenarios were talked through with Callaway trainers and insights from recent simulator training were incorporated into the updated HRA.

The process followed for this HRA update was:

1. Identify - Each PRA scenario was reviewed in the context of the appropriate EOP to ensure that the as-operated plant is reflected in the HRA.
2. Define - As part of the definition a feasibility check was performed for each HFE. This included defining both a cognitive and execution procedure, identify the frequency and level of training, showing there is enough time to complete the action, and there are enough people available to perform all tasks associated with the initiating event.
3. Quantify - The HEP is quantified using the EPRI HRA approach which accounts for a combination of cognitive and execution performance shaping factors.
4. Uncertainty - The uncertainty is addressed both qualitatively and quantitatively in the HRA.

As part of the HRA update no procedure updates to improve the SAMA were identified.

A case was quantified to determine the benefit of automating the initiation of CCW flow to the RHR heat exchangers. This case was evaluated by setting the value of basic event OP-XHE-FO-CCWRHX to 0.0. The benefit of this modification was determined to be $62K with the 95% CDF benefit being $132K. This modification was judged to be not cost beneficial be potentially cost-beneficial with an estimated cost of $200K.

The cost of adding hardware systems to automatically perform the actions represented by important human actions is high. This cost has been shown in a number of SAMA submittals to sometimes be order(s) of magnitude higher than the benefit achieved.

Other non-procedural changes such as additional maintenance and testing would not necessarily reduce risk significant human errors. Most equipment related failures are induced by human errors during testing or maintenance. The benefits of increasing the occurrence of tests and maintenance diminish at the point where additional maintenance or restoration errors are introduced or at the point where undue wear and tear occurs. Callaway's maintenance and testing program uses vendor recommended test and maintenance intervals as well as operating experience in an attempt to optimize mechanical reliability. Randomly increasing test and maintenance over the recommended intervals is perceived to have no mechanical reliability benefit; but would pose an increase in maintenance and restoration errors as well as wear and tear.

Corresponding Amendment Changes No changes to the License Renewal Application (LRA) are needed as a result of this response.

ULNRC-05919 October 17, 2012 Page 5 of 34 RAI 7.a:

A note at the end of Table F.5-1 indicates that recent industry submittals of like-kind plants (i.e.,

Wolf Creek, South Texas, Diablo Canyon, and Seabrook) were used as a source of candidate SAMAs. The extent to which these submittals were examined is not clear, as only two SAMA candidates were identified in Table F.5-1 as being from these sources (I.e., SAMA 162 and 165). Also, it appears that a cost beneficial SAMA identified in the Diablo Canyon submittal might represent an unevaluated SAMA candidate for Callaway (Le., SAMA 24 -Prevent clearing of RCS cold leg water seals). Describe the extent to which the four cited SAMA submittals were used as sources to generate candidate SAMAs and evaluate each SAMA determined to be cost beneficial in those submittals or show how they could be screened out using criteria presented in ER Section F.6.0. If the SAMA review for a submittal has been completed, use the cost beneficial SAMAs as reported in the respective site specific volume of NUREG-1437, "Generic Environmental Impact Statement for License Renewal of Nuclear Plants."

Callaway Response This entire 7.a response is provided by this transmittal and was not part of Reference 3.

The SAMA section of the Environmental Report for each of the listed submittals was reviewed.

The site specific volume of NUREG-1437 was reviewed for those plants where one was available. For each SAMA item the descriptions and decisions of the cost/benefit analysis were reviewed for applicability and site specific cost/benefit to Callaway. The tables below show the Callaway disposition for each plant's potentially cost beneficial SAMAs.

Wolf Creek SAMA Description Callaway Disposition SAMA 2: Modify controls and operating procedures to permit the diesel generators at the Sharpe Station to be more rapidly aligned to the WCGS emergency buses in SBO events.

The Callaway AEPS design already maintains constant AC power up to the safety related/non-safety related separation breakers with the breaker controls located in the main control room. The AEPS diesel generators automatically start and supply AC power up to the separation breakers on loss of the normal supply; and, if required, the manual diesel controls are also located in the main control room.

SAMA 4: Proceduralize operator actions to perform local isolations of any valves that fail to close remotely in an interfacing system LOCA.

Callaway procedure ECA-1.2 contains direction for operators to manually close all valves in ISLOCA pathways that are located outside containment if the valves cannot be closed from the control room.

ULNRC-05919 October 17, 2012 Page 6 of 34 SAMA 5: Modify procedures to open emergency diesel generator room doors to provide alternate room cooling given failure of the heating ventilation and air-conditioning (HVAC) supply fan.

SAMA 80 has been modified to indicate that procedural guidance to open doors or provide alternate ventilation following loss of EDG HVAC is potentially cost beneficial.

SAMA 1: Install a permanent, dedicated generator for the NCP in order to provide RCP seal cooling in SBO events.

SAMA 187 has been added. AEPS was installed with a spare breaker that could be used to supply the NCP. This SAMA is considered potentially cost beneficial.

SAMA 3: Provide the capability to cross-tie between 4-kilovolts (kV) AC buses in the event of a loss of power to one bus.

This SAMA was evaluated using case 4KV2 and was determined to have a benefit of $13K with a 95% CDF benefit of $27K. Callaway SAMA 11 has been modified to consider this SAMA to be potentially cost beneficial. A physical cross-tie exists, but there is no analysis or procedures to allow its use except in specific conditions with offsite power available. Associated Costs are to develop procedures and analysis to allow use of the cross-tie with the Emergency Diesel Generators. The SAMA is already evaluated as potentially cost beneficial; however, it should be noted that the calculated benefit is somewhat under-estimated since it was evaluated only for SBO sequences.

SAMA 13: Install an alternative fuel oil tank with gravity feed capability to address fuel oil transfer failure events.

This SAMA is included as Callaway SAMA 162 and has been determined to be potentially cost beneficial.

SAMA 14: Install a permanent, dedicated generator for the NCP, and a motor-driven AFW pump and battery charger to address SBO events in which the TD AFW pump is unavailable.

SAMA 188 has been added. This SAMA was evaluated using case SBOMOD2 and was determined to have a benefit of $182K with a 95% CDF benefit of $385K. AEPS was installed with a spare breaker and expansion capability which could be used to supply various equipment. This SAMA is considered potentially cost beneficial.

Case SBOMOD This SAMA case was analyzed by multiplying the frequency of all SBO sequences by 1.0E-01 which represents the total failure probability of the operator errors and hardware failures associated with operation of the equipment that would be made available due to this modification.

No changes were made to support system modeling.

ULNRC-05919 October 17, 2012 Page 7 of 34 Case SBOMOD2 This SAMA case was analyzed by multiplying the frequency of all SBO sequences by 5.0E-02 which represents the total failure probability of the operator errors and hardware failures associated with operation of the equipment that would be made available due to this modification. No changes were made to support system modeling.

Case 4KV2 This SAMA case was analyzed by modifying the fault trees to include a cross-tie to the other 4KV AC bus and diesel generator. Only SBO sequences were solved and the results combined with the remainder of the baseline model results. The probability of failure for the cross-tie was assigned a probability of 5.0E-02. The cross-tie failure event was removed from cutsets containing the failures of both EDGs (including those caused by support equipment). No changes were made to support system modeling. The calculated benefit under-estimates the actual benefit since the benefit was only determined for SBO sequences. The benefit for other sequences could not be determined without extensive modifications to the PRA model.

The low benefit of this SAMA is attributed to the AEPS AC power supply that can be controlled from the main control room and the ability to have AEPS aligned to either 4KV bus and the ability to use the non-safety auxiliary feed pump.

Seabrook SAMA Description Callaway Disposition SAMA 157: Provide independent AC power source for battery chargers This item is considered implemented at Callaway. Procedures and equipment exist that will provide temporary portable power sources for the battery chargers.

SAMA 165: RWST fill from firewater during containment injectionModify 6 inch RWST flush flange to have a 21/2-inch female fire hose adapter with isolation valve This item is considered implemented at Callaway. Procedures and equipment exist to connect fire water to the RWST.

SAMA 192: Install a globe valve or flow limiting orifice upstream in the fire protection system This item is considered to be N/A for Callaway.

This is a plant specific internal flooding issue that was not identified for Callaway.

SAMA 193: Hardware change to eliminate MOV AC power dependency This item is considered to be N/A for Callaway.

This is a plant specific PRA importance issue that was not identified for Callaway.

ULNRC-05919 October 17, 2012 Page 8 of 34 South Texas Project South Texas Project has no potentially cost beneficial SAMA items.

Diablo Canyon SAMA Description Callaway Disposition SAMA 12: Improve Fire Barriers for ASW and CCW Equipment in the Cable Spreading Room This item is considered to be N/A for Callaway.

This is a plant specific fire related issue that was not identified for Callaway.

SAMA 13: Improve Cable Wrap for the PORVs in the Cable Spreading Room This item is considered to be N/A for Callaway.

This is a plant specific fire related issue that was not identified for Callaway.

SAMA 24: Prevent Clearing of RCS Cold Leg Water Seals This SAMA is included as Callaway SAMA 179 and has been determined to be potentially cost beneficial.

SAMA 25: Fill or Maintain Filled The Steam Generators to Scrub Fission Products This item is considered implemented at Callaway. The Emergency Operating Procedures contain direction to maintain steam generator level above the tubes.

Also refer to Tables 7-1, 8-1, 9-1, and 11-1 which directly follow this response.

Corresponding Amendment Changes No changes to the License Renewal Application (LRA) are needed as a result of this response.

ULNRC-05919 October 17, 2012 Page 9 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion

% Red.

In CDF

% Red.

In OS Dose SAMA Case SAMA Case Description Benefit Cost

% Red IN OECR Cost Basis Evaluation Basis for Evaluation 1

Provide additional DC battery capacity.

Extended DC power availability during an SBO.

12.17% 10.87%

NOSBO No Station Blackout Events

$360K

>$1M 10.49%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

2 Replace lead-acid batteries with fuel cells.

Extended DC power availability during an SBO.

12.17% 10.87%

NOSBO No Station Blackout Events

$360K

>$1M 10.49%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

5 Provide DC bus cross-ties.

Improved availability of DC power system.

0.30%

0.00%

DC01 TDAFW no DC Dependency

$1K

>$199K 0.03%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

11 Improve 4.16-kV bus cross-tie ability.

Increased availability of on-site AC power.

0.26%

0.58%

4kv2 Add 4KV cross-tie capability for SBO sequences

$13K

<$100K 0.58%

Expert Panel Potentially Cost-Beneficial Physical cross-tie exists, but there is no analysis or procedures to allow its use except in specific outage conditions. Cost is to develop procedures and analysis to allow use of the cross-tie. Benefit calculated is under-estimated since it was evaluated for only SBO sequences.

15 Install tornado protection on gas turbine generator.

Increased availability of on-site AC power.

2.65%

4.35%

LOSP1 No tornado related LOSP

$91K

>$500K 3.38%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

24 Bury off-site power lines.

Improved off-site power reliability during severe weather.

40.66% 41.30% NOLOSP Eliminate all Loss of Offsite Power Events

$1.2M

>$3M 35.28%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

Previous SAMA submittals have estimated approximately $1M per mile.

25 Install an independent active or passive high pressure injection system.

Improved prevention of core melt sequences.

2.77%

0.00%

LOCA12 No failures of the charging or SI pumps

$48K

>$1M 0.35%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

26 Provide an additional high pressure injection pump with independent diesel.

Reduced frequency of core melt from small LOCA and SBO sequences.

2.77%

0.00%

LOCA12 No failures of the charging or SI pumps

$48K

>$1M 0.35%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

28 Add a diverse low pressure injection system.

Improved injection capability.

3.19%

2.17%

LOCA03 No failure of low pressure injection

$65K

>$1M 1.01%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

29 Provide capability for alternate injection via diesel-driven fire pump.

Improved injection capability.

Potentially Cost-Beneficial SAMA is judged to be low cost, but analysis is needed to determine impacts of injection of non-borated water to RCS.

Expert Panel judged this SAMA to be potentially cost-beneficial without determining an actual benefit or cost.

ULNRC-05919 October 17, 2012 Page 10 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion

% Red.

In CDF

% Red.

In OS Dose SAMA Case SAMA Case Description Benefit Cost

% Red IN OECR Cost Basis Evaluation Basis for Evaluation 39 Replace two of the four electric safety injection pumps with diesel-powered pumps.

Reduced common cause failure of the safety injection system. This SAMA was originally intended for the Westinghouse-CE System 80+, which has four trains of safety injection.

However, the intent of this SAMA is to provide diversity within the high-and l 2.77%

0.00%

LOCA12 No failures of the charging or SI pumps

$48K

>$1M 0.35%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

41 Create a reactor coolant depressurization system.

Allows low pressure emergency core cooling system injection in the event of small LOCA and high-pressure safety injection failure.

0.78%

0.00%

DEPRESS No failures of depressurization

$12K

>$500K 0.27%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

43 Add redundant DC control power for SW pumps.

Increased availability of SW.

0.30%

0.00%

SW01 Service Water Pumps not dependent on DC Power

$1K

>$100K 0.06%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

46 Add a service water pump.

Increased availability of cooling water.

17.60% 27.72%

SW02 No failures of ESW pumps

$636K

>$5M 23.26%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

54 Increase charging pump lube oil capacity.

Increased time before charging pump failure due to lube oil overheating in loss of cooling water sequences.

0.48%

0.00%

CHG01 Charging pumps not dependent on cooling water.

$4K

>$100K 0.06%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

55 Install an independent reactor coolant pump seal injection system, with dedicated diesel.

Reduced frequency of core damage from loss of component cooling water, service water, or station blackout.

5.54%

0.00%

RCPLOCA No RCP Seal LOCAs

$94K

>$1M 0.21%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

Previous investigation into installing such a system concluded that operators did not have sufficient time to place the system in service prior to seal damage.

56 Install an independent reactor coolant pump seal injection system, without dedicated diesel.

Reduced frequency of core damage from loss of component cooling water or service water, but not a station blackout.

5.54%

0.00%

RCPLOCA No RCP Seal LOCAs

$94K

>$500K 0.21%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

58 Install improved reactor coolant pump seals.

Reduced likelihood of reactor coolant pump seal LOCA.

5.54%

0.00%

RCPLOCA No RCP Seal LOCAs

$94K

>$3M 0.21%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

59 Install an additional component cooling water pump.

Reduced likelihood of loss of component cooling water leading to a reactor coolant pump seal LOCA.

3.61%

0.00%

CCW01 No failures of the CCW Pumps

$59K

>$1M 0.07%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

ULNRC-05919 October 17, 2012 Page 11 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion

% Red.

In CDF

% Red.

In OS Dose SAMA Case SAMA Case Description Benefit Cost

% Red IN OECR Cost Basis Evaluation Basis for Evaluation 64 Implement procedure and hardware modifications to allow manual alignment of the fire water system to the component cooling water system, or install a component cooling water header cross-tie.

Improved ability to cool residual heat removal heat exchangers.

5.39%

0.76%

FWCCW 2

Evaluate fire water hookup to RHR HX

$104K

<$150K 0.77%%

Expert Panel Potentially Cost Beneficial The cost estimate is for development of a procedure and use of temporary connections.

Cost of permanent modification would be significantly higher.

65 Install a digital feed water upgrade.

Reduced chance of loss of main feed water following a plant trip.

1.57%

0.00%

FW01 No loss of Feedwater Events

$29K

$19M 0.49%

Callaway Modification Costs Not Cost-Beneficial Cost will exceed benefit.

71 Install a new condensate storage tank (auxiliary feedwater storage tank).

Increased availability of the auxiliary feedwater system.

1.14%

0.00%

CST01 CST does not deplete

$18K

>$2.5M 0.24%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

77 Provide a passive, secondary-side heat-rejection loop consisting of a condenser and heat sink.

Reduced potential for core damage due to loss-of-feedwater events.

1.57%

0.00%

FW01 No loss of Feedwater Events

$29K

$>1M 0.49%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

79 Replace existing pilot-operated relief valves with larger ones, such that only one is required for successful feed and bleed.

Increased probability of successful feed and bleed.

3.43%

2.17%

FB01 Only one PORV required for Feed &

Bleed

$79K

>$500K 1.68%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

80 Provide a redundant train or means of ventilation.

Increased availability of components dependent on room cooling.

6.08%

4.35%

HVAC No dependencies on HVAC

$156K

<$100K 3.87%

Expert Panel Potentially Cost Beneficial Procedures to open doors or provide temporary ventilation may be cost beneficial for the EDGs, MDAFW pumps, and charging pumps.

Procedures for opening doors to the DC switchgear rooms exist.

87 Replace service and instrument air compressors with more reliable compressors which have self-contained air cooling by shaft driven fans.

Elimination of instrument air system dependence on service water cooling.

0.36%

0.00%

INSTAIR Eliminate all instrument air failures

$2K

>$500K 0.06%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

91 Install a passive containment spray system.

Improved containment spray capability.

19.52% 36.96% CONT01 No failures due to containment overpressure

$793K

>$10M 31.32%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

93 Install an unfiltered, hardened containment vent.

Increased decay heat removal capability for non-ATWS events, without scrubbing released fission products.

19.52% 36.96% CONT01 No failures due to containment overpressure

$793K

>$2M 31.32%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

94 Install a filtered containment vent to remove decay heat.

Option 1: Gravel Bed Filter; Option 2: Multiple Venturi Scrubber Increased decay heat removal capability for non-ATWS events, with scrubbing of released fission products.

19.52% 36.96% CONT01 No failures due to containment overpressure

$793K

>$2M 31.32%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

ULNRC-05919 October 17, 2012 Page 12 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion

% Red.

In CDF

% Red.

In OS Dose SAMA Case SAMA Case Description Benefit Cost

% Red IN OECR Cost Basis Evaluation Basis for Evaluation 96 Provide post-accident containment inerting capability.

Reduced likelihood of hydrogen and carbon monoxide gas combustion.

0.48%

0.00%

H2BURN No hydrogen burns/explosions

$10K

>$100K 0.44%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

97 Create a large concrete crucible with heat removal potential to contain molten core debris.

Increased cooling and containment of molten core debris. Molten core debris escaping from the vessel is contained within the crucible and a water cooling mechanism cools the molten core in the crucible, preventing melt-through of the base mat.

MAB

>$10M Note 1 Expert Panel Not Cost-Beneficial Cost will exceed benefit.

98 Create a core melt source reduction system.

Increased cooling and containment of molten core debris. Refractory material would be placed underneath the reactor vessel such that a molten core falling on the material would melt and combine with the material.

Subsequent spreading and heat removal from the vitrified compound would be facilitated, and concrete attack would not occur.

MAB

>$10M Note 1 Expert Panel Not Cost-Beneficial Cost will exceed benefit.

99 Strengthen primary/secondary containment (e.g., add ribbing to containment shell).

Reduced probability of containment over-pressurization.

19.52% 36.96% CONT01 No failures due to containment overpressure

$1.2M

>$10M 31.32%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

100 Increase depth of the concrete base mat or use an alternate concrete material to ensure melt-through does not occur.

Reduced probability of base mat melt-through.

MAB

>$10M Note 1 Expert Panel Not Cost-Beneficial Cost will exceed benefit.

102 Construct a building to be connected to primary/secondary containment and maintained at a vacuum.

Reduced probability of containment over-pressurization.

19.52% 36.96% CONT01 No failures due to containment overpressure

$1.2M

>$10M 31.32%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

104 Improve leak detection procedures.

Increased piping surveillance to identify leaks prior to complete failure. Improved leak detection would reduce LOCA frequency.

39.34%

2.17%

LOCA05 No piping system LOCAs

$689K

>$2M 1.03%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

107 Install a redundant containment spray system.

Increased containment heat removal ability.

19.52% 36.96% CONT01 No failures due to containment overpressure

$1.2M

>$2M 31.32%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

ULNRC-05919 October 17, 2012 Page 13 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion

% Red.

In CDF

% Red.

In OS Dose SAMA Case SAMA Case Description Benefit Cost

% Red IN OECR Cost Basis Evaluation Basis for Evaluation 108 Install an independent power supply to the hydrogen control system using either new batteries, a non-safety grade portable generator, existing station batteries, or existing AC/DC independent power supplies, such as the security system diesel.

Reduced hydrogen detonation potential.

0.48%

0.00%

H2BURN No hydrogen burns/explosions

$10K

>$100K 0.44%

Expert Panel Not Cost-Beneficial 109 Install a passive hydrogen control system.

Reduced hydrogen detonation potential.

0.48%

0.00%

H2BURN No hydrogen burns/explosions

$10K

>$100M 0.44%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

110 Erect a barrier that would provide enhanced protection of the containment walls (shell) from ejected core debris following a core melt scenario at high pressure.

Reduced probability of containment failure.

MAB

>$10M Note 1 Expert Panel Not Cost-Beneficial Cost will exceed benefit.

111 Install additional pressure or leak monitoring instruments for detection of ISLOCAs.

Reduced ISLOCA frequency.

1.33%

8.70%

ISLOCA No ISLOCA events

$123K

>$500K 7.08%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

112 Add redundant and diverse limit switches to each containment isolation valve.

Reduced frequency of containment isolation failure and ISLOCAs.

0.30%

0.00%

CONT02 No failures of containment isolation

$1K

>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

113 Increase leak testing of valves in ISLOCA paths.

Reduced ISLOCA frequency.

1.33%

8.70%

ISLOCA No ISLOCA events

$123K

>$1M 7.08%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

114 Install self-actuating containment isolation valves.

Reduced frequency of isolation failure.

0.30%

0.00%

CONT02 No failures of containment isolation

$1K

>$500K 0.03%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

115 Locate residual heat removal (RHR) inside containment Reduced frequency of ISLOCA outside containment.

1.33%

8.70%

ISLOCA No ISLOCA events

$123K

>$1M 7.08%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

116 Ensure ISLOCA releases are scrubbed. One method is to plug drains in potential break areas so that break point will be covered with water.

Scrubbed ISLOCA releases.

1.33%

8.70%

ISLOCA No ISLOCA events

$123K

>$1M 7.08%

Expert Panel Not Cost-Beneficial Cost would exceed benefit.

Current plant design requires drains to be open.

Analysis and license changes required to implement are included in the cost estimate.

119 Institute a maintenance practice to perform a 100%

inspection of steam generator tubes during each refueling outage.

Reduced frequency of steam generator tube ruptures.

20.47%

63.28% NOSGTR No SGTR Events

$1.4M

>$3M 69.43%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

121 Increase the pressure capacity of the secondary side so that a steam generator tube rupture would not cause the relief valves to lift.

Eliminates release pathway to the environment following a steam generator tube rupture.

20.47%

63.28% NOSGTR No SGTR Events

$1.4M

>$10M 69.43%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

ULNRC-05919 October 17, 2012 Page 14 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion

% Red.

In CDF

% Red.

In OS Dose SAMA Case SAMA Case Description Benefit Cost

% Red IN OECR Cost Basis Evaluation Basis for Evaluation 122 Install a redundant spray system to depressurize the primary system during a steam generator tube rupture Enhanced depressurization capabilities during steam generator tube rupture.

20.47%

63.28% NOSGTR No SGTR Events

$1.4M

>$10M 69.43%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

125 Route the discharge from the main steam safety valves through a structure where a water spray would condense the steam and remove most of the fission products.

Reduced consequences of a steam generator tube rupture.

20.47%

63.28% NOSGTR No SGTR Events

$1.4M

>$10M 69.43%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

126 Install a highly reliable (closed loop) steam generator shell-side heat removal system that relies on natural circulation and stored water sources Reduced consequences of a steam generator tube rupture.

20.47%

63.28% NOSGTR No SGTR Events

$1.4M

>$10M 69.43%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

129 Vent main steam safety valves in containment.

Reduced consequences of a steam generator tube rupture.

20.47%

63.28% NOSGTR No SGTR Events

$1.4M

>$10M 69.43%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

Current containment design does not support this modification.

Modifications to containment and associated analysis are included in the cost estimate.

130 Add an independent boron injection system.

Improved availability of boron injection during ATWS.

2.41%

2.17%

NOATWS Eliminate all ATWS

$63K

>$1M 1.85%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

131 Add a system of relief valves to prevent equipment damage from pressure spikes during an ATWS.

Improved equipment availability after an ATWS.

2.41%

2.17%

NOATWS Eliminate all ATWS

$63K

>$2M 1.85%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

133 Install an ATWS sized filtered containment vent to remove decay heat.

Increased ability to remove reactor heat from ATWS events.

2.41%

2.17%

NOATWS Eliminate all ATWS

$63K

>$1M 1.85%

Expert Panel Not Cost-Beneficial Cost will exceed benefit 136 Install motor generator set trip breakers in control room.

Reduced frequency of core damage due to an ATWS.

2.41%

2.17%

NOATWS Eliminate all ATWS

$63K

>$500K 1.85%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

147 Install digital large break LOCA protection system.

Reduced probability of a large break LOCA (a leak before break).

39.34%

2.17%

LOCA05 No piping system LOCAs

$689K

>$5M 1.03%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

153 Install secondary side guard pipes up to the main steam isolation valves.

Prevents secondary side depressurization should a steam line break occur upstream of the main steam isolation valves.

Also guards against or prevents consequential multiple steam generator tube ruptures following a main steam line break event.

2.53%

0.00%

NOSLB No Steam Line Breaks

$51K

>$1M 0.87%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

ULNRC-05919 October 17, 2012 Page 15 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion

% Red.

In CDF

% Red.

In OS Dose SAMA Case SAMA Case Description Benefit Cost

% Red IN OECR Cost Basis Evaluation Basis for Evaluation 160 Modifications to lessen impact of internal flooding path through Control Building dumbwaiter.

Lower impact of flood that propagates through the dumbwaiter

<$50K Expert Panel Potentially Cost-Beneficial Relatively minor modifications to door opening could result in lower flow to the dumbwaiter. Specific benefit could not be calculated but SAMA item is judged to be low cost and therefore potentially cost beneficial.

161 Improvements to PORV performance that will lower the probability of failure to open.

Decrease in risk due to PORV failing to open.

0.85%

0.46%

PORV PORVs do not fail to open

$18K

>$100K 0.24%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

162 Install a large volume EDG fuel oil tank at an elevation greater than the EDG fuel oil day tanks.

Allows transfer of EDF fuel oil to the EDG day tanks on failure of the fuel oil transfer pumps.

1.14%

7.60%

EDGFUEL No EDG fuel pump failures

$124K

$150K 7.11%

Wolf Creek Potentially Cost-Beneficial Wolf Creek estimated cost of $150K is less than the potential benefit.

163 Improve feedwater check valve reliability to reduce probability of failure to open.

Lower risk due to failures in which feedwater check valves fail to open and allow feeding of the steam generators.

5.52%

2.05%

FW02 Feedwater Check Valves do not fail to open

$127K

>$500K 2.23%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

164 Provide the capability to power the normal service water pumps from AEPS.

Provide backup to ESW in conditions with power only available from AEPS.

5.62%

7.64%

SW03 AEPS power to SW pumps

$191K

>$500K 6.37%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

171 Increase the size of the RWST or otherwise improve the availability of the RWST Ensure a supply of makeup water is available from the RWST.

0.68%

0.13%

LOCA04 RWST does not deplete

$13K

>$100K 0.07%

Expert Panel Not Cost-Beneficial Cost will exceed benefit.

178 Improvements to UHS cooling tower electrical room HVAC.

Improve availability or mitigate loss of HVAC.

3.29%

4.75%

HVAC02 UHS cooling tower electrical room HVAC does not fail.

$113K

<$100K 3.82%

Expert Panel Potentially Cost Beneficial Implementation of temporary ventilation or opening of doors will be a lower cost than the calculated benefit.

179 Modify procedures such that the water loop seals in the RCS cold legs are not cleared following core damage.

Prevents possible thermally induced steam generator tube rupture following core damage.

0.15%

3.18%

RAI7a Reduced probability of thermally induced steam generator tube failure

$63K

<$100K 4.46%

Expert Panel Potentially Cost Beneficial Implementation of procedure change will be lower cost than benefit, especially if 95% CDF benefit is considered.

180 Install lower amperage fuses for various 14 AWG control circuits in the MCR. The majority of the modification centers around the trip circuit fuses on NB, NG, PA, PB, and PG system breakers.

Reduced fire risk.

Potentially Cost Beneficial SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.

ULNRC-05919 October 17, 2012 Page 16 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion

% Red.

In CDF

% Red.

In OS Dose SAMA Case SAMA Case Description Benefit Cost

% Red IN OECR Cost Basis Evaluation Basis for Evaluation 181 Install redundant fuses and isolation switches for MCR evacuation procedure OTO-ZZ-00001.

Reduced fire risk.

Potentially Cost Beneficial SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.

182 To protect against multiple spurious operation scenarios, cable runs will be changed to run a single wire in a protected metal jacket such that spurious valve opening due to a hot short affecting the valve control circuit is eliminated for the fire area.

This modification will be implemented in multiple fire areas.

Reduced fire risk.

Potentially Cost Beneficial SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.

183 Quick response sprinkler heads in cable chases A-11, C-30, and C-31 will be modified to be in accordance with the applicable requirements of NFPA 13-1976 edition.

Reduced fire risk.

Potentially Cost Beneficial SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.

184 Improvements in the reliability of the Steam Line Isolation automatic signal.

More reliable main steam line isolation.

0.59%

0.95%

SLIS Steam Line Isolation System does not fail

$28K

>$500K 1.06%

Expert Panel Not Cost-Beneficial Cost is for installation of redundant instrumentation system and would likely be much higher. Procedure and training already direct operators to manually back up failed automatic actuations.

185 Automate initiation of CCW flow to the RHR heat exchangers.

More reliable than manual initiation of flow to RHR HX.

3.53%

0.14%

HEP Evaluate automating CCW flow to RHR HXs

$62K

$200K 0.11%

Expert Panel Potentially Cost Beneficial 186 Develop a procedure and obtain equipment to provide a temporary hookup of fire water as a replacement for ESW Backup cooling water if ESW/SW is lost 0.04%

0.05%

FWCCW Fire water available to cool CCW HX

$1K

>$1M 0.04%

Expert Panel Not Cost-Beneficial Ability to do this will require larger fire pumps.

187 Install modification to power the normal charging pump from an existing spare breaker from the AEPS.

Another source of backup power to the NCP in cases of station blackout or loss of service water 4.07%

7.63%

SBOMOD Reduce the frequency of SBO sequences.

$174K

$350K 7.03%

Expert Panel Potentially Cost Beneficial Already installed spare circuit breaker, implementation requires power and control cables.

ULNRC-05919 October 17, 2012 Page 17 of 34 Table 7-1. Callaway Plant 1 Phase II SAMA Analysis Callaway SAMA Number Potential Improvement Discussion

% Red.

In CDF

% Red.

In OS Dose SAMA Case SAMA Case Description Benefit Cost

% Red IN OECR Cost Basis Evaluation Basis for Evaluation 188 Install a permanent, dedicated generator for the NCP, and a motor-driven AFW pump and battery charger to address SBO events in which the TD AFW pump is unavailable.

Another source of backup power to the NCP, DC power (pump/valve control and SG level instrumentation), and power to an AFW pump in cases of station blackout or loss of service water 4.28%

7.63%

SBOMOD2 Reduce the frequency of SBO sequences.

$182K

$400K 7.38%

Expert Panel Potentially Cost Beneficial AEPS was installed with a spare breaker and expansion capability that could be used to supply various equipment.

OS = off site Note 1: For SAMA items that were judged to cost significantly more than the Maximum Attainable Benefit (MAB), no calculation of the individual benefit was performed.

ULNRC-05919 October 17, 2012 Page 18 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway SAMA Number Potential Improvement Discussion SAMA Case Benefit Benefit at 3% Disc Rate Benefit at Realistic Disc Rate Benefit at 33yrs Benefit at 95%

CDF Cost Cost Basis Evaluation Basis for Evaluation 1

Provide additional DC battery capacity.

Extended DC power availability during an SBO.

NOSBO

$360K

$588K

$325K

$512K

$761K

>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

2 Replace lead-acid batteries with fuel cells.

Extended DC power availability during an SBO.

NOSBO

$360K

$588K

$325K

$512K

$761K

>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

5 Provide DC bus cross-ties.

Improved availability of DC power system.

DC01

$1K

$1K

$1K

$1K

$1K

>$199K Expert Panel Not Cost-Beneficial Cost will exceed benefit.

11 Improve 4.16-kV bus cross-tie ability. Increased availability of on-site AC power.

4kv2

$13K

$20K

$12K

$17K

$27K

<$100K Expert Panel Potentially Cost-Beneficial Physical cross-tie exists, but there is no analysis or procedures to allow its use except in specific outage conditions. Cost is to develop procedures and analysis to allow use of the cross-tie.

Benefit calculated is under-estimated since it was evaluated for only SBO sequences.

15 Install tornado protection on gas turbine generator.

Increased availability of on-site AC power.

LOSP1

$91K

$144K

$82K

$125K

$192K

>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.

24 Bury off-site power lines.

Improved off-site power reliability during severe weather.

NOLOSP

$1.2M

$2.0M

$1.1M

$1.7M

$2.6M

>$3M Expert Panel Not Cost-Beneficial Cost will exceed benefit. Previous SAMA submittals have estimated approximately $1M per mile.

25 Install an independent active or passive high pressure injection system.

Improved prevention of core melt sequences.

LOCA12

$48K

$85K

$44K

$75

$102

>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

26 Provide an additional high pressure injection pump with independent diesel.

Reduced frequency of core melt from small LOCA and SBO sequences.

LOCA12

$48K

$85K

$44K

$75

$102

>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

28 Add a diverse low pressure injection system.

Improved injection capability.

LOCA03

$65K

$111K

$58K

$97K

$137K

>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

29 Provide capability for alternate injection via diesel-driven fire pump.

Improved injection capability.

Potentially Cost-Beneficial SAMA is judged to be low cost, but analysis is needed to determine impacts of injection of non-borated water to RCS.

Expert Panel judged this SAMA to be potentially cost-beneficial without determining an actual benefit or cost.

ULNRC-05919 October 17, 2012 Page 19 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway SAMA Number Potential Improvement Discussion SAMA Case Benefit Benefit at 3% Disc Rate Benefit at Realistic Disc Rate Benefit at 33yrs Benefit at 95%

CDF Cost Cost Basis Evaluation Basis for Evaluation 39 Replace two of the four electric safety injection pumps with diesel-powered pumps.

Reduced common cause failure of the safety injection system.

This SAMA was originally intended for the Westinghouse-CE System 80+, which has four trains of safety injection.

However, the intent of this SAMA is to provide diversity within the high-and l LOCA12

$48K

$85K

$44K

$75

$102

>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

41 Create a reactor coolant depressurization system.

Allows low pressure emergency core cooling system injection in the event of small LOCA and high-pressure safety injection failure.

DEPRESS

$12K

$20K

$11K

$17K

$25K

>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.

43 Add redundant DC control power for SW pumps.

Increased availability of SW.

SW01

$1K

$2K

$1K

$2K

$3K

>$100K Expert Panel Not Cost-Beneficial Cost will exceed benefit.

46 Add a service water pump.

Increased availability of cooling water.

SW02

$636K

$1M

$575K

$879K

$1.3M

>$5M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

54 Increase charging pump lube oil capacity.

Increased time before charging pump failure due to lube oil overheating in loss of cooling water sequences.

CHG01

$4K

$7K

$4K

$6K

$9K

>$100K Expert Panel Not Cost-Beneficial Cost will exceed benefit.

55 Install an independent reactor coolant pump seal injection system, with dedicated diesel.

Reduced frequency of core damage from loss of component cooling water, service water, or station blackout.

RCPLOCA

$94K

$168K

$85K

$148K

$198K

>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit. Previous investigation into installing such a system concluded that operators did not have sufficient time to place the system in service prior to seal damage.

56 Install an independent reactor coolant pump seal injection system, without dedicated diesel.

Reduced frequency of core damage from loss of component cooling water or service water, but not a station blackout.

RCPLOCA

$94K

$168K

$85K

$148K

$198K

>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.

58 Install improved reactor coolant pump seals.

Reduced likelihood of reactor coolant pump seal LOCA.

RCPLOCA

$94K

$168K

$85K

$148K

$198K

>$3M Not Cost-Beneficial Cost will exceed benefit.

59 Install an additional component cooling water pump.

Reduced likelihood of loss of component cooling water leading to a reactor coolant pump seal LOCA.

CCW01

$59K

$106K

$53K

$93K

$124K

>$1M Cost will exceed benefit Not Cost-Beneficial Cost will exceed benefit.

64 Implement procedure and hardware modifications to allow manual alignment of the fire water system to the component cooling water system, or install a component cooling water header cross-tie.

Improved ability to cool residual heat removal heat exchangers.

FWCCW2

$104K

$184K

$94K

$161K

$220K

<$150K Expert Panel Potentially Cost Beneficial The cost estimate is for development of a procedure and use of temporary connections. Cost of permanent modification would be significantly higher.

ULNRC-05919 October 17, 2012 Page 20 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway SAMA Number Potential Improvement Discussion SAMA Case Benefit Benefit at 3% Disc Rate Benefit at Realistic Disc Rate Benefit at 33yrs Benefit at 95%

CDF Cost Cost Basis Evaluation Basis for Evaluation 65 Install a digital feed water upgrade.

Reduced chance of loss of main feed water following a plant trip.

FW01

$29K

$50K

$27K

$44K

$62K

$19M Callaway Modification Costs Not Cost-Beneficial Cost will exceed benefit.

71 Install a new condensate storage tank (auxiliary feedwater storage tank).

Increased availability of the auxiliary feedwater system.

CST01

$18K

$32K

$16K

$28K

$39K

>$2.5M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

77 Provide a passive, secondary-side heat-rejection loop consisting of a condenser and heat sink.

Reduced potential for core damage due to loss-of-feedwater events.

FW01

$29K

$50K

$27K

$44K

$62K

$>1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

79 Replace existing pilot-operated relief valves with larger ones, such that only one is required for successful feed and bleed.

Increased probability of successful feed and bleed.

FB01

$79K

$133K

$72K

$117K

$168K

>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.

80 Provide a redundant train or means of ventilation.

Increased availability of components dependent on room cooling.

HVAC

$156K

$259K

$141K

$227K

$331K

<$100K Expert Panel Potentially Cost Beneficial Procedures to open doors or provide temporary ventilation may be cost beneficial for the EDGs, MDAFW pumps, and charging pumps. Procedures for opening doors to the DC switchgear rooms exist.

87 Replace service and instrument air compressors with more reliable compressors which have self-contained air cooling by shaft driven fans.

Elimination of instrument air system dependence on service water cooling.

INSTAIR

$2K

$3K

$2K

$$2K

$4K

>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.

91 Install a passive containment spray system.

Improved containment spray capability.

CONT01

$793K

$1.2M

$717K

$1.1M

$1.7M

>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

93 Install an unfiltered, hardened containment vent.

Increased decay heat removal capability for non-ATWS events, without scrubbing released fission products.

CONT01

$793K

$1.2M

$717K

$1.1M

$1.7M

>$2M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

94 Install a filtered containment vent to remove decay heat. Option 1: Gravel Bed Filter; Option 2: Multiple Venturi Scrubber Increased decay heat removal capability for non-ATWS events, with scrubbing of released fission products.

CONT01

$793K

$1.2M

$717K

$1.1M

$1.7M

>$2M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

96 Provide post-accident containment inerting capability.

Reduced likelihood of hydrogen and carbon monoxide gas combustion.

H2BURN

$10K

$15K

$9K

$13K

$20K

>$100K Expert Panel Not Cost-Beneficial Cost will exceed benefit.

97 Create a large concrete crucible with heat removal potential to contain molten core debris.

Increased cooling and containment of molten core debris. Molten core debris escaping from the vessel is contained within the crucible and a water cooling mechanism cools the molten core in the crucible, preventing melt-through of the base mat.

MAB

>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

ULNRC-05919 October 17, 2012 Page 21 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway SAMA Number Potential Improvement Discussion SAMA Case Benefit Benefit at 3% Disc Rate Benefit at Realistic Disc Rate Benefit at 33yrs Benefit at 95%

CDF Cost Cost Basis Evaluation Basis for Evaluation 98 Create a core melt source reduction system.

Increased cooling and containment of molten core debris. Refractory material would be placed underneath the reactor vessel such that a molten core falling on the material would melt and combine with the material. Subsequent spreading and heat removal from the vitrified compound would be facilitated, and concrete attack would not occur.

MAB

>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

99 Strengthen primary/secondary containment (e.g., add ribbing to containment shell).

Reduced probability of containment over-pressurization.

CONT01

$1.2M

$1.2M

$717K

$1.1M

$1.7M

>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

100 Increase depth of the concrete base mat or use an alternate concrete material to ensure melt-through does not occur.

Reduced probability of base mat melt-through.

MAB

>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

102 Construct a building to be connected to primary/secondary containment and maintained at a vacuum.

Reduced probability of containment over-pressurization.

CONT01

$1.2M

$1.2M

$717K

$1.1M

$1.7M

>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

104 Improve leak detection procedures.

Increased piping surveillance to identify leaks prior to complete failure. Improved leak detection would reduce LOCA frequency.

LOCA05

$685K

$1.2M

$620K

$1.1M

$1.5M

>$2M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

107 Install a redundant containment spray system.

Increased containment heat removal ability.

CONT01

$1.2M

$1.2M

$717K

$1.1M

$1.7M

>$2M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

108 Install an independent power supply to the hydrogen control system using either new batteries, a non-safety grade portable generator, existing station batteries, or existing AC/DC independent power supplies, such as the security system diesel.

Reduced hydrogen detonation potential.

H2BURN

$10K

$15K

$9K

$13K

$20K

>$100K Expert Panel Not Cost-Beneficial 109 Install a passive hydrogen control system.

Reduced hydrogen detonation potential.

H2BURN

$10K

$15K

$9K

$13K

$20K

>$100M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

110 Erect a barrier that would provide enhanced protection of the containment walls (shell) from ejected core debris following a core melt scenario at high pressure.

Reduced probability of containment failure.

MAB

>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

111 Install additional pressure or leak monitoring instruments for detection of ISLOCAs.

Reduced ISLOCA frequency.

ISLOCA

$123K

$179K

$111K

$154K

$259K

>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.

112 Add redundant and diverse limit switches to each containment isolation valve.

Reduced frequency of containment isolation failure and ISLOCAs.

CONT02

$1K

$1K

$1K

$1K

$2K

>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

113 Increase leak testing of valves in ISLOCA paths.

Reduced ISLOCA frequency.

ISLOCA

$123K

$179K

$111K

$154K

$259K

>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

ULNRC-05919 October 17, 2012 Page 22 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway SAMA Number Potential Improvement Discussion SAMA Case Benefit Benefit at 3% Disc Rate Benefit at Realistic Disc Rate Benefit at 33yrs Benefit at 95%

CDF Cost Cost Basis Evaluation Basis for Evaluation 114 Install self-actuating containment isolation valves.

Reduced frequency of isolation failure.

CONT02

$1K

$1K

$1K

$1K

$2K

>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.

115 Locate residual heat removal (RHR) inside containment Reduced frequency of ISLOCA outside containment.

ISLOCA

$123K

$179K

$111K

$154K

$259K

>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

116 Ensure ISLOCA releases are scrubbed. One method is to plug drains in potential break areas so that break point will be covered with water.

Scrubbed ISLOCA releases.

ISLOCA

$123K

$179K

$111K

$154K

$259K

>$1M Expert Panel Not Cost-Beneficial Cost would exceed benefit. Current plant design requires drains to be open.

Analysis and license changes required to implement are included in the cost estimate.

119 Institute a maintenance practice to perform a 100% inspection of steam generator tubes during each refueling outage.

Reduced frequency of steam generator tube ruptures.

NOSGTR

$1.4M

$2.1M

$1.2M

$1.8M

$2.9M

>$3M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

121 Increase the pressure capacity of the secondary side so that a steam generator tube rupture would not cause the relief valves to lift.

Eliminates release pathway to the environment following a steam generator tube rupture.

NOSGTR

$1.4M

$2.1M

$1.2M

$1.8M

$2.9M

>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

122 Install a redundant spray system to depressurize the primary system during a steam generator tube rupture Enhanced depressurization capabilities during steam generator tube rupture.

NOSGTR

$1.4M

$2.1M

$1.2M

$1.8M

$2.9M

>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

125 Route the discharge from the main steam safety valves through a structure where a water spray would condense the steam and remove most of the fission products.

Reduced consequences of a steam generator tube rupture.

NOSGTR

$1.4M

$2.1M

$1.2M

$1.8M

$2.9M

>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

126 Install a highly reliable (closed loop) steam generator shell-side heat removal system that relies on natural circulation and stored water sources Reduced consequences of a steam generator tube rupture.

NOSGTR

$1.4M

$2.1M

$1.2M

$1.8M

$2.9M

>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

129 Vent main steam safety valves in containment.

Reduced consequences of a steam generator tube rupture.

NOSGTR

$1.4M

$2.1M

$1.2M

$1.8M

$2.9M

>$10M Expert Panel Not Cost-Beneficial Cost will exceed benefit. Current containment design does not support this modification.

Modifications to containment and associated analysis are included in the cost estimate.

130 Add an independent boron injection system.

Improved availability of boron injection during ATWS.

NOATWS

$63K

$104K

$57K

$90K

$134K

>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

131 Add a system of relief valves to prevent equipment damage from pressure spikes during an ATWS.

Improved equipment availability after an ATWS.

NOATWS

$63K

$104K

$57K

$90K

$134K

>$2M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

ULNRC-05919 October 17, 2012 Page 23 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway SAMA Number Potential Improvement Discussion SAMA Case Benefit Benefit at 3% Disc Rate Benefit at Realistic Disc Rate Benefit at 33yrs Benefit at 95%

CDF Cost Cost Basis Evaluation Basis for Evaluation 133 Install an ATWS sized filtered containment vent to remove decay heat.

Increased ability to remove reactor heat from ATWS events.

NOATWS

$63K

$104K

$57K

$90K

$134K

>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit 136 Install motor generator set trip breakers in control room.

Reduced frequency of core damage due to an ATWS.

NOATWS

$63K

$104K

$57K

$90K

$134K

>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.

147 Install digital large break LOCA protection system.

Reduced probability of a large break LOCA (a leak before break).

LOCA05

$689K

$1.2M

$620K

$1.1M

$1.5M

>$5M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

153 Install secondary side guard pipes up to the main steam isolation valves.

Prevents secondary side depressurization should a steam line break occur upstream of the main steam isolation valves.

Also guards against or prevents consequential multiple steam generator tube ruptures following a main steam line break event.

NOSLB

$51K

$87K

$46K

$77K

$108K

>$1M Expert Panel Not Cost-Beneficial Cost will exceed benefit.

160 Modifications to lessen impact of internal flooding path through Control Building dumbwaiter.

Lower impact of flood that propagates through the dumbwaiter

<$50K Expert Panel Potentially Cost-Beneficial Relatively minor modifications to door opening could result in lower flow to the dumbwaiter. Specific benefit could not be calculated but SAMA item is judged to be low cost and therefore potentially cost beneficial.

161 Improvements to PORV performance that will lower the probability of failure to open.

Decrease in risk due to PORV failing to open.

PORV

$18K

$32K

$16K

$28K

$39K

>$100K Expert Panel Not Cost-Beneficial Cost will exceed benefit.

162 Install a large volume EDG fuel oil tank at an elevation greater than the EDG fuel oil day tanks.

Allows transfer of EDF fuel oil to the EDG day tanks on failure of the fuel oil transfer pumps.

EDGFUEL

$124K

$131K

$113K

$156K

$263K

$150K Wolf Creek Potentially Cost-Beneficial Wolf Creek estimated cost of $150K is less than the potential benefit.

163 Improve feedwater check valve reliability to reduce probability of failure to open.

Lower risk due to failures in which feedwater check valves fail to open and allow feeding of the steam generators.

FW02

$127K

$218K

$115K

$191K

$270K

>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.

164 Provide the capability to power the normal service water pumps from AEPS.

Provide backup to ESW in conditions with power only available from AEPS.

SW03

$1191K

$307K

$172K

$267K

$403K

>$500K Expert Panel Not Cost-Beneficial Cost will exceed benefit.

171 Increase the size of the RWST or otherwise improve the availability of the RWST Ensure a supply of makeup water is available from the RWST.

LOCA04

$13K

$23K

$12K

$20K

$27K

>$100K Expert Panel Not Cost-Beneficial Cost will exceed benefit.

178 Improvements to UHS cooling tower electrical room HVAC.

Improve availability or mitigate loss of HVAC.

HVAC02

$113K

$181K

$102K

$158K

$239K

<$100K Expert Panel Potentially Cost Beneficial Implementation of temporary ventilation or opening of doors will be a lower cost than the calculated benefit.

ULNRC-05919 October 17, 2012 Page 24 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway SAMA Number Potential Improvement Discussion SAMA Case Benefit Benefit at 3% Disc Rate Benefit at Realistic Disc Rate Benefit at 33yrs Benefit at 95%

CDF Cost Cost Basis Evaluation Basis for Evaluation 179 Modify procedures such that the water loop seals in the RCS cold legs are not cleared following core damage.

Prevents possible thermally induced steam generator tube rupture following core damage.

RAI7a

$63K

$87K

$57K

$75K

$134K

<$100K Expert Panel Potentially Cost Beneficial Implementation of procedure change will be lower cost than benefit, especially if 95%

CDF benefit is considered.

180 Install lower amperage fuses for various 14 AWG control circuits in the MCR. The majority of the modification centers around the trip circuit fuses on NB, NG, PA, PB, and PG system breakers.

Reduced fire risk.

Potentially Cost Beneficial SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.

181 Install redundant fuses and isolation switches for MCR evacuation procedure OTO-ZZ-00001.

Reduced fire risk.

Potentially Cost Beneficial SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.

182 To protect against multiple spurious operation scenarios, cable runs will be changed to run a single wire in a protected metal jacket such that spurious valve opening due to a hot short affecting the valve control circuit is eliminated for the fire area. This modification will be implemented in multiple fire areas.

Reduced fire risk.

Potentially Cost Beneficial SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.

183 Quick response sprinkler heads in cable chases A-11, C-30, and C-31 will be modified to be in accordance with the applicable requirements of NFPA 13-1976 edition.

Reduced fire risk.

Potentially Cost Beneficial SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.

ULNRC-05919 October 17, 2012 Page 25 of 34 Table 8-1. Callaway Plant Sensitivity Evaluation Callaway SAMA Number Potential Improvement Discussion SAMA Case Benefit Benefit at 3% Disc Rate Benefit at Realistic Disc Rate Benefit at 33yrs Benefit at 95%

CDF Cost Cost Basis Evaluation Basis for Evaluation 184 Improvements in the reliability of the Steam Line Isolation automatic signal.

More reliable main steam line isolation.

SLIS

$28K

$40K

$23K

$35K

$55K

>$500K Expert Panel Not Cost-Beneficial Cost is for installation of redundant instrumentation system and would likely be much higher.

Procedure and training already direct operators to manually back up failed automatic actuations.

185 Automate initiation of CCW flow to the RHR heat exchangers.

More reliable than manual initiation of flow to RHR HX.

HEP

$62K

$112K

$56K

$99K

$132K

>$200K Expert Panel Potentially Cost Beneficial 186 Develop a procedure and obtain equipment to provide a temporary hookup of fire water to the RHR heat exchangers to use as a backup to CCW for removing decay heat.

Backup method of removing decay heat if CCW is lost.

FWCCW

$1K

$2K

$1K

$2K

$2K

>$1M Expert Panel Not Cost Beneficial Ability to do this will require larger fire pumps 187 Install modification to power the normal charging pump from an existing spare breaker from the AEPS.

Another source of backup power to the NCP in cases of station blackout or loss of service water SBOMOD

$174K

$272K

$157K

$236K

$367K

$350K Expert Panel Potentially Cost Beneficial Already installed spare circuit breaker, implementation requires power and control cables.

188 Install a permanent, dedicated generator for the NCP, and a motor-driven AFW pump and battery charger to address SBO events in which the TD AFW pump is unavailable.

Another source of backup power to the NCP, DC power (pump/valve control and SG level instrumentation), and power to an AFW pump in cases of station blackout or loss of service water SBOMOD2

$182K

$285K

$165K

$247K

$385K

$400K Expert Panel Potentially Cost Beneficial AEPS was installed with a spare breaker and expansion capability that could be used to supply various equipment.

ULNRC-05919 October 17, 2012 Page 26 of 34 Table 9-1. Callaway Plant Potentially Cost Beneficial SAMAs Callaway SAMA Number Potential Improvement Discussion Additional Discussion 11 Improve 4.16-kV bus cross-tie ability.

Increased availability of on-site AC power.

Physical cross-tie exists, but there is no analysis or procedures to allow its use except in specific outage conditions. Cost is to develop procedures and analysis to allow use of the cross-tie.

Benefit calculated is under-estimated since it was evaluated for only SBO sequences.

29 Provide capability for alternate injection via diesel-driven fire pump.

Improved injection capability.

Currently being evaluated by plant improvement program.

Would use unborated water and portable pump (fire truck).

Calculation of specific benefit of this SAMA was not performed since it is judged to be potentially low cost.

Evaluation will consider impacts of injection of non-borated water.

64 Implement procedure and hardware modifications to allow manual alignment of the fire water system to the component cooling water system, or install a component cooling water header cross-tie.

Improved ability to cool residual heat removal heat exchangers.

Cost based on development of procedure for temporary hookup of fire water to CCW heat exchangers.

Cost of permanent modification would be much greater.

ULNRC-05919 October 17, 2012 Page 27 of 34 Table 9-1. Callaway Plant Potentially Cost Beneficial SAMAs Callaway SAMA Number Potential Improvement Discussion Additional Discussion 80 Provide a redundant train or means of ventilation.

Increased availability of components dependent on room cooling.

Procedures to open doors or provide temporary ventilation may be cost beneficial for the EDGs, MDAFW pumps, and charging pumps. Procedures for opening doors to the DC switchgear rooms exist.

160 Modifications to lessen impact of internal flooding path through Control Building dumbwaiter.

Lower impact of flood that propagates through the dumbwaiter 162 Install a large volume EDG fuel oil tank at an elevation greater than the EDG fuel oil day tanks.

Allows transfer of EDG fuel oil to the EDG day tanks on failure of the fuel oil transfer pumps.

178 Improvements to UHS cooling tower electrical room HVAC.

Improve availability or mitigate loss of HVAC.

Implementation of temporary ventilation or opening of doors will be a lower cost than the calculated benefit.

179 Modify procedures such that the water loop seals in the RCS cold legs are not cleared following core damage.

Prevents possible thermally induced steam generator tube rupture following core damage.

Implementation of procedure change will be lower cost than benefit, especially if 95% CDF benefit is considered.

ULNRC-05919 October 17, 2012 Page 28 of 34 Table 9-1. Callaway Plant Potentially Cost Beneficial SAMAs Callaway SAMA Number Potential Improvement Discussion Additional Discussion 180 Install lower amperage fuses for various 14 AWG control circuits in the MCR.

The majority of the modification centers around the trip circuit fuses on NB, NG, PA, PB, and PG system breakers.

Reduced fire risk.

SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.

181 Install redundant fuses and isolation switches for MCR evacuation procedure OTO-ZZ-00001.

Reduced fire risk.

SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.

182 To protect against multiple spurious operation scenarios, cable runs will be changed to run a single wire in a protected metal jacket such that spurious valve opening due to a hot short affecting the valve control circuit is eliminated for the fire area. This modification will be implemented in multiple fire areas.

Reduced fire risk.

SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.

ULNRC-05919 October 17, 2012 Page 29 of 34 Table 9-1. Callaway Plant Potentially Cost Beneficial SAMAs Callaway SAMA Number Potential Improvement Discussion Additional Discussion 183 Quick response sprinkler heads in cable chases A-11, C-30, and C-31 will be modified to be in accordance with the applicable requirements of NFPA 13-1976 edition.

Reduced fire risk.

SAMA considered potentially cost beneficial without benefit or cost determination since the NFPA 805 license amendment request committed to performing the modification.

185 Automate initiation of CCW flow to the RHR heat exchangers.

More reliable than manual initiation of flow to RHR HX.

187 Install modification to power the normal charging pump from an existing spare breaker from the AEPS.

Another source of backup power to the NCP in cases of station blackout or loss of service water Already installed spare circuit breaker, implementation requires power and control cables.

188 Install a permanent, dedicated generator for the NCP, and a motor-driven AFW pump and battery charger to address SBO events in which the TD AFW pump is unavailable.

Another source of backup power to the NCP, DC power (pump/valve control and SG level instrumentation), and power to an AFW pump in cases of station blackout or loss of service water AEPS was installed with a spare breaker and expansion capability that could be used to supply various equipment.

ULNRC-05919 October 17, 2012 Page 30 of 34 Table 11-1. Callaway Plant Release Category Frequency Results Obtained From SAMA Cases RELEASE CATEGORY BASE NOATWS INSTAIR NOLOSP NOSLOCA CCW01 FW01 NOSGTR NOSLB CHG01 LERF-IS 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 LERF-CI 1.658E-10 1.411E-10 1.658E-10 1.422E-10 6.210E-11 1.567E-10 1.658E-10 1.658E-10 1.610E-10 1.658E-10 LERF-CF 1.125E-08 1.103E-08 1.124E-08 7.372E-09 5.378E-09 1.071E-08 1.115E-08 1.135E-08 1.116E-08 1.123E-08 LERF-SG 2.331E-06 2.306E-06 2.330E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 0.000E+00 2.331E-06 2.331E-06 LERF-ITR 2.170E-07 1.845E-07 2.167E-07 1.309E-07 2.072E-07 2.170E-07 2.052E-07 0.000E+00 1.936E-07 2.169E-07 LATE-BMT 2.551E-06 2.268E-06 2.547E-06 1.254E-07 2.022E-06 2.507E-06 2.448E-06 2.626E-06 2.515E-06 2.467E-06 LATE-COP 3.185E-06 3.185E-06 3.185E-06 1.796E-08 3.170E-06 3.185E-06 3.185E-06 2.234E-06 3.185E-06 3.185E-06 SERF 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 INTACT 8.080E-06 8.075E-06 8.080E-06 7.065E-06 2.540E-06 7.573E-06 7.983E-06 8.119E-06 7.773E-06 8.137E-06 TOTAL 1.655E-05 1.620E-05 1.654E-05 9.851E-06 1.045E-05 1.600E-05 1.634E-05 1.316E-05 1.618E-05 1.652E-05 Table 11-1. Callaway Plant Release Category Frequency Results Obtained From SAMA Cases (Cont.)

RELEASE CATEGORY SW01 NOSBO LOCA05 H2BURN RCPLOCA LOCA 12 CONT02 LOCA04 LOCA03 CONT01 LERF-IS 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 LERF-CI 1.658E-10 1.658E-10 6.210E-11 1.658E-10 1.567E-10 1.658E-10 0.000E+00 1.658E-10 1.658E-10 1.658E-10 LERF-CF 1.124E-08 1.030E-08 5.018E-09 4.102E-12 1.048E-08 1.099E-08 1.125E-08 1.114E-08 1.089E-08 1.125E-08 LERF-SG 2.331E-06 2.329E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 2.298E-06 2.331E-06 LERF-ITR 2.170E-07 1.443E-07 2.072E-07 2.170E-07 2.170E-07 2.165E-07 2.170E-07 2.170E-07 2.169E-07 2.170E-07 LATE-BMT 2.553E-06 1.611E-06 2.009E-06 2.551E-06 2.475E-06 1.893E-06 2.551E-06 2.441E-06 2.007E-06 2.551E-06 LATE-COP 3.181E-06 2.426E-06 3.170E-06 3.170E-06 3.173E-06 3.182E-06 3.185E-06 3.185E-06 3.185E-06 0.000E+00 SERF 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 INTACT 8.080E-06 7.883E-06 2.170E-06 8.080E-06 7.301E-06 8.329E-06 8.080E-06 8.080E-06 8.180E-06 8.080E-06 TOTAL 1.655E-05 1.458E-05 1.007E-05 1.652E-05 1.568E-05 1.614E-05 1.655E-05 1.644E-05 1.607E-05 1.336E-05

ULNRC-05919 October 17, 2012 Page 31 of 34 Table 11-1. Callaway Plant Release Category Frequency Results Obtained From SAMA Cases RELEASE CATEGORY BREAKER DC01 SW02 CCW02 CST01 ISLOCA LOSP1 DEPRESS LOCA06 HVAC LERF-IS 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 0.000E+00 1.730E-07 1.730E-07 1.730E-07 1.730E-07 LERF-CI 1.666E-10 1.658E-10 1.514E-10 1.422E-10 1.650E-10 1.658E-10 1.666E-10 1.658E-10 1.658E-10 1.658E-10 LERF-CF 1.129E-08 1.124E-08 9.088E-09 8.906E-09 1.112E-08 1.125E-08 1.113E-08 1.122E-08 1.109E-08 1.099E-08 LERF-SG 2.328E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 2.331E-06 2.329E-06 LERF-ITR 2.093E-07 2.170E-07 2.013E-07 2.108E-07 2.169E-07 2.170E-07 1.814E-07 2.160E-07 2.169E-07 1.944E-07 LATE-BMT 2.047E-06 2.551E-06 2.213E-06 1.864E-06 2.022E-06 2.551E-06 2.039E-06 2.508E-06 2.020E-06 1.657E-06 LATE-COP 3.210E-06 3.185E-06 8.964E-07 1.455E-06 3.185E-06 3.185E-06 2.991E-06 3.166E-06 3.185E-06 2.917E-06 SERF 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 INTACT 8.180E-06 8.080E-06 7.898E-06 7.836E-06 8.471E-06 8.080E-06 8.431E-06 8.069E-06 8.431E-06 8.312E-06 TOTAL 1.616E-05 1.655E-05 1.372E-05 1.388E-05 1.641E-05 1.638E-05 1.616E-05 1.647E-05 1.637E-05 1.559E-05

ULNRC-05919 October 17, 2012 Page 32 of 34 Table 11-1. Callaway Plant Release Category Frequency Results Obtained From SAMA Cases RELEASE CATEGORY FB01 PORV EDGFUEL FW02 SW03 HVAC02 RAI7a SLIS HEP FWCCW2 LERF-IS 1.730E-07 1.730E-07 1.730E-10 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 1.730E-07 LERF-CI 1.658E-10 1.658E-10 1.658E-10 1.658E-10 1.514E-10 1.658E-10 1.658E-10 1.658E-10 1.658E-10 1.567E-10 LERF-CF 1.094E-08 1.112E-08 1.124E-08 1.047E-08 1.031E-08 1.096E-08 1.135E-08 1.123E-08 1.080E-08 1.048E-10 LERF-SG 2.326E-06 2.331E-06 2.331E-06 2.324E-06 2.331E-06 2.331E-06 2.331E-06 2.290E-06 2.329E-06 2.317E-06 LERF-ITR 1.796E-07 2.169E-07 2.169E-07 1.659E-07 2.141E-07 2.169E-07 7.508E-08 2.138E-07 2.170E-07 2.170E-07 LATE-BMT 2.006E-06 2.022E-06 2.544E-06 1.983E-06 2.428E-06 1.990E-06 2.631E-06 2.545E-06 2.523E-06 2.467E-06 LATE-COP 3.185E-06 3.185E-06 3.182E-06 3.185E-06 2.557E-06 2.823E-06 3.235E-06 3.185E-06 3.185E-06 3.174E-06 SERF 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 INTACT 8.146E-06 8.471E-06 8.078E-06 7.796E-06 7.907E-06 8.461E-06 8.119E-06 8.036E-06 7.529E-06 7.311E-06 TOTAL 1.603E-05 1.641E-05 1.636E-05 1.564E-05 1.562E-05 1.601E-05 1.658E-05 1.645E-05 1.597E-05 1.566E-05

ULNRC-05919 October 17, 2012 Page 33 of 34 Table 11-1. Callaway Plant Release Category Frequency Results Obtained From SAMA Cases RELEASE CATEGORY SBOMOD SBOmod2 4kv2 FWCCW LERF-IS 1.730E-07 1.730E-07 1.730E-07 1.730E-07 LERF-CI 1.658E-10 1.658E-10 1.658E-10 1.658E-10 LERF-CF 1.102E-08 1.102E-08 1.124E-10 1.124E-08 LERF-SG 2.331E-06 2.331E-06 2.331E-06 2.331E-06 LERF-ITR 1.628E-07 1.603E-07 2.170E-07 2.170E-07 LATE-BMT 2.485E-06 2.482E-06 2.551E-06 2.551E-06 LATE-COP 2.668E-06 2.642E-06 3.156E-06 3.184E-06 SERF 0.000E+00 0.000E+00 0.000E+00 0.000E+00 INTACT 8.046E-06 8.044E-06 8.080E-06 8.078E-06 TOTAL 1.588E-05 1.584E-05 1.651E-05 1.655E-05

ULNRC-05919 October 17, 2012 Page 34 of 34 RAI 7.b:

SAMA 64 (implement procedure and hardware modifications to allow manual alignment of the fire water system to the component cooling water system, or install a component cooling water header cross-tie) is evaluated by eliminating CCW pump failures. Consider a similar SAMA that provides fire water to the ESW system.

Callaway Response SAMA 64 was revised to evaluate the benefit of a temporary hookup of fire water as backup on loss of CCW cooling to the RHR heat exchangers. This determined the benefit to be $104K with a 95% CDF benefit of $220K. This SAMA is considered potentially cost beneficial and has been added to the list of potentially cost beneficial SAMAs.

SAMA 186 was added to evaluate procedures to provide fire water to the ESW system. This SAMA was considered potentially cost beneficial based on the 95% CDF benefit.

Implementation of this SAMA will cost significantly more than a procedure change since it would require replacement of the existing fire pumps with larger pumps.

FWCCW The CCW fault trees were modified to add fire water as a backup source of cooling to the CCW heat exchangers. The fire water pumps and system do not appear in the PRA. To simulate the use of the fire water pumps and operator actions to perform the temporary hookup, a single basic event with failure probability of 0.1 was placed in the fault trees.

This case is used to evaluate the benefit of providing a temporary hookup of fire water to the CCW heat exchangers.

Corresponding Amendment Changes No changes to the License Renewal Application (LRA) are needed as a result of this response.

Retrieved from "https://kanterella.com/w/index.php?title=ML12292A404&oldid=5249801"