ML20248E860
| ML20248E860 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 10/02/1989 |
| From: | VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | |
| Shared Package | |
| ML20248E857 | List: |
| References | |
| NUDOCS 8910060073 | |
| Download: ML20248E860 (19) | |
Text
_ - _.
D' ATTACHMENT 1 n
PROPOSED TECHNICAL SPECIFICATION CHANGES FOR UNITS 1 AND 2 101-JST-3194D-1 8910060073 891002 PDR ADOCK 05cDOO338 P
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PLANT SYSTEMS 3/4.7.12 SETTLEMENT OF CLASS 1 STRUCTURES LIMITING CONDITION FOR OPERATION 3.7212.1 The total settlement of each Class 1 structure or the differential settlement between Class 1 structures shall not exceed the allowable values of Table 3.7-5.
APPLICABILITY:
ALL MODES ACTION:
a.
With either the total settlement of any structure or the differential settlement of any structures exceeding 75 percent of the allowable settlement, conduct an engineering review of field conditions and evaluate the consequences of additional settlement.
Submit a special report to the Commiysion pursuant to Specification 6.9.2 within 60 days, containing the results of the investigation, the evaluation of existing and possible continued settlement and the remedial action to be taken if any, including the date of the next survey, b.
With the total settlement of any structure or the differential settlement of any two structures exceedir:9 the allowable settlement value of Table 3.7-5, be in at least HOT STANDBY within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
3 SURVEILLANCE RE0VIREMENTS 4.7.12.1 The total settlement of each Class 1 structure or the differential settlement between Class 1 structures listed in Table 3.7-5 shall be determined by measurement and calculation at least once per 6 months.
The accuracy of the measurements shall be in accordance with second-order Class II accuracy as defined by the U.S. Department of Commerce, National Oceanic and Atmospheric Administration. National Ocean Survey, 1974.
NORTH ANNA - UNIT 1 Amendment No.
103-JAC-7286S-1
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PLANT SYSTEMS BASES 3/4.7.12 SETTLEMENT OF CLASS 1 STRUCTURES In order to assure that settlement does not exceed predicted and allowable settlement values, a program has been established to conduct a survey of a specified number of points at the site on a semi-annual basis.
The first survey was conducted in May 1976 to establish baseline elevations for most of the points.
Where applicable, the base-line elevations of points established subsequent to the May 1976 survey have been adjusted to the May 1976 survey by an evaluation of the settlement records of settlement points on the same structure or on nearby structures.
Baseline elevations for some points were established on dates other than May 1976 as indicated in Table 3.7-5.
Addii.cul surveys will be performed semi-annually.
The determination of the elevation of the points located in the immediate vicinity of the Service Water Reservoir shall be by precise leveling with second-order Class II accuracy as defined by the U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Ocean Survey,1974.
The change in elevation of points 113 and 117 in the main plant area shall be determined by direct measurement from a single instrument set-up.
A difference in survey rod readings from the single set-up will establish an initial difference in elevation between the two points.
Subsequent readings will determine if there is a change in the initial difference, indicating additional differential movement.
Because the differential movement between points 113 and 117 have previously approached the allowable limit, the direct reading method will provide the most accurate data and will minimize random survey error associated with survey loops. The direct reading method will involve equipment and will produce results that are comparable to second-order Class II accuracy.
The change in elevation for point 114, which has more margin between recorded settlement and the allowable limit, will be determined by a short level loop from rock-founded reference monument J, through the points, and back to the monument. This loop will involve a minimum of set-ups and will be performed with second-order Class II accuracy. The loop will also include points 113 and 117 as a check against the direct reading method.
All settlements recorded by the direct reading method will continue to be referenced to the original baseline date for each point to maintain continuity.
l When any settlement point listed in Table 3.7-5 is inaccessible during a survey, comparison to allowable settlement shall be based on settlement of other points on the same structure or on nearby structures having similar foundation conditions.
When any settlement point listed in Table 3.7-5 is dislocated or replaced, a documented review of the settlement records of points on the same structure and additionally points on nearby structures having similar foundation conditions shall provide a new reference elevation for the point that reflects the estimated settlement since the base-line survey.
If the total settlement or differential settlement exceeds 75 percent of the allowable value, the frequency of surveillance shall be increased as dictated by the engineering review.
NORTH ANNA - UNIT 1 Amendment No.
103-JAC-7286S-3 1
[
. Allowable differential movement is controlled by pipe deflections permitted by fixation points in buildings.
The items limiting differential settlement are as follows:
Ites No.
Reference Monitoring Points Limiting Item
. 1 Service Water Pump House Service L!ater Piping 0 SWPH Expansion Joint 2
Service Bldg. (E-14)
Unit 2 Main Steam Valve House 24"-WS-426, 428, 434, 436-151-Q3 The items limiting total settlement of structures are as follows:
Monitoring Points Limiting Item
- 3 Service Water Piping at SWPH 36"-WS-1,2-151-03 4
Service Building (E-17) 36"-WS-1,2,3,4-151-Q3 5
Service Water Valve House 321"-WS-D84-151-Q3-6'
-Service Water Tie-in Vault 36"-WS-1,2-151-Q3 l'
NORTH ANNA - UNIT 1 Amendment No.
103-JAC-7286S-4
PLANT SYSTEMS 3/4.7.12 SETTLEMENT OF CLASS 1 STRUCTURES LIMITING CONDITION FOR OPERATION 3.7c12.1 The total settlement of each Class I structure or the differential settlement between Class 1 structures shall not exceed the allowable values of Table 3.7-5.
APPLICABILITY:
ALL MODES ACTION:
a.
With either the total settlement of any structure or the differential settlement of any structures exceeding 75 percent of the allowable settlement, conduct an engineering review of field conditions and evaluate the consequences of additional settlement.
Submit a special report to the Commission pursuant to Specification 6.9.2 within 60 days, containing the results of the investigation, the evaluation of existing and possible continued settlement and the remedial action to be taken if any, including the date of the next survey.
b.
With the total settlement of any structure or the differential settlement of any two structures exceeding the allowable settlement value of Table 3.7-5, be in at least HOT STANDBY within 6 h jrs and COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
SURVEILLANCE RE0VIREMENTS 4.7.12.1 The total settlement of each Class 1 structure or the differential settlement between Class I structures listed in Table 3.7-5 shall be by measurement and calculation at least once per 6 months. The accuracy of the measurement shall be in accordance with second-order Class II accuracy as defined by the U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Ocean Survey,1974.
i l
NORTH ANNA - UNIT 2 Amendment No.
103-JAC-72865-5
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7 TO IN l
L PLANT SYSTEMS BASES 3/4.7.12 SETTLEMENT OF CLASS 1 STRUCTURES i
In order to assure that settlement does not exceed predicted and allowable settlement values, a program has been established to conduct a survey of a specified number of points at the. site on a semi-annual basis.
The first j
survey was conducted in May 1976 to establish baseline elevations for most of the points.
Where applicable, the base-line elevations of points established subsequent to the May 1976 survey have been adjusted-to the May 1976 survey by an evaluation.of the settlement records of settlement points on the same structure or on nearby structures.
Baseline elevations for some points were established on dates other than May 1976 as indicated in. Table 3.7-5.
Additional surveys will be perfonned semi-annually.
The determination of the elevation of the points located in the innediate. vicinity of the Service Water Reservoir shall be by precise leveling with second-order Class II accuracy as defined by the U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Ocean Survey,1974.
The change in elevation of points 113 and 117 in the main plant area shall be determined by direct measurement from a single instrument set-up. A difference in survey rod readings from the single set-up.will establish an initial difference in elevation between the two points. Subsequent readings will determine if there is a change in the initial difference, indicating additional differential movement.
Because the differential movement between points 113 and 117 have previously approached the allowable limit, the direct reading method will provide the most accurate data and will minimize random survey error associated with survey loops.
The direct reading method will involve equipment and will produce results that are comparable to second-order Class II accuracy.
The change in elevation for points 114 and 116, which have more margin between recorded settlement and the allowable limit, will be determined by a short level loop from rock-founded reference monument J, through the points, and back to the monument.
This loop will involve a minimum of set-ups and will be performed with second order Class II accuracy. The loop will also include points 113 and 117 as a check against the direct reading method.
All settlements recorded by the direct reading method will continue to be referenced to the original baseline date for each point to maintain continuity.
When any settlement point listed in Table 3.7-5 is inaccessible during a survey, comparison to allowable settlement shall be based on settlement of other points on the same structure or on nearby structures having similar foundation conditions. When any settlement point listed in Table 3.7-5 is dislocated or replaced, a documented review of the settlement records of points on the same structure and additionally points on nearby structures having similar foundation conditions shall provide a new reference elevation for the point that reflects the estimated settlement since the base-line survey.
If the total settlement or differential settlement exceeds 75 percent of the allowable value, the frequency of surveillance shall be increased as dictated by the engineering review.
NORTH ANNA - UNIT 2 Amendment No.
103-JAC-7286S-7
Allowable differential movement -is controlled by pipe deflections permitted by fixation points in buildings. The items limiting differential settlement are as follows:
~
Item No.
Reference Monitoring Points Limiting Item L
1-
- ' Service Building (E-14) Unit 2 Main Steam 24"-WS-426,428, Valve House 434,436-151-Q3 2
Service Water Pump Service Water Piping Expansion Joint House O SWPH The items limiting total settlement of structures-are as follows:
Monitoring Points Limiting Items 3
Service Water Piping @ SWPH 36"-WS-1,2-151-Q3 4
Service Building (E-15) 16"-WFPD-409,413,417 32"-SHP-401, 402, 403 5
Service Building (E-17) 36"-WS-1,2,3,4-151-03 6
Service Water Valve House 321"-WS-D84-151-Q3 7
Service Water Tie-in Vault-36"-WS-1,2-151-Q3 i
NORTH ANNA - UNIT 2 Amendment No.
103-JAC-72865-8
6 ATTACHMENT 2 SAFETY EVALUATION 1
1 101-JST-3194D-2
INTRODUCTION I
A safety evaluation has been performed which provides the basis for changes to Technical Specification 3/4.7.12. These changes include:
1 1.
Deletion of the settlement monitoring requirements for those structures which have not experienced. settlement during the 13 years that the settlement monitoring program has been in effect.
2.
Increased allowable settlement limits for a selected' number of structures for which the settlement monitoring program, in accordance with the requirements of Technical Specification 3/4.7.12, will remain in effect.
This is based on an evaluation of the capability of affected piping systems to accommodate the increased limit without exceeding the code allowable stress.
A summary of the Technical Report, which contains the justifications and detailed analyses, is presented below.
DISCUSSION AND EVALUATION The settlement monitoring program has been in effect for 13 years and has been performed by optical surveys to second order Class II accuracy. A detailed evaluation of the settlement data from 1976 to the present has uncovered two systematic survey errors which account for the apparent upward movement of rock-founded structures. When these two systematic survey errors are accounted for, the settlement data clearly demonstrates that the rock-founded structures are stable with no trend of settlement occurring over the 13 years that these structures have been monitored.
For those structures that have experienced some settlement, the critical piping systems were evaluated in order to increase the allowable settlement limit while still maintaining code allowable stresses in the piping system.
As a result of this comprehensive review of the settlement monitoring program at North Anna Power Station, only the following monitoring is required:
a.
Unit 2 Main Steam Valve House:
point 113 b.
Service Building: points 114, 116, 117 c.
Service Water Piping at the Service Water Pump House at the nor:F side of Expansion Joint:
points SM-17 and SM-18 d.
Service Water Pump House, Service Water Valve House, and Service Water Tie-in Vault.
I 101-JST-3194D-3
l CONCLUSION The deletion of the settlement monitoring program for certain structures and, in turn the associated piping systems, does not adversely affect the piping systems nor reduce any margins of safety. A comprehensive review of the settlement data that has been obtained during the 13 years of settlement monitoring has demonstrated that these structures have not experienced any settlement. Tne structures are stable and will continue to be stable in the future. Consequently, no settlement related pipe stress has been or will be induced on the piping systems that are affected by settlement of these structures.
For those structures that have experienced settlement and may continue to settle in the future, the requirement to continue the settlement monitoring program in accordance with Technical Specification 3/4.7.12 has been maintained. For piping systems affected by settlement, new allowable settlement limits were established based on pipe stress analysis of these piping systems without changing the original piping model or design inputs.
The only change was to increase the prescribed settlement in the mathematical model of the piping system to allow the pipe stress to approach, but not exceed, the code allowable stress.
In addition, the methods used to monitor the future settlement of the affected structures will be such that the maximum calculated random error in the measurement will result in a pipe stress of 5%
or less of the code allowable stress.
By continuing to monitor the structures that experienced settlement in the past and which may continue to settle will provide assurance that the margin of safety as defined in Technical Specification 3/4.7.12 is maintained for the safety related piping systems that i
are affected by settlement of these structures.
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i 101-JST-3194D-4
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e ATTACHMENT 3 10CFR50.92 EVALUATION
BASIS FOR NO SIGNIFICANT HAZARDS DETERMINATION The proposed changes"to delete specific structures from the settlement monitoring program and revise the allowable settlement limit for other structures have been evaluated in accordance with the standards of 10CFR50.92(c) and it has been determined that operations in accordance with these changes would not:
1.
Involve a significant increase in the probability or consequences of an accident previously evaluated:
The change to Technical Specification 3/4.7.12 does not involve a significant increase in the probability or consequences of an accident previously evaluated.
The settlement of structures is monitored in p
accordance with the requirements of Technical Specification 3/4.7.12 in order to ensure that the stress induced in safety-related piping systems as a result of the settlpment of structures remains within code allowables.
.The change to Technical Specification 3/4.7.12 contains two basic items:
a.
Deletion of the settlement monitoring program for those structures which have not experienced settlement during the 13 years that the settlement monitoring program has been in effect.
b.
Increase the allowable settlement limit for some of the structures l
that will remain part of the settlement monitoring program.
l 103-JST-7363B-1 1
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For those structures which are founded on rock, it has been demonstrated by the review of 13-years of settlement data, that no settlement has occurred.
No future settlement will occur since there is no mechanism to-induce increased loading on the rock mass that would cause settlement..Since rock behaves similarly to other elastic materials under load, settlement will not occur unless the loads are increased.
For the five soil-founded points which are being deleted from the settlement monitoring program required by Technical Specification 3/4.7.12, a review of the settlement monitoring data collected over 13 years has demonstrated that these points have not settled. Soil also behaves as an elastic material under load; although not linearly.
Settlement of structures founded on soil occurs over-time with the great majority of the settlement in a material such as saprolite occurring during the first few years the soil is loaded.
Thereafter, settlement will continue to occur, but at a much reduced rate. Depending on the type, consistency and composition of the soil, after a certain time the
. rate of settlement will approach zero. Soil-founded structures which have shown little or no settlement during 13 years of monitoring, will not experience additional settlement in the future unless additional load is applied to the soil.
There is no mechanism which would cause settlement to begin or increase without a corresponding increase in load.
Therefore future settlement of these structures is of no concern and the requirement to monitor these points can be deleted from the Technical Specification.
For those structures where settlement monitoring will continue and the allowable settlement limits are increased, the ability of the piping systems to perform their safety-related function has been assured by:
103-JST-7363B-2
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Maintaining the allowable settlement limit to a value such that the pipe stress remains within code allowables.
The flexible supporting-components.and pipe expansion joints ' remain within the working range.
N This-has been verified by pipe stress analysis for those piping systems which form the basis for the limiting settlement condition.
b.
The requirement to monitor these structures for future settlement is being maintained.
The Technical Specification will provide early notification of settlement problems (i.e. approaching or exceeding the allowable settlement limit).and the Limiting Condition for Operation (LCO) required by the Technical Specification will be met.
i c.
Surveying methods used to measure settlement will be modified such' that the random survey error introduced into the measurement will be minimized. This minimized random error will cause a maximum uncertainty in pipe stress of 5% or less of code allowable stress.
This very small component of the allowable pipe stress is well within l
the bounds of accuracy of the pipe stress analysis.
The uncertainty will be reduced by the new surveying procedures since the random error will be reduced from that associated with the original survey.
2.
Create the possibility of a new or different kind of accident from any accident previously evaluated-1 No new or different type of accident not considered by previous Commission safety reviews has been introduced by deleting the requirement to monitor the settlement of certain structures, or increasing the allowable j
103-JST-7363B-3 l
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settlement limit for other structures which will continue to be monitored.
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I for settlement in accordance with the requirements of Technical Specification-3/4.7.12.
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.3.
Involve a significant reduction in the margin of safety:
i
.The margin of safety as defined in the Technical Specification consists of ensuring that the settlement of structures does not exceed the allowable settlement limit. The allowable settlement limit is established to ensure that_the critical safety-related piping system remains within the code allowable stress.
The deletion of the settlement monitoring program for structures which have not experienced settlement over the 13 years of the monitoring program does not involve a significant reduction in the margin of safety.
For those structures which are founded on rock it has been demonstrated by the review of 13 years of settlement data that no settlement has occurred.
No future settlement will occur since there is no mechanism to induce increased
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loading on the rock mass that would cause settlement.
Since rock behaves similarly to other elastic materials under load, without increasing the load, settlement will not occur unless the loads are increased.
For the five soil-founded points which are being deleted from the settlement monitoring program required by Technical Specification 3/4.7.12, a review of the settlement monitoring data collected over 13 years has demonstrated that these points have not settled.
Soil also behaves as an elastic material under 103-JST-73638-4
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load; although not linearly.
Settlement of structures founded on soil occurs over time with the great majority of the settlement in a. material such as saprolite occurring during the first few years the soil is loaded.
Thereafter, settlement will continue to' occur, but at a much reduced rate.
Dependency on the type, consistency and composition of soil, after a certain time the rate of settlement will approach zero.
Soil-founded structures which have shown little or no settlement during 13 years of monitoring will not experience additional settlement in the future unless additional load is applied to the soil. There is' no mechanism which would cause settlement to begin or increase without a corresponding increase in load. Therefore future settlement of these structures is of no concern and the requirement to monitor these points can be deleted from the Technical Specification.
For those structures that have experienced settlement and may continue to settle in the future, the settlement monitoring program in accordance with Technical Specification 3/4.7.12 has been maintained.
Increased allowable settlement limits have been set based on pipe stress analysis of the piping systems that are affected by the settlement of these structures. The resulting l
pipe stress induced by the increased allowable settlement limits is within code allowables.- The flexible supporting components and pipe expansion joints remain within the working range. The ability to monitor the settlement of the structures which induce settlement related pipe stress is being maintained.
In addition, methods that will be used to seasure the settlement of these structures will have an increased accuracy over those that are currently being used.
The accuracy of measurement will be such that the random error in the measurement of settlement will cause an uncertainty in the pipe stress of 5% or less of the code allowable stress.
The uncertainty will be reduced by the new 103-JST-73638-5 l
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survey methods since the random error will be reduced from that associated with the original surveys.
Since the basis for Technical Specification 3/4.7.12 is to maintain pipe stress within code allowables, the margin of safety is not reduced.
Finally, by maintaining the requirement to monitor the settlement of these structures in accordance with the requirements of Technical Specification 3/4.7.12, early notification of settlement problems (i.e. approaching or
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exceeding the allowable settlement limit) is provided and the Limiting Condition for Operation (LCO) required by the Technical Specification will be met.
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