ML101440128
| ML101440128 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 05/20/2010 |
| From: | Hartz L Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 10-236A | |
| Download: ML101440128 (13) | |
Text
10 CFR 50.55a VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 May 20, 2010 U.S.NuclearRegulatory Commission Attention:
Document Control Desk Washington, D.C.20555 Serial No.NL&OS/ETS Docket Nos.License Nos.10-236A RO 50-338/339 NPF-4/7 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
NORTH ANNA POWER STATION UNITS 1 AND 2 REVISED PUMP RELIEF REQUEST P-1 FOURTH INTERVAL INSERVICE TESTING PROGRAM PLAN In a November 24,2009 letter (Serial No.09-715), Dominion submitted the Fourth Interval Inservice Testing (1ST)Program Plans for North Anna Power Station Units 1 and 2.Pursuant to 10 CFR 50.55a(f)(4)(ii), the 1ST programs were updated to comply with the ASME Code for Operations and Maintenance of Nuclear Power Plants 2004 Edition.The attachments to that letter included the 1ST Program Plans, which described the programmatic aspects of the 1ST programs, and included the associated proposed alternatives and relief requests for the fourth interval.In an April 6, 2010 e-mail from Dr.V.Sreenivas, the NRC requestedadditionalinformation (RAI)to complete the review of the proposed alternatives and relief requests.Dominion responded to the RAI in a letter dated April 27, 2010 (Serial No.1 0-236).In a phone call with the NRC on April 8,2010 to clarify the RAI, Dominion agreed to revise and resubmit Pump Relief Request P-1 for both North Anna Units 1 and 2.The attachment to this letter provides the revised Pump Relief Request P-1 for North Anna Units 1 and 2.As requested in the RAI, Dominion has verified that each pump listed in revised Relief Request P-1 has at least one reference valuelessthan 0.05 inches per second (ips).The fourth 1ST interval will begin on December 15, 2010 and North Anna Units 1 and 2 will begin implementation of the plans on that date.Therefore, Dominion continues to request review and approval of the relief requests by December 1, 2010.If you have any questions or require additional information, please contact Mr.Thomas Shaub at (804)273-2763.Sincerely,Vice President-Nuclear Support Services Commitments made in this letter: None
Attachment:
Revised Pump Relief Request P-1 for North Anna Units 1 and 2 cc: U.S.Nuclear Regulatory Commission Region II Marquis One Tower 245 Peachtree Center Avenue, NE Suite 1200 Atlanta, Georgia 30303-1257 Mr.J.E.Reasor, Jr.Old Dominion Electric Cooperative Innsbrook Corporate Center 4201 Dominion Blvd.Suite 300 Glen Allen, Virginia 23060 NRC Senior Resident Inspector North Anna Power Station Ms.K.R.Cotton NRC Project Manager U.S.Nuclear Regulatory Commission One White Flint North Mail Stop 0-8 G9A 11555 Rockville Pike Rockville, Maryland 20852 Dr.V.Sreenivas NRC Project Manager U.S.Nuclear Regulatory Commission One White Flint North Mail Stop 0-8 G9A 11555 Rockville Pike Rockville, Maryland 20852 Serial No.10-236A Docket Nos.50-338/339 Revised Pump Relief Request P-1 Page 2 of 2 Serial NO.1 0-236A Docket Nos.50-338/339 Revised Pump Relief Request P-1 Attachment REVISED PUMP RELIEF REQUEST P-1 FOR NORTH ANNA UNITS 1 AND 2 North Anna Power Station Virginia Electric and Power Company (Dominion)
Serial No.1 0-236A Docket No.50-338 Revised Pump Relief Request P-1 RELIEF REQUEST P-1 North Anna Unit 1 Proposed alternative in accordance with 10CFR50.55a(a)(3)(i)
Alternative provides acceptable level of quality and safety.1.0 ASME Code Components Affected Refer to Table P-1 2.0 Applicable Code Edition and Addenda ASME OM Code, 2004 Edition 3.0 Applicable Code Requirements ISTB-3300,"Reference Values" ISTB-3300(a) requires that initial reference values shall be determined from the results of testing meeting the requirements of ISTB-31 00,"Preservice Testing," or from the results of the first inservice test.ISTB-3300(d) requires that reference values shall be established at a point(s)of operation (reference point)readily duplicated during subsequent tests.ISTB-3300(f) requires that all subsequent test results shall be compared to these initial reference values or to new reference values established in accordance with ISTB-3310, ISTB-3320, or ISTB-6200(c).
ISTB-5120,"Inservice Testing" (Centrifugal Pumps, Except Vertical Line Shaft Centrifugal Pumps)ISTB-5121 (e)and ISTB-5123(e),"Group A Test Procedure and Comprehensive Test Procedure", require that all deviations from the reference values shall be compared with the ranges of Table ISTB-5121-1 and corrective action taken as specified in ISTB-6200.
Vibration measurements shall be compared to both the relative and absolute criteria shown in the alert and required action ranges of Table ISTB-5121-1.
For exampie, if vibration exceeds either 6Vr, or 0.7 in/sec, the pump is in the required action range.N1PVI4 Page 1 of 5 Serial NO.1 0-236A Docket No.50-338 Revised Pump Relief Request P-1 RELIEF REQUEST P-1 (Cont.)ISTB-5220,"Inservice Testing" (Vertical Line Shaft Centrifugal Pumps)ISTB-5221 (e)and ISTB-5223(e),"Group A Test Procedure and Comprehensive Test Procedure", require that all deviations from the reference values shall be compared with the ranges of Table ISTB-5221-1 and corrective action taken as specified in ISTB-6200.
Vibration measurements shall be compared to both the relative and absolute criteria shown in the alert and required action ranges of Table ISTB-5221-1.
Note: There are no ASME Code Classed positive displacement pumps in the North Anna 1ST Program.4.0 Reason for Request The pumps listed in Table P-1 tend to be smooth running pumps.Each pump listed in Table P-1 has at least one vibration reference value (V r)that is currently less than 0.05 inches per second (ips).Small values for V r produce small acceptable ranges for pump operation.
The acceptable ranges are defined in Tables ISTB-5121-1 and ISTB-5221-1 as less than or equal to 2.5V r*Based on a small acceptable range, a smooth running pump could be subject to unnecessary corrective action if the measured vibration parameter exceeds this acceptable range.For very small reference values, hydraulic noise and instrument error can be a significant portion of the reading and affect the repeatability of subsequent measurements.
Also, experience gathered from the North Anna preventive maintenance program has shown that changes in vibration levels in the range of 0.05 ips do not normally indicate significant degradation in pump performance.
To avoid unnecessary corrective action, a minimum value for V r of 0.05 ips has been established for velocity measurements.
This minimum value will be applied to individual vibration locations for the pumps listed in Table P-1 where the measured reference value is less than 0.05 ips.When new reference values are established per ISTB-3310, ISTB-3320 or6200(c), the measured parameters will be evaluated for each location to determine if the provisions of this relief request still apply.In addition to the requirements of ISTB, the pumps in the ASME Inservice Testing Program are included in the North Anna Predictive Maintenance Program.The North Anna Predictive Maintenance Program currently employs predictive monitoring techniques such as: N1PVI4 Page 2 of 5 Serial No.1 0-236A Docket No.50-338 Revised Pump Relief Request P-1 RELIEF REQUE8T P-1 (Cont.)*vibration monitoring and analysis beyond that required by 18T8,*oil sampling and analysis where applicable (e.g., for pumps with sufficiently large oil reservoirs).
If the measured parameters are outside the normal operating range or are determined by analysis to be trending toward an unacceptable degraded state, appropriate actions are taken that may include:*increased monitoring to establish rate of change,*review of component specific information to identify cause, and*removal of the pump from service to perform maintenance.
It should be noted that all of the pumps in the 18T Program will remain in the Predictive Maintenance Program even if certain pumps have very low vibration readings and are considered to be smooth running pumps.This alternative to the requirements of 18T8-3300, 18T8-5120 and 18T8-5220, and Table5121-1 and Table 18T8-5221-1 provides an acceptable level of quality and safety.5.0 Proposed Alternative and 8asis for Use For the pumps listed in Table P-1, if a measured reference value is below 0.05 ips for a particular vibration measurement location, then subsequent test results for that location may be compared to an acceptable range based on 0.05 ips.In addition to the Code requirements, all pumps in the 18T Program are included in and will remain in the North Anna Predictive Maintenance Program regardless of their smooth running status.Using the provisions of this relief request as an alternative to the specific requirements of 18T8-3300, 18T8-5120 and 18T8-5220, and Table 18T8-5121-1 and Table 18T8-5221-1 will provide adequate indication of pump performance and continue to provide an acceptable level of quality and safety.Therefore, pursuant to 10CFR50.55a(a)(3)(i), Relief Request P-1 requests relief from the specific 18T8 requirements identified in this request.6.0 Duration of the Proposed Alternative The proposed alternative described in Relief Request P-1 will be used for the North Anna Power 8tation Unit 1 Fourth Ten Year Inservice Testing Interval.N1PVI4 Page 3 of 5 Serial NO.1 0-236A Docket No.50-338 Revised Pump Relief Request P-1 RELIEF REQUEST P-1 (Cont.)7.0 Precedents A similar relief request for the North Anna Unit 1 Third Ten Year Inservice Testing Interval was approved by the NRC in their safety evaluation entitled"North Anna Power Station, Units Nos.1 and 2 Re: Inservice testing Program for Pumps and Valves, Third Ten Year Interval Update (TAC NOS.MB2221 and MB2222)" dated January 28, 2002.The following relief requests for other plants that are similar to P-1 were approved by the NRC.Pump Relief Request PRR8 for Beaver Valley 1 was approved by the NRC by letter dated 9/27/2007 (TAC NOS.MD5118-MD5131).Pump Relief Request PRR8 for Beaver Valley 2 was approved by the NRC by letter dated 2/14/2008 (TAC NOS.MD5595-MD5604).8.0 References 1.ASME OM Code, 2004 Edition N1PVI4 Page 4 of 5 RELIEF REQUEST P-1 (Cont.)Table P-1 Serial No.1 0-236A Docket No.50-338 Revised Pump Relief Request P-1 Pump Groups Code OM Description Pump Type Pump Speed System Class Group (rpm)1-CC-P-1A 1-CC-P-1B Component Cooling 3 A Component Cooling Water Pumps Centrifugal 1170 1-CH-P-1A Chemical and 1-CH-P-1C Volume Control/2 A High Head Safety Injection/Charging Centrifugal 4820 Safety Injection Pump Volume Control 1-CH-P-2A Chemical and 1-CH-P-2B Volume Control 2 A Boric Acid Transfer Pumps Centrifugal 3500 1-FW-P-3A Feedwater 3 Motor Driven Auxiliary Feedwater B Pumps Centrifugal 3560 1-HV-P-20A Heating and Control and Relay Room Chilled 1-HV-P-20B Ventilation 3 A Water Pumps Centrifugal 3560 1-HV-P-22A 1-HV-P-22B Heating and 3 A Control and Relay Room Condenser Centrifugal 1760 1-HV-P-22C Ventilation Water Pumps 1-RH-P-1 B Residual Heat 2 A Residual Heat Removal Pumps Centrifugal 1780 Removal 1-RS-P-3A Recirculation Spray 3 B Casing Cooling Pump Centrifugal 1780 Service Water 3 A Main Service Water Pump Centrifugal 1180 N1PVI4 Page 5 of 5 Serial NO.1 0-236A Docket No.50-339 Revised Pump Relief Request P-1 RELIEF REQUEST P-1 NORTH ANNA UNIT 2 Proposed alternative in accordance with 10CFR50.55a(a)(3)(i)
Alternative provides acceptable level of quality and safety.1.0 A8ME Code Components Affected Refer to Table P-1 4.0 Applicable Code Edition and Addenda A8ME OM Code, 2004 Edition 5.0 Applicable Code Requirements 18T8-3300,"Reference Values" 18T8-3300(a) requires that initial reference values shall be determined from the results of testing meeting the requirements of 18T8-31 00,"Preservice Testing," or from the results of the first inservice test.18T8-3300(d) requires that reference values shall be established at a point(s)ofoperation(reference point)readily duplicated during subsequent tests.18T8-3300(f) requires that all subsequent test results shall be compared to these initial reference values or to new reference values established in accordance with 18T8-3310, 18T8-3320, or 18T8-6200(c).
18T8-5120,"Inservice Testing" (Centrifugal Pumps, Except Vertical Line 8haft Centrifugal Pumps)18T8-5121(e) and 18T8-5123(e),"Group A Test Procedure and Comprehensive Test Procedure", require that all deviations from the reference values shall be compared with the ranges of Table 18T8-5121-1 and corrective action taken as specified in 18T8-6200.
Vibration measurements shall be compared to both the relative and absolute criteria shown in the alert and required action ranges of Table 18T8-5121-1.
For example, if vibration exceeds either 6Vr, or 0.7 in/sec, the pump is in the required action range.N1PVI4 Page 1 of 5 Serial NO.1 0-236A Docket No.50-339 Revised Pump Relief Request P-1 RELIEF REQUEST P-1 (Cont.)ISTB-5220,"Inservice Testing" (Vertical Line Shaft Centrifugal Pumps)ISTB-5221 (e)and ISTB-5223(e),"Group A Test Procedure and Comprehensive Test Procedure", require that all deviations from the reference values shall be compared with the ranges of Table ISTB-5221-1 and corrective action taken as specified in ISTB-6200.
Vibration measurements shall be compared to both the relative and absolute criteria shown in the alert and required action ranges of Table ISTB-5221-1.
Note: There are no ASME Code Classed positive displacement pumps in the North Anna 1ST Program.4.0 Reason for Request The pumps listed in Table P-1 tend to be smooth running pumps.Each pump listed in Table P-1 has at least one vibration reference value (V r)that is currently less than 0.05 inches per second (ips).Small values for V r produce small acceptable ranges for pump operation.
The acceptable ranges are defined in Tables ISTB-5121-1 and ISTB-5221-1 as less than or equal to 2.5V r*Based on a small acceptable range, a smooth running pump could be subject to unnecessary corrective action if the measured vibration parameter exceeds this acceptable range.For very small reference values, hydraulic noise and instrument error can be a significant portion of the reading and affect the repeatability of subsequent measurements.
Also, experience gathered from the North Anna preventive maintenance program has shown that changes in vibration levels in the range of 0.05 ips do not normally indicate significant degradation in pump performance.
To avoid unnecessary corrective action, a minimum value for V r of 0.05 ips has been established for velocity measurements.
This minimum value will be applied to individual vibration locations for the pumps listed in Table P-1 where the measured reference value is less than 0.05 ips.When new reference values are established per ISTB-331 0, ISTB-3320 or6200(c), the measured parameters will be evaluated for each location to determine if the provisions of this relief request still apply.In addition to the requirements of ISTB, the pumps in the ASME Inservice Testing Program are included in the North Anna Predictive Maintenance Program.The North Anna Predictive Maintenance Program currently employs predictive monitoring techniques such as: N1PVI4 Page 2 of 5 Serial NO.1 0-236A Docket No.50-339 Revised Pump Relief Request P-1 RELIEF REQUEST P-1 (Cont.)*vibration monitoring and analysis beyond that required by ISTB,*oil sampling and analysis where applicable (e.g., for pumps with sufficiently large oil reservoirs).
If the measured parameters are outside the normal operating range or are determined by analysis to be trending toward an unacceptable degraded state, appropriate actions are taken that may include:*increased monitoring to establish rate of change,*review of component specific information to identify cause, and*removal of the pump from service to perform maintenance.
It should be noted that all of the pumps in the 1ST Program will remain in the Predictive Maintenance Program even if certain pumps have very low vibration readings and are considered to be smooth running pumps.This alternative to the requirements of ISTB-3300, ISTB-5120 and ISTB-5220, and Table5121-1 and Table ISTB-5221-1 provides an acceptable level of quality and safety.5.0 Proposed Alternative and Basis for Use For the pumps listed in Table P-1, if a measured reference value is below 0.05 ips for a particular vibration measurement location, then subsequent test results for that location may be compared to an acceptable range based on 0.05 ips.In addition to the Code requirements, all pumps in the 1ST Program are included in and will remain in the North Anna Predictive Maintenance Program regardless of their smooth running status.Using the provisions of this relief request as an alternative to the specific requirements of ISTB-3300, ISTB-5120 and ISTB-5220, and Table ISTB-5121-1 and Table ISTB-5221-1 will provide adequate indication of pump performance and continue to provide an acceptable level of quality and safety.Therefore, pursuant to 10CFR50.55a(a)(3)(i), Relief Request P-1 requests relief from the specific ISTB requirements identified in this request.7.0 Duration of the Proposed Alternative The proposed alternative described in Relief Request P-1 will be used for the North Anna Power Station Unit 2 Fourth Ten Year Inservice Testing Interval.N1PVI4 Page 3 of 5 Serial NO.1 0-236A Docket No.50-339 Revised Pump Relief Request P-1 RELIEF REQUEST P-1 (Cont.)7.0 Precedents A similar relief request for the North Anna Unit 2 Third Ten Year Inservice Testing Interval was approved by the NRC in their safety evaluation entitled"North Anna Power Station, Units Nos.1 and 2 Re: Inservice testing Program for Pumps and Valves, Third Ten Year Interval Update (TAC NOS.MB2221 and MB2222)" dated January 28,2002.The following relief requests for other plants that are similar to P-1 were approved by the NRC.Pump Relief Request PRR8 for Beaver Valley 1 was approved by the NRC by letter dated 9/27/2007 (TAC NOS.MD5118-MD5131).Pump Relief Request PRR8 for Beaver Valley 2 was approved by the NRC by letter dated 2/14/2008 (TAC NOS.MD5595-MD5604).8.0 References 1.ASME OM Code, 2004 Edition N1PVI4 Page 4 of 5 RELIEF REQUEST P-1 (Cont.)Table P-1 Serial No.1 0-236A Docket No.50-339 Revised Pump Relief Request P-1 Pump Number Code OM Description Pump Type Pump Speed System Class Group (rpm)1-CH-P-2C Chemical and 1-CH-P-2D Volume Control 2 A Boric Acid Transfer Pumps Centrifugal 3500 2-CC-P-1A 2-CC-P-1 B Component Cooling 3 A Component Cooling Water Pumps Centrifugal 1170 2-CH-P-1B Safety Injection/
High Head Safety Injection/Charging Chemical and 2 A Centrifugal 4820 Volume Control Pump 2-HV-P-20A 2-HV-P-20B Heating and 3 A Control and Relay Room Chilled Centrifugal 3560 2-H\(-P-20C Ventilation Water Pumps 2-HV-P-22A 2-HV-P-22B Heating and 3 A Control and Relay Room Condenser Centrifugal 1760 2-HV-P-22C Ventilation Water Pumps 2-QS-P-1A Quench Spray 2 B Quench Spray Pumps Centrifugal 1780 2-RH-P-1A Residual Heat 2-RH-P-1 B Removal 2 A Residual Heat Removal Pumps Centrifugal 1780 2-RS-P-3A 2-RS-P-3B Recirculation Spray 3 B Casing Cooling Pump Centrifugal 1780 2-SW-P-1B Service Water 3 A Main Service Water Pump Centrifugal 1180 N1PVI4 Page 5 of 5