ML070440482
| ML070440482 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 06/30/2006 |
| From: | - No Known Affiliation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| 3.M.5-2, Rev 10 | |
| Download: ML070440482 (22) | |
Text
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PILGRIM NUCLEAR POWER STATION Procedure No. 3.M.5-2 MAIN STACK INSPECTION GUIDELINE RTYPE H6.03 f l Review REFERENCEUSE 3.M.5-2 Rev. 10
REVISION 10 Paaes Affected 3,8,15-22 4
4,s 6
REVISION 9 Paaes Affected 5
799 9-1 1,13 REVISION 8 Paaes Affected 4
7 REVISION LOG Date Originated 6/06 DescriDtion Add Guy Wire Retensioning Attachment.
Identify PNPS 1.4.54 as retired.
Add Abort, Prejob Brief, and Work Sequence/Plan to Definitions.
Delete parenthetical reference to retired PNPS 1.4.54.
Date Originated 8/04 DescriDtion Add a camera to Special Tools and Equipment.
Formalize the requirement to provide photographs of unsatisfactory conditions.
Provide greater flexibility in the documentation requirements for the Augmented Scope Engineering Review.
Date Originated 4/04 DescriDtion Change the description of Reference 2.0[1] (Calc C15.0.3360) to indicate the applicable revision to be the "current revision".
Correct statement regarding the Augmented Scope inspection frequency for consistency with the intent of Attachment 3.
3.M.5-2 Rev. 10 Page 2 of 22
1.o 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 TABLE OF CONTENTS PURPOSE AND SCOPE REFERENCES DEFINITIONS DISCUSS ION SPECIAL TOOLS AND EQUIPMENT P R EC A U T I 0 N S AND L I M I TAT I 0 N S PREREQUISITES PROCEDURE 8.1 METHOD OF INSPECTION 8.2 REVIEW OF INSPECTION RESULTS ACCEPTANCE CRITERIA CORRECTIVE ACTION ACCEPTANCE VERIFICATION AND SIGNOFF ATTACHMENTS ATTACHMENT 1 -WORKSHEET NO. 1 - BASIC INSPECTION ATTACHMENT 2 - WORKSHEET NO. 2 - AUGMENTED SCOPE ATTACHMENT 3 - INSPECTION SCHEDULE ATTACHMENT 4 - GUY WIRE RETENSIONING Paae 4
4 4
5 5
6 6
7 7
7 8
8 8
8 9
12 14 15 3.M.5-2 Rev. 10 Page 3 of 22
1.0 PURPOSE AND SCOPE The Main Stack and its support system should be inspected at an annual inspection interval to protect public safety and Station operation. The inspection, directed by Maintenance, includes the following:
0 Nine guy wires 0
Nine upper wire connections 0
Nine connections at the ground level Main Stack structure (steel pipe, rings, bolts) and concrete anchor blocks Electrical, lighting, and grounding systems are not included in the scope of the above inspection.
REFERENCES Calculation C15.0.3360 (current revision), "Main Stack Structural Evaluation" Drawing C332A (current revision), "Misc. Structures, Stack, Plans, Elevations, &
Details" PNPS 1.4.54, "Fall Protection" (retired)
Specification No. 6498-C-17, Rev. 3; "Specification for Furnishing and Erection of Off-Gas Stack for Unit No. 1, Pilgrim Station No. 600, Boston Edison Company" US NRC Generic Letter 91 -1 8, Rev. 1 DEFINITIONS L_
Abort - The act of terminating an activity pursuant to abort criteria defined herein.
Auamented ScoDe - The augmented scope of inspection consists of the items identified on Worksheet No. 2 (Attachment 2).
Basic InsDection - This inspection consists of the scope identified in Worksheet No. 1 (Attachment 1).
Dearaded Condition - A condition in which there has been a loss of quality or functional capability (e.g., corrosion, damage, deterioration, deformation, etc.).
3.M.5-2 Rev. 10 Page 4 of 22
[5] Nonconformina Condition - A condition in which there is a failure to meet design requirements (e.g., configuration differs from drawing and specification requirements, degradation exceeds design margin, etc.).
[6]
Preiob Brief - A discussion of the requirements and activities of the work with an emphasis on performing tasks in strict accordance with this Procedure and free of human error. See Attachment 9.1 of EN-HU-102 for guidance on conducting the brief.
[7] Work Seauence/Plan - The plan developed by the Supervisor to address characteristics identified in Enclosure 1 of Attachment 4.
4.0 DISCUSSION The Main Stack is constructed from 30" diameter by 5/8" thick steel pipe and is supported atop the Main Stack Filter Building, located about 700 feet northwest of the Reactor Building. Its top elevation is approximately 400 feet above mean seawater level. It is laterally supported at three different elevations by three guy wires 120 degrees apart. Each guy wire is connected to the stack at the upper end and fastened to a concrete anchor block at the ground level. Guy wire tensions must be maintained within acceptable ranges to limit stack deflections and stresses under design basis wind loading.
SPECIAL TOOLS AND EQUIPMENT Transit (or equal) to check stack alignment (Augmented Scope only)
Shunt type dynamometer (or equal) to check guy wire tension (Augmented Scope only)
Access to wind speed, direction, and air temperature data (Augmented Scope only)
Binoculars for visual inspections of unreachable locations above ground level Radios and phone for emergency communications Safety equipment for worker protection when climbing Camera 3.M.5-2 Rev. 10 Page 5 of 22
6.0 PRECAUTIONS AND LIMITATIONS The following safety precautions shall be observed at all times while performing inspection:
[l]
Authorization must be obtained from the SM prior to the inspection.
[2]
General condition inspection should be performed by experienced and trained personnel using proper safety equipment.
[3] Personnel climbing the stack ladder shall use a full body harness and center rail ladder climbing device and have a means of communication (preferably radio/phone) with ground personnel.
[4] Ground personnel shall be equipped with a radio/phone to permit communications with climbers and the Station.
7.0 PREREQUISITES Prior to performing specific tasks, the performer will:
Complete the following for personnel who sign for steps being completed in Section 7.0:
Name (print)
Initials Notify and obtain permission from the SM immediately prior to starting work.
Initials Notify the PNPS Safety Coordinator.
Initials Verify with Maintenance M&TE that the guy wire tension measuring equipment is properly calibrated. (Augmented Scope only)
Initials Notify Radiation Protection (Red Line control point).
Initials Notify the Security Shift Commander.
Initials Notify Engineering (CiviVStructural).
Initials 3.M.5-2 Rev. 10 Page 6 of 22
METHOD OF INSPECTION INSPECT the as-found condition of the Main Stack and structural support system for degraded and/or nonconforming conditions with respect to the design drawings and specifications (Dwg C332A (current revision) and Spec. 6498-C-17 Rev. 3). Perform a Basic Inspection annually, supplemented with the Augmented Scope every other year, in accordance with the schedule shown in Attachment 3.
DETERMINE whether any structural components are deteriorated, deformed, or damaged, or in a configuration different from required by design using access platforms and ladders wherever possible by performing a close proximity visual inspection. Items not accessible from access platforms and ladders may be inspected with binoculars.
The following requirements apply to the Augmented Scope:
(a)
Measurement of guy wire tensions and stack alignment shall commence only when forecasted weather (wind, precipitation, lighting, etc.) is not expected to endanger personnel or affect the stability of the tension/alignment measurements. The alignment data of interest is the plumb of the stack (horizontal deflection and azimuth) at the three guy attachment elevations, with respect to the stack base.
(b)
Instrumentation required to measure guy wire tensions and stack alignment shall have current calibration records and be operated by qualified personnel.
REPORT inspection results in accordance with the requirements of the worksheets (Attachments 1 and 2) and provide photographs of all conditions determined to be unsatisfactory.
PHOTOGRAPH all conditions determined to be unsatisfactory.
REVIEW OF INSPECTION RESULTS Inspection results shall be submitted to Engineering for review.
Engineering shall review and sign the worksheets (Attachments 1 and 2) and determine any required corrective actions.
3.M.5-2 Rev. 10 Page 7 of 22
9.0 ACCEPTANCE CRITERIA The Procedure was performed as written with findings and data documented on the Work Sheets. Work Sheet No. 1 - Basic Inspection and Worksheet No. 2 - Augmented Scope have been reviewedkigned by Engineering, and corrective actions initiated as necessary to address unsatisfactory items as required in Section 10.0 (Corrective Action).
Additionally, for the Augmented Scope, the as-found guy wire tension values shall be within the following ranges:
Lower guys (7/8" dia.):
8,500 - 9,000 Ib Middle guys (1-1/4" dia.)
11,000 - 16,000 Ib Upper guys (1-3/8" dia.):
16,000 - 19,000 Ib If the guy wire requires retensioning, refer to Attachment 4 (Guy Wire Retensioning).
10.0 CORRECTIVE ACTION W RT(s) generated for repairdrestoration as necessary.
11.O ACCEPTANCE VERIFICATION AND SIGNOFF Maintenance is responsible for reviewing this Procedure to ensure the Acceptance Criteria are satisfied prior to taking credit for Procedure performance.
The Acceptance Criteria of Section 9.0 were: 0 MET 0
NOT MET Maintenance Management signature Date 12.0 AlTACHMENTS ATTACHMENT 1 - WORKSHEET NO. 1 - BASIC INSPECTION ATTACHMENT 2 - WORKSHEET NO. 2 - AUGMENTED SCOPE ATTACHMENT 3 - INSPECTION SCHEDULE ATTACHMENT 4 - GUY WIRE RETENSIONING 3.M.5-2 Rev. 10 Page 8 of 22
WORK SHEET NO. 1 - BASIC INSPECTION CONDITION OF GUY WIRES, CONNECTIONS, AND STACK EXTERIOR SURFACES Perform the following inspections and provide descriptions and photographs of all conditions determined to be unsatisfactory.
[l]
At each reinforced concrete deadman anchor block, inspect the concrete block for evidence of cracking, spalling, or any other form of deterioration. Inspect the surrounding ground area for evidence of block movement, soil erosion, interfering vegetation growth, or any other unusual conditions.
North Block Sat[ 1 Unsat[ ]
West Block Sat[ 1 Unsat[
3 South Block Sat[ 1 Unsat [
3
[2] At each reinforced concrete deadman anchor block, inspect the 2 thick embedment plate, the threaded eye bars and cotter pins, wire rope bridge sockets, vibration dampers, and electrical ground wire connections for each of the three guys for coating failure, corrosion, pitting, loose parts, damage, evidence of deformation, movement or wear, or any other unusual conditions.
North Block Sat[ 1 Unsat [ ]
West Block Sat[ 1 Unsat[ ]
South Block Sat[ 1 Unsat[ ]
[3]
At the guy wire attachment points to the Main Stack, inspect the connection plates and the open wire rope sockets and cotter pins for each of the three guy wires for coating failure, corrosion, pitting, damage, evidence of deformation, movement or wear, or any other unusual conditions.
Guv 8 El. 165 ft Sat [ ]
Unsat [ ]
Guv 8 El. 265 ft Sat[ ]
Unsat[ ]
Guv 8 El. 365ft Sat[ ]
Unsat[ ]
3.M.5-2 Rev. 10 Page 9 of 22
ATTACHMENT 1 1
Sheet 2 of 3
[4]
At each of the nine guys, inspect the entire length of the wire for corrosion, damage, interfering vegetation growth, evidence of deformation or wear, broken strands, or any other unusual conditions.
7/8 Guv 8 North Block 1-1/4 GUV 8 North Block 1-3/8 GUV Q North Block 7/8 Guv Q West Block 1-1/4 Guv 8 West Block 1-3/8 Guv Q West Block 7/8 Guv Q South Block 1-1/4 GUY 8 South Block 1-318 GUV Q South Block Sat[ ]
Unsat[ ]
Sat[
3 Unsat[ ]
Sat[ ]
Unsat[ ]
Sat[ ]
Unsat[ ]
Sat[ ]
Unsat[
Sat[ ]
Unsat[
Sat[ ]
Unsat[
Sat[
3 Unsat[
Sat[ ]
Unsat[ ]
[5]
At all Main Stack pipe sections, inspect bolted connections for coating failure, corrosion, pitting, loose fasteners, damage, evidence of deformation, movement or wear, or any other unusual conditions:
Stack Base and Seven Bolted Flanaes (Ref: DWQ C332A. Details 2 and 7)
Base 8 El. 95 Sat[ 1 Unsat [
3 Flange @ El. 136 Sat[ 1 Unsat[ ]
Flange Q El. 177.75 Sat [
3 Unsat [ ]
Flange 8 El. 219.54 Sat [ ]
Unsat [ ]
Flange 8 El. 261.33 Sat[
3 Unsat[ ]
Flange 8 El. 303.05 Sat [ ]
Unsat [ ]
Flange 8 El. 344.81 Sat [ ]
Unsat [ ]
Flange 8 El. 386.59 Sat [ ]
Unsat[ ]
3.M.5-2 Rev. 10 Page 10 of 22
[6]
Inspect pipe segment exterior surfaces for coating failure, corrosion, pitting, damage, or any other unusual conditions:
Eiaht Pipe Seaments El. 95 to 136 Sat[ 1 Unsat[ ]
El. 136 to 177.75 Sat[ 1 Unsat[ ]
El. 177.75 to 219.54 Sat [ ]
Unsat[ ]
El. 219.54 to 261.33 Sat [ ]
Unsat[ ]
El. 261 -33 to 303.05 Sat [
3 Unsat[ ]
El. 303.05 to 344.81 Sat [
3 Unsat[ ]
El. 344.81 to 386.59 Sat [
3 Unsat[ ]
El. 386.59 to 400 Sat[ 1 Unsat[
3
[71 Engineering Review Evaluation of Conditions Identified as Unsatisfactory by the Basic Inspection:
Condition:
Evaluation:
Condition:
Eva1 uation:
Condition:
Eva1 uat io n :
Prepared by:
Mechanical/Civil/Structural Engineer Reviewed by:
MechanicaVCiviI/StructuraI Mgr Date Date 3.M.5-2 Rev. 10 Page 11 of 22
1 ATTACHMENT 2 1
Sheet1 of2 WORK SHEET NO. 2 - AUGMENTED SCOPE GUY WIRE TENSIONS AND STACK ALIGNMENT
[ l ]
Measure existing guy wire tensions with a calibrated device approved by Engineering.
Provide the following data:
North Guvs Date:
Startof shift:
Temp.
Wind Speed Direction Guy Tensions: 7/8 1-114 1 -318 End of shift:
Temp.
Wind Speed Direction West Guvs Date:
0 Start of shift:
Temp.
Wind Speed Direction Guy Tensions: 7/8 1 -1/4 1 -3/8 End of shift:
Temp.
Wind Speed Direction South Guvs Date:
Start of shift:
Temp.
Wind Speed Direction Guy Tensions: 7/8 1 -1/4 1-318 End of shift:
Temp.
Wind Speed Direction 3.M.5-2 Rev. 10 Page 12 of 22
r Sheet 2 of 2 Measure existing stack alignment from positions on two azimuths approximately 90 degrees apart with a calibrated device approved by Engineering. Alignment data shall be the horizontal deflection from plumb at each guy location referenced to the stack base. Furnish a sketch showing locations chosen for instrument setup and provide the following data:
Position A (Instrument in northeast quadrant, looking southwest)
Start of shift: Temp.
Wind Speed Direction Deviation:
El. 165 El. 265 El. 365 End of shift: Temp.
Wind Speed Direction Position B (Instrument in southeast quadrant, looking northwest)
Start of shift: Temp, Wind Speed Direction Deviation:
El. 165 El. 265 El. 365 End of shift: Temp.
Wind Speed Direction
[3]
Engineering Review NOTE If any data is Unsat, a Condition Report shall be initiated and identified.
The Augmented Scope data have been determined to be:
Sat[ ]
Unsat[ ]
The basis for this conclusion is as follows:
Prepared by:
MechanicaI/CiviI/StructuraI Engineer Date Reviewed by:
Mechanical/Civil/Structural Mgr Date 3.M.5-2 Rev. 10 Page 13 of 22
r Sheet 1 of 1 INSPECTION SCHEDULE Year 2004 2005 2006 2007 2008 2009 201 0 201 1 201 2 Activitv Basic Inspection and Augmented Scope Basic Inspection Basic Inspection and Augmented Scope Basic Inspection Basic Inspection and Augmented Scope Basic Inspection Basic Inspection and Augmented Scope Basic Inspection Basic Inspection and Augmented Scope 3.M.5-2 Rev. 10 Page 14 of 22
GUY W I RE RETENSlONl NG The purpose of this Attachment is to define procedural controls and requirements for adjusting Main Stack guy wire tension when postsurveillance corrective actions are assigned to do so.
Guy wire retensioning differs slightly from the Augmented Scope activities because changes to cable loads will affect the plumb of the Main Stack and the two parameters must be coordinated. Guy wire tension adjustment requires the heavy hex nuts that secure the guy wire anchor head to be repositioned on the threaded rods embedded in the concrete deadman. Concurrently, the structure is monitored with survey instruments to ensure it is maintained in a plumb configuration. These activities may require multiple set-ups and adjustments to achieve the acceptance criteria for required cable tension and structure plumb; and the work sequence is dependent on the experience and skill of the crew. To retain the necessary flexibility to achieve effective results, the actual work steps are documented in a Work Sequence/Plan outside of this Procedure, but approved by Engineering and included in the Work Package.
1.o RESPONSI BI LIT1 ES
[ 11 Engineering - The assigned Entergy MechanicaVCiviVStructural Engineer is responsible for approval of the Work Sequence/Plan for guy wire retensioning.
[2] Supervisor - The assigned Entergy Maintenance Supervisor is responsible for coordination of plant interfaces, and for directing and controlling the work activities being performed to implement the Work Sequence/Plan approved by Engineering.
[3]
M&TE Supervisor - The Entergy M&TE Supervisor is responsible to ensure the dynamometer being provided by the Tool Room is properly calibrated.
2.0 ABORT CRITERIA Termination of this activity based on any of the criteria below should be accomplished by stopping work in a manner that leaves the Main Stack guy wires in a safe condition.
[l]
Guy wire retensioning is performed in conjunction with optical surveying instruments to monitor the vertical alignment of the stack. Wind gusts can cause stack motions interfering with alignment measurements. If such conditions develop, the Supervisor should abort this activity.
[2] Any newly identified or emergent condition which could affect the safety of personnel or the Main Stack shall be immediately brought to the attention of the Supervisor and referred to Engineering for review. Work should be suspended pending this review. If the determination is that it is unsafe to continue, the Supervisor should abort this activity.
3.M.5-2 Rev. 10 Page 15 of 22
[3]
Failure of any equipment necessary for safety and accuracy of the work being performed (e.g., PPE for climbing the stack, radios for communications, dynamometer for guy wire tension measurements, optical surveying instruments for stack alignment measurement, etc.) shall be immediately brought to the attention of the Supervisor. If the condition cannot be rectified in a timely fashion, the Supervisor should abort this activity.
[4]
Illness or injury of any individual during the implementation of the work shall be immediately brought to the attention of the Supervisor. If the condition could potentially prevent the remaining work from being performed safely and correctly, the Supervisor should abort this activity.
3.0 PRECAUTIONS AND LIMITATIONS The following safety precautions shall be observed at all times while performing inspection:
[l] Authorization must be obtained from the Shift Manager prior to commencing the work.
[2]
Work should be performed by experienced and trained personnel using proper safety equipment (PNPS 1.4.54).
[3]
Personnel climbing the stack ladder shall use a full body harness and center rail ladder climbing device and have a means of communication (radio/phone) with ground personnel.
[4]
Ground personnel shall be equipped with a radio/phone to permit communications with climbers and the Station.
[5]
The Supervisor shall provide a work sequence/plan for approval by Entergy in accordance with Enclosure 1 of this Attachment.
3.M.5-2 Rev. 10 Page 16 of 22
4.0 PREREQUISITES Prior to entering the Initial Conditions, the Supervisor will:
Verify that the Work SequencelPlan has been approved by Engineering.
Initials Verify with M&TE Supervisor that the guy wire tension measuring equipment is properly calibrated.
Initials Immediately prior to starting work, notify the following personnel:
Shift Manager Initials PNPS Safety Coordinator Initials Radiation Protection (Red Line control point)
Initials Security Shift Commander Initials
[4] Names of personnel involved with the performance of activities described in this Attachment are listed below, and their initials acknowledge that they read and understand this Attachment.
Name (print)
Initials 3.M.5-2 Rev. 10 Page 17 of 22
1 5.0 INITIAL CONDITIONS
[l]
Prerequisites have been completed.
[2]
A prejob brief is conducted by the Supervisor with all personnel involved in the performance of activities described in this Attachment.
[3]
All required equipment and tools are verified to be functional and staged at the work site.
[4]
Wind conditions are calm and not expected to change in a manner leading to an abort.
6.0 PROCEDURE
[l]
The Supervisor directs the work to proceed in accordance with the Entergy-approved Work Sequence/Plan.
[2]
The final, as-left, guy wire tension values are recorded in.
[3] The as-found and as-left measured Main Stack deflections at the guy wire attachments are recorded in Enclosure 3.
[4]
Guy wire measurementkensioning equipment is demobilized and postwork inspections performed to verify that the guy wire anchor head hardware have been properly restored to the design configuration.
Initials Initials Initials Initials Initials Initials Initials Initials 3.M.5-2 Rev. 10 Page 18 of 22
ATTACHMENT 4 I
Sheet5of8 7.0 ACCEPTANCE CRITERIA
[l]
Final guy wire tension values shall meet the acceptance criteria in Section 9.0 of the base Procedure.
[2] The final alignment of the stack from the plumb condition should be equal to or better than (i.e., closer to plumb) the initial alignment within a tolerance of +1 inch.
8.0 ENCLOSURES ENCLOSURE 1 - WORK SEQUENCWPLAN APPROVAL ENCLOSURE 2 - GUY WIRE RETENSIONING FINAL RESULTS ENCLOSURE 3 - STACK ALIGNMENT AFTER GUY WIRE RETENSIONING 3.M.5-2 Rev. 10 Page 19 of 22
E Sheet 6 of 8 ENCLOSURE 1 -WORK SEQUENCWPLAN APPROVAL A detailed Work Sequence/Plan shall be developed by the Supervisor for review and approval by Engineering. The approved plan shall describe the items listed below as a minimum and be incorporated into the Work Package as a reference:
Equipment and set-up to accomplish guy wire tension adjustments and measurements.
Sketch showing set-up locations of optical survey instruments.
Crew size, responsibilities, and locations during the work.
Methods to coordinate and control crew actions to ensure the work is performed as planned. include discussions of primary and backup communications equipment and hand signals for emergency communications with climbers.
Expected work sequence (e.g., adjust lower guy wires from west deadman anchor block first, then middle guy wires from west anchor block, then upper guy wires from the south and/or north anchor blocks) and measures to ensure stack alignment is continuously controlled during tension adjustments. Discuss conditions under which it may become necessary to vary the work sequence.
The Work Sequence/Plan has been reviewed and approved and enclosed in the MR package.
Cognizant M/C/S Engineer Date Name (print)
Initials 3.M.5-2 Rev. 10 Page 20 of 22
t ATTACHMENT 4 1
Sheet7of8 ENCLOSURE 2 - GUY WIRE RETENSIONING FINAL RESULTS Start of Work Air Temperature Wind Speed Wind Direction North Guv Tensions Lower (7/8")
Middle (1-1/4")
Upper (1 -3/8" )
West Guv Tensions Lower (7/8")
Middle (1 -1 /4")
Upper (1 -3/8")
South Guv Tensions Lower (7/8")
Middle (1 -1/4")
Upper (1 -3/8")
End of Work Air Tern pe ratu re Wind Speed Wind Direction 3.M.5-2 Rev. 10 Page 21 of 22
ENCLOSURE 3 - STACK ALIGNMENT AFTER GUY WIRE RETENSIONING W
Instruction: Show to scale a point with dimensions representing the position of the centerline of the stack at the guy location, with respect to centerline of the stack at the base, in the applicable quadrant. In this case the stack "base" is the lowest visible elevation which can be seen from the set-up locations of the optical survey instruments.
E NOTE North is defined by the PNPS convention shown on Drawing C322A, which differs from true
/north.
Initial Condition: As-found deflection with respect to the stack base Lower Guv Attachment Middle Guv Attachment N
N Final Condition: As-left deflection with respect to the stack base Lower Guv Attachment Middle Guy Attachment N
N U mer G uv Attachment N
Umer Guv Attachment 3.M.5-2 Rev. 10 Page 22 of 22