ML20206T843
| ML20206T843 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 12/11/1985 |
| From: | Hilgenkamp J, Meacham J NEBRASKA PUBLIC POWER DISTRICT |
| To: | |
| Shared Package | |
| ML20206T643 | List: |
| References | |
| 6.3.10.16, TAC-54682, NUDOCS 8607080238 | |
| Download: ML20206T843 (7) | |
Text
- - _ _
UUUPt R !!UCLEAR STAT 10N UPERA110Nb MANUML.
CHF.0; VALVES IN COOLING SYSTEM OF DIESEL SURVEILLANCE PROCEDURE 6.3.10.16 GENERATORS INTEGRITY VERIFICATION I.
PURPOSE A.
The purpose of this Surveillance Procedure is to provide a deta: led instruction for station personnel to verify the integrity of the check valves in the direct flow path of cooling water for the diesel gener-ators.
II.
DISCUSSION A.
Operating experience indicates that numerous check valve failures have occurred in systems important to safety in nuclear power plants. This procedure specifically addresses the inspection of check valves SW-CV-35CV, SW-CV-36CV, SW-CV-37CV and SW-CV-38CV, all of.which are in the direct flow path of cooling water for the diesel generators.
If possible, perform with Surveillance Procedure 6.3.12.6, Diesel Generator Annual Inspection.
B.
To visually inspect the internals of these check valves it will be necessary to isolate the applicable. service water (SW) flow to the residual heat removal (RHR) booster pumps and to the Reactor Building closed cooling water heat exchangers.
III. REFERENCE MATERIAL A.
CNS Inservice Testing Program.
B.
C.
Flow Diagrams.
1.
B & R Drawing 2006, Sheet 1.
2.
B & R Drawing 2006, Sheet 3.
3.
B & R Drawing 2077.
D.
Anchor Darling Drawing 1742-3.
IV.
PREREQUISITES A.
SW-CV-35CV And SW-CV-37CV.
1.
Prior to isolating SW flow to these check valves, ensure that the plant parameters will allow the removal of RHR heat exchanger B and REC heat exchanger A from service.
8607080238 860630 PDR ADOCK 05000 8
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Rsvised By/Date Reviewed By/Date r
By Rev Procedure Page 1 Of J. Hilgenkamp 9/23/85
.T. Meacham 12/10/85 jg,/f.gg-0 6.3.10.16 4
Pages
E 2.
The isolated line vented and drained.
3.
A Maintenance Work Request obtained.
B.
SW-CV-36CV And SW-CV-38CV.
s 1.
Prior to isolating SW flow to these check valves, ensure that the plant parameters will allow the removal of RHR heat exchanger A and REC heat exchanger B from service.
2.
The isolated line vented and drained.
Q 3.
A Maintenance Work Request obtained.
l V.
LIMITATIONS A.
Surveillance Requirements - Technical Specifications.
1.
None.
B.
Administrative Limits.
1.
Attachment "A" shall be used to r,ecord the results of the inspection and filed as part of the station records.
2.
All inspections shall be coordinated with the Control Room Operator.
3.
Integrity shall be verified once per 3 years.
VI.
PRECAUTIONS A.
Observe the applicable Technical Specifications.
VII. TEST EQUIPMENT A.
None.
~ VII
I. PROCEDURE
Note: Prior to isolating SW to the diesel generator check valves, ensure that the plant's cooling requirements (REC and RHR) can be met with one SW loop.
A.
Disassembly.
1.
Insure that operations has isolated and tagged out the subject check valves.
2.
Remove the bonnet nuts (cap) (20) from the bonnet studs (cap) (19).
Note: Refer to Attachment "B" for reference designations.
_Procsdure Number 6.3.10.16 Date A3.//,ES Revision 0
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S 3.
Remove the cap (bonnet) (2) from the body (1).
4.
Remove the hinge pin (5) from the hinge (3) and body (1).
5.
Remove the gasket (hinge pin) (18A).
6.
Remove the cotter pin (4C), disc nut (4B), and dise washer (4A) from the disc (4).
7.
Remove the disc from the hinge (3).
8.
Remove the gasket (18) from the bocy (1).
B.
Inspection.
1.
Insure that the Disassembly Section is completed.
2.
Clean and liquid penetrate test the valve disc," pivot arm, and hinge pins.
3.
Examine the bore of the pivot arm.
4.
Examine the stud and nut assembly.
5.
Examine the valve hinge pin and valve hinge pin bore.
6.
Examine the valve bady and internal parts general condition for pitting, corrosion, wrosion, foreign material, gauges, wear, and cracks.
C.
Reassembly.
1.
Insure that the Inspection Section is completed.
2.
Assemble the disc (4) to the hinge (3).
3.
Install the dise washer (4A), disc nut (4B), and cotter pin (4C).
4.
Assemble the hinge (3) to the body (1).
5.
Insert the hinge pin (5) into the body (1) and hinge (3).
6.
Install the gasket (hinge pin).
7.
Insure that the hinge / disc assembly operates freely by exercising the assembly.
8.
9.
Assemble the bonnet (2) to the body (1).
Procidure Number 6.3.10.16 Date
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10.
Assemble the bonnet nuts (20) to the bonnet studs (19) and torque to 200 ft. lbs.
Note: Record the identification number of the torque wrench used on Attachment "A".
IX.
ATTACHMENT A.
Check Valves In Cooling System Of Diesel Generators Integrity Verifi-cation Data Sheets.
B.
Figure I.
l I
I 1
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4 Procsdure Number 6.3.10.16 Date
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...r..
vrunnituna haavnu uvvi un avuuun oinitun CHECK VALVES IN COOLING SYSTEM OF DIESEL ATTACHMENT "A" SURVEILLANCE PROCEDURE 6.3.10.16 GENERATORS INTEGRITY VERIFICATION l
I CHECK VALVES IN COOLING SYSTEM OF DIESEL GENERATORS INTEGRITY VERIFICATION l
l 1
SW-CV-35 SW-CV-36 AND AND PROCEDURE SW-CV-37 SW-CV-38 A.
Disassembly.
XXXXXXXX
.MM 1.
Insured that operations has isolated and tagged out XXXXXXXX XXXXXXXX subject check valves.
~
2.
Removed bonnet nuts (cap) from bonnet studs (cap).
3.
Removed cap (bonnet) from body.
4.
Removed hinge pin from hinge and body.
5.
Removed gasket (hinge pin).
6.
Removed cotter pin, dise nut, and disc washer.
7.
Removed disc from hinge.
8.
Removed gasket from body.
j B.
Inspection.
XXXXXXXX XXXXXXXX 1.
Insured that Disassembly Section is completed. -------------------
2.
Cleaned and liquid penetrate tested valve disc, XXXXXXXX XXXXXXXX pivot arm, and hinge pins.
3.
Examined bore of pivot arm. ------------- '
4.
Examined stud and nut assembly.
5.
Examined valve hinge pin and valve hinge pin bore.
6..
Examined valve body and internal parts general XXXXXXXX XXXXXXXX condition for pitting, corrosion, erosion, foreign XXXXXXXX XXXXXXXX material, gauges, wear, and cracks.
Q.C. Check Point.
C.
Reassembly.
1.
Insured that Inspection Section is completed.
~
2.
Assembled disc to hinge.
3.
Installed disc washer, dise nut, and cotter pin.
4.
Assembled hinge to body.
5.
Inserted hinge pin into body and hinge. ---
6.
Installed gasket (hinge pin).
7.
Insured that hinge / disc assembly operates freely XXXXXXXX XXXXXXXX i
by exercising assembly.
3 Q.C. Check Point.
8.
9.
Assembled bonnet to body.
10.
Assembled bonnet nuts to bonnet studs and torqued XXXXXXXX XXXXXXXX 4
to 200 ft. lbs.
Q.C. Check Point.
Torque Wrench Identificacion Number:
t J
Procsdure Number 6.3.10.16 Date /-O_//.Jhr Revision 0
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CHECK VALVES IN COOLING SYSTEM OF DIESEL ATTACHMENT "A" SURVEILLANCE PROCEDURE 6.3.10.16 GENERATORS INTEGRITY VERIFICATION 1
CHECK VALVES IN COOLING SYSTEM OF DIESEL GENERATORS INTEGRITY VERIFICATION Discrepancies:
j Operator
/
Date Shift Supervisor
/
Permission To Start Date Shif t Supervisor
/
Test Complete And Reviewed Date Shift Supervisor
/
NCR Written If Required._
Date Work Item (s) Initiated If Required Reviewed By
/
l-IST Review
/
Analysis Of Test Data Comparing To Date Date Allowable Ranges IST Review
/
Summary Of Corrective Actions If
'~
Date Required
~
IST Review
/
Subsequent IST And. Confirmation Of Date.
Operational Adequacy I
l
.I
?rocsdure Number 6.3.10.16 Date esS//-JEr Revision 0
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Pages
LUUrta NULLt.AK b1A110N UrtitA110d3 MANUAL CllECK VALVES IN COOLING SYSTEM OF DIESEL ATTAClefENT "B" SURVEILLANCE PROCEDURE 6.3.10.16 GEMERATORS INTEGRITY VERIFICATION FIGURE I i
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ITEM ITEM NUMBER DESCRIPTION NUMBER.
DESCRIPTION 1
Body 2
Cap (Bonn) 3A Stopper (Hinge) 13 Seat Ring (Stellite Faced) 3 Hinge 18 Gasket (Cap) 4 Disc (Stellite Faced) 18A Casket (Hinge Pin) 4A Washer (Disc) 19 Stud (Cap) 4B Nut (Disc) 20 Nut (Cap) Hex Heavy 4C Cotter Pin (Disc) 68 Name Plate 5
Hinge Pin (HT to 310-331 BHM)
Proc: dure Number 6.3.10.16 Date
/a_//.PS Revision 0
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Of 1
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