ML20101C742
| ML20101C742 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 11/28/1984 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 645, IEB-82-02, IEB-82-2, NUDOCS 8412210176 | |
| Download: ML20101C742 (10) | |
Text
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VIRGINIA ELECT,RIC AND PowsRGOMPANY.
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.m unbiA Rrcunown,VrmoxxrA 20261
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November 28, 1984 Mr.-James P. O'Reilly Serial No.
'645 Regional' Administrator N0/JHL/Ims U. S. Nuclear Regulatory Con: mission Decket No..50-338 Region II License No.
NPF-4 101 Marietta Street, Suite 2900 Atlanta, Georgia.30323
Dear Mr. O'Reilly:
VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNIT NO. 1 RESPONSE TO I.E. BULLETIN 82-02 Enclose <*. is the response to I.E.
Bulletin 82-02, " Degradation of Threaded Fasteners in the Reactor Coolant Pressure Boundary of PWR Plants" for North Anna Unit No.
1.
Specifically, this information is in response to items 4.b and 4.c.
Per the telephone conversation between Mr. R. J. Hardwick (Vepco) and Mr. S. A. Elrod (NRC), on November 26, 1984, an extension until November 27, 1984 was granted to respond to the bulletin.
Pursuant to Section 182a, Atomic Energy Act of 1954 as amended, the information contained in the enclosure is true and accurate to the best of my knowledge and belief.
Very truly yours, m
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W. L. Stewart Enclosure cc:
Mr. R. C. DeYoung Director Office of Inspection and Enforcement Washington, D. C. 20555 1
Mr. M. W. Branch NRC Resident Inspector North Anna Power Station
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RESPONSE TO ITEM 4.b & 4.c 0F IEB 82-02:
DEGRADATION OF THREADED FASTENERS IN THE REACTOR COOLANT PRESSURE BOUNDARIES OF PWR PLANTS The. following information is being submitted as required by Action Items 4.b and 4.c of IEB 82-02 for North Anna Unit 1.
All other items have been previously answered and submitted.
Stud inspection for North-Anna Unit 2 was submitted July 28, 1983.
4.b For Action Item 2 of IEB 82-02 all threaded fasteners identified in the at least response to Action Item 3 of IEB 82-02 were inspected visually.
Where it.was necessary to remove threaded fasteners for maintenance,- the fasteners were either reinspected as required prior to reuse or replaced.
See Supplement 1 for the identification of the fasteners inspected.
4.c The results of the inspections performed on the items referred to in Supplemenc 1 are provided in Supplement 2.
All stud corrosion observed was localized pitting and scaling with the exception of MOV-1700 which exhibited wastage on 8 out of 24 closure studs.
~The total staff time spent to prepare a written response for Item 4.b and 4.c for North Anna Unit I was 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br />.
The radiation exposure attributed to the initial and subsequent visual inspection was 600 mR excluding NDT inspections.
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'V SUPPLEMENT 1 IDENTIFICATION OF RCPB BOLTING MATERIAL WITHIN THE SCOPE DEFINED IN IEB 82-02 BASIS (1)- Steam Generator and Pressurizer aanway closures (2) Valve bonnets and pump flange connections in piping 6" or greater BOLTING MATERIAL TO BE CONSIDERED 1.
Loop Stop Valves UNIT 1 A Loop T MOV-1590 g
MOV-1591 T"C B Loop T MOV-1592 H
T MOV-1593 C
C Loop T MOV-1594 MOV-1595 C
2.
Loop Stop Bypass Valves A Loop MOV-1585' B Loop MOV-1586 C Loop MOV-1587-3.
Reactor Cooling Pump Casing And Seal Housing-1A RCP 18 RCP IC RCP 4.
Steam Generator Manway Bolting (Primary side only)
IA IB 1C 5.
Pressurizer Manway Bolting 1-RC-E-2 6.
Residual Heat Removal System Isolation Valves MOV-1720A=
MOV-17205 MOV-1700 MOV-1701 7.-
S.I. Accumulator Discharge to the Loops l
SI-TK-1A (ATc) 1-SI-127 1-SI-125 SI-TK-1B (BTc) 1-SI-144 1-SI-142 l
SI-TK-1C (CTc) 1-SI-161 1-SI-159 l
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Safety Injection to Loops UNIT 1 1-SI-83
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A Loop Tc 1-SI-195 1-SI-86 B Loop Tc 1-SI-197 1-SI-89 C Loop.Tc 1-SI-199 Header to Loops-MOV-1890C MOV-1890D 1-SI-99 A Loop Tg 1-SI-209 1-SI- 06 B Loop TH 1-SI-95 1-SI-211 C Loop TH 1-SI-103 1-SI-213 1-SI-207 Header to Loops MOV-1890A-MOV-18905 9.
Pressurizer Safety Valves SV-1551A
'SV-15515 SV-1551C 9
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5 SUPPLEMENT 2 RESULTS OF THREADED FASTENER INSPECTION UNIT 1 MATERIAL EXAMINED BOLTING MATERIAL IN PLACE / REMOVED INSPECTION RESULTS
- 1. Loop Stop Valves "A" Loop T MOV-1590 IN PLACE Packing leakage was noted. The packing was H
adjusted and fasteners cleaned satisfactorily.
No fastener damage was noted by visual inspection.s "A" Loop T MOV-1591 IN PLACE No valve leakage nor fastener damage was noted by C
visual inspection.
"B" Loop T MOV-1592 IN PLACE No valve leakage nor fastener damage was noted by H
visual inspection.
"B" Loop T MOV-1593 IN PLACE No valve leakage nor fastener damage was noted by H
visual inspection.
"C" Loop T MOV-1594 IN PLACE Packing leakage was noted. The packing was H
adjusted and fasteners cleaned satisfactorily.
No fastener damage was noted by visual inspection.
"C" Loop T MOV-1595 IN PLACE No valve leakage nor _ fastener damage was noted by H
visual inspection.
- 2. Loop Stop Bypass Valves
" A" Loop MOV-1585 IN PLACE No valve-leakage nor fastener damage was noted by visual inspection.
"B" Loop MOV-1586 IN PLACE No valve leakage was noted.
Fastener damage by
. corrosion was noted (rust.. cause unknown). ' All ~
fasteners were' replaced.
"C" Loop MOV-1587
.IN PLACE No valve leakage nor; fastener dacage was noted by visual' inspection.
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SUPPLEMENT 2 RESULTS OF THREADED FASTENER INSPECTION UNIT 1-MATERIAL EXAMINED BOLTING MATERIAL IN PLACE / REMOVED INSPECTION RESULTS 3.
Reactor Coolant Pump Casing and Seal Housing "1A" RCP IN PLACE No leakage nor fastener damage was noted by visual inspection.
"lB" RCP IN PLACE No leakage nor fastener damage was noted by visual inspection.
"1C" RCP' IN PLACE No leakage nor fastener damage was noted by visual inspection.
4.
Steam Generator Manway Bolting (Primary Side Only)
"lA" REMOVED The fasteners were removed and inspected "lB" REMOVED visually and by magnaflux inspection IAW "lC" REMOVED 2210 and 2211 of ASME XI.
No problems with boric acid degradation was.noted.
5.
Pressurizer Manway Bolting 1-RC-E-2 IN PLACE No leakage nor fastener damage was noted by visual inspection.
6.
Residual Heat Removal System Isolation Valves 1-RH-MOV-1720A IN PLACE No valve leakage nor fastener damage was noted by visual inspection.
1-RH-MOV-1720B IN PLACE No valve leakage nor fastener damage was noted by visual inspection.
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SUPPLEMENT 2 RESULTS OF THREADED FASTENER INSPECTION UNIT 1 MATERIAL EXAMINED BOLTING MATERIAL IN PLACE / REMOVED INSPECTION RESULTS
- 6. (cont.)
1-RH-MOV-1700 REMOVED Body to bonnet leakage and stud degradation was noted. The body to bonnet gasket was replaced and all studs replaced.
1-RH-MOV-1701 IN PLACE Packing; leakage was noted. The packing was replaced and fasteners cleaned. No fastener
' degradation was noted.
7.
S. I. Accumulacor Discharge to the Loops SI-TK-1A (AT )
1-SI-127 IN PLACE ik) valve leakage nor fastener damage was noted by visual inspection.
1-SI-125 IN PLACE No valve leakage nor fastener damage was noted by visual inspection.
SI-TK-1B (BT )
1-SI-144 IN PLACE
-No valve leakage nor fastener damage was noted by.
visual inspection.
1-SI-142 IN PLACE No valve leakage nor fastener damage was noted by visual inspection.
SI-TI-lC (CT )
g 1-SI-161 IN PLACE
-No valve leakage nor fastener' damage was'noted by
-visual inspection.
1-SI-159 IN PLACE No-valve leakage nor fastener damage was.noted by-visual. inspection.
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, n.a SUPPLEMENT 2 RESULTS OF THREADED FASTENER INSPECTION UNIT'1-MATERIAL' EXAMINED ~
1 1-BOLTING MATERIAL IN PLACE / REMOVED INSPECTION RESULTS 8.
Safety Injection to Loops i
'"A" Loop T o.
1-SI IN PLACE Nol valve' leakage nor fastener damage was noted.
1-SI-209 IN PLACE No' valve. leakage nor fastener damage was noted.
. SI-206 IN PLACE No valve leakage nor fastener damage was noted.
"B" Loop To..
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1-SI-95 IN PLACE No valve leakage nor fastener damage was noted.
g, 1-SI-211
- IN' PLACE No valve. leakage nor fastener damage'was noted.t i,.
't "C" Loop T,,
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l-SI-103 REMOVED Boric acid was present from a source.other than
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g the valve. The studs were cleaned and-j w=;
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visually; inspected satisfactorily.
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IN PLACE' No -falve leakage nor fastener damage was noted.
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1-SI-213
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SUPPLEMENT 2-g
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RESULTS OF THREADED FASTF._ER' INSPECTION UNIT 1 N
g... ;C MATERIAL EXAMINED M
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'IN PLACE / REMOVED INSPECTION RESULTS
' BOLTING MATERIAL
1-SI-207 IN PLACE No valve leakage nor fastener damage was noted
' Header to Loops MOV-1890A IN' PLACE No valve leakage nor fastener damage was noted
^
-MOV-1890B IN PLACE No valve leakage.nor fastener damage was noted "A" Loop T,,
1-SI-83 IN PLACE No valve leakage nor fastener damage was noted.
1-SI-195 IN PLACE No valve leakage nor fastener damage was noted.
"B" Loop T,,
1-SI-86 IN PLACE-Body to bonnet leakage and stud degradation was noted. The body-to bonnet gasket was replaced and all studs replaced.
1-SI-197 IN PLACE Body to bonnet-leakage and stud degradation was-noted. The body to bonnet gasket was replaced i
and all studs replaced.
"C" Loop T,,
1-SI-89 IN PLACE No valve leakage nor fastener damage was noted.
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r SUPPLEMENT 2 RESULTS OF THREADED FASTENER INSPECTION UNIT 1-MATERIAL EXAMINED BOLTING MATERIAL.
'IN' PLACE / REMOVED INSPECTION RESULTS 1-SI-199
.IN PLACE No valve leakage nor fastener damage'was noted.
Header to' Loops MOV-1890C IN PLACE A slight-packing leak was noted. The packing was-replaced. No stud degradation was noted.
MOV-1890D IN PLACE No valve. leakage nor fastener damage was noted.
-Pressurizer Safety Valves SV-1551A REMOVED /IN PLACE No valve leakage nor fastener damage was noted.
SV-1551B REMOVED /IN PLACE No valve leakage.nor fastener damage was noted.
SV-1551C REMOVED /IN PLACE No valve leakage nor fastener damage was noted.
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