ML20055C056
| ML20055C056 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 08/02/1982 |
| From: | Larson C NORTHERN STATES POWER CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| REF-SSINS-6820 IEB-82-02, IEB-82-2, NUDOCS 8208100080 | |
| Download: ML20055C056 (4) | |
Text
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Northern States Power Company 414 N collet Mall Minneapohs. Minnesota 55401 Telephone (612) 330-5500 August 2, 1982 Mr James G Keppler l
Regional Administrator-III U S Nuclear Regulatory Commission l
799 Roosevelt Road l
Glen Ellyn, IL 60137 l
l
Dear Mr Keppler:
PRAIRIE ISLAND NUCLEAR GENERATING PLANT l
Docket No. 50-282 License No. DPR-42 Docket No. 50-306 License No. DPR-60 IE Bulletin No. 82-02 Attached is our report which provides the information requested by Action Item 3 of IE Bulletin 82-02: Degradation of Threaded Fasteners in the Reactor Coolant Pressure Boundary of PWR Plants.
I l
Yours truly l
_e C E Lar I
Director Nuclear Generation l
i CEL/ak I
cc: G Charnoff C D Feierabend Director, Office of Inspection and Enforcement Division of Reactor Operations Inspection Washington, DC 20555 8208100080 820802 MG 4 N PDR ADOCK 05000292 O
PDR W L//
/
s Att:chment
- R:gional Adminictr: tor - III, NRC August 2, 1982 The following report provides the information requested by Action Item 3 of IE Bulletin 82-02:
Degradation of Threaded Fasteners in the Reactor Coolant Pressure Boundary of PWR Plants.
Action Item 3a.
Identify those bolted closures of the RCP8 that have experienced leakage, particularly those locations where leakage occurred during the most recent plant operating cycle. Describe the inspections made and corrective measures taken to eliminate the problem.
If the leakage was attributed to gasket failure or its design, so indicate.
Response
Generally very few leakage problems have been experienced at Prairie Island.
Routine inspections of accessible reactor coolant pressure boundary components and other in containment systems are performed, at regular intervals, at power to identify any leakage locations or other problems.
These inspections provide early identification of leakage so corrective action can be planned and completed prior to leakage becoming excessive or causing bolted closure integrity concerns. Review of the maintenance records of the components which make up the reactor coolant pressure boundary has revealed four instances of bolted closure leakage.
1.
SI-9-1 " Loop B Cold Leg Injection Line Check Valve". The valve is a 6" bolted bonnet swing check valve. Leakage occurred at the body to bonnet joint. Corrective action perfonned was to seal weld the joint. All studs were replaced with new.
Occurrence date:
October, 1974.
2.
MV-32164 "RHR Suction from RCS Isolation Valve".
The valve is an 8" bolted bonnet motor operated gate valve. Leakage occurred at the body to bonnet joint. The joint was seal welded. The studs were cleaned and re-used. Date of occurrence:
April, 1977.
l 3.
Pressurizer Manway. Leakage occurred due to a gasket leak. The gasket was replaced. The studs were cleaned and re-used.
4.
SI-9-3 "RHR Injection to Reactor Vessel Check Valve". The valve is a 6" bolted bonnet swing check valve. Leakage occurred at the body to bonnet j o i n t., The gasket was replaced.
The studs were cleaned and re-used.
Date of occurrence:
September, 1981.
l Action Item 3b.
Identify those closures and ;onnections, if any, where fastener lubricants and injection sealant materials have been or are being used and report on l
plant experience with their application particularly any instances of SCC of fa steners.
Include types and composition of materials used.
s No injection sealant materials have been used on any reactor coolant pressure boundary bolted closures or connections at Prairie Island.
Review of plant maintenance records indicate the following fastener lubricants have or are bieng used at Prairie Island.
a.
Never-Seez Regular Grade Anti Seize and Lubricating Compound Manu facturer:
Bostik Chemical Group Broadview, Ill. 60153
==
Description:==
Copper and Graphite based paste lubricant.
b.
14eo-Lube Dry Film Conductive Lubricant Manufacturer:
Huron Industries Inc.
Port Huron, Michigan i
==
Description:==
Neo-lube #1 Colodial furnace graphite in alcohol Neo-lube #2 Graphite in isoproponol (MIL-L-24131B) c.
Holycote C-N Paste Lubricant Manufacturer:
Dow Corning Corporation Midland, Michigan Catalog No.:
88162
==
Description:==
Heavy duty lubricating paste containing a blend of molybdenura disulfide and white solid lubricants in mineral oil.
It also contains corrosion and oxidation inhibitors.
d.
Molycote Z Lubricant Powder Manu facturer:
Dow Corning Corporation Midland, Michigan Catalog No.:
88050
==
Description:==
The lubricant is a powder type pure form of molybdenum i
disulfide designed to meet (11L-N-7866A (ASG).
e.
Fel-Pro N 5000 Manufacturer:
Fel-Pro Incorporated Skokie, Illinois
==
Description:==
Lubricant is a nickel-graphite based anti-seize compound in a patte form.
f.
Fel-Pro N 1000*
Hanufacturer:
Fel-Pro Incorporated i
Skokie, Illinois l
==
Description:==
Lubricant is a copper-graphite based compound in a paste fo rm.
9 Fel-Pro C5-A* Hi-Temp Thread Compound Manu facturer:
Fel-Pro Incorporated Skokie, Illinois
==
Description:==
Lubricant is a copper-graphite based compound.
- No longer used at Prairie Island.
Review of current and past maintenance procedures and records provided the following reactor coolant pressure boundary bolted closures and connections wnere fastener lubricants have been used. i J
=
e Components (Material)
Lubricant Used Dates (if applicable)
Reactor Vessel Studs (SA-540 Gr. B-24)
Neolube Original - 5/74 Molycote G 5/74 - 11/76 Molycote Z 11/76 - 4/82 Fel-Pro N5000 4/82 - Present Reactor Coolant Pump Seal Housings Neolube only lubricant ever (ASME 193A Gr. B7) used Reactor Coolant Pump Main Flange Bolts Fel-Pro only lubricant ever (SA-540 Gr. B24 Class 4) used Steam Generator Primary Manways Fel-Pro Original - 1/77 (ASME 193A, Crade B7)
Never-Seez 1/77 - 7/81 Never-Seez or Fel-Pro N5000 7/81 - Present Pressurizer Manway (ASME 193A, Grade 87)
Fel-Pro Original - 1/77 Never-Seez 1/77 - 7/81 Never-Seez or Fel-Pro H5000 7/81 - Present Valves (ASME 193A, Gr. B7)
Fel-Pro or Never-Seez I
l. -.
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