ML20062E622
| ML20062E622 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 07/30/1982 |
| From: | Hering R INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| REF-SSINS-6820 AEP:NRC:0703, IEB-82-02, NUDOCS 8208100175 | |
| Download: ML20062E622 (7) | |
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lNDIANA & MICHIGAN ELECTRIC COMPANY P. O. 80 X 18 BOWLING GR EEN ST ATION NEW YORK, N. Y.10004 July 30, 1982 AEP:NRC:0703 Donald C. Cook Nuclear Plant Unit Nos. 1 and 2 Docket Nos. 50-315 and 50-316 License Nos. DPR-58 and DPR-74 IE BULLETIN 82-02 DEGRADATION OF THREADED FASTENERS IN THE RCPB Mr. James G. Keppler, Regional Administrator U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137
Dear Mr. Keppler:
This letter and its Attachment respond to item 3 of NRC IE Bulletin No. 82-02, which requested information on the leakage of bolted closures in the Reactor Coolant Pressure Boundary. The data covet the period of time starting in January,1981 through July 1982. Pages 1 and 2 of the Attachment list the instances ot' leakages and the corrective actions taken in Unit Nos.1 and 2 of the Cook Plant, respectively.
In reference to Item 3(b) regarding the use of sealant materials, Furmanite sealant was used on two occasions to seal leaks on valves NMO-151 and NM0-152 of Unit No. 1.
These valves are pressurizer PORV block valves, and are 3 inch in size.
Valve NM0-151 had a bonnet leak and valve NMO-152 had a valve stem packing leak. Although these two valves are less than 6.0 inches in size, we have included them in the table for information only. In both cases Furmanite sealant was applied during November 1981 and was removed in January 1982 when the valves were repaired using a new gasket and a new packing. These two block valves are above the steam bubble area in the Pressurizer and thus do not normally come into contact with 8208100175 820730 PDR ADOCK 050003gg ggg 4 gg7 Wb /
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4 primary coolant during plant operation. During the January 1982 repair, the body / bonnet bolts were not replaced since no indication of erosion or corrosion was identified. The body / bonnet bolts on this valve c:e of Chrome-Moly B7 material.
Very truly yours,
/1?lf:
R. F. Hering
/os Vice President cc: John E. Dolan - Columbus R. S. Hunter L.
P. Alexich R. W. Jurgensen W. G. Smith, Jr. - Bridgman R. C. Callen G. Charnoff Joe Williams, Jr.
NRC Resident Inspector at Cook Plant - Bridgman
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STATE OF NEW YORK )
COUNTY OF NEW YORK)
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R. F. Hering, being duly sworn, deposes and says that he is the Vice President of Licensee' Indiana & Michigan Electric Company, that he has read the foregoing response to item 3 of the NRC Bulletin 82-02,
" Degradation of Threaded Fasteners in Reactor Coolant Pressure Boundary" and knows the contents thereof;' and that said contents are true to the best of his knowledge and belief.,
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s R. F. Hering
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Subscribed and sworn to before me this Jo* day of =C4, 19 2_2.-
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DONALD C. COOK NUCLEAR Pl. ANT - UNIT NO. I ATTAC!! MENT TO AEP:NRC:0703 BOLTED Cf.0SURE INSPECTION TYPE OF CORRECTIVE I.UBRICANTS INJECTION LEAKAGE Fall.UR E ACTION llSED SEALANT C0f!?!ENTS (1)
(2)
REPLACED FEl. PRO (4)
Si-158-1.1 VISUAL GASKET GASKET (3)
N-1000 NA J.O. 80749, Il-7-81 6"
CilECK VALVE SI-158-1.2 VISUAL. '
GASKET (
'k3)
_g0 0 NA J.O. 80749, 11-7-81 6"
CllECK VAINE "
k3)
SI-158-I'3 VISUAI*
CASKET CASKFT N-1000 (4)
NA J.O. 80749, 11-7-81 6"
CilECK VALVE St-158-L4 VI SUAI.(
CASKET
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CASKET N-1000 (4)
NA J.O. 80749, Il-7-81 6"
CllECK VAINE (1)
(2)
REPLACED RIl-134 VISUAL CASKFT CASKET (3)
FEl. PRO REPLACEMENT STUDS WERE B-7 flATERIAl.
REPI. ACED N-1000 (4)
NA STUDS (5)
J.O.
71738, Il-7-81 8"
CilECK VAINE (7)
(1)
(2)
NMO-151 VISUAL GASKET FURMANITED NA FURMANITE i
(6)
SEALANT (6)
J.O. 80752, 11-12-81 3"
MOTOR OPERATED CATE VAINE
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VISUAL ('
WMO-152 STEN FURMANITED NA FURMANITE PACKING SEALANT J.O. 80768, 11-18-81, 3"
MOTOR OPERATED CATE VAINE.
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DONALD C. COOK NUCLEAR PLANT - UNIT NO. 2 ATTACllMENT TO AEP:NRC:0703 BOLTED CLOSURE TYPE OF CORRECTIVE LUBRICANTS INJECTION LEAKAGE INSPECTION FAILURE ACTION USED SEALANT CottMENTS (1)
(2)
REPLACED FEL PRO SI-170-L3 VISUAL CASKET GASKET (3)
(4)
N-1000 NA J.O. 23419 3-25-82 (1)
~(27 REPLACED FEL PRO
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10" CilECK VALVE
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SI-161-L4 VISUAL GASKET
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STM. GEN. ~
GASKET (3)
N-1000 J.O. 22837 4-29-81 6" CllECK VALVE (1)
(2)
REPLACED FEL PRO REPLACED TWO (2) CLOSURE fiOLTS TIIAT WERE IlOT LEG VISUAL GASKET MANWAY U.T.
(8)
STEAM CUT.
CASKET (3)
N-5000 NA J.O. 27543 4-8-82 IlOTLEG MANWAY COVER (1)
(2)
REPLACED (3:
FEL PRO PZR-MANWAY VISUAL GASKET GASKET AND N-1000 NA MT (9) 2 STUDS J.O. 29022 10-24-81 PRESSURIZER MANWAY
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DONALD C. COOK NUCLEAR PLANT ATTACHMENT TO AEP:NRC:0703 INDEX OF NOTES 1)
A visual inspection of the Reactor Coolant Pressure Boundary is made at the beginning of every outage while there is still pressure on the system.
If an indication of leakage is noted, insulation is removed, the source of the leakage is noted, and a job order is written to repair the leak.
During repairs, there are inspection " Hold Points" that call for visual inspections to be made by the Maintenance Supervisor and Chemical Section. The Maintenance Supervisor checks for proper assembly and the Chemical Section assures that no foreign materials have entered the system and that cleanliness has been maintained during the repairs. Their signatures are required before work can continue.
A Containment leak inspection is made prior to criticality.
2)
Flexitallic spiral-wound gasket 3)
New gaskets are installed whenever a bonnet or manway cover is removed. After gaskets are replaced and the bonnet or manway repositioned, a specific bolting sequence is followed that applies to that particular closure.
4)
Fel Pro N-1000 and Neolube were the lubricants used on closure studs until we were advised by a Westinghouse bulletin (NSD Data Letter DL-82-01, dated January 22, 1982) that Fel Pro N-1000 no longer be used. The Plant has since banned the use of Fel Pro N-1000 and made Fel Pro N-5000 a new approved lubricant for safety related systems.
5) 16 studs 1 3/8" x 9" M&E #30-029925 were installed.
(B-7 material) 6)
A body to bonnet leak was noted on NMO-151 during hot stand-by prior to reactor criticality'.
Furmanite Corp. was called in to seal the leak. The injection sealant was successful in stopping the leak.
Furmanite sealant composition is proprietary information, but is approved for use on nuclear systems.
7)
Typically, during the next outage af ter a valve has been furmanited, the valve is repaired.
The Furmanite sealant is removed and the leak is repaired by installing a new gasket / packing.
_4 8)
All manway bolts were U.T'd and found acceptable. Two closure bolts were steam cut due to the leaking gasket---both bolts were replaced.
9)
The pressurizer manway cover adjacent to the gasket seating surf ace was steam cut and the incications were ground out and Magnetic Particle tested.
The NDE was acceptable.
Two studs were steam cut and replaced.
The gasket was the cause of leakage and only minute traces of boron were found at the manway.
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