ML20062G423
| ML20062G423 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/03/1982 |
| From: | Hukill H GENERAL PUBLIC UTILITIES CORP. |
| To: | Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| REF-SSINS-6820 5211-82-182, IEB-82-02, IEB-82-2, NUDOCS 8208130013 | |
| Download: ML20062G423 (5) | |
Text
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s GPU Nuclear U
M d e own Pennsylvania 17057 717-944-7621 Writer's Direct Dial Number:
August 3,1982 5211-82-182 Mr. R. C. Haynes Region I, Regional Administrator U. S. Nucicar Regulatory Commission 631 Park Avenue King of Prussia, PA 19406
Dear Sir:
Threa !!ile Island Nuclear Station, Unit 1 (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 IE Bulletin 82-02 In accordance with IE Bulletin 82-02, this letter transmits our response to items 3 and 5 of the subject bulletin.
Item 1, 2 and 4 will also be reported in accordance with the instructions of the. subject bulletin.
Attachment A identifies those bolted closures of the Reactor Coolant Pressure Boundary (RCPB) tiwt have experienced leakage with the resultant inspections made and corrective measures taken to eliminate the leakage. This attachment responds to Item 3.a of the subject bulletin with the exception of DH-V1.
Attachment B identifies the RCPB closures and connections where fastener lubricants have been or are being used and the lubricant's composition.
Our experience with these lubricants has been satisfactory. This attach-ment responds to part of item 3.b of the subject bulletin.
Attachment C describes the only RCPB closure where injection sealant material has been used (DH-V1) and the sealant's composition. Our experience has been satisfactory with the sealant materials which we have used. This attachment completes our response to items 3.a and 3.b of the subject bulletin.
Sincerely,
\\-
H. D.
I kill Director, TMI-l HDH:CJS:vj f Attachments cc:
R. Conte Sworn and Subscribed to before me this 3rd day of Auguet
, 1982.
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ATTACHMENT A Page 1 of 2 Bolted Closures of The RCPB at TMI-1 That have Experienced Leakage
- Closure Approx.
Mode of Inspections Made to Date of Failure Eliminate' Leakage Corrective Measures Taken Repair "B" Steam 3/79 Gasket Fail-Visual inspection of gasket Replaced corroded stud with a oversize stud, Generator Lower ure seating surface, gasket back-(threads were damaged when an attempt was made Primary Hand" ing plate and handhole cover.
to remove the wasted stud) verified correct hole replacement Flexicallic gasket and retorqued handhole cover. Visual inspection of handhole at 2285 psig leak test pressure during Hot Functional Testing (July, 1981) showed no evidence of leakage.
"A" Steam 3/79 Slight leak-Visual inspection of gasket Yarified correct replacement Flexitallic Cenarator Lower age observed, seating surface, backing plate gasket and retorqued handhole.
Primary Hand-no obvious.
and headhole cover.
hole failure mode 10/80 Same as Visual inspection of gasket Verified correct replacement Flexitallic above seating surface, backing plate gasket and retorqued handhole. Visual inspection and handhole cover.
of the handhole at leak test pressure at 2285 psig during Hot Functional Testing (July 1981) showed no evidence of leakage.
"A" Steam 8/80 Same as Visual inspection of gasket Verified correct replacement Flexitallic Generator Lower above seating surf ace, gasket back-gasket and retorqued manway. Visual inspection Primary Manway ing plate and man way cover, at leak test pressure of 2285 psig showed no evidence of leakage during Hot Functional Testing (July 1981).
7/81 Slight leak-Manway cover, gasket seating To be determined based upon dimensional age observed, surface and backing cover flat-~cvaluation of the closure, no obvious ness checks and dimension failure mode.
tolerance checks in process Leakage stop-of being taken and evaluated, ped at >500 psig.
I
t ATTAQIMENT A Page 2 of 2 Bolted Closures of The RCPB at TMI-l That Have Experienced Leakage closure Approx.
Mode of Inspections Made to Date of Failure Eliminate Leakage Corrective Measures Taken Repair CRD No. 68 4/82 Slight leak-Visual inspection of gasket Replaced flexitallic gaskets, studs and Nozzle Flangej, age observed, seating surfaces, bolting segments and retorqued closure.
1 to Reactor' no obvious Vessel' failure mode.
ATTACRMENT B Page 1 of 1 RCPS FASTENER LUBRICANTS Closure Lubricant Composition of Lubricant Steam Generator Molykote C-Rapid Molybdenum disulfide and other solid lubricants Primary Manway &
Spray in a special grade mineral oil.
Inspection Openings Pressurizer Man-Molykote C Molybdenum disulfide and white solid lubricants way Cover in a mineral oil.
CRDM Reactor Molykote C Same as above.
Vessel Nozzle Flange RC Relief Valves Never-Seez Compound Finely divided metallic particles in a special hydrocarbon carricr.
Fel-Pro N-1000 Copper and graphite Flakes in a petroleum carrier.
RC Pump Main Fel-Pro N-1000 Same as above.
Flange Bolts RC Pump Lower Neolube liigh grade graphite particles in thermoplastic Seal llousing resin and isopropanal.
Cap Screws I
L
ATTACHMENT C DH-V1 letdown (first isolation valve from the hot leg of the Reactor, Coolant "B". Loop) has experienced pressure seal ring leakage. DH-V1 is a 12 inch, type 316 stainless steel pressure-seated gate valve manufactured by the Walworth Company. Following stem replacement during Spring 1976 Refueling :
Outage, DH-V1 developed a leak (0.2-0.5 gpm) past the pressure seal ring
~
gasket as evidenced:by-leakage up through the threads between the retaining ring and the valve. body. _During' November 1976 nuclear grade Furmanite was injected and successfully stopped the leakage. The Furmanite compound has a Nitrile rubber base. Testing of the nuclear grade _ compound was performed and the following levels were-determined:
Total Leachable Sodium 0.175 mg/gm 0.080 mg/gm Chloride J '. 39 mg/gm-0.008 mg/gm Lead 0.022 mg/gm 0.005 ug/gm Zinc
.114.37 mg/gm.
_0.053 mg/gm.
Fluoride
<l.7 ug/gm-
<l.7 ug/gm Sulfur-
<.01%
<.01%
Since the initial injection, there has been an additionalinjection of Furmanite (October,1981) using a compound with lesser contaminent levels than used in -
1976. The analysis of the second injection of Furmanite was:
Total Leachable-Chlorine
'38 26-Flourine 11
<1 Sulfur (As S) 14
<2 Antimony 70.03 7_0.03 Arsenic Cadmium
<0.03-I.ead 70.3 Tin 73 Zinc 70.05 Mercury 0.002-NOTE: Results in microgram / gram i
I
- Not Measured A
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I
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