Information Notice 1995-22, Hardened or Contaminated Lubricant Cause Metal-Clad Circuit Breaker Failures

Hardened or Contaminated Lubricant Cause Metal-Clad Circuit Breaker Failures

ML031060206
Person / Time
Site:	Beaver Valley, Millstone, Hatch, Monticello, Calvert Cliffs, Dresden, Davis Besse, Peach Bottom, Browns Ferry, Salem, Oconee, Mcguire, Nine Mile Point, Palisades, Palo Verde, Perry, Indian Point, Fermi, Kewaunee, Catawba, Harris, Wolf Creek, Saint Lucie, Point Beach, Oyster Creek, Watts Bar, Hope Creek, Grand Gulf, Cooper, Sequoyah, Byron, Pilgrim, Arkansas Nuclear, Three Mile Island, Braidwood, Susquehanna, Summer, Prairie Island, Columbia, Seabrook, Brunswick, Surry, Limerick, North Anna, Turkey Point, River Bend, Vermont Yankee, Crystal River, Haddam Neck, Ginna, Diablo Canyon, Callaway, Vogtle, Waterford, Duane Arnold, Farley, Robinson, Clinton, South Texas, San Onofre, Cook, Comanche Peak, Yankee Rowe, Maine Yankee, Quad Cities, Humboldt Bay, La Crosse, Big Rock Point, Rancho Seco, Zion, Midland, Bellefonte, Fort Calhoun, FitzPatrick, McGuire, LaSalle, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant
Issue date:	04/21/1995
From:	Grimes B K Office of Nuclear Reactor Regulation
To:
References
IN-95-022, NUDOCS 9504180073
Download: ML031060206 (13)

UNITED STATESNUCLEAR REGULATORY COMMISSIONOFFICE OF NUCLEAR REACTOR REGULATIONWASHINGTON, D.C. 20555April 21, 1995NRC INFORMATION NOTICE 95-22: HARDENED OR CONTAMINATED LUBRICANTS CAUSEMETAL-CLAD CIRCUIT BREAKER FAILURES

Addressees

All holders of operating licenses or construction permits for nuclear powerreactors.

Purpose

The U.S. Nuclear Regulatory Commission (NRC) is issuing this informationnotice to alert addressees to problems that could result from failing toperiodically check the condition of lubricants that may become hardened orcontain contaminants used in HK series (4-kV and 6.9-kV) and K-Line (600-V)circuit breakers manufactured by Asea Brown Boveri (ABB, formerly ITE) andDB-50 (480-V) breakers manufactured by Westinghouse. It is expected thatrecipients will review this information for applicability to their facilitiesand consider actions, as appropriate, to avoid similar problems. However,suggestions contained in this information notice are not NRC requirements;therefore, no specific action or written response is required.

Description of Circumstances

Hardened Grease in Breaker Operating MechanismsOn October 4, 1988, during surveillance testing of the low-pressure core spraypump at River Bend, Unit 1, the safety-related ABB HK 4-kV circuit breakerfailed to close after the closing circuit was energized from the control room.The failure was attributed to breaker linkage grease that had solidified withage, thus causing the closing mechanism to bind.On February 8, 1989, during post maintenance testing at D.C. Cook, Unit 1, anABB HK 4-kV breaker failed to close after the closing circuit was energized.On February 27, 1989, another HK breaker failed to close during a test. Bothfailures were attributed to hardened grease that caused the operatingmechanism to bind. Seven additional HK series breakers used in safety-relatedand balance-of-plant applications also failed in this manner. The breakerswere 17 years old and had been inspected and serviced several times. However,the revision of the vendor manual in use and, consequently, licenseeprocedures did not state the need to disassemble, clean or relubricate theoperating mechanism on a periodic basis, except when grease is found to be"contaminated" or when parts are replaced (see NRC Inspection Report50-315/89031 for additional information).RDiR :j4E JS en ce. SSOQ2S 95(YjS/9504180073dr<F0S At0 IN 95-22April 21, 1995 During an October 1992 surveillance test at LaSalle, Unit 1, an ABB HK 4-kYreactor recirculation pump breaker failed to trip. The failure was attributedto hardened grease in the operating mechanism. In October 1993, during a Unit2 refueling outage, a nonsafety-related ABB HK 4-kY pump breaker failed toclose. This failure also was attributed to hardened operating mechanismgrease. The licensee breaker maintenance procedures did not requireinspection (other than visual), disassembly, or relubrication of the breakeroperating mechanism on a periodic basis (see NRC Inspection Report 50-373/93031 for additional information).Contamination of Grease on Sliding Electrical PartsOn November 5, 1989, during surveillance testing at D.C. Cook, a WestinghouseDB-50 480-V "B" train reactor trip bypass breaker failed to close electricallybecause of high resistance in the auxiliary contacts that were part of theclosing circuit. The high resistance may have resulted from contamination ofthe conductive graphite grease prescribed by the vendor manual. The revisionof the Westinghouse instruction manual in use at D.C. Cook did not contain arecommendation for periodically replacing the graphite grease or checking itscondition (e.g., by measuring contact resistance). However, recent guidanceissued by the vendor provided for such checking and replacement, as required.DiscussionThe ABB HK breakers failed because lubricating grease solidified with age inthe breaker operating mechanisms. As the grease hardened, friction increasedin the metal-to-metal contact areas. The additional metal friction, as wellas some interference from hardened grease deposits, caused the mechanism tobecome increasingly difficult to operate freely, eventually resulting infailures of the breakers to open or close. The circuit breakers discussedabove had been routinely inspected on numerous occasions. However, while thelicensees adequately verified cleanliness in the visual inspections, theyfailed to identify lubricant that was solidified or contaminated. Preventivemaintenance activities did not include periodic cleaning or disassembly of theoperating mechanism to determine if the operating mechanism should berelubricated.Until 1991, all the revisions to the ITE/ABB HK and K-Line vendor manualsstated that breaker operating mechanisms were factory lubricated and shouldnot require additional lubrication during breaker service life. However, asearly as 1972, ABB manuals, such as ITE HK Switchgear Instruction BookIB-8.2.7-1, and medium-voltage switchgear maintenance and surveillance manualsMS 3.2.1.9-IB (for HK) and MS 3.1.1.9-2B (for K-Line), did call for cleaningand relubrication of the mechanism with ANDEROL 757 grease (or NO-OX-ID greasefor mating surfaces of moving, current-carrying joints) should any lubricantbe found contaminated or when parts are replaced.In response to a 1989 10 CFR Part 21 report from D.C. Cook of mechanismbinding due to hardened grease, ABB sent a letter to the NRC and all knownaffected licensees or purchasers of HK and K-Line breakers that described the K> ' IN 95-22April 21, 1995 problem and recommended solutions. LaSalle, for example, had received thisletter, yet had not updated procedures to prevent the 1992 and 1993 failures.Other plants with the affected breakers included Perry, Comanche Peak, andFermi. Comanche Peak had taken action to prevent these failures.In 1991, ABB issued revisions to the HK and K-Line manuals that called forperiodic (10-year) cleaning and relubrication of the operating mechanism withANDEROL 757 and the mating surfaces of moving, current-carrying joints withthe NO-OX-ID, although mechanical failures to operate have only beenattributed to hardened mechanism lubricant. In September 29 and October 3,1994, letters to the NRC, ABB stated, on the basis of recent refurbishments,that the condition of the mechanism lubricant cannot be determined withoutcomplete disassembly of the mechanism. The October letter also cited failuresof K3000 breakers as a result of hardened mechanism lubricant, but stated thatalthough failures of smaller K-Line breakers attributable to hardenedmechanism grease had not been reported, some had operated sluggishly. Repor-tedly, most of these breakers also have not been periodically disassembled,cleaned, or relubricated in service. In performing post maintenance testing,licensees found no evidence of impending breaker failures due to hardenedgrease because the tests were performed primarily to determine whether thebreaker tripped or closed.Unusual service conditions such as high ambient temperatures, very dirtyatmosphere during construction or outages or mixing of incompatible greaseswere not specifically identified in the instances cited. However, suchconditions accelerate hardening of mechanism lubricants and are conducive todirt or chemical contamination and increased electrical resistance ofelectrical part lubricants. Note that ESSO/Humble (now EXXON) NEBULA EP5Fgrease was used for these breakers prior to March 1972. After this date, newbreaker mechanisms were factory-lubricated with ANDEROL 757. Manufacturershave warned that old (or unidentified) grease should be completely removedbefore relubricating.Although referring to a different type of circuit breaker, NRC IN 93-26,"Grease Solidification Causes Molded-Case Circuit Breaker Failure to Close,"issued April 7, 1993, and its supplement issued January 31, 1994, described asimilar problem. In addition, addressees are reminded of commitments made inresponse to the staff position in Generic Letter 90-03 and its Supplement 1,to maintain contact with certain key vendors (which include Class IEswitchgear vendors), in order to ensure that manuals (and equipment) are keptup to date and the latest technical information (including 10 CFR Part 21reports and related correspondence) is promptly obtained, evaluated forapplicability, and acted on, as appropriate. Recommendations for switchgearmaintenance can also be found in owners group documents (e.g., theWestinghouse Owners Group guidelines on DB and DS breaker maintenance) andindustry guidance such as National Electrical Manufacturers Association (NEMA)publications, American National Standards Institute/Institute of Electricaland Electronic Engineers (ANSI/IEEE) standards, and various Electric PowerResearch Institute (EPRI) reports such as NP-7410, "Breaker Maintenance."

-'~' IN 95-22April 21, 1995 This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactone of the technical contacts listed below or the appropriate Office ofNuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Project SupportOffice of Nuclear Reactor RegulationTechnical contacts: Rogelio Mendez, RIII(708) 829-9745Stephen D. Alexander, NRR(301) 415-2995Sikhindra K. Mitra, NRR(301) 415-2783Tirupataiah Tella, RIII(708) 829-9749

Attachment:

List of Recently Issued NRC Information NoticesLe&la W

"AttachmentIN 95-22April 21, 1995 LIST OF RECENTLY ISSUEDNRC INFORMATION NOTICESInformation Date ofNotice No. Subject Issuance Issued to95-2194-64,Supp. 195-18,Supp. 195-2095-1995-18Unexpected Degradationof Lead Storage BatteriesReactivity InsertionTransient and AccidentLimits for High BurnupFuelPotential Pressure-Lockingof Safety-Related Power-Operated Gate ValvesFailures in RosemountPressure Transmittersdue to Hydrogen Per-meation into the SensorCellFailure of Reactor TripBreaker to Open Becauseof Cutoff Switch MaterialLodged in the Trip LatchMechanismPotential Pressure-Lockingof Safety-Related Power-Operated Gate ValvesReactor Vessel Top Guideand Core Plate CrackingVibration Caused byIncreased RecirculationFlow in a Boiling WaterReactorInadequate Logic Testingof Safety-Related Circuits04/20/9504/06/9503/31/9503/22/9503/22/9503/15/9503/10/9503/09/9503/07/95All holders of OLs or CPsfor nuclear power reactors.All holders of OLs or CPsfor nuclear power reactorsAll holders of OLs or CPsfor nuclear power reactors.All holders of OLs or CPsfor nuclear power reactors.All holders of OLs or CPsfor nuclear power reactors.All holders of OLs or CPsfor nuclear power reactors.All holders of OLs or CPsfor boiling water reactors.All holders of OLs or CPsfor boiling water reactors.All holders of OLs or CPsfor nuclear power reactors.95-1795-1695-15OL -Operating LicenseCP -Construction Permit I'~' IN 95-22April 21, 1995 This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactone of the technical contacts listed below or the appropriate Office ofNuclear Reactor Regulation (NRR) project manager.orig /s/'d by CIGrimesBrian K. Grimes, DirectorDivision of Project SupportOffice of Nuclear Reactor RegulationTechnical contacts:Rogelio Mendez, RIII(708) 829-9745Stephen D. Alexander, NRR(301) 415-2995Sikhindra K. Mitra, NRR(301) 415-2783Tirupataiah Tella, RIII(708) 829-9749

Attachment:

List of Recently Issued NRC Information Notices* See EGGreenman memorandum to RLDennig dated Juneand previous concurrence pages.DOCUMENT NAME: 95-22.IN----- at thL A....t I*.Alt. In tkhe bnx: 'C -CODY without enclosures "E"15, 1994-CoDy with enclosures ENS = No copyTO- ,-.IV[OFFICE Region III E Region III II E Region III ENAME TTella* RMendez* GGrant* EGGreenman*DATE 09/07/94 06/10/94 06/10/94 06/13/94OFFICE SIB/DOTS E TECH ED N SC:SIB DOTS E C:SIB/DOTS E E D:DOTS:NRRNAME SAlexander* BCalure* GCwalina* RGallo* RLSpessard*DATE 01/03/95 12/29/94 01/03/95 101/06/95 101/06/95OFFICE EELB/DE E C:EELB/DE ECB:DOPS C:ECB/DOPS L D-IDOPSI LNAME ISMitra* CBerlinger* RKiessel AChaffee BKGrimeV) IDATE 109/22/94 10/26/94 03/29/95 04/07/95 9OFFICIAL RECORD COPY IN 95-XXMarch 9, 1995 This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactone of the technical contacts listed below or the appropriate Office ofNuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Project SupportOffice of Nuclear Reactor RegulationTechnical contacts:Rogelio Mendez, Region III(708) 829-9745Stephen D. Alexander, NRR(301) 415-2995Sikhindra K. Mitra, NRR(301) 415-2783Tirupataiah Tella, Region III(708) 829-9749

Attachment:

List of Recently IssuedNRC Information Notices* See EGGreenman memorandum to RLDennig dated June 15, 1994and previous concurrence pages.DOCUMENT NAME: BKRGRSE.SDATo receive a conv of this document. Indicate In the box: 'C" -Coov without enclosures 'E' = Copy withenclosures 'N" -No coDyOFFICE Region III E Region III E Region III E Regibn III I ENAME TTella* RMendez* GGrant* EGGreenman*DATE 09/07/94 06/10/94 106/10/94 06/13/94OFFICE SIB/DOTS E TECH ED N SC:SIB/DOTS I E C:SIB/DOTS E ]D:DOTS:NRRl NNAME SAlexander* BCalure* GCwalina* IRGallo* RL pessard*DATE 01/03/95 12/29/94 101/03/95 101/06/95 101/06/95OFFICE EELB/DE E C:EELB/DE CB:DOPS ] C: ECUQP I D:DOPSlNAME SMitra* CBerlinger* RKiesel AChatff-W BKGrimesa-*DATE 09/22/94 l 10/26/94 03/ E 95 1/J& 03/ /95OFFICIAL RECORD COPY IN 95-XXJanuary 3, 1995 This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactone of the technical contacts listed below or the appropriate Office ofNuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Project SupportOffice of Nuclear Reactor RegulationTechnical contacts:Tirupataiah Tella, Region III(708) 829-9749Rogelio Mendez, Region III(708) 829-9745Sikhindra K. Mitra, NRR(301) 504-2783Stephen D. Alexander, NRR(301) 504-2995

Attachment:

List of Recently Issued NRC Information Notices* See EGGreenman memorandum to RLDennig dated Juneand previous concurrence pages.DOCUMENT NAME: BKRGRSE.SDA-- T -oa .&I .o xt-* l..At i., *ih. icy- ACEn CW withnoat Ancdloures 'F"15, 1994' CoDY with enclosures N -No copvo rU euvcive U cU Ps eB cge -Age. P --* -I-OFFICE Region III E Region III E Region III E Re ion III E ECB:DOPSNAME TTella* RMendez* GGrant* EGGreenman* RKieselDATE 09/07/94 06/10/94 06/10/94 06/13/94 01/ /95OFFICE SIB/DOTS E TECH ED DTN SC;§IRDOTS I Do:DOT§fIIRINAME SAlexander v BCalure* Gftf i a R sardDATE 101/5/95 12/29/94 01/3 /95 6 '01/t' 95OFFICE JEELB/DE I E C:EELB/DE l Jj/RR C:ECB/DOPS lI l D:NAME ISMitra CBerlinger BWSheron AChaffee BKGrimesDATE J01/ /95 01/ /95 01/ /95 01/ /95 01/ /95OFFICIAL RECORD COPY IN 94-XXDecember 28, 994This informati notice requires no specific action or written response. Ifyou have any que ions about the information in this notice, please contactone of the technica contacts listed below or the appropriate Office ofNuclear Reactor Regu tion (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contact(s): Tirupataiah Tell Region III(708) 829-9749Rogelio Mendez, Region II(708) 829-9745Sikhindra K. Mitra, NRR(301) 504-2703Stephen D. Alexander, NRR(301) 504-2995

Attachments:

1. List of Recently Issued NRC Information Notices* See EGGreenman memorandum to RLDennig dated June 15, 1994and previous concurrence pages.DOCUMFNT NAME! BKRGRSE.SDAT7 --Ih. M-U M this .kndoummAnt- kIdiintm In the hox: 'C -CoDv without enclosures WE'-Copy with enclosures END -No copyOFFICE Region III E [Recion III I E lRegion III I E Reio III E jNAME TTella* RMendez* IGGrant* EGGreenman*DATE 09/07/94 06/10/94 106/10/94 106/13/94OFFICE OGCB NRR E ED [ EELB/NRR E C:ECB/DOPS _DOPSNAME RKiesel* A , SMitra* CBerlinger* BKGrimesDATE 09/07/94 12/A0/94 09/22/94 10/26/94 12/ /94OFFICE D:DE/NRR E C:SIB/DOTS I D/DOTS I l C:ECB/DOPS D:DOPSNAME BWSheron* RGallo RLSpessard 1AChaffee BKGrimesDATE 11/01/94 12/ /94 12/ /94 112/ /94 12/ /94OFFICIAL RECORD COPY IN 94-XXDecember 28, 994This information notice requires no specific action or written response. Ifyou have any questions about the information in this notice, please contactone of the technical contacts listed below or the appropriate Office ofNuclear Reactor Regulation (NRR) project manager.Brian K. Grimes, DirectorDivision of Operating Reactor SupportOffice of Nuclear Reactor RegulationTechnical contact(s):Tirupataiah Tella, Region III(708) 829-9749Rogelio Mendez, Region III(708) 829-9745Sikhindra K. Mltra, NRR(301) 504-2703Stephen D. Alexander, NRR(301) 504-2995

Attachments:

1. List of Recently Issued NRC Information Notices* See EGGreenman memorandum to RLDennig dated Juneand previous concurrence pages. DOCUMENT NAME:As h .-4 dfj *A.-m'n Un thA hnV o C' -COnY without enclosures 'EW15, 1994NRCIN.471-CoDy with enclosures 'N' = No copyOFFICE *Region III *Region III *Region III *Region IIINAME TTella RMendez GEGrant EGGreenmanDATE 9/ 7/94 6/10/94 6/10/94 6/13/94OFFICE *OGCB/NRR *Tech Ed *EELB/NRR I*C:EELB/NRRNAME RJKiessel JMain JM SKMitra CHBerlingerDATE 9/ 7/94 9/12/94 9/22/94 10/26/94*D:DE/NRR C:RVIIB/NRR D:DOTS/NRR C:OECB/NRR D:DOPS/NRRBWSheron RGallo RLSpessard AEChaffee BKGrimes11/01/94 12/ /94 12/ /94 12/ /94 12/OFFICIAL RECORD COPY IN 94-xxOctober xx, 1994 In doing post maintenance testing, the licensees did not find evidence ofimpending breaker failures because the tests were done mainly to determinewhether the breaker tripped or closed.Related Generic CommunicationsAlthough involving a different type of circuit breaker, NRC IN 93-26, "GreaseSolidification Causes Molded-Ca'e Circuit Breaker Failure to Close," issuedApril 7, 1993, and its supplement ssued January 31, 1994, described a similarproblem with grease solidification.This information notice requires no spe fic action or written response. Ifyou have any questions about the informat n in this notice, please contactone of the technical contacts listed below the appropriate Office ofNuclear Reactor Regulation (NRR) project mana r.Brian K. Grim , DirectorDivision of Ope0ating Reactor SupportOffice of Nuclea Reactor RegulationTechnical contact(s): Tirupataiah Tella, Region III(708) 829-9749Rogelio Mendez, Region III(708) 829-9745Sikhindra K. Mitra, NRR(301) 504-2703

Attachments:

1. List of Recently Issued NRC Information Notices* see EGGreenman memorandum to RLDennig dated June 15, 1994and Drevious concurrence pagesIOFFICE *Region III *Region III *Region III *Region IIINAME TTella RMendez GEGrant EGGreenmanDATE 9/ 7/94 6/10/94 6/10/94 6/13/94OFFICE *OGCB/NRR *Tech Ed *EELB/NRR *C:EELB/NRRNAME RJKiessel JMain JM SKMitra CHBerlingerDATE 9/ 7/94 9/12/94 9/22/94 10/26/94*D:DE/NRR C:RVIB/NRR D:DOTS/NRR C:OECB/NRR D:DOPS/NRRBWSheron RGalloj RLSpessard AEChaffee BKGrimes11/01/94 11/ /94 11/ /94 11/ /94 11/ /94DOCUMENT NAME: NRCIN.471 I.IN 94-xxOctober xx, 1994 In doing post maintenance testing, the licensees did not find evidence ofimpending breaker failures because the tests were done mainly to determinewhether the breaker trfpped or closed.Related Generic Communica'tionsAlthough involving a different type of circuit breaker, NRC IN 93-26, *GreaseSolidification Causes Molded-Ca Circuit Breaker Failure to Close," issuedApril 7, 1993, and its supplement issued January 31, 1994, described a similarproblem with grease solidification.This information notice requires no s cific action or written response. Ifyou have any questions about the informa ion In this notice, please contactone of the technical contacts listed belo or the appropriate Office ofNuclear Reactor Regulation (NRR) project ma ager.Brian K. G mes, DirectorDivision of erating Reactor SupportOffice of Nuc ar Reactor RegulationTechnical contact(s): Tirupataiah Tella, Region III(708) 829-9749Rogelio Mendez, Region III(708) 829-9745Sikhindra K. Mitra, NRR(301) 504-2703

Attachments:

1. List of Recently Issued NRC Information Notices* see EGGreenman memorandum to RLDennig dated June 15, 1994and previous concurrence pagesa_ _ _ _ _ _ _ L _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _OFFICE *Region III *Region III *Region III *Region IIINAME TTella IRMendez GEGrant EGGreenmanDATE 9/ 7/94 6/10/94 6/10/94 6/13/94OFFICE *OGCB/NRR *Tech Ed *EELB/NRR C gerLNAME RJKiessel JMain JM SKMitra CH e ngerDATE 9/ 7/94 l 9/12/94 9/22/94 10 /94OFFICE p:E/NR C:OECB/NRR l D:DOPS/NRRNAME 7B iheron AEChaffee BKGrimesDATE L/ I L/94 10/ /94 10/ /94DOCUMENT NAME: NR5Ir\.471 IN 94-xxSeptember xx, 1994 In doing post ma tenance testing, the icensees did not find evidence ofimpending breaker ilures because the were done mainly to determine whetherthe breaker tripped closed. SW,This information notice quires no specific action or written response. Ifyou have any questions abo the information in this notice, please contactone of the technical contact listed below or the appropriate Office ofNuclear Reactor Regulation (NR project manager.1an K. Grimes, Directortvision of Operating Reactor Supporttkce of Nuclear Reactor RegulationTechnical contact(s):Tirupataiah Tella, Rgion III(708) 829-9749 \Rogelio Mendez, Region Ilk(708) 829-9745 \Sikhindra K. Mitra, NRR(301) 504-2703

Attachments:

1. List of Recently Issued NRC Information Notices* see EGGreenman memorandum to RLDennigand Drevious concurrence nBaandated June 15, 1994OFFICE J

• II *Region III *Region III *Region IIINAME TTella RMendez GEGrant EGGreenman IDATE I 9/ 7/94 6/10/94 6/10/94 1 6/13/94 .= I I__OFFICE*OGCB/NRR*Tarh Fklcro i nonnDr_ .err n. Al-n0I I. L.LL.U/ I CLDt% l LLLVIflKKDit21kihf i ________________NAMERJKlesselJMalin OMqrIMi t"M ML&ruD^-1 ----_AME RI esse_ _n JM,- -- uVrMI ILngeDATE 9/ 7/94 9/12/94 9/2_t194 9/ /94OFFICE D:DE/NRR C:OGCB/NRR [ D:DORS/NRRNAME BWSheron ELDoolittle BKGrimes _DATE I 9/ /94 9/ /94 I_9_ _ 94_ _)FOCUMFNT M AMFP N JDJrT A7111.-. , w -8u .III%% AM .'T 1 1