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 Office of Nuclear Reactor Regulation
To:
References
IN-95-022, NUDOCS 9504180073
Download: ML031060206 (13)

UNITED STATES

NUCLEAR REGULATORY COMMISSION

OFFICE OF NUCLEAR REACTOR REGULATION

WASHINGTON, D.C. 20555 April 21, 1995 NRC INFORMATION NOTICE 95-22: HARDENED OR CONTAMINATED LUBRICANTS CAUSE

METAL-CLAD CIRCUIT BREAKER FAILURES

Addressees

All holders of operating licenses or construction permits for nuclear power

reactors.

Purpose

The U.S. Nuclear Regulatory Commission (NRC) is issuing this information

notice to alert addressees to problems that could result from failing to

periodically check the condition of lubricants that may become hardened or

contain 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) and

DB-50 (480-V) breakers manufactured by Westinghouse. It is expected that

recipients will review this information for applicability to their facilities

and 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 Mechanisms

On October 4, 1988, during surveillance testing of the low-pressure core spray

pump at River Bend, Unit 1, the safety-related ABB HK 4-kV circuit breaker

failed to close after the closing circuit was energized from the control room.

The failure was attributed to breaker linkage grease that had solidified with

age, thus causing the closing mechanism to bind.

On February 8, 1989, during post maintenance testing at D.C. Cook, Unit 1, an

ABB 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. Both

failures were attributed to hardened grease that caused the operating

mechanism to bind. Seven additional HK series breakers used in safety-related

and balance-of-plant applications also failed in this manner. The breakers

were 17 years old and had been inspected and serviced several times. However, the revision of the vendor manual in use and, consequently, licensee

procedures did not state the need to disassemble, clean or relubricate the

operating mechanism on a periodic basis, except when grease is found to be

"contaminated" or when parts are replaced (see NRC Inspection Report

50-315/89031 for additional information).

RDiR :j4E JS en ce. SSOQ2S 95(YjS/

9504180073 dr<F0S At0

IN 95-22 April 21, 1995 During an October 1992 surveillance test at LaSalle, Unit 1, an ABB HK 4-kY

reactor recirculation pump breaker failed to trip. The failure was attributed

to hardened grease in the operating mechanism. In October 1993, during a Unit

2 refueling outage, a nonsafety-related ABB HK 4-kY pump breaker failed to

close. This failure also was attributed to hardened operating mechanism

grease. The licensee breaker maintenance procedures did not require

inspection (other than visual), disassembly, or relubrication of the breaker

operating mechanism on a periodic basis (see NRC Inspection Report 50-373/

93031 for additional information).

Contamination of Grease on Sliding Electrical Parts

On November 5, 1989, during surveillance testing at D.C. Cook, a Westinghouse

DB-50 480-V "B" train reactor trip bypass breaker failed to close electrically

because of high resistance in the auxiliary contacts that were part of the

closing circuit. The high resistance may have resulted from contamination of

the conductive graphite grease prescribed by the vendor manual. The revision

of the Westinghouse instruction manual in use at D.C. Cook did not contain a

recommendation for periodically replacing the graphite grease or checking its

condition (e.g., by measuring contact resistance). However, recent guidance

issued by the vendor provided for such checking and replacement, as required.

Discussion

The ABB HK breakers failed because lubricating grease solidified with age in

the breaker operating mechanisms. As the grease hardened, friction increased

in the metal-to-metal contact areas. The additional metal friction, as well

as some interference from hardened grease deposits, caused the mechanism to

become increasingly difficult to operate freely, eventually resulting in

failures of the breakers to open or close. The circuit breakers discussed

above had been routinely inspected on numerous occasions. However, while the

licensees adequately verified cleanliness in the visual inspections, they

failed to identify lubricant that was solidified or contaminated. Preventive

maintenance activities did not include periodic cleaning or disassembly of the

operating mechanism to determine if the operating mechanism should be

relubricated.

Until 1991, all the revisions to the ITE/ABB HK and K-Line vendor manuals

stated that breaker operating mechanisms were factory lubricated and should

not require additional lubrication during breaker service life. However, as

early as 1972, ABB manuals, such as ITE HK Switchgear Instruction Book

IB-8.2.7-1, and medium-voltage switchgear maintenance and surveillance manuals

MS 3.2.1.9-IB (for HK) and MS 3.1.1.9-2B (for K-Line), did call for cleaning

and relubrication of the mechanism with ANDEROL 757 grease (or NO-OX-ID grease

for mating surfaces of moving, current-carrying joints) should any lubricant

be found contaminated or when parts are replaced.

In response to a 1989 10 CFR Part 21 report from D.C. Cook of mechanism

binding due to hardened grease, ABB sent a letter to the NRC and all known

affected licensees or purchasers of HK and K-Line breakers that described the

'

K> IN 95-22 April 21, 1995 problem and recommended solutions. LaSalle, for example, had received this

letter, yet had not updated procedures to prevent the 1992 and 1993 failures.

Other plants with the affected breakers included Perry, Comanche Peak, and

Fermi. Comanche Peak had taken action to prevent these failures.

In 1991, ABB issued revisions to the HK and K-Line manuals that called for

periodic (10-year) cleaning and relubrication of the operating mechanism with

ANDEROL 757 and the mating surfaces of moving, current-carrying joints with

the NO-OX-ID, although mechanical failures to operate have only been

attributed 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 without

complete disassembly of the mechanism. The October letter also cited failures

of K3000 breakers as a result of hardened mechanism lubricant, but stated that

although failures of smaller K-Line breakers attributable to hardened

mechanism 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 hardened

grease because the tests were performed primarily to determine whether the

breaker tripped or closed.

Unusual service conditions such as high ambient temperatures, very dirty

atmosphere during construction or outages or mixing of incompatible greases

were not specifically identified in the instances cited. However, such

conditions accelerate hardening of mechanism lubricants and are conducive to

dirt or chemical contamination and increased electrical resistance of

electrical part lubricants. Note that ESSO/Humble (now EXXON) NEBULA EP5F

grease was used for these breakers prior to March 1972. After this date, new

breaker mechanisms were factory-lubricated with ANDEROL 757. Manufacturers

have warned that old (or unidentified) grease should be completely removed

before 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 a

similar problem. In addition, addressees are reminded of commitments made in

response to the staff position in Generic Letter 90-03 and its Supplement 1, to maintain contact with certain key vendors (which include Class IE

switchgear vendors), in order to ensure that manuals (and equipment) are kept

up to date and the latest technical information (including 10 CFR Part 21 reports and related correspondence) is promptly obtained, evaluated for

applicability, and acted on, as appropriate. Recommendations for switchgear

maintenance can also be found in owners group documents (e.g., the

Westinghouse Owners Group guidelines on DB and DS breaker maintenance) and

industry guidance such as National Electrical Manufacturers Association (NEMA)

publications, American National Standards Institute/Institute of Electrical

and Electronic Engineers (ANSI/IEEE) standards, and various Electric Power

Research Institute (EPRI) reports such as NP-7410, "Breaker Maintenance."

-'~' IN 95-22 April 21, 1995 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) project manager.

Brian K. Grimes, Director

Division of Project Support

Office of Nuclear Reactor Regulation

Technical contacts: Rogelio Mendez, RIII

(708) 829-9745 Stephen D. Alexander, NRR

(301) 415-2995 Sikhindra K. Mitra, NRR

(301) 415-2783 Tirupataiah Tella, RIII

(708) 829-9749 Attachment:

List of Recently Issued NRC Information Notices

Le&la ŽW

"Attachment

IN 95-22 April 21, 1995 LIST OF RECENTLY ISSUED

NRC INFORMATION NOTICES

Information Date of

Notice No. Subject Issuance Issued to

95-21 Unexpected Degradation 04/20/95 All holders of OLs or CPs

of Lead Storage Batteries for nuclear power reactors.

94-64, Reactivity Insertion 04/06/95 All holders of OLs or CPs

Supp. 1 Transient and Accident for nuclear power reactors

Limits for High Burnup

Fuel

95-18, Potential Pressure-Locking 03/31/95 All holders of OLs or CPs

Supp. 1 of Safety-Related Power- for nuclear power reactors.

Operated Gate Valves

95-20 Failures in Rosemount 03/22/95 All holders of OLs or CPs

Pressure Transmitters for nuclear power reactors.

due to Hydrogen Per- meation into the Sensor

Cell

95-19 Failure of Reactor Trip 03/22/95 All holders of OLs or CPs

Breaker to Open Because for nuclear power reactors.

of Cutoff Switch Material

Lodged in the Trip Latch

Mechanism

95-18 Potential Pressure-Locking 03/15/95 All holders of OLs or CPs

of Safety-Related Power- for nuclear power reactors.

Operated Gate Valves

95-17 Reactor Vessel Top Guide 03/10/95 All holders of OLs or CPs

and Core Plate Cracking for boiling water reactors.

95-16 Vibration Caused by 03/09/95 All holders of OLs or CPs

Increased Recirculation for boiling water reactors.

Flow in a Boiling Water

Reactor

95-15 Inadequate Logic Testing 03/07/95 All holders of OLs or CPs

of Safety-Related Circuits for nuclear power reactors.

OL - Operating License

CP - Construction Permit

I

'~' IN 95-22 April 21, 1995 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) project manager.

orig /s/'d by CIGrimes

Brian K. Grimes, Director

Division of Project Support

Office of Nuclear Reactor Regulation

Technical contacts: Rogelio Mendez, RIII

(708) 829-9745 Stephen D. Alexander, NRR

(301) 415-2995 Sikhindra K. Mitra, NRR

(301) 415-2783 Tirupataiah Tella, RIII

(708) 829-9749 Attachment:

List of Recently Issued NRC Information Notices

• See EGGreenman memorandum to RLDennig dated June 15, 1994 and previous concurrence pages.

DOCUMENT NAME: 95-22.IN

TO- ,-.IV - ---- at thL A....t I*.Alt. In tkhe bnx: 'C -CODY without enclosures "E" - CoDy with enclosures ENS = No copy

[OFFICE Region III E Region III II E Region III E

NAME TTella* RMendez* GGrant* EGGreenman*

DATE 09/07/94 06/10/94 06/10/94 06/13/94 OFFICE SIB/DOTS E TECH ED N SC:SIB DOTS E C:SIB/DOTS EE D:DOTS:NRR

NAME SAlexander* BCalure* GCwalina* RGallo* RLSpessard*

DATE 01/03/95 12/29/94 01/03/95 101/06/95 101/06/95 OFFICE EELB/DE E C:EELB/DE ECB:DOPS C:ECB/DOPS LD-IDOPSI L

NAME ISMitra* CBerlinger* RKiessel AChaffee BKGrimeV) I

DATE 109/22/94 10/26/94 03/29/95 04/07/95 9 OFFICIAL RECORD COPY

IN 95-XX

March 9, 1995 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) project manager.

Brian K. Grimes, Director

Division of Project Support

Office of Nuclear Reactor Regulation

Technical contacts: Rogelio Mendez, Region III

(708) 829-9745 Stephen D. Alexander, NRR

(301) 415-2995 Sikhindra K. Mitra, NRR

(301) 415-2783 Tirupataiah Tella, Region III

(708) 829-9749 Attachment:

List of Recently Issued NRC Information Notices

• See EGGreenman memorandum to RLDennig dated June 15, 1994 and previous concurrence pages.

DOCUMENT NAME: BKRGRSE.SDA

To receive a conv of this document. Indicate In the box: 'C" - Coov without enclosures 'E' = Copy with enclosures 'N" - No coDy

OFFICE Region III E Region III E Region III E Regibn III I E

NAME TTella* RMendez* GGrant* EGGreenman*

DATE 09/07/94 06/10/94 106/10/94 06/13/94 OFFICE SIB/DOTS E TECH ED N SC:SIB/DOTS I E C:SIB/DOTS E ]D:DOTS:NRRl N

NAME SAlexander* BCalure* GCwalina* IRGallo* RL pessard*

DATE 01/03/95 12/29/94 101/03/95 101/06/95 101/06/95 OFFICE EELB/DE E C:EELB/DE CB:DOPS ]C: ECUQP ID:DOPSl

NAME SMitra* CBerlinger* RKiesel AChatff-W BKGrimesa-

• DATE 09/22/94 l 10/26/94 03/ 95 E 1/J&

03/ /95 OFFICIAL RECORD COPY

IN 95-XX

January 3, 1995 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) project manager.

Brian K. Grimes, Director

Division of Project Support

Office of Nuclear Reactor Regulation

Technical contacts: Tirupataiah Tella, Region III

(708) 829-9749 Rogelio Mendez, Region III

(708) 829-9745 Sikhindra K. Mitra, NRR

(301) 504-2783 Stephen D. Alexander, NRR

(301) 504-2995 Attachment:

List of Recently Issued NRC Information Notices

• See EGGreenman memorandum to RLDennig dated June 15, 1994 and previous concurrence pages.

DOCUMENT NAME: BKRGRSE.SDA

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OFFICE Region III E Region III E Region III E Re ion III E ECB:DOPS

NAME TTella* RMendez* GGrant* EGGreenman* RKiesel

DATE 09/07/94 06/10/94 06/10/94 06/13/94 01/ /95 OFFICE SIB/DOTS E TECH ED SC;§IRDOTS DTN I Do:DOT§fIIRI

NAME SAlexander v BCalure* Gftfi a R sard

DATE 101/5/95 12/29/94 01/3 /95 6 '01/t' 95 OFFICE JEELB/DE I E C:EELB/DE l Jj/RR C:ECB/DOPS lI l D:

NAME ISMitra CBerlinger BWSheron AChaffee BKGrimes

DATE J01/ /95 01/ /95 01/ /95 01/ /95 01/ /95 OFFICIAL RECORD COPY

IN 94-XX

December 28, 1994 This informati notice requires no specific action or written response. If

you have any que ions about the information in this notice, please contact

one of the technica contacts listed below or the appropriate Office of

Nuclear Reactor Regu tion (NRR) project manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contact(s): Tirupataiah Tell Region III

(708) 829-9749 Rogelio Mendez, Region II

(708) 829-9745 Sikhindra K. Mitra, NRR

(301) 504-2703 Stephen D. Alexander, NRR

(301) 504-2995 Attachments:

1. List of Recently Issued NRC Information Notices

• See EGGreenman memorandum to RLDennig dated June 15, 1994 and previous concurrence pages.

DOCUMFNT NAME! BKRGRSE.SDA

T7 -- Ih. M-U kIdiintm In

M this .kndoummAnt- the hox: 'C - CoDv without enclosures WE' - Copy with enclosures END - No copy

OFFICE Region III E [Recion III I E lRegion III I E Reio III E j

NAME TTella* RMendez* IGGrant* EGGreenman*

DATE 09/07/94 06/10/94 106/10/94 106/13/94 OFFICE OGCB NRR E ED [EELB/NRR E C:ECB/DOPS _DOPS

NAME RKiesel* A , SMitra* CBerlinger* BKGrimes

DATE 09/07/94 12/A0/94 09/22/94 10/26/94 12/ /94 OFFICE D:DE/NRR E C:SIB/DOTS I D/DOTS I l C:ECB/DOPS D:DOPS

1 AChaffee BKGrimes

NAME BWSheron* RGallo RLSpessard

DATE 11/01/94 12/ /94 12/ /94 112/ /94 12/ /94 OFFICIAL RECORD COPY

IN 94-XX

December 28, 1994 This information notice requires no specific action or written response. If

you have any questions about the information in this notice, please contact

one of the technical contacts listed below or the appropriate Office of

Nuclear Reactor Regulation (NRR) project manager.

Brian K. Grimes, Director

Division of Operating Reactor Support

Office of Nuclear Reactor Regulation

Technical contact(s): Tirupataiah Tella, Region III

(708) 829-9749 Rogelio Mendez, Region III

(708) 829-9745 Sikhindra K. Mltra, NRR

(301) 504-2703 Stephen D. Alexander, NRR

(301) 504-2995 Attachments:

1. List of Recently Issued NRC Information Notices

• See EGGreenman memorandum to RLDennig dated June 15, 1994 and previous concurrence pages. DOCUMENT NAME: NRCIN.471 As h *A.-m'n -4. dfj Un o

thA hnV C' - COnY without enclosures 'EW - CoDy with enclosures 'N' = No copy

OFFICE *Region III *Region III *Region III *Region III

NAME TTella RMendez GEGrant EGGreenman

DATE 9/ 7/94 6/10/94 6/10/94 6/13/94 OFFICE *OGCB/NRR *Tech Ed *EELB/NRR I*C:EELB/NRR

NAME RJKiessel JMain JM SKMitra CHBerlinger

DATE 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/NRR

BWSheron RGallo RLSpessard AEChaffee BKGrimes

11/01/94 12/ /94 12/ /94 12/ /94 12/

OFFICIAL RECORD COPY

IN 94-xx

October xx, 1994 In doing post maintenance testing, the licensees did not find evidence of

impending breaker failures because the tests were done mainly to determine

whether the breaker tripped or closed.

Related Generic Communications

Although involving a different type of circuit breaker, NRC IN 93-26, "Grease

Solidification Causes Molded-Ca'e Circuit Breaker Failure to Close," issued

April 7, 1993, and its supplement ssued January 31, 1994, described a similar

problem with grease solidification.

This information notice requires no spe fic action or written response. If

you have any questions about the informat n in this notice, please contact

one of the technical contacts listed below the appropriate Office of

Nuclear Reactor Regulation (NRR) project mana r.

Brian K. Grim , Director

Division of Ope0ating Reactor Support

Office of Nuclea Reactor Regulation

Technical contact(s): Tirupataiah Tella, Region III

(708) 829-9749 Rogelio Mendez, Region III

(708) 829-9745 Sikhindra K. Mitra, NRR

(301) 504-2703 Attachments:

1. List of Recently Issued NRC Information Notices

• see EGGreenman memorandum to RLDennig dated June 15, 1994 and Drevious concurrence pages I

OFFICE *Region III *Region III *Region III *Region III

NAME TTella RMendez GEGrant EGGreenman

DATE 9/ 7/94 6/10/94 6/10/94 6/13/94 OFFICE *OGCB/NRR *Tech Ed *EELB/NRR *C:EELB/NRR

NAME RJKiessel JMain JM SKMitra CHBerlinger

DATE 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/NRR

BWSheron RGalloj RLSpessard AEChaffee BKGrimes

11/01/94 11/ /94 11/ /94 11/ /94 11/ /94 DOCUMENT NAME: NRCIN.471

I

. IN 94-xx

October xx, 1994 In doing post maintenance testing, the licensees did not find evidence of

impending breaker failures because the tests were done mainly to determine

whether the breaker trfpped or closed.

Related Generic Communica'tions

Although involving a different type of circuit breaker, NRC IN 93-26, *Grease

Solidification Causes Molded-Ca Circuit Breaker Failure to Close," issued

April 7, 1993, and its supplement issued January 31, 1994, described a similar

problem with grease solidification.

This information notice requires no s cific action or written response. If

you have any questions about the informa ion In this notice, please contact

one of the technical contacts listed belo or the appropriate Office of

Nuclear Reactor Regulation (NRR) project ma ager.

Brian K. G mes, Director

Division of erating Reactor Support

Office of Nuc ar Reactor Regulation

Technical contact(s): Tirupataiah Tella, Region III

(708) 829-9749 Rogelio Mendez, Region III

(708) 829-9745 Sikhindra K. Mitra, NRR

(301) 504-2703 Attachments:

1. List of Recently Issued NRC Information Notices

• see EGGreenman memorandum to RLDennig dated June 15, 1994 and previous concurrence pages

a_ _ _ _ _ _ _ L _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

OFFICE *Region III *Region III *Region III *Region III

NAME TTella IRMendez GEGrant EGGreenman

DATE 9/ 7/94 6/10/94 6/10/94 6/13/94 OFFICE *OGCB/NRR *Tech Ed *EELB/NRR C gerL

NAME RJKiessel JMain JM SKMitra CH e nger

DATE 9/ 7/94 l 9/12/94 9/22/94 10 /94 OFFICE p:E/NR C:OECB/NRR l D:DOPS/NRR

NAME 7Biheron AEChaffee BKGrimes

DATE L/

I L/94 10/ /94 10/ /94 DOCUMENT NAME: NR5Ir\.471

IN 94-xx

September xx, 1994 In doing post ma tenance testing, the icensees did not find evidence of

impending breaker ilures because the were done mainly to determine whether

the breaker tripped closed. SW,

This information notice quires no specific action or written response.

you have any questions abo the information in this notice, please contactIf

one of the technical contact listed below or the appropriate Office of

Nuclear Reactor Regulation (NR project manager.

1an K. Grimes, Director

tvision of Operating Reactor Support

tkce of Nuclear Reactor Regulation

Technical 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 RLDennig dated June 15, 1994 and Drevious concurrence nBaan

OFFICE J* II

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• Region III *Region III *Region III

NAME TTella RMendez GEGrant EGGreenman

DATE I 9/ 7/94 6/10/94 6/10/94 1 6/13/94 .

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