Information Notice 1986-26, Potential Problems in Generators Manufactured by Electrical Products Incorporated: Difference between revisions

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{{#Wiki_filter:SSINS No.: 6835 IN 86-26 UNITED STATES NUCLEAR REGULATORY
{{#Wiki_filter:SSINS No.: 6835 IN 86-26 UNITED STATES


COMMISSION
NUCLEAR REGULATORY COMMISSION


OFFICE OF INSPECTION
OFFICE OF INSPECTION AND ENFORCEMENT


===AND ENFORCEMENT===
WASHINGTON, D.C. 20555 April 17, 1986 INFORMATION NOTICE NO. 86-26:    POTENT1AL PROBLEMS IN GENERATORS MANUFACTURED
WASHINGTON, D.C. 20555 April 17, 1986 INFORMATION


NOTICE NO. 86-26: POTENT1AL
BY ELECTRICAL PRODUCTS INCORPORATED
 
PROBLEMS IN GENERATORS
 
===MANUFACTURED===
BY ELECTRICAL
 
===PRODUCTS INCORPORATED===


==Addressees==
==Addressees==
:
:
All nuclear power reactor facilities
All nuclear power reactor facilities holding an operating license (OL) or a


holding an operating
construction permit (CP).
 
license (OL) or a construction
 
permit (CP).


==Purpose==
==Purpose==
: This notice is to alert recipients
:
This notice is to alert recipients to a potentially significant problem involving


to a potentially
the failure of Electrical Products Incorporated (EPI) diesel generators without


significant
prior warning during an emergency demand. Actions taken by licensees to prevent


problem involving the failure of Electrical
recurrence also are discussed. It is expected that recipients will review this


Products Incorporated (EPI) diesel generators
information for applicability to their facilities and consider actions, if


without prior warning during an emergency
appropriate, to preclude a similar problem occurring at their facilities.


demand. Actions taken by licensees
However, suggestions-contained in this information notice do not constitute NRC


to prevent recurrence
requirements; therefore, no specific action or written response is required.


also are discussed.
==Description of Circumstances==
 
:
It is expected that recipients
Washington Public Power Supply System (WPPSS) Unit 2 On July 21, 1983, emergency diesel generator (DG) 1A had high vibration level
 
will review this information
 
for applicability
 
to their facilities
 
and consider actions, if appropriate, to preclude a similar problem occurring
 
at their facilities.
 
However, suggestions-contained
 
in this information
 
notice do not constitute
 
NRC requirements;
therefore, no specific action or written response is required.Description
 
of Circumstances:
Washington
 
Public Power Supply System (WPPSS) Unit 2 On July 21, 1983, emergency
 
diesel generator (DG) 1A had high vibration
 
level readings accompanied
 
by sparks from the rotor shaft bearing area. Upon disas-sembly it was determined
 
that a shim, required to maintain clearance
 
at the thrust bearing, was missing. Inspection
 
of DG 1B showed that the same shim was missing. The two generators
 
were returned to EPI (Cleveland, Ohio) where the missing shim was installed
 
and the damaged areas refurbished.
 
The original design, which placed electrical
 
insulation
 
between the rotor shaft and the slip-ring
 
end bearing inner race, was maintained.
 
On July 9, 1984, during monthly surveillance
 
testing, a high vibration
 
alarm was observed on emergency
 
DG 1B. Investigation
 
after completion
 
of the 4-hour test revealed that the slip-ring
 
end bearing had turned on the shaft insulation
 
destroying
 
the insulation.
 
The reduction
 
in insulation
 
cross sectional
 
thick-ness allowed the rotor shaft to drop slightly and rub on the bearing housing.The corrective
 
action employed after this failure was a design modification.


The insulation
readings accompanied by sparks from the rotor shaft bearing area. Upon disas- sembly it was determined that a shim, required to maintain clearance at the


between the bearing and the shaft was removed and the bearing was mounted directly on the shaft. The bearing housing was insulated
thrust bearing, was missing. Inspection of DG 1B showed that the same shim was


to provide the required electrical
missing. The two generators were returned to EPI (Cleveland, Ohio) where the


insulation.
missing shim was installed and the damaged areas refurbished. The original


No failure has-been reported since the reported test failure in July 1984.8604150542
design, which placed electrical insulation between the rotor shaft and the
* IN 86-26 April 17. 19v6 Grand Gulf Unit 1 K>At Grand Gulf Unit 1, the high pressure core spray pump is powered by a dedicateu DG. On July 13, 1985, during surveillance


testing, the generator
slip-ring end bearing inner race, was maintained.


failed and was observed to be emitting sparks. Power Systems Division (PSD) of Morrison Knudsen, the supplier of the DG unit, determined
On July 9, 1984, during monthly surveillance testing, a high vibration alarm


that the electrical
was observed on emergency DG 1B. Investigation after completion of the 4-hour


insulation
test revealed that the slip-ring end bearing had turned on the shaft insulation


between the inner race of the cylindrical
destroying the insulation. The reduction in insulation cross sectional thick- ness allowed the rotor shaft to drop slightly and rub on the bearing housing.


roller bearing at the slip-ring
The corrective action employed after this failure was a design modification.


end and the rotor shaft had degraded.
The insulation between the bearing and the shaft was removed and the bearing


The degradation
was mounted directly on the shaft. The bearing housing was insulated to provide


allowed the shaft to drop down and rub the inner and outer oil seals causing the sparks. EPI and PSD have developed a procedure
the required electrical insulation. No failure has-been reported since the


to implement
reported test failure in July 1984.


the same design modification
8604150542


at Grand Gulf as used previously
*                      IN 86-26 April 17. 19v6 Grand Gulf Unit 1                                                                        K>
  At Grand Gulf Unit 1, the high pressure core spray pump is powered by


at WPPSS.Watts Bar Unit 2 On June 10, 1983, during the performance
a dedicateu


of a test, the generator
DG. On July 13, 1985, during surveillance testing, the generator failed


shaft was observed to be rubbing against the inner and outer oil seals at the slip-ring end. Examination
observed to be emitting sparks. Power Systems Division (PSD) of Morrison and was


after disassembly
the supplier of the DG unit, determined that the electrical insulation          Knudsen, the inner race of the cylindrical roller bearing at the slip-ring end      between


revealed that the thickness
rotor shaft had degraded. The degradation allowed the shaft to drop and the


of the oil thrower was less than specified, causing a mismatch between the inner and outer races of the slip-ring
rub the inner and outer oil seals causing the sparks. EPI and PSD      down and


end bearing that resulted in the inner race breaking loose and turning on the underlying
a procedure to implement the same design modification at Grand Gulf have    developed


electrical
previously at WPPSS.                                                  as  used


insulation.
Watts Bar Unit 2 On June 10, 1983, during the performance of a test, the generator


The repairs at a Tennessee
observed to be rubbing against the inner and outer oil seals at theshaft was


Valley Authority (TVA) workshop consisted
end. Examination after disassembly revealed that the thickness of slip-ring


of rebuil-ding oil seals, polishing
thrower was less than specified, causing a mismatch between the innerthe oil


the shaft under the oil seals, replacing
races of the slip-ring end bearing that resulted in the inner race        and outer


the insula-tion material under the bearing, machining
loose and turning on the underlying electrical insulation.          breaking


the bearing housing cap to correct the alignment, adding a shim to restrain the outer race, and installing
The repairs at a Tennessee Valley Authority (TVA) workshop consisted


new bearings.
ding oil seals, polishing the shaft under the oil seals, replacing      of rebuil- the


TVA inspected
tion material under the bearing, machining the bearing housing cap to insula- the alignment, adding a shim to restrain the outer race, and installingcorrect


four other generators
bearings. TVA inspected four other generators and made similar modifications.new
 
and made similar modifications.


Background:
Background:
The failures occurred in electrical
The failures occurred in electrical generators manufactured at EPI located


generators
Cleveland, Ohio. EPI was a division of Portec from 1969-1979. In 1979,            in


manufactured
sold EPI to Northern Electrical Industries-Parsons Peebles (NEI-Peebles)      Portec


at EPI located in Cleveland, Ohio. EPI was a division of Portec from 1969-1979.
Great Britain. The manufacturing operations at Cleveland ceased in             of


In 1979, Portec sold EPI to Northern Electrical
the


Industries-Parsons
1984. Currently, EPI furnishes spare parts and modifications to existing    Fall  of


Peebles (NEI-Peebles)
units.
of Great Britain. The manufacturing


operations
Discussion:
The failures described above have all occurred at the slip-ring end


at Cleveland
diesel engine configurations. Installation of the insulation betweenof the tandem


ceased in the Fall of 1984. Currently, EPI furnishes
the rotor


spare parts and modifications
shaft and the bearing also is used for single engine applications and


to existing units.Discussion:
cases it is installed under the shaft bearing at the other end of the in some
The failures described


above have all occurred at the slip-ring
as well. The purpose of the insulation (3M Scotchply brand, type 1009,generator


end of the tandem diesel engine configurations.
composite tape) is to prevent circulating currents through the generator glass/epoxy


Installation
This insulation method was limited by EPI to 8-pole 900-rpm machines.          shaft.


of the insulation
initiating failure mechanism of the insulation has been attributed by      The


between the rotor shaft and the bearing also is used for single engine applications
sources to insulation creep fatigue, misalignment of the engines, poor    various


and in some cases it is installed
workmanship, or inadequate original design. The first WPPSS and the        insulation


under the shaft bearing at the other end of the generator as well. The purpose of the insulation
failures appear-to be isolated cases of improperly machined pieces;    Watts    Bar


(3M Scotchply
however, the


brand, type 1009, glass/epoxy
failures manifest themselves in a similar manner and may be discovered


composite
checks for insulation damage.                                              during the


tape) is to prevent circulating
IN 86-26 April 17, 1986 PSD has stated that a procedure to monitor shaft movement will have to be specific


currents through the generator
for each plant because of design differences that impact the allowable movement


shaft.This insulation
and the jacking force. Jacking the shaft up and down and recording the movement


method was limited by EPI to 8-pole 900-rpm machines.
will determine the vertical play between the shaft and bearing housing, out care


The initiating
should be taken to use a load cell or circle force gauge between the jack and


failure mechanism
the generator shaft to prevent damage.


of the insulation
Other suppliers that have used EPI generators include Stewart & Stevenson, Alco


has been attributed
and Bruce GM (EMD). See Attachment 1 for a list of facilities identified oy


by various sources to insulation
EPI and PSD as recipients of the subject generators. Some of the generators


creep fatigue, misalignment
of the engines, poor insulation
workmanship, or inadequate
original design. The first WPPSS and the Watts Bar failures appear-to
be isolated cases of improperly
machined pieces; however, the failures manifest themselves
in a similar manner and may be discovered
during the checks for insulation
damage.
IN 86-26 April 17, 1986 PSD has stated that a procedure
to monitor shaft movement will have to be specific for each plant because of design differences
that impact the allowable
movement and the jacking force. Jacking the shaft up and down and recording
the movement will determine
the vertical play between the shaft and bearing housing, out care should be taken to use a load cell or circle force gauge between the jack and the generator
shaft to prevent damage.Other suppliers
that have used EPI generators
include Stewart & Stevenson, Alco and Bruce GM (EMD). See Attachment
1 for a list of facilities
identified
oy EPI and PSD as recipients
of the subject generators.
===Some of the generators===
nave been resold from the original customer or user and some have been cancelled;
nave been resold from the original customer or user and some have been cancelled;
therefore
therefore specific plant applications may be different than originally supplied.
 
specific plant applications
 
may be different


than originally
No specific action or written response is required by this notice. If you nave


supplied.No specific action or written response is required by this notice. If you nave any questions
any questions regarding this notice, please contact the Regional Aaministrator


regarding
of the appropriate NRC regional office or this office.


this notice, please contact the Regional Aaministrator
X\visli/f


of the appropriate
Edward L ordan, Director


NRC regional office or this office.X\visli/f Edward L ordan, Director Divisior of Emergency
Divisior of Emergency Preparedness


===Preparedness===
and Engineering Response
and Engineering


Response Office of Inspection
Office of Inspection and Enforcement


and Enforcement
Tecnnical Contacts:  James C. Stewart, IE


Tecnnical
(301) 492-9061 K.R. Naidu, IE


Contacts:
(301) 492-4179 Attachments:
James C. Stewart, IE (301) 492-9061 K.R. Naidu, IE (301) 492-4179 Attachments:


===I. List of EPI 900 RPM Generators===
===I.   List of EPI 900 RPM Generators===
2. List of Recently Issued IE Information
2. List of Recently Issued IE Information Notices


Notices
Attachment 1 IN 86-26 April 17, 1986 Domestic EPI 900 RPM Generators


Attachment
Customer/Site                      No. Units                D/G Supplier


1 IN 86-26 April 17, 1986 Domestic EPI 900 RPM Generators
Arkansas P&L/Nuclear 1                   2                  Stewart & Stevenson


Customer/Site
Boston Edison/Pilgrim 1                  2                  ALCO


No. Units D/G Supplier Arkansas P&L/Nuclear
Duke Power/Oconee                        1                  PSD


1 Boston Edison/Pilgrim
Florida P&L/St. Lucie                    2                  PSD


1 Duke Power/Oconee
Houston L&P/Allens Creek                  1 (See Note 1)      PSD


Florida P&L/St. Lucie Houston L&P/Allens
Jersey Central P&L/Oyster Creek          2 (See Note 2)      PSD


Creek Jersey Central P&L/Oyster
Mississippi P&L/Grand Gulf                2                  PSD


Creek Mississippi
Mississippi P&L/Grand Gulf                2                  Bruce GM (EMD)
New York State Power                      4                  Bruce GM (EMD)
  Authority/FitzPatrick


P&L/Grand
Pacific G&E/Diablo Canyon                5                  ALCO


Gulf Mississippi
Portland G&E/Trojan                      2                  PSD


P&L/Grand
Public Service of Oklahoma/Black Fox      2 (See Note 3)    PSD


Gulf New York State Power Authority/FitzPatrick
Puget Sound/Skaggit                      1                  PSD


Pacific G&E/Diablo
SMUD/Rancho Seco                          2                  Bruce GM (EMD)
TVA/Hartsville, Phipps Bend              6 (See Note 4)    PSD


Canyon Portland G&E/Trojan
TVA/Sequayah                              4                  Bruce GM (EMD)
TVA/Sequayah                              1                  PSD


Public Service of Oklahoma/Black
TVA/Watts Bar                            6                  PSD


Fox Puget Sound/Skaggit
Vepco/North Anna                          4                  Stewart & Stevenson


SMUD/Rancho
WPPSS/Hanford 1                          2                  Stewart & Stevenson


Seco TVA/Hartsville, Phipps Bend TVA/Sequayah
Notes:    1.  Generator returned to PSD


TVA/Sequayah
2.  Obtained from TVA


TVA/Watts
3.  One unit sent to foreign plant, one unit spare


Bar Vepco/North
4.  Two units to Oyster Creek, three units sent to foreign plants, one unit sent to NASA


Anna WPPSS/Hanford
Attachnient 2 IIN 86-26 April 17,  1986 LIST OF RECENTLY ISSUED


1 2 2 1 2 1 2 2 2 4 5 2 2 1 2 6 4 1 6 4 2 (See Note 1)(See Note 2)(See Note 3)(See Note 4)Stewart & Stevenson ALCO PSD PSD PSD PSD PSD Bruce GM (EMD)Bruce GM (EMD)ALCO PSD PSD PSD Bruce GM (EMD)PSD Bruce GM (EMD)PSD PSD Stewart & Stevenson Stewart & Stevenson Notes: 1. Generator
IE INFORMATION NOTICES


returned to PSD 2. Obtained from TVA 3. One unit sent to foreign plant, one unit spare 4. Two units to Oyster Creek, three units sent to foreign plants, one unit sent to NASA
Information                                  Date of


Attachnient
Notice No.    Subject                        Issue  __Issued to-
86-25          Traceability And Material      4/11/86    All power reactor


2 IIN 86-26 April 17, 1986 LIST OF RECENTLY ISSUED IE INFORMATION
Control Of Material And                    facilities holding


NOTICES Information
Equipment, Particularly                    an OL or CP


Date of Notice No. Subject Issue __Issued to-86-25 Traceability
Fasteners


And Material Control Of Material And Equipment, Particularly
86-24          Respirator Users Notice:      4/11/86    All power reactor


Fasteners 4/11/86 86-24 Respirator
Increased Inspection Frequency            facilities holding


Users Notice: 4/11/86 Increased
For Certain Self-Contained                an OL or CP; research


Inspection
Breathing Apparatus Air                    and test reactor


Frequency For Certain Self-Contained
Cylinders                                  facilities; fuel


Breathing
cycle licensees and


Apparatus
Priority 1 material


Air Cylinders 86-23 86-22 86-21 Excessive
licensees


Skin Exposures
86-23          Excessive Skin Exposures Due  4/9/86      All power reactor


Due To Contamination
To Contamination With Hot                  facilities holding


With Hot Particles Underresponse
Particles                                 an OL or CP


Of Radition Survey Instrument
86-22          Underresponse Of Radition     3/31/86    All power reactor


To High Radiation
Survey Instrument To High                 facilities holding


Fields Recognition
Radiation Fields                           an OL or CP and


===Of American Society Of Mechanical===
research and test
Engineers


===Accreditation===
reactors
Program For N Stamp Holders Low-Level


Radioactive
86-21          Recognition Of American        3/31/86    All power reactor


Waste Scaling Factors, 10 CFR Part 61 Reactor Coolant Pump Shaft Failure At Crystal River NRC On-Scene Response During A Major Emergency 4/9/86 3/31/86 3/31/86 3/28/86 3/21/86 3/26/86 All power reactor facilities
Society Of Mechanical                      facilities holding


holding an OL or CP All power reactor facilities
Engineers Accreditation                    an OL or CP and all


holding an OL or CP; research and test reactor facilities;
Program For N Stamp Holders                recipients of NUREG-
fuel cycle licensees
                                                          0040 (white book)
86-20          Low-Level Radioactive Waste    3/28/86    All power reactor


and Priority 1 material licensees All power reactor facilities
Scaling Factors, 10 CFR                    facilities holding


holding an OL or CP All power reactor facilities
Part 61                                    an OL or CP


holding an OL or CP and research and test reactors All power reactor facilities
86-19          Reactor Coolant Pump Shaft    3/21/86    All power reactor


holding an OL or CP and all recipients
Failure At Crystal River                  facilities holding


of NUREG-0040 (white book)All power reactor facilities
an OL or CP


holding an OL or CP All power reactor facilities
86-18          NRC On-Scene Response During  3/26/86    All power reactor


holding an OL or CP All power reactor facilities
A Major Emergency                          facilities holding


holding an OL or CP 86-20 86-19 86-18 OL = Operating
an OL or CP


License CP = Construction
OL = Operating License


Permit}}
CP = Construction Permit}}


{{Information notice-Nav}}
{{Information notice-Nav}}

Latest revision as of 03:04, 24 November 2019

Potential Problems in Generators Manufactured by Electrical Products Incorporated
ML031220661
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, 05000000, Zimmer, Fort Saint Vrain, Shoreham, Satsop, Trojan, Atlantic Nuclear Power Plant, Skagit, Marble Hill
Issue date: 04/17/1986
From: Jordan E
NRC/IE
To:
References
IN-86-026, NUDOCS 8604150542
Download: ML031220661 (5)
v • d • e


SSINS No.: 6835 IN 86-26 UNITED STATES

NUCLEAR REGULATORY COMMISSION

OFFICE OF INSPECTION AND ENFORCEMENT

WASHINGTON, D.C. 20555 April 17, 1986 INFORMATION NOTICE NO. 86-26: POTENT1AL PROBLEMS IN GENERATORS MANUFACTURED

BY ELECTRICAL PRODUCTS INCORPORATED

Addressees

All nuclear power reactor facilities holding an operating license (OL) or a

construction permit (CP).

Purpose

This notice is to alert recipients to a potentially significant problem involving

the failure of Electrical Products Incorporated (EPI) diesel generators without

prior warning during an emergency demand. Actions taken by licensees to prevent

recurrence also are discussed. It is expected that recipients will review this

information for applicability to their facilities and consider actions, if

appropriate, to preclude a similar problem occurring at their facilities.

However, suggestions-contained in this information notice do not constitute NRC

requirements; therefore, no specific action or written response is required.

Description of Circumstances

Washington Public Power Supply System (WPPSS) Unit 2 On July 21, 1983, emergency diesel generator (DG) 1A had high vibration level

readings accompanied by sparks from the rotor shaft bearing area. Upon disas- sembly it was determined that a shim, required to maintain clearance at the

thrust bearing, was missing. Inspection of DG 1B showed that the same shim was

missing. The two generators were returned to EPI (Cleveland, Ohio) where the

missing shim was installed and the damaged areas refurbished. The original

design, which placed electrical insulation between the rotor shaft and the

slip-ring end bearing inner race, was maintained.

On July 9, 1984, during monthly surveillance testing, a high vibration alarm

was observed on emergency DG 1B. Investigation after completion of the 4-hour

test revealed that the slip-ring end bearing had turned on the shaft insulation

destroying the insulation. The reduction in insulation cross sectional thick- ness allowed the rotor shaft to drop slightly and rub on the bearing housing.

The corrective action employed after this failure was a design modification.

The insulation between the bearing and the shaft was removed and the bearing

was mounted directly on the shaft. The bearing housing was insulated to provide

the required electrical insulation. No failure has-been reported since the

reported test failure in July 1984.

8604150542

  • IN 86-26 April 17. 19v6 Grand Gulf Unit 1 K>

At Grand Gulf Unit 1, the high pressure core spray pump is powered by

a dedicateu

DG. On July 13, 1985, during surveillance testing, the generator failed

observed to be emitting sparks. Power Systems Division (PSD) of Morrison and was

the supplier of the DG unit, determined that the electrical insulation Knudsen, the inner race of the cylindrical roller bearing at the slip-ring end between

rotor shaft had degraded. The degradation allowed the shaft to drop and the

rub the inner and outer oil seals causing the sparks. EPI and PSD down and

a procedure to implement the same design modification at Grand Gulf have developed

previously at WPPSS. as used

Watts Bar Unit 2 On June 10, 1983, during the performance of a test, the generator

observed to be rubbing against the inner and outer oil seals at theshaft was

end. Examination after disassembly revealed that the thickness of slip-ring

thrower was less than specified, causing a mismatch between the innerthe oil

races of the slip-ring end bearing that resulted in the inner race and outer

loose and turning on the underlying electrical insulation. breaking

The repairs at a Tennessee Valley Authority (TVA) workshop consisted

ding oil seals, polishing the shaft under the oil seals, replacing of rebuil- the

tion material under the bearing, machining the bearing housing cap to insula- the alignment, adding a shim to restrain the outer race, and installingcorrect

bearings. TVA inspected four other generators and made similar modifications.new

Background:

The failures occurred in electrical generators manufactured at EPI located

Cleveland, Ohio. EPI was a division of Portec from 1969-1979. In 1979, in

sold EPI to Northern Electrical Industries-Parsons Peebles (NEI-Peebles) Portec

Great Britain. The manufacturing operations at Cleveland ceased in of

the

1984. Currently, EPI furnishes spare parts and modifications to existing Fall of

units.

Discussion:

The failures described above have all occurred at the slip-ring end

diesel engine configurations. Installation of the insulation betweenof the tandem

the rotor

shaft and the bearing also is used for single engine applications and

cases it is installed under the shaft bearing at the other end of the in some

as well. The purpose of the insulation (3M Scotchply brand, type 1009,generator

composite tape) is to prevent circulating currents through the generator glass/epoxy

This insulation method was limited by EPI to 8-pole 900-rpm machines. shaft.

initiating failure mechanism of the insulation has been attributed by The

sources to insulation creep fatigue, misalignment of the engines, poor various

workmanship, or inadequate original design. The first WPPSS and the insulation

failures appear-to be isolated cases of improperly machined pieces; Watts Bar

however, the

failures manifest themselves in a similar manner and may be discovered

checks for insulation damage. during the

IN 86-26 April 17, 1986 PSD has stated that a procedure to monitor shaft movement will have to be specific

for each plant because of design differences that impact the allowable movement

and the jacking force. Jacking the shaft up and down and recording the movement

will determine the vertical play between the shaft and bearing housing, out care

should be taken to use a load cell or circle force gauge between the jack and

the generator shaft to prevent damage.

Other suppliers that have used EPI generators include Stewart & Stevenson, Alco

and Bruce GM (EMD). See Attachment 1 for a list of facilities identified oy

EPI and PSD as recipients of the subject generators. Some of the generators

nave been resold from the original customer or user and some have been cancelled;

therefore specific plant applications may be different than originally supplied.

No specific action or written response is required by this notice. If you nave

any questions regarding this notice, please contact the Regional Aaministrator

of the appropriate NRC regional office or this office.

X\visli/f

Edward L ordan, Director

Divisior of Emergency Preparedness

and Engineering Response

Office of Inspection and Enforcement

Tecnnical Contacts: James C. Stewart, IE

(301) 492-9061 K.R. Naidu, IE

(301) 492-4179 Attachments:

I. List of EPI 900 RPM Generators

2. List of Recently Issued IE Information Notices

Attachment 1 IN 86-26 April 17, 1986 Domestic EPI 900 RPM Generators

Customer/Site No. Units D/G Supplier

Arkansas P&L/Nuclear 1 2 Stewart & Stevenson

Boston Edison/Pilgrim 1 2 ALCO

Duke Power/Oconee 1 PSD

Florida P&L/St. Lucie 2 PSD

Houston L&P/Allens Creek 1 (See Note 1) PSD

Jersey Central P&L/Oyster Creek 2 (See Note 2) PSD

Mississippi P&L/Grand Gulf 2 PSD

Mississippi P&L/Grand Gulf 2 Bruce GM (EMD)

New York State Power 4 Bruce GM (EMD)

Authority/FitzPatrick

Pacific G&E/Diablo Canyon 5 ALCO

Portland G&E/Trojan 2 PSD

Public Service of Oklahoma/Black Fox 2 (See Note 3) PSD

Puget Sound/Skaggit 1 PSD

SMUD/Rancho Seco 2 Bruce GM (EMD)

TVA/Hartsville, Phipps Bend 6 (See Note 4) PSD

TVA/Sequayah 4 Bruce GM (EMD)

TVA/Sequayah 1 PSD

TVA/Watts Bar 6 PSD

Vepco/North Anna 4 Stewart & Stevenson

WPPSS/Hanford 1 2 Stewart & Stevenson

Notes: 1. Generator returned to PSD

2. Obtained from TVA

3. One unit sent to foreign plant, one unit spare

4. Two units to Oyster Creek, three units sent to foreign plants, one unit sent to NASA

Attachnient 2 IIN 86-26 April 17, 1986 LIST OF RECENTLY ISSUED

IE INFORMATION NOTICES

Information Date of

Notice No. Subject Issue __Issued to-

86-25 Traceability And Material 4/11/86 All power reactor

Control Of Material And facilities holding

Equipment, Particularly an OL or CP

Fasteners

86-24 Respirator Users Notice: 4/11/86 All power reactor

Increased Inspection Frequency facilities holding

For Certain Self-Contained an OL or CP; research

Breathing Apparatus Air and test reactor

Cylinders facilities; fuel

cycle licensees and

Priority 1 material

licensees

86-23 Excessive Skin Exposures Due 4/9/86 All power reactor

To Contamination With Hot facilities holding

Particles an OL or CP

86-22 Underresponse Of Radition 3/31/86 All power reactor

Survey Instrument To High facilities holding

Radiation Fields an OL or CP and

research and test

reactors

86-21 Recognition Of American 3/31/86 All power reactor

Society Of Mechanical facilities holding

Engineers Accreditation an OL or CP and all

Program For N Stamp Holders recipients of NUREG-

0040 (white book)

86-20 Low-Level Radioactive Waste 3/28/86 All power reactor

Scaling Factors, 10 CFR facilities holding

Part 61 an OL or CP

86-19 Reactor Coolant Pump Shaft 3/21/86 All power reactor

Failure At Crystal River facilities holding

an OL or CP

86-18 NRC On-Scene Response During 3/26/86 All power reactor

A Major Emergency facilities holding

an OL or CP

OL = Operating License

CP = Construction Permit


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