ML19329E373
| ML19329E373 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 04/14/1978 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 8006120686 | |
| Download: ML19329E373 (1) | |
Text
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n CENTRAL FILE.9 APR 141978
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Docket No. 50-329 Docket No. 50-330 THIS DOCUMENT CONTAINS consumers Po.or company POOR QUAllTY PAGES ATTN: Mr. Stephen H. Howell Vice President 1945 West Parnall Road Jackson, MI 49201 Gentlemen:
Enclosed is IE Bulletin No. 78-05 which requires action by you with regard to your power reactor facilities with an operating license or a construction permit.
Should you have questions regarding this Bulletin or the actions required of you, please contact this offica.
Sincerely, i
1 l
James G. Eeppler Director
Enclosures:
1.
List of IE Bulletina Issued in 1978 cc w/ encl:
/contral Piles Reproduction Unit NRC 20b PDE Local PDE NSIC TIC
~ ~ '. ~ ~ ~ ' Ronald Callen, Michigan Public Service c==4=sion Dr. Wayne E. North Myron M. Cherry, Chicago g
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_III RIII R
orriCE >
Heidman/bk ppler sumname >
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_4[1kf7b DATE D MRC Form 318A (R2El (5-76) NRCM O2040
+0. 5. GOVERNMENT PRINTING OFFICE: 1978-253-81 8006y30 [ h G
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U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT REGION III April 14, 1978 IE Bulletin No. 78-05 MALFUNCTIONING OF CIRCUIT BREAKER AUXILIARY CONTACT MECHANISM -
GENERAL ELECTRIC MODEL CR105X Description of Ciressastances:
The Sacramento Municipal Utility District recently reported a problem encountered with the operation of the GE Model CR105X auxiliary contact mechanism installed in a 480 volt circuit breaker. Investigation into the cause for the inability to shutdown a booster supply fan (SF-A-7) in the control room emergency air conditioning system revealed that an auxiliary contact (GE Model CR105X) had failed in the closed position, preventing the fan's power supply circuit breaker from opening. The specific cause for failure was binding of the plunger arm due to burrs 4
and nicks on its surface.
An investigation was conducted by the licensee to determine the extent of usage of this type auxiliary contact in other circuits throughout the reactor power plant. Approximately fifty (50) positions in the nuclear
.l service motor control centers were identified as having a similar type j
auxiliary contact mechanism. It was also determined that many of the j
affected systems which require contact operation similar to that described above, either permit or provide a safety feature function during emergency conditions. An example of this type application is j
auxiliary contacts that must open to permit closing of certain safety related valves from 480 volt motor control centers.
The attached GE Service Advice Letter and associated instruction / drawing sheet were sent to all nuclear power reactor facilities by GE Field Service Offices. The letter, together with the instruction / drawing
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sheet identifies the problem and provides the reconsnended corrective action.
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Action To Be Taken By Licensees:
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for all power reactor facilities with an operating license or construction tf p ~c' m
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IE sulletin 78-05 April 14, 1978 1.
If you have received the enclosed General Electric letter and instruction / drawing sheet addressing tb auxiliary contact i
mechanism problem, and if you have these devices in use at your facility, it is requested that you describe what correc-tive action you have taken.
2.
If you have not received the enclosed GE documents before, it is requested that you describe what action you plan to take if the GE CR105X auxiliary contact mechanism is in use or' planned for o
use in safety systems at your facility (ies).
3.
Facilities having an operating license should report in writing, within 45 days, and facilities with construction permits within 60 days, the results of action taken or planned with regard to Items 1 and 2 above. Your written reply should also include the date when such actions were or will be completed. Reports should be submitted to the Director of the appropriate NkC Regional office and a copy should be forwarded to the U. S. Nuclear Regulatory Commission, Office of Inspection and Enforcement.
Division of Reactor Operations Inspection, Office of Inspection and Enforcement, Washington, D, C, 20555.
Approved by GAO, B180225 (R0072); clearance expires 7/31/80. Approval was given under a blanket clearance specifically for identified generic problems.
Attachments:
1.
GE Letter 2.
GE Control and Instruction Sheet O
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It has been brought to our attention that a potential binding problem may exist with the 100 Line CR105X... auxiliary interlocks mounted on NEMA size 00. O and 1 contactors, starters, or reversers used in control equha.nt manufactured by Car.eral Electric Co. (including 77001.ine motor control centers) and ot'.er control equip:nent manufacturers. The interlocks involved are used on the following devices.
CR105A,. -B., -C, -H, -J, -K, -R, -S with additional suffix letters and numbers (contactors)
CR106A. -B, -C, -H, -J.
-K, -R, -S with additional suffix letters i
.and numbers (starters) i CR109A, -B, -C, -H. -J,
-K, R, -S with additional suffix letters j
ard numbers (reversing starters)
If any of these devicei are currently used in your installations, you shouTd obtain replacement parts to correct this condition by forwarding l
the following information to sty attention:
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l 1.
Complete catalog (CR) numbers on device nameplate.
l 2.
Quantity of each device catalog number.
i 3.
Are the auxiliary interlocks mounted on the left side, right 8
side, or both sides of the device? How many are there at each location?
Since the General Purpose Control Department of the General Electric Co.
does not know all applications of these interlockG it is assumed that some may be in " critical" applications and should be changed out as soon as possible, while those in non-critical applications may be changed out at some
.[
l routine maintenance period.
Since these interlocks are'on devices which have been in service for
,t overone(1)yearandareoutofournormalwarrantyperiod,wefeela fair and equitable solution would require that the necessary parts and g
i instructions for the suggested changeout be provided by GE at no expense p.
l to the user. At your earliest convenience, please provide me with the f
information requested in paragraph 2 of this letter so that the necessary parts may be provided.
t; i'
This infonnation should be forwarded to:
General " Electric Company P. O. Box 2913
.(,
Bloomington, Illinois 61701 i
t Attention: Mr. John E. Corbitt r
Product Service (Dial Cimn:. 8*325-4416..or4294)
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IN S T R U CTIO N!
105X AUXILIARY CONTACT (CHANGEOUT OF PLUNGER ARM AND INSULATION)
)
for nema size 0 &1 magnetic starters and contactors CHANGING PLUNGEft ARM & INSULATION (SEEFIC. 21 REMOVING OVERLOAD RELAY BRACKET (SEE F1G.13 S ide plunger assembly out of avaihary contact block, by lifting 1.
up and out.
1.
Remove all electrical power from device.
2.
Select the new plunger arm that is bent the same way as the one 2.
Orsassemble device by pressing on the cost while pulling out on installed.
the cont retainers. Move rutainers back and away from cnil 3.
Loosen screw on plunger to release metal arm but DO NOT 3.
Grass movable portion of magnet and pull out. removing REMOVE SCREW FROM PHENOLIC PLUNGER (OR magnet assembly, coil. molded cover and movable arm la one motiott (NOTE: On reversers or multispeed starters, this _
PLUNGERS).
4 Mount new pfunger arm on plunger. Fa sten arm to plunger with snagnet assembly is linked to the mechanical interfack arm screw (or plunger post if insta!!ing double aux, blocks).
betwee, contactors and should be tipped toward ictertock ann
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5.
Appfy than coat of aeroshell grease along plunger guedet to facaht. te easy removal) 6.
Reinstals plunger assembty in contact block.
4.
Remove wortond relay bracket by. sliding it out of the kW 7.
slots in he molded base. (NOTE: If any vn,tes are too short t Reassemble overioed to mounting bracket. Remove overiosd allow easy removet temporanly desconnect these.)
insulation and ir: stall new. (NOTE: Overtoedinsutstion must be 5.
Remove overload relay from bracket by loosening screw on W and rep'tettW Mulp suppWW r
g bottom at oversoad bracket.
9 Reconnect any wires p*eviously removed.
- 10. Reassemble magnet ascemory to contact base (on reversers or multispeeds be sure to e tterlock this assemby with ratchanicat
,,,,.wp laterlock arm. Check fr. free movement of armature assemMes OVEALOA D RELAY MOUNTINQ e_RAEE,T,_J (..
and mechanicaUnt.accks).
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- 11. Observe that auxiliary contact plunger assemblies are operating
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properly.
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j FIGURE 1 REMovlNG CVERLOAD RELAY MOUNTING BRACKET
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. GENERAL PJRPOSE CONTROL DEPARTMENT ecMCDAI E I E. f y D l atoowarvororv. LLsNoss 61701 U E 51 L n M b E. b a en a
IE Bulletin No. 78-05 April 14, 1978 4
LISTING OF IE BULLETINS ISSUED IN 1978 Bulletin Subject Date Issued Issued To No.
78-01 Flammable Contact -
1/16/78 All Power Reactor Arm Retainers in G.E.
Facilitfas with an CR120A Relays Operating License (OL) cr Construc-tion Permit (CP) 78-02 Terminal Block 1/30/78 All Power Reactor Qualification Facilities with an Operating License (OL) or Constriu-tion Permit (CP) 78-03 Potential Explosive 2/8/78 All BWR Power Gas Mixture Accumula-Reactor Facilities tions Associated with with an Operating i
BWR Offgas System License (OL)
Operations 78-04 Environmental Quali-2/21/78 All Power Reactor fication of Certain Facilities with an Stem Mounted Limit Operating License Switches Inside (OL) or Construc-I Reactor Containment tion Permit (CP) 4 i
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