ML20151S183
| ML20151S183 | |
| Person / Time | |
|---|---|
| Issue date: | 04/20/1988 |
| From: | Rivenbark G Office of Nuclear Reactor Regulation |
| To: | NRC |
| References | |
| IEB-88-003, IEB-88-3, NUDOCS 8804280222 | |
| Download: ML20151S183 (2) | |
Text
April 20, 1988 MEMORANDUM FOR:
All Project Managers FROM:
George Rivenbark, Senior Project Manager Project Directorate I-?
Division of Reactor Projects I/II SURJECT:
REVIEW 0F RESPONSES TO NRC BULLETIN 88-03:
INADE0VATE LATCH ENGAGEVENT IN HFA TYPE LATCHING RELAYS MANUFACTURED BY GENERAL ELECTRIC (GE) COMPANY The reporting requirements of NRC Pulletin 88-03, issued March 10, 1988, require holders of operating licenses or construction permits to provide letters of confirmation to the NRC of the completion of specified inspections on GE HFA type latching relays.
These letters are to include the number of relays of each type insopcted, the number of relays of each type requiring corrective actions due to incorrect distance between the top of the contact carrier end the top of the relay armature and the number of relays of each type requiring corrective actions due to the latch not being fully rotated.
These letters of confirmation are to be submitted within 30 days of completion of the Bulletin's spacified inspections. Addressees who do not have GE HFA type latching relays in Class IE service were requested to provide a letter to the NRC stating this fact within 170 days of receipt of the bulletin.
A copy of Bulletin 88-03 is attached to this memorandum.
The lead project nanager for this Bulletin is George Rivenbark (X21422).
Technical contacts for this Bulletin are Kanal Naidu (X20980) and Ed Baker (XP3221).
PMs should review their licensee's responses to assure that the appropriate confirmation is received.
Please inform me and send me a copy of your licensee's response when you receive an appropriate response.
Should you have any questions regarding the response by your plant, contact ne or the other two Bulletin contacts.
/S/
George Rivenbark, Senior Project Manager
)
Project Directorate I-2 1
Division of Reactor Projects I/II cc:
K. Naidu E. Baker DISTRIBUTION.
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April 20, 1988 MEMORANDUM FOR:
All Project Managers FROM:
George Rivenbark, Senior Project Manager Project Directorate I-2 Division of Reactor Projects I/II
SUBJECT:
REVIEW 0F RESPONSES TO NRC BULLETIN 88-03:
INADEQUATE LATCH ENGAGEMENT IN HFA TYPE LATCHING RELAYS MANUFACTURED BY GENERAL ELECTRIC (GE) COMPANY The reporting requirements of NRC Bulletin 88-03, issued March 10, 1988, require holders of operating licenses or construction permits to provide letters of confirmation to the NRC of the completion of specified inspections on GE HFA type latching relays. These letters are to include the number of relays of each type inspected, the number of relays of each type requiring corrective actions due to incorrect distance between the top of the contact carrier and the top of the relay armature and the number of relays of each type requiring corrective actions due to the latch not being fully rotated.
These letters of confirmation are to be submitted within 30 days of completion of the Bulletin's specified inspections.
Addressees who do not have GE HFA type latching relays in Class 1E service were requested to provide a letter to the NRC stating this fact within 120 days of receipt of the bulletin.
A copy of Bulletin 88-03 is attached to this memorandum.
The lead project manager for this Bulletin is George Rivenbark (X?1422). Technical contacts i
for this Bulletin are Kamal Naidu (X20980) and Ed Baker (X23221).
PMs should review their licensee's responses to assure that the appropriate confirmation is received.
Please inform me and send me a copy of your licensee's response when you receive an appropriate response.
Should you have any questions regarding the response by your plant, contact re or the other two Bulletin contacts.
George Rivanbark, Senior Project Manager Project Directorate I-2 Division of Reactor Projects I/II cc:
K. Naidu E. Baker
1 Mf0 3
OMB No.: 31500011 NRCR 88-03 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF NUCLEAR REACTOR REGULATION WASHINGTON, D.C.
20555 March 10, 1988 NRC RULLETIN NO. 88-03:
INADEQUATE LATCH ENGAGEMENT IN HFA TYPE LATCHING RELAYS MANUFACTURED BY GENERAL ELECTRIC (GE) COMPANY Addressees:
All holders of operating licenses or construction permits for nuclear power reactors.
Purpose:
The purpose of this bulletin is to request that licensees perfonn inspections to ensure that all GE latching-type HFA relays installed in Class IE (safety-related) applications have adequate latch engagement and that those relays which fail to meet acceptance criteria be repaired or replaced.
Description of Circumstances:
GE Meter and Control Business Department (MCBD) investigated a report dated October 7,1987 from their Nuclear Energy Business Operation that certain latch-type relays supplied by GE with Certificates of Conformance, qualifying them to the requirements of IEEE-3?3, "IEEE Standard for Qualifying Class IE Equipment for Nuclear Power Generating Stations," which includes IEEE-344, "IEEE Recomended Practices for Seismic Qualification of Class 1E Equipnent for Nuclear Power Generating Stations," were malfunctioning. MCBD infomad the NRC of this problem in accordance with 10 CFR Part 21 on November 12, 1987 (at-tached) and sent a letter dated November 16, 1987 to all purchasers of HFA 1518,1548, and 154E type latching relays who had specified Class 1E or equiva-4 lent on their purchase order.
Although GE reported that they have infonned all their customers who purchased the relays as Class IE components, there may be "Other Equipment Manufacturers" who purchased these relays as consnercial grade j
components and then installed them in panels and certified them as Class 1E components on the basis of analysis. GE MCBD has halted production of these relays pending resolution of this problem.
The NRC believes that the operability of all HFA 1518. HFA 1548 and HFA 154E relays with a manufacturing date code prior to November,1987 has been brought into question and therefore the relays should be inspected. Also, the following
- COUJU4Vuoc w.
NRCB 88-03 March 10, 1988 Page 2 of 4 additional latching-type HFA relays which were not oualified to IEEE-3?3 by GE, but which may have been qualified and used by "Other Equipment Manufacturers" in Class IE, Isafety-related) applications may also be suspect:
Non-Century Series Century Series Types HFA 54 HFA 154 HFA 74 FFA 174 HFA 51B HFA 151B HFA 718 HFA 171B In GE latching-type HFA relays, when the coil is energized, the armature operates a latch which locks in the change in the state of the contacts and holds them in that state once the relay is de-energized until such time that the relay is mechanically or electrically reset. GE MCRD determined that when the relay is energized, with the armature in the latched position, each leg of the U-shaped latch should engage the top of the amature by the required minimum of 1/32 inch. With less than 1/3? inch latch engagement, it is possi-ble that the relay could unlatch prematurely. GE MCBD concluded that two circumstances can cause latch engacement to be less than 1/3? inch:
(1) Insufficient clearance between the top of the relay amature and the top of the moving contact carrier and, (2) Insufficient tension provided by the fomed leaf spring that rotates the latch to its fully engaged position, which may pemit the spring to relax before full engagemnt between the latch and the annature is achieved.
Actions Requested:
Addressees should complete the actions described below for all latchino-type HFA relays in Class IE (safety-related) applications no later than restart following the next refueling outage scheduled to begin 30 days or more from receipt of this bulletin.
l 1)
In accordance with the GE recorsnendation contained in Attachment 1 measure the distance between the top of the molded contact carrier and the j
top of the relay amature.
This distance should be a minimum of 1/32 i
j inch.
i 2)
In accordance with the GE reconnendation contained in Attachment 1, with the armature fully depressed acainst the pole piece, check to see if the
]
latch is fully rotated by pulling up on the latch assembly.
If the latch is fully rotated, there should be no motion of the latch, since the latch should be held against the armature by spring tension.
J 1
NRCB 88-03 March 10, 1988 Page 3 of 4 3)
Repair or replace any relay which fails the above inspections, such that the relay satisfies the GE criteria.
4)
Inspect all existing spare HFA relays as above.
Future spares received should be inspected prior to their installation if manufactured prior to November 1, 1987 Reporting Requirements:
Records of inspection and corrective actions in response to this bulletin shall be documented and maintained in accordance with piant procedures for Class 1E equipment. Any addressee who does not have HFA type latching relays subject to this bulletin shall provide A_latter to_the NRC stating _this fact within 170 days of receipt _of_this buDetin. Addressees wTso dolave ffFX type TitlihW relays subject to this bulletin including those who have previously responded to the GE SAL shall.p_rotideJetters of confirmation _af_ completion _of_the_in-s m tions. These letters shall include the number of relays of each type Tnspected, the number of relays of each type requiring corrective actions due to item 1 under hettons Requested, and the number of relays of each type j
requiring corrective actions due to item 2 under Actions Requested. These letters of confirmation shall be submitted to the NRC within 30 days of com-pletion of the inspfctions.
The letter of confirmation shall be submitted to the appropriate Regional Administrator unt:er oath or affinnetion under the provisions of Section 182a, Atomic Energy Act of 1954, as amended, including the provisions of 10 CFR 50.54(f).
In addition, the original copy of the cover letter and a copy of any attachment shall be transmitted to the U. S. Nuclear Regulatory Connission, Document Control Desk Washington 0.C.
20555, for reproduction and distri-bution.
This request for information was approved by the Office of Management and Budget under blanket clearance number 31500011.
Coment on burden and duplica-tion should be directed to the Office of Management and Budget. Reports Manage-ment, Room 3208, New Executive Office Building, Washington, D.C., 20503 Although nc specific request or requirement is intended, the following infoma-tion would be helpful to the NRC in evaluating the cost of implementing this bulletin:
1.
Staff time to perform the requested inspections and corrective actions.
2.
Staff time to prepare the requested documentation.
3.
Additional cost incurred as a result of the inspection findings (e.g.,
costs of corrective actions, costs of downtime),
i
NRCB 88-03 March 10, 1988 l
Pace 4 of 4 If you have any questions about this matter, please contact one of the techni-cal contacts listed below or the Recional Administrator of the appropriate regional office.
Y
{ h-S Charles ossi, Director Division of Operational Events Assessment Office of Nuclear Reactor Re9ulation 1
i Technical Contacts:
K. R. Naidu, NRR (301) 497-9659 E. T. Baker, NRR
)
(301) 492-4783 Attachments:
1.
GE letter dated November 12, 1987 2.
List of Recently Issued NRC Bulletins i
GENER AL $ ELECTRIC PcNVER sysiEMs MANAGl>AINT BuslNt$s D(PARTMENT GENElWL ttECTtic COMPANY
- 90$ GREAT VALLEY PARXWAY e AWLVEAN, PENN$YLMNA 193554715 * ($15) 9517000 November 12. 1987 Mr. James Taylor Of ractor of Office of Inspection & Enforcement t
United States Nuclear Regulatory Comission Washington OC 20555
Subject:
Type HFA relay with latching mechanisms.
Dear Mr. Taylor:
This letter is to notify you of a reportable condition under 10CFR21 related to certain types of HFA auxiliary relays manufactured by our department. Three models qualified by our department to IEEE-323 are affected. They are: HFA1518. HFA1548 and HFA154E.
We classified this as a reportable condition after an investigation into a report of insuffletent latch engagement provided to us by GE's Nuclear Energy Business Operation on Oct. 7,1987.
The attached service advice letter is being sent to all purchasers of these relay models who specified "Nuclear IE" or equivalent on the order. The attachment explains the nature of a possible defect. Users must determine from their application of the relay if a safety hazard could be created by such defect.
Production has been stopped in our factory and will resume after we insure additional contact carrier clearance and adequate leaf spring tension.
All relays having a date code prior to November 1987 should be checked per the attached procedure to determine if the latch mechanism is adequately engaging.
Sincerely yours,
./
V f' b,,
j}df/*
- j
. E. Teague, Manager, Engineering Attachment
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4 GENERAL $ ELECTRIC METtA AND cC$4tCt. SUsNEs$ D(PNtTMD4 clNCRAL EttCTtC cCMMY e CALL 8Cm 15
Subject:
HFA RELAYS WITH LATCHING MECHANISMS Wumber 190.1
!ssued by:
R. R. Hamer November 16, 1987 Prepared by:
S. S. Duerwachter NON-CENTURY SERIES CENTURY SERIES TYPES: HFA54 TYPES: HFA154 HFA74 HFA174 HFA51B HFA1518 HFA71B HFA1718 One user of latching-type HFA Relays has reported finding several Relays on which the latch engagement was less than the recomended minimum.
With the amature in the latched position, each leg of the U-shaped latch should engage the top of the amature by at least 1/32 inch.
There is a possibility that with less than the recomendtd minimum latch engagement, the relay could unlatch incorrectly.
Our investigation into this report has led es to c6nclude that latch engagement of less than 1/32 inch may be caused by two circumstances.
If there is insufficient clearance between the top of the relay armature and the top of the molded moving contact carrier, it could prevent the mechanical latch from reaching the minimum 1/32 inch engagement. The second reason could be insuf fic ient tension by the formed leaf spring that rotates the latch to its fully engaged position.
If this leaf spring does not have proper tension, there is a possibility that the spring will relax before full engagement between the latch and armature is achieved.
In order to confirm proper engagement of the mechanical latch, the following procedures may be followed:
A.)
CONTACT CARRIER CLEARANCE 1.
Measure the distance between the top of the molded contact carrier and the top of the relay amature.
This distance should be a minimum of 1/32 inch.
R.)
!NSUFFICIENT LEAF SPRING TENSION 1
With the armature fully depressed against the Pole Piece, check to see if the Latch is fully rotated by pulling up on the latch assembly.
If the latch is fully rotated, there should be no motion of the latch, since the latch should be held against the armature by spring tension.
l e
If the above condttions are not met, we recomend the following:
FOR STANDARD CO M ERCIAL GRADE APPLICATIONS.
a.
If there is insufficient clearance between the top of the molded moving contact support and the top of the amature a small portion of the molded support can be removed by fi1Ing. This can be done as follows:
I 1
Remove the armature assembly from the relay.
{
2.
Disassemble armature assembly, maintaining the proper i
orientation of contact springs and moving contacts.
3.
File approximate?y 1/16 inch from the top of the contact carrier.
4 Reassemble armature assembly, maintaining original
{
orientation of contact springs and moving contacts, and i
recheck for at least 1/32 inch clearance, as mention in (A1).
5.
Replace amature assembly in Relay.
b.
If full latch rotation is not present:
1 Remove latch assembly by removing the 10-32 screw at the top of the latch assembly.
2.
Re-form leaf latch spring to have less curve (flatter spring).
3.
Reassemble latch assembly and check for full rotation.
4 If relay is electric reset, check to ensure that relay resets with 60% of rated voltage applied to the reset coil circuit.
FOR Nil
- LEAR !E APPLICATIONS For Latching-Type HFA relays originally certified for IE applications, a replacement relay is reconended.
Replacement rela be your local GE district sales office. ys should ordered through Relays ordered 4
before December 1,1988, will be furnished at 60% of the pubitshed handbook price. Requests for replacement HFA's must include:
A.
A reference to Service Advice No.190.1.
8.
Requisition number and purchase order under which the original relay was furnished and the conplete relay catalog
- number, j
C.
CFR serial number which is on each IE Relay, D.
Nuclear Damage Waiver.
Latching-type HFA relays manufactured November 1,1987 or later (date code YB) will be atusted and checked at the factory for the above eon 11tions.
Labor for the above procedures is the responsibility of the purchaser.
MRVICC:!Nr0LTRS CP:dpr i
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i NRCB 88-03 March 10,1988 LIST OF RECENTLY ISSUED NRC BULLETINS Bulletin Date or
~~
No.
Subject Issuance issued to 88-02 Rapidly Propagating Fatigue
?/5/88 All holders of Ols Cracks in Steam Generator or cps for W-designed Tubes nuclear power reactors with steam generators having carbon steel support plates.
88-01 Defects in Westinghouse 2/5/88 All holders of Ols Circuit Breakers or cps for nuclear power reactors.
87-02 Fastener Testing to 11/6/87 All holders of OLs Detemine Conforinance or cps for nuclear with Appitcable Material power reactors.
Specifications 87-01 Thinning of Pipe Walls in 7/9/07 All licensees for Nuclear Power Plants nuclear power plants bolding an OL or CP.
86-04 Defective Teletherapy Timer 10/29/86 All NRC licensees That May Not Terminate Dose authorized to use cobalt-60 teletherapy units.
4 86-03 Potential Failure of Multiple 10/8/86 All (acilities ECCS Pumps Due to Single holding an OL or Failure of Air-Operated Yalve i P.
in Minimum Flow Recirculation Line 1
i 86-02 Static "0" Ring Differential 7/18/86 All power reactor i
Pressure Switches facilities holding an OL or CP.
86-01 Minimum Flow logic Problems 5/23/86 All GE RWP facilities That Could Disable RHR Pumes holding an OL or CP.
85-03 Motor-0perated Yalve Cosmon 11/15/85 All power reactor Mode Failures During Plant facilities holding Transients Due to Improper an OL or CP.
Switch Settings OL = Operating License CP = Construction Pemit j
.