ML20005G683
| ML20005G683 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley, Hatch, Monticello, Calvert Cliffs, Davis Besse, Peach Bottom, Palisades, Kewaunee, Harris, Oyster Creek, Grand Gulf, Cooper, Brunswick, Surry, Limerick, Vogtle, Robinson, Fort Calhoun, 05000000, Fort Saint Vrain, Shoreham |
| Issue date: | 01/05/1990 |
| From: | Utech T EGS CORP. INTERNATIONAL |
| To: | Varga S NRC |
| References | |
| REF-PT21-90, REF-PT21-90-009-000 PT21-90-009-000, PT21-90-9, NUDOCS 9001220152 | |
| Download: ML20005G683 (7) | |
Text
l 10- CFR 21 NOTIFICATION g
January 5,1990 l
U.S.! Nuclear Regulatory _ Commission One White-Flint, North
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- 11555~ Rockville Pike Rockville, Maryland' 20852--
. Attention: Mr. Steve Varga l
Subject:
10 CFR 21 NOTIFICATION: Grommet Use Range for F-Patel Conduit Seals, P/N 841206 The information contained in this notice is presented as directed by 10 CFR o
' 21,. Section ' 21.21(b)(3), i-viii.
i.
Individuals Infqrming the NRC and Utility Users:
-Iohnny _ Franklin Jenkins, President Gary Joseph Elam, Products Director iTerry H. Utech, Quality Assurance Director EGS Corp International.
H, 150 - West - Park Loop Suite 301 Huntsville, Alabama 35801
.205/722-8500 (phone) 205/722-8533 (fax) ii.
Identification of Facilitv/Comnonent:
Installation instructions, Patel Drawing A-N-841206-8, original L
issue through Rev. D, used for installation of the Patel Conduit Scal, P/N
- 841206, only specified a maximum conductor H.
diameter for selection of grommet seal.
The absence of an L
explicit minimum diameter requirement could lead to incorrect selection of, grommet seal.
- Op2gggg{g@go f
9 EGS Corporation a 150 West Park Loop a Suite 301 a Huntsville, Alabama 35806 = (205) 722 8500 a FAX (205) 722 b Knoxville Of4ce a 408 Cedar Bluff Road a Suite 230 a Knoxville, Tennessee 37923 a (615) 690-6200 a FAX (615) 690 5423
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U.- S.L Nuclear Regulatory Commission
[ January 5 5;~ 1990 Page Two; iii.
?ldentification of the Firm Sunnivine the Conduit Seal:
EGS, Corp -International
- 150 West Park Loop-l Suite 301:
Huntsville, AL 35806 205/722-8500 l
- On September 29, 1989, EGS purchased the product line and-j 7'
other assets of the Nuclear-Power Division of Patel Engineers.
')
iv.
Nature of Potential Defect j
1 The Patel Conduit Seal is a mechanical seal interface that is 1
used to seal existing conduit and field cable conductor or instrument lead wires.
Refer to Figure 1, : Patel Dwg. A-N-841206-8, Rev. F.
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On November 3,1989, H. B. Robinson, Unit No. 2 was in cold shutdown for work on the_ Auxiliary Feedwater System.
Concurrent with this work, research was being performed. in j
response to an NRC Inspector's questions regarding the qualification of cable entrance seals in Environmental
' Qualification (EQ) applications.
At approximately 1300 hours0.015 days <br />0.361 hours <br />0.00215 weeks <br />4.9465e-4 months <br />, it l
was identified-that a potential; deficiency existed with the wire use range associated with cable entrance conduit seal applications.
Specifically, it was found that the conductors passing through some of the grommets were undersized for the application.
Therefore, a potential moisture intrusion path was created between the conduit seal grommet and the wire and into the affected component.
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U.- SA Nuclear. Regulatory Commission
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- JanuaryL 5, 1990-.
Page Three i
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I The undersized wires represent an untested' configuration and therefore is a' condition' which may, or may-not, allow moisture l
y intrusion.
Experience with the Patel, Conduit Seal indicates that j
a 'slightly undersized wire will not degrade the sealing function.
For instance, Specimen P-1 in Patel Report PEI-TR-841203-12, r
Rev. A utilized a GR-16 grommet with undersized wires
(.005 inches below use range).
However, data is not available to determine how much undersized the insulation diameter must be before the seal becomes ineffectual.
Per CP&L LER 89-015-00, the cause of the wire use range deficiency in' the Patel Conduit Seals installed at H. B. Robinson
]
was the failure of Patel Engineers to supply adequate j
installation instructions.
A discussion of the installation instructions follows.
p The Patel Conduit Seal was originally -
supplied starting in L
- 1985, The installation instructions were supplied as Patel L
Drawing A-N-841206-8, Original Issue, which specified the j
following:
GROMMET MAXIMUM INSULATION DIAMETER (IN3 GR-12 '
.170 i
GR-14
.150 GR-16
.135 GR-18
.120 Implied within these specified maximum diameters is a use range for each grommet.
Revision E, 3/6/87, and Revision F, 11/10/87, of Patel Drawing A-N-841206-8 formally specified the use range as follows:
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. U. S. ' Nuclear Regulatory Commission
' January 5,.- 1990 Page Four e
NOMINAL USE RANGE:
GROMMET INSULATION DIAMETER (IN3
'G R~- 12
.150
.'170 GR-14 '
.135
.150 GR.115
.140 GR-18
.095
.115
' Utility customers that have only received Revisions E and/or F of Patel Installation Instruction Drawing A-N-841206-8 have received complete unambiguous _ wire use range instructions.
I Utility' customere trat have received Original Issue through Revision D
cou;d have potentially. misinterpreted the instructions.
A tubulation of utilities vs.
installation
~ instructions sent. with orders-is presented as Table 1.
. Preliminary feedback from an EGS telephone survey indicates that only 2 plants (Robinson and Brunswick), of the 20 plants where conduit seals have been used, misinterpreted the installation instructions.
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' U.S. _ Nuclear-_ Regulatory Commission
-January 5, 1990 -
Page' Five TABLE 1 Patel/EGS Conduit Seal-Customers Revisions of A-N-841203-8 Utility Plant Sent with Orders BG&E Calvert Cliffs Original, E, F CP&L Brunswick A,B,D,E,F CP&L Robinson B,D,E,F CP&L Harris-F GPU-Oyster Creek B, D NSP Monticello B,E,F NPPD Cooper B,D,F OPPD Ft. Calhoun B, D Duquesne Light Beaver Valley B,F Toledo Edison Davis Besse C, F PSC Ft. St. Vrain D,E,F VEPCO Surry D
PECO Peach Bottom D,E,F PECO Limerick E, F Consumers Power Palisades D,E,F
- WPS Kewaunee E, F LILCO Shoreham E, F Georgia Power Hatch F
Georgia Power Vogtle F
SERI Grand Gulf E
Weed Inst.
Surry F
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sU.S. Nuclear Regulatory Com nission
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January 5,1990 Page Six 1
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-o Lv.
Date of The Potential Defect
~I The in~ appropriate wire use range for 'certain conduit seal applications.was. identified at H. B. Robinson on November 3, 1989.
This : condition-was verbally reported to the NRC l
Inspector that was present.
CP&L immediately notified EGS j
personnel and provided formal notice to the NRC on November.
6, 1989.
Subsequently, EGS' evalbated the potential for a 10 CFR 21 l
notification.
On January 4,1990, EGS formally determined that a 10 CFR-21 notification is not clearly dictated, however, in the i
interest of conservatism, a 10 CFR 21 notification would be the proper action.
l vi._
' Utilities / Vendors Currentiv: Utilizine Patel Conduit Seals Refer to Table 1.
vii.
Corrective - Action The H. B. Robinson plant staff inspected all conduit seals in EQ
. applications for. proper wire use range.
Grommets were replaced.as necessary.
Plant procedures were revised to specify the appropriate wire use range for grommets.
In response to the events at H. B. Robinson, EGS prepared Product Bulletin 90-1: "Recent Events-Concerning Patel Conduit Seals, P/N 841206," dated November 7, 1989 (presented as ).
Copies of the product bulletin were sent to our utility customers both by way of facsimile and U.S. Mail.
Subsequently, Johnny Jenkins and Gary Elam followed up with personal telephone calls to each utility's EQ personnel.
Preliminary feedback from the users indicates only 2 plants (Robinson and Brunswick), of the 20 plants where conduit seals have been used, misinterpreted the installation instructions.
The product bulletin recommended that if there is reason to believe that grommet / wire use ranges are not consistent with the latest installation procedures, the utility's installation procedures and installed configurations should be
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Company
- January 5,- 1990
-Page Seven
-viii. EGS Recommendations
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.Orommet Use Range:
1
- All users should be aware of wire insulation diameter use ranges '. for. specific conduit seal grommets.
The insulation diameter of all wires to be sealed should be measured or otherwise verified prior -to the selection of the grommet size.
Braided material (such as Fiberglass) that is. utilized over insulated wires must 'be removed prior to installation of wires into the grommet.-
Measurements for. grommet sizing shall be taken on insulation without braiding.
The grommet part numbers (GR-12, GR-14, etc.) do not necessarily correspond with wire gauge, i.e.,-'a =16 AWG wire may require the use of a i
GR-18 grommet.
If there is reason to believe that use ranges l
are not consistent with our installation procedures, we j
recommend a review of the user's installation procerlures and j
installed. configurations.
If further help is required, consult i
with EGS Products personnel at 205/722-8500.
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- Document Upgrade =
EGS will review, upgrade as necessary, and distribute to our customers the latest revision of the -following documents:
- Patel Drawing A-N-841206-8, Conduit Seal Installation Instructions.
i Patel Report PEI-TR-841203-12, Final Qu'alification Report for Patel I
Conduit Seals.
Patel Procedure. PEI-TR-841211-02, Procedure for Installation and Removal of Patel Conduit Seals.
Completion Date:
July 2,1990 Su itted
/
Terr H.
ech Quality Assurance Director EGS Corp International
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