ML20080L491
| ML20080L491 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood, 05000000 |
| Issue date: | 09/22/1983 |
| From: | Barnes P COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| REF-SSINS-6820 7347N, IEB-77-07, IEB-77-7, NUDOCS 8309300336 | |
| Download: ML20080L491 (6) | |
Text
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O) one First Nationai Plaza, Chicago, Illinois M
Commonwmith Edison C
G" Address Reply to: Post Office Box 767 Chicago Ulinois 60690 September 22, 1983 Mr. James G. Keppler, Regional Administrator
- Region III U.S. Nuclear Regulatory Commission i
799 Roosevelt Road Glen Ellyn, IL 60137
Subject:
Byron Station Units 1 and 2 Braidwood Station Units 1 and 2 Correction to Supplemental Response to IE Bulletin No. 77-07 NRC Docket No. 50-454/455 and 50-456/457 i
Reference (a):
P.
L. Barnes to J.
G. Keppler letter dated September 7, 1983 (NL-83-0263)
Dear Mr. Keppler:
Reference (a) provided a supplemental response to IE Bulletin No. 77-07 for our Byron and Braidwood Stations.
It has come to our attention that an error was made in that response.
The Attachment to Reference (a) stated that "... (a) all of i
the Byron /Braidwood Unit 1 and some of the Unit 2 penetrations are manufactured by Bunker Ramo...".
This is in error.
It should state
" manufactured by Conax".
A corrected Attachment is provided.
Please address any questions that you or your staff may have to this office.
1 Respectfully, bW P.
L. Barnes Nuclear Licensing Administrator Attachment i
cc:
USNRC Document Control Desk RIII Inspectors - BY/BW 7347N
-E ll 8309300336 830922
{DRADOCK05000jj SEP 2 31983
Attachment Byron Units 1 and 2 and Braidwood Units 1 and 2 Supplemental Response to IE Bulletin No. 77-07 There has been a number of design changes in the installation of the electrical penetrations since our response to I.E.Bulletin 77-07 on January 20, 1978.
Our response identified the Bunker Ramo electrical penetrations as the only type being used at Byron and Braidwood Stations.
However the present design includes a large number of electrical penetrations supplied by Conax Corporation.
Attachment "A"
to this letter is a complete list of the electrical penetration assemblies at Byron /Braidwood Stations.
You will note that (a) all of the Byron /Braidwood Unit 1 and some of the Unit 2 penetrations are manufactured by Conax and (b) a large number of the Unit 2 Bunker Ramo low voltage penetration modules are being replaced with Conax Adapter Modules.
We have reviewed the Bulletin and our response and provide the following supplemental response:
1.0 The Byron /Braidwood penetrations manufactured by Bunker Ramo are similar in that they depend upon a glass epoxy sealant and a dry nitrogen pressure environment to ensure that the electrical and pressure characteristics are maintained so as to ensure the functional capability as required by the Plant's Safety Analysis Report; namely, (1) to insure adequate functioning of electrical safety-related equipment and (2) to ensure containment leak tightness.
The model (type) is identified by the manufacturer as a Unitized Header Assembly.
The Byron /Braidwood penetrations manufactured by Conax (including the Adapter Modules) do not utilize an epoxy insulation system.
The Conax penetration design utilizes solid copper conductors which pass through the assembly without any internal splices.
The conductors are continuously insulated l
with a polyimide (kapton) film and mechanically sealed at both ends of the stainless steel tube (module) using thermoplastic (polysulfane) sealants.
The modules are then mechanically sealed within the penetration's header plate.
The model (type) is identified by the manufacturer as "The Penetration within a Penetration."
l The Conax penetrations are designed with the provision of periodically monitoring the condition of all seals by internally pressurizing the assembly with nitrogen gas.
However, the nitrogen gas does not contribute to the electrical function of these penetrations.
. 1.1 See Item 1.0 above.
1.2 The Bunker Ramo penetration transition connector pins imbedded in the epoxy, as discussed in Item 1.0 above, do not have an insulation jacket.
The glass epoxy sealing material provides pin to pin insulation.
This question is not applicable to the Conax penetrations.
See Item 1.0 above.
2.0 The dry nitrogen pressure, specified in Bunker Ramo's Instruction manual, has been maintained at all times during shipping, stnrage and installation of the electrical penetrations.
The Conax penetrations do not depend upon a dry nitrogen pressure environment to ensure that the electrical characteristics are maintained.
(See Item 1.0 above.)
3.0 There is a need to maintain the Bunker Ramo penetrations pr ssurized during normal operation to assure electrical functionability during a LOCA.
There is no need to maintain the Conax penetrations pressurized during normal operation to assure electrical functionability during a LOCA.
3.1 The functional requirements and the reference documents listed in the penetration procurement specifications identify the design reviews, analyses and tests required to ensure that the penetrations will perform their design function under LOCA conditions.
The following is a partial list of the documents referenced in the procurement specification:
IEEE-317 -
Standard for Electrical Penetration Assemblies in Containment Structures for Nuclear Power Generating Stations (1972).
IEEE-323 -
Standard for Qualifying Class lE Electrical Equipment for Nuclear Power Generating Stations (1974).
IEEE-344 -
Guide for Seismic Qualification of Class 1 Electrical Equipment for Nuclear Power Generating Stations (1971).
. IEEE-383 - Standard for Type Test of Class 1E Electric Cables, Field Splices and Connections for Nuclear Power Generating Stations (1974).
ASME -
Boiler and Pressure Vessel code,Section III, Subsection NE for Class MC Components.
ANSI -
Quality Assurance Program Requirements for N-45-2 Nuclear Power Plants.
ANSI -
Installation, Inspection and Testing for N-45.2.4 Instrumentation of Electrical Equipment during the Construction of the Nuclear Power Generating Plants (IEEE-336).
3.2 The measures that provide this assurance (Item 3.1 above) are adequate to satisfy the Commission's regulations (General Design Criteria 4 - Appendix A to 10CFR50 and Quality Assurance Criteria - Appendix B to 10CFR50).
7253N l
j
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ATTACHMENT "A"
LIST OF ELECTRICAL PENETRATION ASSEMBLIES AT BYRON /BRAIDWOOD STATIONS S&L Spec.'It'm'No.
" Byron /Braidwood Unit 1 Byron /Braidwood Unit 2 e
Equipment No.
Equipment No.
Item 1 1RC01E*
2RC01E**
1RCO2E*
2RC02E**
1RCO3E*
2RC03E**
1RC04E*
2RC04E**
Item 2 lVP01E*
2VP01E**
IVP02E*
2VP02E**
IVP03E*
2VP03E**
IVPO4E 2VP04E**
Item 3 1AP84EA*
2AP84EA**
1AP84EB*
2AP84EB**
1AP84EC*
2AP84EC**
Item 4 1RYO4E*
2RYO4E***
1RY05E*
2RY05E***
1RYO6E*
2RYO6E***
1RYO7E*
2RYO7E***
Item 5 1RD12E*
2RD12E***
(
1RD13E*
2RD13E***
1RD15E*
2RD15E***
1RD16E*
2RD16E***
1RDl7E*
2RD17E***
Item 6 ISIOlE*
2SIOlE***
1SIO2E*
2SIO2E***
Item 7 1AP85EA*
2AP85EA***
1AP85EB*
2AP85EB***
1AP85EC*
2AP85EC***
' LAP 85ED*
2AP85ED***
/
Item 8a ISIO3E*
2SIO3E**;
ISIO4E*
2SIO4E**
Item 8b lLV01E*
2LV01E**
ILV02E*
2LV02E**
I e
lLV03E*
2LV03E**
{
lLV04E*
2LV04E**
Item 9a ISIOSE*
2SIO5E**
1SIO6E*
2SIO6E**
1SIO7E*
2SIO7E**
1SIO8E*
2SIO8E**
i Item 9b ILVOSE*
2LV05E**
lLV06E*
2LV06E**
s 's Byron /Braidwood Unit 1
, Byron /Braidwood ~ Unit 2
,, S&L_ Spec. Item No.
Equipment No.
Equipment No.
Item 9c lLV07E*
2LV07E**'
ILV08E*
2LV08E**
~
. Item 9d ILV09E*
2LV09E*
lLV10E*
2LV10E*
Item 10 lNR0lE*
2NR0lE**
lNR02E*
2NR02E**
1NR03E* '
2NR03E**
1NR04E*
2NR04E**
lIC19E*
2IC19E**
Item 12 1CQOlE*
2CQOlE**
1CQO2E*
2CQ02E**
- - Manufactured by Conax
- - Manufactured by Bunker Ramo
- - Bunker Ramo Penetration with Conax Adapter Modules M
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