ML20076K056
| ML20076K056 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood, 05000000 |
| Issue date: | 09/07/1983 |
| From: | Barnes P COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| REF-SSINS-6820 7253N, IEB-77-07, IEB-77-7, NUDOCS 8309130016 | |
| Download: ML20076K056 (7) | |
Text
Commrnwrith Edison E
One First National Plaza. Chicago. Illinois O
Address Reply to: Post Office Box 767 Chicago Illinois 60690 September 7, 1983 Mr. James G. Keppler, Regional Administrator
- Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137
Subject:
Byron Station Units 1 and 2 Braidwood Station Units 1 and 2 Supplemental Response to IE Bulletin No. 77-07 NRC Docket Nos. 50-454/455 and 50-456/457 References (a):
IE Bulletin No. 77 J.
G. Keppler letter to B. Lee, Jr. dated December 19, 1977 (b):
O. E. O'Brien letter to J.
G. Keppler dated January 20, 1978
Dear Mr. Keppler:
Reference (a) requested that the Commonwealth Edison Company provide a written report regarding containment electrical penetration assemblies.
Reference (b) provided that response.
Our review of this response indicated that a supplemental response was necessary to accommodate design changes implemented since early 1978.
The Attachment to this letter provides the results of our review, and where applicable provides a discussion of the requisite actions taken.
Changes to the FSAR will be made as necessary.
To the best of my knowledge and belief the statements contained in the Attachment are true and correct.
In some respects these statements are not based on my personal knowledge but upon information furnished by other Commonwealth Edison employees, consultants and contractors.
Such information has been reviewed in accordance with Company practice and I believe it to be reliable.
Please address any questions that you or your staff may have concerning our supplemental response to IE Bulletin No. 77-07 to this of fice.
g Ell l i 9 1383(
%30%3coVo
i !
One (1) signed original with Attachment is being sent directly to the USNRC Document Control Desk in Washington, DC for reproduction and distribution.
4 Respectfully, P.
L. Barnes Nuclear Licensing Administrator Attachment i
cc:
US NRC, Document Control Desk l
Washington, DC l
RIII Inspectors - BY/BW i
SUBSCRIBED and SWORN to before me this % day of dtA#A 1983 l
A.
rA/23 i
Notary Public s
6 7253N a
,.v
- - - ~, -
-,.,-,.--.-,..,.7,,
,,,n n-.,-_,,g,e.,-,
e,,-.-,,a._, _.,..avnn.n._--_.e.e,--n_
Attachment Byron Units 1 and 2 and l
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, i
Our response identified the Bunker Ramo electrical penetrations as the only type being used at Byron and Braidwood j
Stations.
However the present design includes a large number of j
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 Bunker Ramo 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:
l.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 with a polyimide (kapton) film and mechanically sealed at both ends of the stainless steel tube (module) using thermoplastic j
(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."
The Conax penetrations are designed with the provision of i
periodically monitoring the conditf on of all seals by internally pressurizing the assembly with nitri. gen gas.
However, the nitrogen gas does not contribute to the electrical function of
(
these penetrations.
-m,
--__..~.._r-._,,
. 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 Rama's Instruction manual, has been maintained at all times during shipping, storage 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 pressurized 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 lE 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
e O
o.
'o ATTACHMENT "A" LIST OF ELECTRICAL PENETRATION ASSEMBLIES AT BYRON /BRAIDWOOD STATIONS Byron /Braidwood Unit 1 Byron /Braidwood Unit 2 S&L Spec.'ItemINo.
Equipment No.
Equipment No.
Item 1 1RC01E*
2RC01E**
1RCO2E*
2RCO2E**
1RC03E*
2RC03E**
1RC04E*
2RC04E**
Item 2 lVP01E*
2VP01E**
IVP02E*
2VP02E**
IVP03E*
2VP03E**
IVP04E 2VP04E**
Item 3 1AP84EA*
2AP84EA**
1AP84EB*
2AP84EB**
1AP84EC*
2AP84EC**
Item 4 1RYO4E*
2RYO4E***
1RYO5E*
2RY05E***
1RYO6E*
2RYO6E***
1RYO7E*
2RYO7E***
Item 5 1RD12E*
2RD12E***
1RD13E*
2RD13E***
1RD15E*
2RD15E***
1RDl6E*
2RD16E***
1RD17E*
2RD17E***
Item 6 1SIOlE*
2SIOlE***
1SIO2E*
2SIO2E***
Item 7 1AP85EA*
2AP85EA***
1AP85EB*
2AP85EB***
1AP85EC*
2AP85EC***
' LAP 85ED*
2AP85ED***
/
Item 8a ISIO3E*
2SIO3E**1 ISIO4E*
2SIO4E**
Item 8b lLV01E*
2LV01E**
lLV02E*
2LV02E**
lLV03E*
2LV03E**
r lLV04E*
2LV04E**
Item 9a 1SIOSE*
2SIO5E**
1SIO6E*
2SIO6E**
1SIO7E*
2SIO7E**
1SIO8E*
2SIO8E**
Item 9b lLVOSE*
2LV05E**
1LV06E*
2LV06E**
-wey
~.
3,.,
Byron /Braidwood Unit 1 Byron /Braidwood' Unit 2 S&L Spec. Item No.
Equipment No.
Equipment No.
Item 9c lLV07E*
2LV07E**
ILV,0 8E*
2LV08E**
Item 9d lLV09E*
2LV09E*
lLV10E*
2LV10E*
Item 10
.lNR0lE*
2NR01E**
1NR02E*
2NR02E**
1NR03E*
2NR03E**
1NR04E*
2NR04E**
IIC19E*
2IC19E**
Item 12 1CQOlE*
2CQOlE**
l ICQO2E*
2CQO2E**
Manufactured by Conax
- - Manufactured by Bunker Ramo
- - Bunker Ramo Penetration with Conax Adapter Modules
~
(
l f
e
.