ML19352A073
| ML19352A073 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 12/01/1977 |
| From: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
| To: | Case E Office of Nuclear Reactor Regulation |
| References | |
| IEB-77-05, IEB-77-05A, IEB-77-5, NUDOCS 8103020777 | |
| Download: ML19352A073 (14) | |
Text
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Jersey Central Power & Light Company MADISON AVENUE AT PUNCH BOWL. ROAD
- MORRISTOWN, N.J.07960
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Edson G. Case, Acting Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555 NW#,
Dear Mr. Case:
Subject:
Oyster Creek Nuclear Generating Station Docket No. 50-219 Evaluation of Electrical Connector Assemblies Your letter of November 23, 1977, requested that we provide information to you by December 1,1977, on the environmental qualification of the electrical connector assemblies at the Oyster Creek Station. This information is to include responses to the questions of I 6 E Bulletin No. 77-05, dated November 8, 1977, and No.77-05A, dated November 15, 1977. An independent evaluation of the connectors in use at Oyster Creek has been performed and the results are presented below. Jersey Central concurs with these conclusions.
The Oyster Creek Station utili:es some connectors of the general type described in I 6 E Bulletin 77-05 on some components that are required to be operabic during an accident. Attachment I lists the components in the drywell that may be required to be operable during an accident that have these connectors. These connectors' identification numbers are also provided in Attachment I.
The contai:nen-isolation valves listed in Attachment I have redundant isolation valves outside the drywell, which would not be affected by an accident in the drywell. 'Ihe Electromatic Relief Valves, Isolation Condenser isolation valves, and Main Steam i
isolation valves were discussed with you during our meeting of November 23, 1977.
l The completion of our investigation found five other isolation valves utilizing l
the ITT-Cannon connectors.
An examination of equipment outside the drywell found that the ITT-Cannon connectors are used on the connector assemblies at the penetrations for the components listed in Attachment I, on components in the Control Room, and on a few components that are not required to function to mitigate accidents (i.e the Control Rod Drive Flow Control Valve and the Source and Intermediate Range Monitors on the 23 foot elevation). Since remote shutdown can be accomplished l
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. without the Ccntrol Room and since the components of Attachment I are for mitigation of LOCAs in the drywell or for containment isolation there is no equipment outside the drywell containing the ITT-Cannon connectors which is needed to mitigate an accident that could affect the connectors.
Wyle Laboratories has perfomed environmental qualification tests on connectors used with the Target Rock safety relief valves for the Target Rock Corporation. This test program is described in Wyle Laboratories Report No. 42921-1 and was referenced in the November 22, 1977, letter to Mr. D. Eisenhut of your staff from Mr. G. Sherwood of the General Electric Company. These tests demonstrate that these connectors can tolerate environ-mental conditions more severe than those expected at the Oyster Creek Station following any postulated Loss of Coolant Accident.
In all design features important to the protection of electrical conductors through these connectors from external environmental conditions, the connectors tested by Wyle Laboratories are identical to those installed at the Oyster Creek Station.
This is confimed by the independent design comparison conducted by MPR Associates, Incorporated of Washington, D. C. and their report is enclosed as Attachment II. Note that representatives of the Cannon Electric Division reviewed and concurred in the report.
Based on this evaluation and the results of oer previous review of the results of the 1970 Dresden 2 blowdowit event (reference Oyster Creek FDSAR Amendment No. 62), we have concluded that connectors which can be considered prototypical of the connectors installed at Oyster Creek have been adequately tested and qualified. These tests and qualifications provide more than reasonable assurance that these connectors will not cause malfunctioning or reduced performance of safety equipment when needed in response to accident conditions. Therefore continued operation does not present any undue risks to the public's health and safety. Furthermore, we do not believe further testing is required because of these tests and qualifications.
Very truly yours, Ofl l
Ivan R. Finfr k,
r.
Vice Fresident la l
SAf ETY REllslED COMPOlEllIS US!flG IIT CANfl0N C0ftflECTORS FOR PRIMARY C0flTAlltf1ErlT PErlETRATI0ff SERVICE ITT CANfl0ft C0ftflECTORS Inside Drywell Outside Drywell Occtromatic Relief Valves Three(3)
CA3106E 36A-46P-F80 CA3106E 36A-46P-F80 CA3100R 36A 46S-F80 CA3100E 36A-465-F80 Two (2)
CA06RX 36A-10E A95 CA06RX 36A-10P-A95 CA3100RX36A-10S-A95 CA00RX 36A-10S-A95 ausstien Condenser Valves Inside CA3106E.36A-46P-F80 CA3106E 36A-46P-F80 Drywell (2)
CA3100R 36A-465-F80 CA3100E 36A-46S-F80 41n Steam Isolation Valves Inside CA3106E 36A-46P-F80 CA3106E 36A-46P-F80 Drywell (2)
CA3100R 36A-46S-f80 CA3100E 36A-465-F80 lther Containment Isolation Valves Inside Drywell CA3106E 36A-46P-F80 CA3106E 36A-46P-F80 (5)
CA3100R 36A-465-F80 CA3100E 36A-46S-F80 r.
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M PR AOSOCIATE2, INC.
December 1,1977 TRIP REPORT Date November 29, 1977 Place Cannon Electric Division ITT 666 East Dyer Road Santa Ana, California Persons Contacted Michael G. Lane, ITT Darrel Stalder, ITT Persons Makina Trip Philip Moore, Generation Engineering, JCP&L Thomas H. Fink, MPR Associates, Inc.
Purpose of Trip To Review Design Differences Between Cannon Electrical Connectors Installed at the Oyster Creek Nuclear Generating Station and the Type of Connectors Tested by Wyle Laboratories as Reported in Reference 1.
References 1)
Wyle Test Report, Number 4292-1 2)
Military Specification, MIL-C-5015D I.
Summary and Conclusions Reference 1) indicates that two electrical connector sets were used in the testing program conducted by Wyle; one connector set was designed to the requirements of military specification MIL-C-50150 and one was a commercial design.
In discussions with personnel at Cannon, the type of connector sets referenced in the Wyle test program were com-pared to the Cannon connector sets installed at the Oyster Creek sta-tion to identify differences in design, materials of construction, and i
manufacturing tolerances. Component parts of typical military and com-mercial Cannon connectors were also examined to ascertain the specific construction and assembly features which could possibly affect their ade-quacy in adverse environments.
Based on these discussions and examina-l tions, it is concluded that the connectors installed at Oyster Creek are of similar design to the type of connector used in the Wyle test program 1
r and that the Oyster Creek Cannon connector sets wuld be expected to cxhibit behavior similar to the connectors used in that test program.
Minor differences in design are discussed in detail in Section IIB of this report.
II. Detailed Discussion A.
Wyle Test Connectors Reference 1) indicates that two connector sets were used in the Wyle test program. These connectors are identified in the refer-enced Wyle test report as part numbers:
MS3102-R-10SL-3P(Receptacle)
MS 3106-R-10SL-35 (Plug)
CA3102-HR-10SL-3P-650(Receptacle)
CA 3106-HR-10SL-35-650 (Plug)
The MS designation represents a connection set designed in con-formance with Military Specificatien MIL-C-5015D. The CA desig-nation represents a commercial design and serves to identify the specific vendor, Cannon Electric Division.
The comercial Cannon connector set used in the Wyle test consists of a connector with a high temperature-resistant ceramic-type in-sulator. Installed connectors at Oyster Creek do not contain this type of insulator. Hence the cietail design of this connector set was not reviewed with Cannon Serconnel. The military version, however, was considered by Cannon personnel to be similar to the Oyster Creek connectors. Accordingly, the design of the connector set was reviewed'in detail with Cannon personnel. Design features of the Cannon MS receptacle and plug are as follows:
1.
Receptacle The receptacle half of the connector set consists of three 2
components; a shell, an insulator, and contacts. The insula-tor is bonded to both the shell and contacts. This seals the back of the receptacle (i.e., the side of the receptacle to which the wire is terminated) and each MS receptacle is 100%
tested to withstand a pressure of 30 psig. Cannon personnel stressed that this bonding is designed to provide an aircraft pressurized bulkhead seal only and that this seal has no effect on maintaining the electrical integrity of the Cannon connector set under adverse environmental conditions.
The shell is constructed of cadmium-plated aluminum alloy.
The insulator material consists of a 70- to 80-Shore poly-chloroprene while the contacts are silver-plated machined brass pieces.
(Note:
the Shore rating test is defined by ASTMD-2240.)
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coug FIGURE 1 TYPICAL CANNON CONNECTOR COMPONENTS 2.
Plug The plug half of the connector set consists of eight com-l l
ponents (refer to Figure 1 above):
Cadmium-plated aluminum endbell Nylon ferrule 40-Shore polychloroprene grommet Silver-plated machined brass contacts 70- to 80-Shore polychloroprene insulator l
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Cadmium-plated coupling nut Cadmium-plated barrel 70-Shore neoprene 0-ring The insulator in the plug is bonded to the barrel but not to the individual contacts as in the receptacle. Hence, the bond in the plug is only to effect a method of holding the insula-tor in place. The cable end of the plug is sealed by the com-pression of the gromet. The gromet is compressed radially by the ferrule as the endbell is tightened onto the barrel.
The ferrule also provides an axial (i.e., along the axis of the barrel) compression force which seals the gromet to the insulator at this interface.
The contact faces of the plug and the receptacles are sealed by three sealing devices. A peripheral seal is achieved by the 0-ring which is compressed by the barrel as the coupling nut is tightened. The second seal is effected by the contact pressure between the two resilient insulator faces. The third seal which is formed on the mating surfaces is the seal created around the individual pins due to " doughnuts" molded in the insulator of the plug around each pin. The doughnuts seat around each pin hole in the receptacle.
These individual seals are formed as the coupling nut is tightened, forcing the insulators in the receptacle end and the plug end together. Cannon was questioned as to the function of the 0-ring seal. They stated that there is a military specifica-tion requirement that different manufacturers' connector ccm-ponents must be interchangeable. Since interfacial sealing may not be achieved between plugs and receptacles made by l l
different manufacturers, the peripheral 0-ring seal was in-corporated. For connector sets made by the same manufacturer, as is the case at Oyster Creek, this peripheral 0-ring is re-dundant.
Finally, Cannon noted that this seal design is the same regardless of tile number or arrangement of the contacts provided in the specific connector set design.
B.
Oyster Creek Cannon Plua Desians The following Cannon connector sets have been identified by JCP&L as being installed in systems which are required to operate follow-ing a LOCA.
1.
CA-3100E-36A-465-F80(Receptacle)
CA-3106E-36A-46P-F80 (Plug) 2.
CA-3100R-36A-46S-F80 (Receptacle)
CA-3106E-36A-46P-F80 (Plug) 3.
CA-3100 RX-36-10S-A95 (Receptacle)
CA-06 RX-36-10P-A95 (Plug)
Design fe uures of these connector sets are as follows:
1.
Connector Set 1 a.
Receptacle (CA-3100E-36A-465-F80)
The design and materials of construction of the recep-tacle half of the connector are the same as those des-cribed above with the following exceptions.
In the commercial design the contacts are gold plated and are designed for a crimped-type of termination while in the MS design the contacts are silver plated and are designed i
for solder terminations. Due to this crimp termination the contacts are inserted into the insulator and hence, unlike the MS design, the contacts are not bonded to the insulator. The type of termination and contact plating does not have any effect on the moisture seal.
To provide a moisture seal on the cable side of the re-ceptacle, the same endbell, ferrule, and gromet design -
8 6
9 and materials as described above for the military plug are provided in the comm:rcial design. Thus, the fact that the pin contacts are not bonded in the receptacle half of the commercial connector is not significant since the cable end seal is achieved by the radial and axial compression of the grommet in the same manner as the plug half of the MS series connectors.
An additional feature of the miliary connector specified in Reference 1) is that the contacts and their connec-tion to the conductors are exposed while in the crimped-type design installed at Oyster Creek the contact pins and insulated conductors are inserted into the insulator and are sealed by compression of the grommet.
This feature of the commercial receptacle design appears to be superior to the military design insofar as mois-ture resistance is concerned.
b.
Plug (CA-3106E-36A-46P-F80)
This plug is designed using identical parts and materials as described above for the MS design with the exception that the contacts are gold plated. Mcwever, this plug does not contain the redundant peripheral 0-ring seal provided in the MS design. The contact face seal is achieved by the mating of the 70- to 80-Shore insulator faces on the plug and receptacle and the doughnut seals around each pin. As noted above, these seals are the primary seals which prevent entry of moisture into the contact face area and pins.
In the plug end of the Oyster Creek connectors, the con-du~ctors are also crimped to the contacts as compared to solder joints in the MS connectors. However, the con-tact retention system in both the military and commercial designs are identical. Thus the moisture-proof integrity of the MS assembly from the cable end is identical to that of the connector used at Oyster Creek.
2.
Connector Set 2 a.
Receptacle (CA-3100R-36A-465-F80)
This receptacle is identical in design and materials as the receptacle described under Connector Set I above. The only exception is that the endbell does not contain an integral cable clamp. The cable clamp has no effect on the moisture-resistant capabilities of the connector as l
it is not a portion of the moisture seal design.
1 1
b.
Plug (CA-3106E-36A-46P-F80)
This plug is of identical design and materials as des-cribed above under Connector Set 1.
3.
Connector Set 3 a.
Receptacle (CA-3100RX-36-105-A95)
Outside of minor dimensional differences in the berrel and insulator interfaces, and gold plating of the con-tacts, this receptacle is essentially identical to the design and materials in Connector Set I with the ex-ception that the grommet is bonded to the insulator.
According to Cannon, the bonding of the grammet was incorporated into the Cannon line for ease of assembly and none of these differences have any effect on the moisture retention properties of the Cannon connector.
As in all Cannon designs, the gron=et is 40-Shore polychloroprene while the insulator is 70- to 80-Shore polychloroprene.
b.
Plug (CA-06-RX-36-10P-A95)
This plug is the same a icribed in Connector Set 2 with the exception that
- grommet is bonded to the insulator.
In addition an 0-ring seal is also provided identical to the MS design.
C.
Sumary Comoarison The main features of the Cannon MS series connectors and the concercial Cannon connectors used at Oyster Creek are summarized in the attached tables for comparison purposes. As shown in this table and discussed above, the connectors installed at Oyster Creek are of similar design to the type of connector used in the Wyle test program and that the Oyster Creek Cannon connector sets would be expected to exhibit behavior similar to the connectors used in that test program..
7his report was read to and concurred in by representatives of Cannon Electric Division.
'l Thomas H. Fink MPR Associates. Inc.
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