ML18037A184
| ML18037A184 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 06/11/1979 |
| From: | Schneider R NIAGARA MOHAWK POWER CORP. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML17053A854 | List: |
| References | |
| NUDOCS 7907300148 | |
| Download: ML18037A184 (24) | |
Text
7 NIAOARA 4
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NIAGARAMOHAWKPOWER CORPORATION/300 ERIE BOULEVARDWEST, SYRACUSE, N.Y. 13202/TELEPHONE (315) 474-1511 June ll, 1979 Mr. Boyce H. Grier Director U.. S. Nuclear Regulatory Commission Region 1
631 Park, Avenue King of Prussia, PA 19406
Dear Mr. Grier:
Re:
Docket No. 50-220 I'. E..Bulletin 79-01 Your February 8,
1979 I. E.Bulletin 79-01 addresses environmental qualification of electrical components.
The attached response discusses the environmental qualification of electrical equipment. which is required to operate to mitigate loss of coolant accidents.
The, response concludes that required electrical equipment inside containment's qualified for loss of coolant accident environments.
Niagara Mohawk is further investigating qualifications of safety-related electrical equipment outside containment.
The results of this investigation will be reported to the Nuclear Regulatory Commission by July ll, 1979.
That response will include, information to respond to I; E. Bulletin 79-01A dated June 6, 1979.
Very truly yours, NIAGARA MOHAWK POWER CORPORATION Vice President Electric Production Attachment cfSE @PE'Cfgf.
I F92.
Xc:
NRC Office of Inspection and Enforcement Washington, D.
C.
20555
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The following information is provided to respond to I.E.Bulletin 79-01.
Each item below corresponds'o the item-identifiec~n the u
etin.
Complete the re-review, program described in,I;E. Circular 78-08 within 1'20 days of receipt. of this Bulletin.
78-08-1 Niagara Mohawk responded on April 3,. 1978 to I.E.Bulletin 77-05 which discusses electrical connector equipment qualification.
Further information regarding the electrical. connectors was provided on March 7, 1979 and April 18, 1979.
A test was.performed at Franklin Institute to ensure that the connectors would operate during a postulated loss of cool-ant accident.
The connectors required to mitigate accidents satisfactorily passed the test.
The test results and test plan were submitted to the Nuclear'egulatory Commission'on April 3',
1978.
On November 28, 1977', Niagara Mohawk responded to I.E. Bulletin 77-05A which discusses electrical connector qualification outside containment.
Since the type of electrical connectors used outside containment are the same as those used inside, these. connectors are acceptable.
The environmental. conditions expected outside containment are less severe.
78-08-2 I.E.Bulletin 77-06 addressed equipment. qualification of General Electric Series 100 penetrations.
Our November 30, 1977 letter to the Nuclear Regulatory Commission stated that Nine Mile Point-Unit 1 does not uti'lize Series 100 penetxations.
Additionally, our penetration nozzles are carbon steel and welded to the containment liner.
A viton "0" ring is used to seal each penetration flange to the nozzle.
The flange is secured with bolts to the nozzle.
The penetration viton "0" rings, will accept the post loss of coolant accident-environment.
Viton "0" rings were qualified in a simulated loss of cool'ant accident performed for the" electrical connectors discussed in Item 78-08-1 above.
78-08-3 I.E.Bulletin 78-02 described unprotected terminal boards which were inadequate for post accident environmental conditions.
Our'eb.
6, 1978 letter indicated that Unit 1 does not utilize unprotected terminal boards inside containment.
Terminal boards are installed in NEMA Class 12 enclosures for the Main Steam Isolation Valves and the Electromatic Relief Valves.
An unprotected CR 151 terminal successfully passed a loss of coolant accident environment which is comparable to the Unit 1 conditions.
The results of the tests showed that the insulation resistance dropped, but remained at a sufficient. level to assure continued function of electrical equipment without circuit overload.
The construction of the EB-5 terminal boards in use at Nine Mile Point Unit 1 is equal to or better than the General Electric CR 151 terminal board.
.- The Unit 1 terminal blocks are located in'EMA 12 enclosures which provide additional protection.
There-fore, the EB-5 terminal boards are acceptable for the Unit 1 post loss of coolant accident environment.
I t t tl t
,It
78-08-4 Nine Mile Point, Unit 1 uses NAMCO limit switches (position switches SL3 C58 TW).
Our July 29, 1975 letter to the Nuclear Regulatory Commission discusses the environmental. qualification of similar limit switches.
The report indicates that the installed limit switches are capable of withstanding post accident environmental steam conditions.
78-08-5 Nine Keble Point Unit 1 does not use cable splices for electrical penetration assemblies.
78-08-6 Other Components a.
Radiation and temperature effects on electrical cable General Electric Vulkene Cable used for safety related systems which are required to mitigate accidents. have been environmentally qualified for conditions inside containment.
The electrical connector post accident environmental test discussed in item 1 above provides documentation.
Since conditions inside containment are more severe than. outside, Vulkene cabling is environmentally qualified for all
,applications at Nine Mile Point Unit l.
b..
Adequacy of separate versus sequential testing of environmental parameters We have reviewed applicable information for Sandia Laboratory testing.
The testing performed by these laboratories indicates that both cable and electrical connectors are not significantly affected by either separate or sequential testing.
Also, IEEE 323-1974 indicates that either method is acceptable.
Niagara Mohawk is not aware of information which may suggest that either type of test is inadequate.
Niagara Mohawk used a combined sequential and separate type test for the electrical connectors.
The electrical connectors were exposed to radiation separately.
Then a sequential loss of coolant accident. exposure was performed.
This included a combined steam, and humidity environment, with the connectors being energized at various times during the accident.
Further information was provided to the Nuclear Regulatory Commission in our test report which was submitted by letter dated April 3, 1978.
C ~
Temperature limitations on nylon components of solenoid valves Nylon components are not used within containment.
The equipment investigated included instrumentation
- cable, solenoids and electro-magnetic relief valves.
d.
Qualification of Electrical Transmitters No transmitters are installed 'inside containment.
During the 1979 refueling outage a new analog trip system was installed.
The qualification of this equipment was discussed in our letter dated March 27, 1979 to the Nuclear Regulatory Commission.
Also, the Containment Atmosphere Dilution system, transmitters outside containment have been qualified to IEEE 323.
These transmitters are required to mitigate accidents.
2.
Determine if the types of stem mounted limit switches described above are being used or planned for use on safety-related valves which are located inside containment at your facility. If so, provide a written report to the NRC within the time frame specified and to the. address specified in Item; 4 below.
Nine Mile Point Unit 1 uses qualified NAMCO. limit switches as discussed in 79'-01-1 above.
NAMCO limit switch models SL-2-C-11, S3CML, SAI-31
'AI-32,.
- D1200, EA-700 and ES-'70 are not used, in safety-related valves inside containment.
3 ~
Provide written evidence of the'ualification of electrical equipment required to function-under accident conditions.
For those items not having complete qualification data available for review, identify your plans, for determining qualification, either by testing or engineering
- analysis, or combination of these, or by replacement with qualified equipment.
Include your schedule for completing these actions and your justification for continued operation.
The attached information is provided to document qualification of electrical equipment.
The information shows that, electrical equipment inside contain-ment required to mitigate loss of coolant accidents is qualified for the service environment.
Additional information will be provided as discussed in Response
.4, below.
4 ~
Report any items which are identified as not meeting qualification require-ments for service intended to the Director, Division of Operating Reactors, Office of Nuclear Reactor Regulation, Nuclear Regulatory Commission, Washington, D.C. 20555 with a copy to the appropriate NRC Regional Office within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. of identification. If plant operation. is to continue followin identification, provide justification for such operation.
Provide a detailed written report within 14, days of identification to NRR, with a copy to the appropriate NRC Regional Office.
At, this stage in our review, we have not identified any components that do not meet the qualification requirements for the service intended.
Niagara Mohawk is continuing to investigate qualifications of safety related electrical equipment outside containment.
The results of this investigation will be reported to the Nuclear Regulatory Commission by July 11, 1979.
- However, due to the less severe environment outside containment, no inadequacies are expected.
If some items do not meet environmental qualification requirements, we will.i'dentify these in accordance with Request 4 above.
l
QUALIFICATION OF EQUIPMENT REQUIRED TO MITIGATE LOSS OF COOLANT ACCIDENTS INSIDE NINE MILE POINT UNIT 1 PRIMARY CONTAINMENT E ui ment Electrical Connectors Com onent Descri tion D. G. O'rien 19 pin //16 5 pin I/16 4 pin// 8 28 pin 816 See letter dated 3/07/79 from D. P. Disc'to T. Ippolito See letters dated 4/03/79 and 4/18/79 to T. Ippolito from D. P. Disc Environmental Conditions Environmental ualifications Terminal Blocks Limit Switches General Electric EB-5 NAMCO SL3 C58TW Same as above Same as above See letter dated January 31, 1978 T. Collopy to W. P. Nowicki See letter dated 7/29/75 from G. K. Rhode to B. C. Rusche Cable Splices Not applicable to Nine Mile Point Unit 1
Cabling General Electric Vulkene Same as above Qualified as part of the electrical connector test, see letters dated 4/03/78 and 4/18/79 from D. P. Disc to T. Ippolito Valve Operators Limitorque SMB-0 SMB-00 SMB-000 SMB-000-2 SMB-3 SMB-2 SB-4 Same as above See attached Test Report "Test of Limitorque Valve Operator to meet general requirements of an Electric Valve Actuation in Nuclear Reactor Containment Environment" Relief Valves Dresser Same as above See attached letter dated 5/16/68 C. S. Darrow to W. A. Rumberger
6'-:.PEP'AL
~~.-:~ ELE:I B.C COMPANY 175 CURTNER AVE., SAN JOSE, CALIF. 95125.. AREA CODE 408, TEL,"tgf-QUO,T~ IId. aIa.33II'JII6 fl - W-Ct u.
NUCLEAR ENERGY DIVISION Letter No. NM-1306 May 16, 1968 Mr. W. A. Rumberger-Niagara Mohawk Power Corp.
535 Washington Street Buffalo, New York
Reference:
Nine Mile Point Project Subj ect:
Electromatic Relief Valve Actuator Environmental Test
Dear Mr. Rumberger:
The subject test has been completed.
The actuator was operated every
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five minutes for ten hours in 'sixty>>two psig saturated steam.
The condition of the actuator box showed very definite evidence of the en-vironment.
The lead wires to the valve were vulkene, similar to that used in the drywell, and no wire deterioration was noted.
A retype of the report follows:
Introduction
'he actuator of the Dresser Electromatic Relief Valve must operate in saturated steam under accident conditions in the drywell.
The actua-tor consists of a double coil solenoid (made by G.E.).mounted on a base plate and covered with a sheet metal box.
The. base plate has holes for the solenoid plunger and conduit connector.
There are two micro-switches mounted on the solenoid frame to indicate that the solenoid has actuated.
Conclusions (1)
The actuator which was tested performed satisfactorily in 62 psi saturated steam for a ten hour duration.
0 (2)
The actuator will produce the required force with the supply voltage at 105 V D.C.
GENERALj$(,i ELECTRIC r
Mr. U. A. Rumberger May 16, 1968 Recommendations The soft rubber gasket between the solenoid and the base plate should be, removed fxom those actuators shipped to the field.
Tt serves no useful purpose and may prevent the plunger return, thereby holding the relief valveopen.
The actuatox tested did not have a gasket.
Procedure The actuator was placed on a stand with a hydraulic cylinder {extended) under the plunger, in an autoclave.
The hydraulic cylinder was con-nected through the wall of the autoclave to another hydraulic cylinder
{retxacted) which had a 58 lb. weight to test the actuating force o the solenoid.
The micxoswitches were connected thxough the wall of the autoclave, with a power source with separate indicator lights to.
test their reliability.
One hundred and twenty five volt D.C. power was'also connected through the autoclave wall with the necessary switchgeax to actuate the solenoid.
After the autoclave was pxessuxized to 62 psig saturated steam the solenoid was eriergized fox a one minute period in each five minutes, through a ten hour duration.
A t t was also run to see what the lower voltage was which would es w
b actuate and successfully lift the required load.
This was done y
lowering the DC voltage to the coil until it could not liftthe re-quired weight.
CSD.da cc'.
R. S. Eggleston Yours very truly, c.MQ~
C.
S. Darrow Project Manager Nine Mile Project ti't:-C L. l V 'I.'"
I"JCI.EAR ENGINE."Rl>IG SECTION ue zv l968 NIAGARAMOHAWKPOWER CORP.
0 E N E IIA L L E CT II I C GENERAL ELECTRIC COMPANY...... 3532 JAMES
- STREET, P.O.
BOX 4841
- SYRACUSE, NEW YORK
- 13221, Phone (315) 456-7321 INSTALLATION AND SERVICE
'EN G I NEER IN G DIVISION G-EA1-8-11
Subject:
Electrical Terminal Block Testing CC:
NIAGARA MOHAWK POWER CORP.
T. J. Perkins, NMP 1
T. E. Lempges, NMP 1
C. V. Mangan, Syracuse GENERAL ELECTRIC COMPANY January 31,.1978 P. A. Ahearn, Syracuse T.
R. Augello, San Jose J.
W. Shaver, NMP 1
Mr.
W. Nowicki Niagara Mohawk Power Corporation 300 Erie Boulevard, Hest
- Syracuse, New York 13093 Gear Bill:
Ik Several utilities have recently made inquiries on the qualification tests run by General Electric Company on electrical terminal blocks.
The interest stems from iaboratory tests conducted at Franklin Institute'n two types of terminals.
These are Marathon model number M6012 and Westinghouse model number 542247.
The equip-ment was evaluated for performance when exposed to pressure, temperature and humidity conditions resulting from a Loss of Coolant Accident.
The test was performed on unprotected terminal blocks defined as not installed in sealed or vented metal enclosures.
The Marathon terminal block failed to survive the twenty-four hour test duration while the Westinghouse terminal block passed the test.
Part of the General Electric electrical penetration qualification testing 'program, recently reviewed by the NRC during a quality audit, wa's to evaluate the effect of the high 'temperature, pressure and humidity experienced during a
LOCA on ter-minal blocks.
The types of terminal blocks tested were GE type CR151 and States Company type NT.
These were selected for testing since they are used in some power and control applications that could potentially be utilized in safety circuits which would be required to function in a
LOCA environment.
Terminal blocks for 'thermocouples were not included since these are not required t'o function during a
LOCA.
The test'was conducted with two adjacent terminals of each teIminal block connected to an IR rack with II16AWG wire passing through two sealed ports in the pressure vessel.
(See Test Circuit Diagram attached)
I
vzsv cxacUXT DxAGam XR Back SeaL'eal Termina1 Block Tamp Probe Seal Pressure Vessel Temp Controller Vater
GENERAL'"
., ELECTRIC Mr.
M. Nowicki Page 2
January 31, 1978 G-EA1-8-11 The. insulation resistance was measured between the two terminals with 500 vdc power supply at ambient condition.
The terminal blocks were then subjected to the LOCA condition, as shown in Table 1.
The insulation resistance was recorded at least once a day and at each significant temperature condition during the test.
After completion of the ten-day test, the cover was removed and the vessel was left open for 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> before final insulation resistance measurements were recorded.
Table 1
Temperature
'F Pressure PSIG Relative Humidity Duration 260 21 100 1.5 days 320 75 100 1.5 hrs 340 103 100 3 hrs 320 75 100 4.5 hrs 260 21 100 8 days The results 'of this test showed that the insulation resistance dropped but re-mained at a sufficient level to assure the continued function of electrical equip-s
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ient without circuit overload.
Once the steam environment was
- removed, the ter-minal block insulation resistance recovered almost fully to pretest values.
Each type showed no deterioration after testing except for some slight discoloration of the phenolic material.
It should be noted that while this test was evaluated for unprotected terminal blocks,'he terminal blocks provided with General Electric penetrations are mounted in sealed boxes mounted on the penetration thus making the test more conservative than the actual field application of the equipment.
If any questions arise as a result of this information, please contact me.
Sin
- ely, T. Collopy, Service Manager Mechanical=h Nuclear Service Installation 8 Service Engineering EMPIRE DISTRICT
'G.a, 0-5G,
'-5H D-5K ONE-PIECE TERMINALBOARDS 600 Volts Max June. 1976
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i l.". "'R2960SY138C APPLICATION MOLVED TERMINALBOARDS FOR CONTROL CIRCUITS CR151 Type B 30-ampere These molded terminal boards are for use in wiring of control panels. They are available with 4, 6, or 12 points and the ter-minals accommodate wire up to No. 10.
A new write-on marking strip markable with ink or pencil is included. Terminal boards may be mounted end-to-end without spacing.
P ING INFORMATION Mo Terminal Boards For Control Circuits30-Ampere MOLDED TERMINAL,BOARDS FOR POWER CIRCUITS CR2960 50-, 100-, 150-amperes These heavy-duty terminal boards are for use in primary or power circuits up to the amp rating listed. Blocks have binding screws for both incoming and outgoing lines.
FEATURES CR151 TYPE B TERMINALBOARDS'"
~ Rated 30-amperes, 600.volts for control circuits.
~ Available with 4-, 6eo and 12-points.
~ Screws, captive saddle-clamp, or washer head screw ter-minals on one side, clamp terminals on the other.
~ Terminals accept wires through size 410.
~ Write-on marking strips, 15-32-in. wide, provided with boards.
CR2960 TERMINALBOARDS
~ Power circuit boards rated 50-, 100-, and 150-amperes at 600-volts; available with 3 points per board.
~ All types have screw terminals.
ORDERING DIRECTIONS Order one piece terminal boards by complete catalog number.
Example: six-point one-piece boards are required, rated 30 arnps, 600 volts with screw-type terminals both sides: order 10 CR15186 I $24.00/pkg 10.
No. of Points (Clrculls)
Por Board QI 4
6 12 r
Screw Type '
~
Both SldesQE Catalog Number CR151 84 86
~ 82 Ust Price, GO 10G I
$18.00/Pkg; 24.00/Pkg.
43.00/Pkg.
Screw Type
~ One Side, Saddle Clamp Other SldePE Catalog Number CR151 845 865 825 Ust Price, GO-10G
$21.00/Pkg.
27.00/P kg.
50.00/P kg,.
Saddle Clamp Both SldasQI Catalog Number CR151 846
. 866 826 Ust Price, Go 10G
$24.00/Pkg.
30.00/Pkg.
56.00/Pkg.
- Washer, Head
- Screw, Both SldesPC Catalog, Number CR151 840 860820'st
- Price, GO.10G
$14.00/Pkg.
21.60/Pkg.
39.00/Pkg.
Molded Terminal Boards For Power Circuits50-, 100; 150-Ampere
REFERENCE:
Descriptive bulletin GEA-7317 Ctoss reference GEZ-6080 No. ot Points
'Clrcults)
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Per BoardQ 3
3
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'3 Amp Rating
'0 100 150
'atalog.
Number CR2960 SY139C38 SY139C3C SY139C3D Us1 Price, GO-10G
$ 6.70
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ttt catalog number represents one pktco. Sotd onty in pacaages ot 10.
Ordbr ct muttettes ol to p'aces.
DUAL DIMENSIONS,)BTBRs AND WEIGHTS (For Estimating Only)
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si'(I APPLICATION Where leads arc brought to any part for permanent or temporary connection, especially ifmany wires are involved.
DESCR I PTI ON The Type EB-5 are fabricated terminal boards. Each is <<c)uippcd with the neces-sary washer head binding screws for circuit wire connections, and also a white marking strip for circuit identification (ier ttst's a and b below). To mount, drill forNo. 10 screw. Board willaccommodate wires size No. 18 to No. 10 inclusive.
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For further information, contact your nearest General Electric Sales Office GENERAL EI.ECTRIC COMPANY POWER SYSTEMS MANAGEMf.i<iPRODUCTS DEPARTMENT PHILADELPHIA, I'cNNA. )9142