ML20027B670
| ML20027B670 | |
| Person / Time | |
|---|---|
| Issue date: | 01/15/1982 |
| From: | Bennett A, Reinmuth G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| Shared Package | |
| ML20027B656 | List: |
| References | |
| FOIA-82-345 IVIR-4, NUDOCS 8209290195 | |
| Download: ML20027B670 (13) | |
Text
..
U. S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT January 20,198'.
Report No.:
IVIR-4 Company:
The Rockbestos Company New Haven, CT Equipment Environmental Qualification Program:
Independent Verification Inspection No. 4 Report No. 1 - Review test set-up, observe initiation of LOCA environmental test, review of the autoclave test procedure, witness opening of autoclave and inspection of specimens at conclusion of test.
Equipment Identification:
Component:
100 Series Adverse Service Coaxial Cable Second Generation Products (polymer LD & Revised Braid Angle)
Voltage Cable Conductor Rating
- Designation Size (AWG)
(Volts)
Insulation RSS-6-100-A 26 1425 Polymer LD & Polyolefin RSS-6-104 22 1725 Polymer LD & Polyolefin RSS-6-109 18 750 Polymer LD & Polyolefin RSS-6-110 18 750 Polymer LD & Polyolefin RSS-6-ll2 18 1500 Polymer LD & Polyolefin See detailed Section for specific data.
- 75 Percent of Corona Extinction Voltage Inspector:
m" ft A. B. Bennett, Senfor Electrical Engineer
' Date
]
v b+t%M Old Approved By:
G. W. Reinmuth, Chief, Vendor and Special Projects Date Branch, Division of Resident and Regional f.eactor Inspection, IE Summary:
The autoclave test facility at The Rockbestos Company, New Haven, CT was inspected on October 22, 23, 1981 for the purpose of observing the test set-up and initiation of LOCA testing and on November 23, 1981 to witness the conclusion of LOCA environmental testing of coaxial cable specimens.
Results:
The results of the autoclave test facility inspection indicate that it is capable of performing environmental qualification testing in accordance with current regulatory requirements.
The Rockbestos personnel attending the test facility were knowledgeable of the test facility design and of its operation 8209290195 820826 PDR FOIA YOUNCO2-345 PDR
. pertaining to the specific environmental qualification testing.
Detailed autoclave operating procedures were reviewed and they appeared to reflect the requirements in sufficient detail for performance of the environmental qualification testing.
One of the cable specimens failed to maintain the applied voltage (600 volts ac) shortly after initiation of steam into the test chamber, and indicated a lou insulation resistance measurement.
All other cables indicated high insulation resistance measure-ments and could maintain the applied potential of 600 volts.
During the 31 day LOCA exposure test a total of 5 specimens failed to maintain the applied voltage and exhibited reduced insulation resistance values.
Preliminary investigation by Rockbestos indicates that insulation expansion experienced during accelerated thermal aging (150 C) apparently contributed to the failures.
Continued environmental qualification testing will be pursued by Rockbestos on the second paneration coaxial cable design with emphasis on lower thermal' aging temperatures-and cable sealing techniques.
l l
I
Details Section A.
Persons Contacted G. Littlehales, Manager, Quality Assurance E. D'Aquanno, Chief Engineer T. Henderson, Sales Engineer R. Prout, Design Engineer K. Gianotti, Test Engineer R. Gehm, Technical Director B.
Inspection of the Test Facility The objectives of this area of the inspection were to:
1.
Observe the autoclave test chamber, steam and spray systems and associated instrumentation.
2.
Observe the test specimen mounting arrangement, including the interfaces with external cable connections.
3.
Discuss the test performance details with the personnel performing and monitoring the test.
4.
Review the test instrumentation requirements and data.
5.
Review the autoclave operating procedures for performing LOCA testing.
C.
Findings The autoclave test facility is used for performing environmental qualification of the insulated electrical cable for use in hazardous environments.
The particular environmental qualification test being performed by Rockbestos involves coaxial cable that has been redesigned following failures of the original coaxial cable during environmental qualification testing of a high range radiation monitoring system by General Atomics Corporation.
These failures were reported via a 10 CFR 50 Part 21 report dated May 15, 1981.
The autoclave chamber (Fig. 1) is a horizontal jacketed pressure chamber 36 inches in diameter by 54 inches long at the crown.
The test sample area is 36 inches long by 30 inches wide.
The autoclave contains a jacket that is physically isolated from the chamber, complete with an independent steam supply from that of the chamber.
Normally, steam is supplied to the jacket and the chamber temperature is controlled by a Robert Shaw recording controller.
The controller adjusts the position of 1/2 inch Kieley-Mueller air operated valve positioners.
The valve positions respond to preset ternerature settings on the controller to control the amount of steam flow through the jacket.
Control of steam to the test chamber is performed from a control console (Fig. 2) by operation of manual control switches.
These switches control the position of Kieley-Mueller air operated valves, a " fill" valve in the
< team supply lire to the test chamber and a " vent" valve in the line
' exiting the test chamber.
All functions except chemical spray flow rate and spray solution preheater temperature setting are controlled from the control console.
The autoclave chamber contains the necessary instrumentatiq (thermocouples, pressure taps) to provide readout at the control console.
{
Condensation is periodically drained from the test chamber to a holding tank located on the floor beneath the autoclave test facility.
Since the temperature controller was inoperative, this test was performed by controlling the steam supply to the test chamber.
Interlocks are provided to assure that steam cannot be admitted into the chamber unless the door is closed and the door cannot be opened until chamber pressure is reduced to less than 0.5 psig.
A pressure relief valve is installed in the main steam line (set for 165 psig) and another in the line to the test chamber and autoclave jacket (set for 145 psig) to protect the components from overpressurization.
1.
Autoclave Operating Procedures The following detailed operating procedures were reviewed:
Instruction Manual for Autoclave Test Facility, Type Number 268X a.
AFE Number R-315.
b.
Autoclave Operation Procedure for Combined PWR/BWR Environment Simulation, Revised 1/10/79.
The above documents consist of detailed procedures for operating the components of the autoclave test facility to obtain the required environmental (temperature / pressure) profiles.
A review of these documents indicate that they satisfy the IEEE 322-1974 requirements for environmental qualification testing.
l 0.
Observation of the LOCA Environmental Test i
1.
Objectives lhe objectives of this area of the inspection were to:
I Observe the perforrince of steam / chemical spray admission to the I
a.
test chamber.
b.
Review the data obtained during the initial stages of the environ-
[
mental tcst.
I I
f
. 2.
Findings a.
The test specimens consisted of 25 ft. lengths each of the following coaxial cable:
Quality Designation 2
RSS-6-100-A One of each specimen type was thermally aged for 7 days at 2
RSS-6-104 150 C and then irradiated 200 2
RSS-6-109 megarads.
The other specimen 2
RSS-6-110 was irradiated 200 megarads but 2
RSS-6-112 not thermally aged.
The specimens were arranged in two assemblies.
The specimens of each assembly were spliced to a conventional 7 conductor no. 12 AWG control cable and the control cables were brought out of the test chamber.
The coaxial cables were spliced and the splices and ends were sealed using Raychem kits.
These kits included insulated plugs and shrink tubing.
The coaxial test specimens were energized with 600 volts a.c. and insulation resistance measurements taken via the 7 conductor control cables at intervals throughout the LOCA exposure test.
b.
Admission of steam / chemical spray into the chamber The operator introduced steam and chemcial spray into the test chamber by operation of switches from the control console.
l Chamber temperature and pressure can be monitored from gauges l
located at the control console.
Temperature is continuously recorded for future data reduction.
Because the jacket was not
< used for preheating, the time for the chamber temperature.to I
i reach 340 F was_1;riger than normal, approximately 15 minutes
- v.ersus 3-5 minutes normally attained.
At approximately 10 minutes after introduction of steam / chemical spray into the chamber, one of the specimens (RSS-6-100 A-1) failed to maintain the 600 volts a.c. and tripped off the line.
Periodic attempts to reinstate the voltage to the cable were l
unsuccessful, Reduced insulation resistance values were l
observed on cable 100 A ' (1800 ohms) versus values in excess of 1 megohm on other cables.
Although two other failures occurred during the first 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />
(
(cables RSS-6-104-1 and RSS-6-110-1) the decision to continue the environmental test for 30 days was made by Rockbestos.
Two additional failures (cables RSS-6-109-1 and RSS-6-110-3) l occurred during the test period (at approximately 5 days into l
the test).
l l
o
. E.
Observation of the Termination of the LOCA Environmental Test 1.
Objectives The objectives of this area of the inspection were to:
Observe the physical condition of the test specimens.
a.
b.
Review the data accumulated during the test phase.
2.
Findings The cables contained crud deposits, apparently from the chemical a.
spray components and impurities in the steam.
Other than the deposits, the cables and splices were generally in good condition.
Three plugs used to seal the ends of the cables were found inside the chamber.
The loss of these plugs would expose the cable ends to the chamber environment.
Observation disclosed that the plugs were missing from cables (RSS-6-110-1, RSS-6-109-1 and RSS-6-109-3) and failures included all of these cables.
b.
Review of the data confirmed the failures outlined in the preceding paragraph and is summarized herein:
Cable End plug status Thermally aged RSS-6-100-A-1 Intact Yes RSS-6-104-1 Intact Yes RSS-6-109-1 Missing Yes RSS-6-110-1 Missing Yes RSS-6-110-3 Missing No Of the 5 failures 4 were on cables that had been thermally aged prior to the LOCA test.
The other cable failure was one which had lost the cable end plug during the test.
F.
Post Testing Investigation by Rockbestos Investigation of the thermally aged cables disclosed insulation material exuding through the braid leaving voids in the insulation.
These voids were fairly uniform, occurring every 4-6 inches.
It was postulated by Rockbestos that these voids would permit condensation impregnation during the test phase and create a conducting path between the shield and conductor.
These voids were also observed on cable that had been thermally i
,----,a
. aged at 150 C but not subjected to the LOCA environment.
Also to be noted is that the failure of the cable that had not been thermally aged included one that was missing the end plug at the conclusion of the test.
Enclosures:
Figure 1 - Autoclave Chamber Figure 2 - Control Station i
Rockbestos Data Sheets For Coaxial Cable:
RSS-6-100 i
RSS-6-104 RSS-6-109 RSS-6-110 RSS-6-112 i
t i
9 e
l
{
t l
l r
i
Page 10
. ~ =
/
A.%.
.'=;
f,f '
\\
- 1 I l csw:
.I
~
-~
/r 1
' ~
ew-I
,5)?-
'I g
!)[}
i,-
% i4rgT...
.L 5.
. si en e
4 q
.i g
v u..
-" x.Mq.. -1 hm;
. ],, /
Figure 1 Autoclave Chamber l
-' '"'~h%;
p r-,
f
); ):
- = __
i i
' QL,= t/.%
- ./'~:
... c
.._ _ _ c
_ %+1. A, J-L m
l 3,, ~.
~,_-
g jp
.. -, c-aa 1
at,p;$tF L"EjdjNfVE t e538
?g 4 1
g m
NQ[/PIM l
l l
aas-9-iog Coaxial Cable Adverse Service
(- 1/20/
.195 1 004
.137
.116 1 004
.043
.035 t
4
<i Jacket Shield 2nd Insulation 1st Insulation' Conductor Description Construction Details Conductor 21 AWG Tin Coated Copper (19x33) to ASTM B33 & 8286 Ist Insulation Rockbestos Polymer LD 2nd Insulation Radiation Cross-Linked fiodified Polyolefin Shield 36 AWG Tin Coated Cocoer to ASTM B33, 90% (min.) Coveraoe Jacket Radiation Cross-Linked. Flame Retardant Non-Corrosive Hodified Polyolefin Electrical Properties Impedance 48 ohms (nominal)
)
Ca pacitance 32.8 pf/ft. (nominal)
)
For Engineering Velocity 65% (nominal
)
Reference Only Dielectric Constant 2.4 (nominal
)
- Corona Extinction 1900 volts ( s) (minimum)
- Insulation Resistance 106 megohms for 1000 ft. (minimum)
- Dielectric Withstand 4000 volts (ms) (minimum)
Physical Properties Weight 25.2 lb/1000 ft. (nominal) 111nimum Bend Radius 2.5 inches for pemanent installation Environmental Properties
. Cold Bend
-40*C on a 2.0 inch mandrel Flamability
- IPCEA S-19-81, Sec. 6.19.6 (September 1077)
This cable is suitable for Class lE service in nuclear generating stations and meets anplicable requirements of IEEE 383-1974. The cable will operate at temneratures un to 250*C for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />,171*C for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 150*C for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />.
Continuous service up to 110*C.
Dimensions are in inches and are nominal unless otherwise designated.
Required tests to be run in accordance with Rockbestos Test Procedures.
- Production Tests
. @D.
[trs=P n_is$ THE 1ROCKBESTOS COMPANY SL #
,W7 YI NEW HAVEN, CONNECTICUT 06504 USA TELEPHON E: (203) 772-2250 TELEX: 710-465-2149 SKY
wayarnwe
-a-c i m fdv*r'a Sarvice Date - 2/1
- Vitfon.
.242 1 004
.173
.146 1 004
.048
.032 y
J 4
L m
o Jacket Shield 2nd Insulation ist Insulation Conductor Descriotion Construction Detailt
__ Conductor 22 AWG Tin Coated Cotmr (19x341 to ASTM B33 & B286 1st Insulation Rockbestos Polymer LD 2nd insulation Radiation Cross-Linked, S4odified Polvolefin Shield 34 AWG Tin Coated Cooper to ASTM B33, 90% ("inimum) Coveraoe Jacket Radiation Cross-Linked Flame Retardant, Non-Corrosive Modified Polyo Electrical P orcrties Impedance Capacitance 62 ohms (nominal)
)
Velocity 25.7 of/f t. (nominal)
Dielectric Constant 64% (nominal)
For Engineering
- Corona Extinction 2.4 (nominal)
Reference nnly
- Insulation Resistance 23g0 volts (ms) (minimum) 10
- Dielectric Withstand negahms for 1000 ft. (minimum) 5000 volts (rms)(minimum Physical Properties Weight Minimum Bend Radius 36.6 lb/1000 Ft. (nominal) 3.0 inches for permanent installation Environmental Properties Cold Bend Flarnability
-40*C on a 2.5 inch rnandrel
- 1PCEA S-19-81, Dec. 6.19.6 (Sentember 1977)
This cable is suitable for Class lE service in nuclear nencrating stations and meets annlica i
of IEEE 333-1974. The cable for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />. Continuous service uo to 110*C.will operate at temperatures up to 250*C for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />,171 recuirements Dimensions are in inches and are nominal unless otherwise desionated.
P.equired tests to be run in accordance with r!ockbestos Test Procedures
- Production Tests 1
i i
C**
_a n'%g Tas reocxassros commuy i
Yjif M 55/
NEW HAVEN, CONNECTICUT 06504 USA TELEPHONE: (203) 772-2250 TELEX: 710-465-2149
Triaxial Cable Adverse Service pyj3{on-
.437 Nom.
.446 Max.
.371
.350
.306
.285,+.007
.056
.048 f
1r y
a L
2nd Jacket 2nd Shield 1st Jacket 1st Shield 2nd Insulation 1st Insulation Conductor Description Construction Details Conductor 18 AWG Tin Coated Copper (7x26) to ASTM B33 & B286 1st Insulation Rockbestos Polmer LD 2nd Insulation Radiation Cross-Linked Modified Polyolefin 1st Shield 36 AWG Tin Coated Copper to ASTM B33, 90% (Min.) Coverage 1st Jacket Radiation Cross-Linked, Non-Corrosive. Flame Retardant flodified Polyolefin 2nd Shield 36 AWG Tin Coated Copper to ASTM B33, 90% Min. Coverace 2nd Jacket Radiation Cross-Linked, Non-Corrosive Flame Retardant Modified Polyolefin Electrical Properties Impedance 73 ohms (nominal)
)
Capacitance 21.2 pf/ft. (nominal)
)
For Engineering Yelocity 66% (nominal)
)
Deference Only Dielectric Constant 2.3 (nominal)
)
- Corona Extinction 10g0 volts (ms) (minimum)
- Insulation Resistance 10 megohms for 1000 ft. (minimum)
- Dielectric Withstand 5000 volts (ms) (minimum) i 10.00 volts (ms) (minimum) between shield; Physical Properties Weight 116 lb/lonn ft. (nominal)
Minirum Bend Radius 5.0 inches for pemanent installation Environnental Properties Cold Bend
-40*C on a 4.5 inch mandrel Flamability
- IPCEA S-19-81. Section 6.19.6 (Seotember 1977)
This cable is suitable for Class lE service in nuclear generating stations and meets applicable recuirements of IEEE 333-1974 The cable will operate at temneratures up to 250*C for i hour,171*C for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 150*C for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />. Continuous service up to 110*C.
Dimensions are in inches and are ntwninal unless othemise desionated.
Recuired tests to be run in accordance with Rockbestos Test Procedures.
- Production Tests
.A.
[ at h $
THE ROCKBESTOS COMPANY NN NEW HAVEN, CONNECTICUT 06504 USA TELEPHONE: (203) 772-2250 TE LEX: 710-465-2149 DM 1
key sion7i' Cnwi=1 Cable Mvere a (=-vir.
.414 Nom.
439 Max.
.348
.327
.306
.285 +.007
.056
.048 n
?'
h Jacket 3rd Shield 2nd Shield 1st Shield 2nd Insul.
1st Insul.
Conductor Description Construction Details conductor 18 AWG Tin Coated Coceer (7x26) to AST?1 B33 & B286 ist Insulation Rockbestos Polymer LD 2nd Insulation Radiation Cross-1 inked Modified Polvolefin I
lst Shield 36 AWG Tin Coated Cocoer to ASTM B33, 90% (Min.) Coverace 2nd Shield 36 AllG Tin Coated Cooper to ASTf1 B33, 90% (flin.) Coverage j
3rd Shield 36 AWG Tin Coated Copeer to ASTf! B33, 9n! (Pin.) Coverane Jacket Radiation Cross-Linked, Flame Petardant, flon-Corrosive "odified Polvolefin E_lectrical Properties Impedance 73 ohms (nominal)
)
Capacitance 21.2 pf/f t. (nominal)
)
For Ennineering Velocity 66% (nominal)
)
Peference Only Dielectric Constant 2.3 (nominal)
)
- Corona Extinction 10gG volts (ms) (minimum)
- Insulation Resistance 10 recohms for 1000 ft. (minimum)
- Dielectric Withstand 5000 volts (rms) (minimum)
Physical Properties Weight 120 lb/1000 f t. (nominal)
!!inimum Bend Radius 5.0 inches for nermanent installation Environmental Properties Cold Bend
-40*C on a 4.25 inch mandrel l
Flamability
- IPCEA S-19-81, Sec. 6.19.6 (Sentember,1077)
This cable is suitable for Class lE service in nuclear ceneratino stations and r'eets annlicable recuirements l
of IEEE 383-1974. The cable will operate at temperatures un to 250*C for I hour,171*C for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, and 150*C for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />. Continuous service up to 110*C.
Dimensions are in inches and are nominal unless otherwise desinnated.
l P.equired tests to be run in accordance with P.ockbestos Test Procedures.
l
- Production Tests
. ?=+
[& d_Ws THE ROCKBEOTOS COMFhNY
==
YN NEW HAVEN, CONNECTICUT 06504 USA TELEPHONE: (203) 772-225')
TELEX: 710-465-210 l
NIW/
l l
420 o.010
.339
.312
.285 o.006
.093 o.002
.058
.050 F
u
~
l 0
a g
Jacket 2nd Shield 1st Shield 3rd Insulation 2nd I.1sulation 1st Insulation Conductors Description Construction Details Conductors 18 AWG Tin Coated Cooper (19x30) to ASTP B33 & R286 ist Insulation Rockbestos Polymer LD 2nd Insulation Radiation Cross-Linked liodified Polyolefin 3rd Insulation Radiation Cross-Linked Modified Polvolefin 1st Shield 34 AWG Tin Coated Cooper to ASTM B33, 90: (minimum)Coveraoe 2nd Shield 34 AUG Tin Coated Copper to ASTM B33, 90: (minimum) Coverage i
Jacket Radiation Cross-Linked, Flame Retardant, Fon-Corrosive Modified Polyolefin' Electrical Properties Impedance 89 ohms (nominal) 1 Capacitance 14.0 pf/ft. (nominal) ]
For Enoineering Velocity 65: (nomal)
/
Reference Only l
Dielectric Constant 2.4 (nominal)
J
- Corona Extinction 10g0 volts (ms) (nominal) 20
)
- Insulation Resistance megohms for 1000 ft. (minimum)
' Dielectric Withstand 2000 volts (ms) (minimum)
Physical Properties Weight 114 lb/1000 ft. (nominal)
Minimum Rend Radius
.5.0 inches for permanent installation Environmental Pronerties Cold Bend
-40'C on a 4.25 inch mandrel Flamability
- IPCEf. 5-19-81, Sect. 6.19.6 (Sentember 1977) l This cable is suitable for Class lE service in nuclear ceneratino stations and meets annlicable requirenents of IEEE 333-1974 The cable will onerate at temperatures up to 250'C for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />,171*C for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 150*C for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />. Continuous service un to 110*C.
j Oirensions are in inches and are nominal unless otherwise desionated.
1 Cequired tests to be run in accordance with RocFbestos Test Procedures.
- Production Tests i
i l 81 t===ssW)
THE ROCKBESTOS COMmNYl kY d NEW HAVEN, CONNECTICUT 06504 USA TELEPHONE: (203) 772-2250 TELEX: 710-465-214@l
%WY 1
-