ML20079L459
| ML20079L459 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 02/14/1983 |
| From: | NUCLEAR ENERGY SERVICES, INC. |
| To: | |
| Shared Package | |
| ML20079L452 | List: |
| References | |
| NUDOCS 8302230339 | |
| Download: ML20079L459 (33) | |
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_w-C01 PARIS 0NOF HEWC SYSTEP1 FIRE TEST TO SANDIA20-FT,SEPARATIGiTEST AND D E 9.5.1 l
l 0302230339 830214 PDR ADOCK 05000382 F
e TABil 0F CQUENTS 1
4
- 1. INTRODUCTION 1-1
- 2. HEMYC SYSTEM TEST 2-1 DESCRIPTION
- 3. RESULTS OF HEMYC TESTS 3-1
- 4. ASSESSMENT OF SN4DIA TESTS 4-1 N4DCMEB9.5.1
- 5. CONCLUSIONS 5-1 a
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1.
INTRODUCTION [
On December 3, 1982, representatives of NES/INSULCO and several utilities met with the NRC in Washington DC to present the HEMYC Fire Protection System.
The HEMYC System had been previously accepted by the ANI as a one-hour barrier for application to all U.S. cable types based on the E-119 fire test, hose stream, continuity and insulation resistance tests conducted in May 1982.
During the meeting, a concern about maximum cable temperatures achieved during the tests was discussed. In response to that concern, NES has prepared this paper, summarizing HEMYC test results and assessing other available data (Sandia 20-ft. separation report, CMEB 9.5.1) that were suggested to be 'perti-nent during the meeting.
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2.
HEMYC SYSTEM TEST DESCRIPTION Three tests were conducted for a variety of insulation wrapping and cable mix configurations for both cable trays and conduits exposed to the standard time-tempsrature curve defined by ASIM E-119.
During each test, control cables were energized with low voltage (24V) and connected to a light detec-tion system which indicated the occurrence of short circuits. Thermocouples were placed between cables in the trays and on the inner wall surfaces of the conduits.
Subsequent to the test, the cables were subjected to a "megger" test (at 500V.for a minimum of 30 seconds) to establish insulation resistance values, and a visual examination was conducted to evaluate any visible damage to the cable jackets.
- 1) Test No. 1 The layout for this test consisted of two 12-inch wide trays stacked vertically with 8 inches of vertical separation. The HEMYC system encapsulated both trays. The upper tray had 100%
visual fill with PE/PVC cables; the lower tray featured a single layer of the.same type of cable. The insulation material was placed around the trays with a 2-inch air gap.
- 2) Test No. 2 In this test, a 12-inch tray with a single layer of PE/PVC cables was insulated with a 2-inch air gap.
(In addition, two 4"-diameter conduits, 2 inches apart on the horizontal p~1ane, were also insulated with a 2-inch air gap. The conduit direct wrap method evaluated in Test No. 3 a.chieved better results and is being offered as.the preferred insulation approach for conduits.)
2-1
- 3) Test No. 3 In this test, a 12-inch tray with 100% visual fill of PE/PVC cables was insulated with a 2-inch air gap.
In ad.!ition, A
a single 4"-diameter condt:it was direct-wrapped.
Layouts of the configurations are showa.below.
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3.
RESULTS OF HEMYC TESTS In all of the configurations described, it was observed that:
- 1) The cables had maintained circuit continuity at all times.
- 2) Insulation resistance "megger" tests resulted in minimum values of 600 to =.'i G for direct wrap conduit cables and 150 to = M H for the tray cables.
(15 M1 is considered to be adequate by industry standards.)
- 3) No functional damage to the cables had occurred.
- 4) Maximum thermocouple temperatures for all three tests never exceeded 180 C at the 50-minute mark of the one-hour test and only one recorded as high as 215 C in single-layered tray and 210 C for direct-wrap conduit at the 60-minute end point of the test.
Detailed results are presented in Table 1 below:
l TABLE 1 HEMYC SYSTEM FIRE TEST RESULT _S.
l l
Maximum Ambient I
Temperatures Circuit Insulation Functional T_est No. Item 050 min.
@60 min.
Integrity,R,esistance.
- Damage, l
1 Upper Tray 60 C 63 C Yes "MG No Lower Tray 78 C 81 C Yes "MQ No 2
Tray (Single Layer) 180 C 215 C Yes 150- = MG No 105 110 C Yes "MG No 3
Tray (1007. fill)
ISO,C Conduit C
210 C Yes 600- = MG No (Direct wrap) t l
It should be noted that the temperatures reported above are ambient air readings as the thermocouples were placed between cables in the trays and on the inner wall surfaces in conduits. Actual cable jacket temperatures are lower tnan those reported above.
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4.
ASSESSMENT OF SANDIA TESTS AND CMEB 9.5.1 4.1 Sandia_ Tests An Underwriters Laboratory /SANDIA report, " Evaluation of Twenty-Foot Sep ration Distance, 10 CFR 50 Appendix R", has been referenced as having data on cable temperatures that may be pertinent to establishing
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the temperature levels at which cable insulation breakdown occurs. A review of the document indicates that the tests were performed to deter
- mine the effectiveness of the fire protection afforded by the separation of redundant safety-related cables by a horizontal distance of 20 feet with no intervening combustibles or hazards.
In addition to preliminary fire experiments per. formed to provide exact configuration data and check out the instrumentation, six full-scale tests were performed for a variety of cable types and tray configurations to provide information with respect to circuit integrity and voltage withstand of cable insula-tion.
While the report is not specific enough to allow the development of direct correlations between the occurence of circuit shorts and corresponding temperatures-(and thereby is of limited use for verifying HEMYC results), it does, nevertheless, present some data that confirm the margins of safety in the HEMYC system. Outlined on the following page are some of the salient features of the SANDIA tests that point tc the conservative nature of the direct applicability of their results.
4-1 r
- 1) Cables were placed in the 18-inch wide trays in continuous loops to simulate 42 cable segments across the trays. This indicates that cable failure (loss of load carrying ability due to shorts) was observed at the cable U-bends with extremely tight radii. Because of high stresses in the tight bends, cable insulation failed in those areas at relatively lov temperatures.
2)
Cable jacket temperatures were recorded by thermocouples installed in five locations in the middle of the trays (3.i feet from the bends) and, hence, are not directly indicative of temperatures at failure points at the bends at the time of observed shorts.
- 3) The test trays were subjected to open fire sources with potential exposure to direct flames and hot gases from the fire pans filled with heptane.
Sporadic puffs of irregularly shaped flames deflecting along the ceiling were observed in all tests. Hence, there were local hot spots in the cable trays which could not occur in trays and con-duits encapsulated by the HEMYC system.
- 4) Cables were secured to tray rungs with steel wire ties at the ends providing direct heat transfer paths which could contri-bute to cable f ailures at the bends.
Of the six tests conducted by SANDIA, Tests 1, 3 and 5 utilized non-qualified cables (3/C #12, PE/PVC) in layer loops in two 4-2
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(upper and lower) trays. Tests 2, 4 and 6 were run with IEEE-383 qualified cables. Upon review, results of Test 1 were selected as being most directly applicable, albeit within the limitations dis-cussed above, to the HDEC system, inasmuch as Test 1 also features PE/PVC cables in open ladder types with no tray covers and plate insulation on cables (as in Tests 3 and 4), or no 1/8" thick cable coatings of thermoplastic resins, flame retardant chemicals, and inorganic fibers (as in Tests 5 and 6).
Cable jacket temperatures were reported based on thermocouples embedded in cable jackets.
Gas (ambient) temperatures measured nearest the trays were also re-ported and are the equivalent temperatures comparable to those measured as ambient air values by the HDNC tests, which used therYto-couples placed between cables (or on the inner walls of the conduits) rather than within the cable jackets. A summary of results is given in the table below:
TABLE 2 SANDIA FIRE S110RTING RESULTS_
Upper Tray Lower Tray Cable Ambient Ambient Type Test No.
Time Temp?s Time Temp's Non-qualified 1 244 sec. 500 C 262 sec. 460 C NQ 3
PASSED 340 C max.
- 1043 sec.
- 230 C*
NQ 5
642 sec. 380 C 776 sec. 330 C Qualified 2
775 sec. 290 C PASSED 510 C max.
Q 4
PASSED 350 C max.
PASSED 350 C max.
Q 6
PASSED 390 C max.
PASSED 390 C max.
- This data point is s'uspicious as it reports a cable short at unexpectedly low ambient gas temperature of 230 C, four minutes after a peak of 350 C was recorded.
(The maximum cable jacket temperature at the time of the short was also recorded at an unlikely 70 C.)
4-3
Ambient gas temperatures reproduced in Table 2 are values measured
- at the time of the shorts for tests and trays where such shorts were observed.
In cases where the cables passed the fire test with no failure, the peak ambient gas temperatures recorded in the entire test are reported.
Results-indicate the the SANDIA non-qualified cables comparible to PE/PVC cables used in the HEMYC system were subjected to ambient gas temperatues of 330 C to 500 C before they shorted. Maximum cable jacket temperatures of 350 C were measured for Test 1 (the reference SANDIA test for comparison to HEMYC test) at the time of the short in lower tray.(244 seconds). The corresponding values for the upper tray at 262 seconds was 400 C.
Given that the HEMYC system is to be used on cables with under more conservative conditions (no tight s
radii, protected against direct flame and gases, etc.) and since the HEMYC tests resulted in no shorts and no functional damage up to ambient air temperatues of 215 C, it can be concluded that the HEMYC system exceeds the temperature requirements of a one hour fire barrier.
4.2 CMEB 9.5.1 An evaluation of the applicability of NRC Position CMEB 9.5.1 require-
. ments to cable temperatures indicates that the 325 F (163 C) acceptance.
criterion stipulated therein was primarily established for fire stops and penetrations designed to prevent ignition of nearby combustibles, such as oil tanks, stored gas, hydrogen lines, etc., on the unexposed side.
l Accordingly, this criterion cannot be censidered a realistic limit for tray and genduit insulation.
4-4
i 5.
CONCLUSIoxs EEMYC tests resulted in no cable damage, no loss of continuity _and in-sulation resistance, even for maximum temperatures of up to 215 C reached
-during the tests.
In the SANDIA tests, temperatures of up to 330 C were shown not to compromise the ability of the cables to carry full load, cable insulation resistance remained acceptable and no functional damage was shown.
In conclusion, the HEMYC system has adequately demonstrated its ability to protect cable safety channels following a one-hour (ASTM E-119) fire and subsequent hcse stream test.
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HOSE STa=m TEST PERFOPEED TO THE ANI It4FO??ATION SU'_LETI:: 5C79),
"Ril/FAERP STROADS FIRE ETOUPXJCE TEST METHOD TO QUALIFY A PROTECTIVE Ef#ELO?E FOR CLASS E ELECTRICAL CIRCUITS, SECTICN 3.4.2, TEST fl, (PREFERREDTEST)."
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. INSTAf I:n WITHOUT MDDIFICATIONS TO THE CA3LE TRAVS NO CGOUITS (1.E., NO DRILLING OR WELDIN3)
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INSTAI!ATION
- INSTALL FRAMEiCRK TO PROVIDE A 2-Itch DEAD AIR SPACE.
- INSTALL BLANKETS WITH A 2-Itch c"ERLA=
(ItOIVID' AL Bl144KET SECTIONS ARE SIZED TO J
EtiSURE A MINIMJM OF 2 INCHES 0: CVERLAC.)
- CUT El>JiKET AS NECESSARY TO EtNELOPE STRUCTURAL tO SERS
. CUTOLris REPAIRED BY STUFFIN3 CDITIQ'AL CERAMIC FIEER (REPLACE RiY LOSE 0: FIEER)
. PATCHED WITH SILTEMP CLOTH
. CLOTH COARSELY STITCHED IN P!JCE
. SILTEMP PATCH IS PROVIDED TO KEEP THE CEPA'i!C FIEER FROM DISLO33ING :RIOR TC N O AFTER THE FIRE.
DERLADS ItOIVIDUAL BLANKETS ARE CONNECTED EY ATTACHIN3 i
THEM TO A COMMON CONNECTCR (STLO) WITH A MINIMJ'4 1
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DEVELOPED TEST PROCEDURES USIf;3 FE/FVC CAELE TYPES.
CSTAI!ED SER/ ICES 0.: AN A5 E=T : = Fu h:.
sue:4ITTe TEST PROCED'uRES Ro Fu:1: ACE DESIGN DATA TO Ri!.
RJI A: PROVAL TO C0tOUCT FIRE TEST.
ANI SELECTED EU::AU V:DITLE AS CE:T! YIN 3 THIPO PARTY.
IESTS
- WITf;ESS BY 32.3 PROD'J TION RO G/0; STA:F
- BU:, EAU VERITAS STAFF - (MliiTORD A'_L P."ASES OF TESTING AfD CALIBFATION.)
HE*4YC REPRESENTATIVES i
F.E.C. TESTIf:s no cA/o: FERSONNEL TESTS RESU'_TS CE.TIFIED EY EU:E*U VE:ITAS.
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- CABLE LOADif4GS A'O Tf?E PER Ril CRITERIA h0-1
. IiULTIPLE CABLE TRAY
. SYSTEM CQiTINIGJS THRCi)34 WALL (PENETPATIGi SEAL APPLIED WITHIN HEMfC SYSTEF9 Stts-2
. ' SIN 3LE TRAY
. MULTIPLE CGiD'JITS - WITH STRO-CF.:
. C'G LE DROPS (DIRECT WSA:)
. JU*?CTIO*J BOX (E 4 CLOSURE)
. SYSTEM FLARED TO KALL (CASE WITH EXISTIN3 PENETRATIO0 Staa-1
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