ML20129J574

Trip Rept of 961001-03 Visit to Omega Point Labs in San Antonio,Tx to Witness Three Fire Endurance Tests Conducted for PG&E

ML20129J574
Person / Time
Site:	Diablo Canyon
Issue date:	11/05/1996
From:	Chris Bajwa NRC (Affiliation Not Assigned)
To:	Khadijah West NRC (Affiliation Not Assigned)
References
TAC-M96540, TAC-M96541, NUDOCS 9611070020
Download: ML20129J574 (14)

Text

. .- - -- .__ - .- -. .. - - - ---

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November 5, 1996 MEMORANDUM T0: K. Steven West, Chief i Fire Protection Engineering Section Plant Systems Branch FROM: Chris S. Bajwa, / l Reactor Systems Engineer /

Fire Protection Engineering Section l

SUBJECT:

TRIP TO OMEGA POINT LABORATORIES - PACIFIC GAS AND ELECTRIC i COMPANY (PG&E) PYR0 CRETE FIRE ENDURANCE TESTS (OCTOBEP l-3, 1996) (TAC. N0s. M96540 and 96541)

On October 1 - 3, 1996, I visited Omega Point Laboratories (OPL), San Antonio, i Texas to witness 3. fire endurance tests conducted for Pacific Gas and Electric Company (PG&E). Three separate test assemblies were constructed by PG&E using Pyrocrete and delivered to OPL. The test assemblies were constructed to represent configurations currently present at the Diablo Canyon Nuclear Power j Pl ant.

The assemblies included: 1) A 36 x 36 x 36 inch (nominal) box with a 2" thickness of Pyrocrete installed over the frame. A 27-1/2" long, 4" diameter rigid steel conduit was installed in the box 2" from the fireside face of the box; 2) An assembly similar to the first, with the addition of mineral wool insulation 1" thick installed over the Pyrocrete enclosure and covered with two (5/8") layers of Firecode type "c" gypsum wallboard; 3) A 36 x 36 x 36 inch (nominal) junction box enclosure, complete with hatch access doors and access door cover surrounding a simulated 20 gauge junction box.

The fire tests were conducted in accordance with Supplement I to Generic Letter 86-10, " Fire Endurance Test Acceptance Criteria for Fire Barrier Systems Used to Separate Redundant Safe Shutdown Trains Within the Same Fire Area." The techniques used to construct the test specimens followed the design details and procedures developed by PG&E, who constructed the .

specimens. Attached is my trip report which documents the results of these l tests.  !

Attachment:

As stated

Contact:

Chris Bajwa, NRR 301-415-1237 DISTRIBUTION: \ g  ;

Plant File Central File Docket File (50-275/323) SPLB R/F LMarsh CBajwa SWest PMadden Econnell SBloom DOCUMENT NAME: G:\SECTIONC\BAJWA\ INSPECTION \0PL.TST To rtceive a copy of this document, indicate in the box: "C" = Copy without attachment / enclosure "E" = Copy with D

y N:i ettachinent/enetosure "M" = Wo copy OFFICE NRR:SPLS l NRR:SPLS j ,l l l ) l NAME CBajwa f ?,' 6 SWest ' g M DATE 11/r f/% 11g/96 0FFICIAL RECORD COPY N.  %. i Ui-i 0.703~47

, n ' 7 D D 7_ D X Ha b

- . . - - ~ _ - ---- -. . - - - - - _ . .

. \

s ATTACHMENT TRIP REPORT Licensee: Pacific Gas and Electric Company (PG&E)

Docket Nos.: 50-275/323 Plant: Diablo Canyon Power Plant, Units 1 and 2 i

Test of Pyrocrete Fire Barriers and Junction Box Activity:

Trip date: October 1-3, 1996 Reviewer: Chris S. Bajwa, Reactor Systems Engineer, Fire Protection Engineering Section SPLB/DSSA/NRR INTRODUCTION On October 1 - 3, 1996, C. Bajwa visited Omega Point Laboratories (OPL), San Antonio, Texas to witness 3 fire endurance tests conducted for Pacific Gas and Electric Company (PG&E). Three separate test assemblies were constructed by PG&E using Pyrocrete, a cementatious fire resistant material, and delivered to OPL. The test assemblies were representations of configurations currently present at the Diablo Canyon Nuclear Power Plant.

l The objective of the tests was to qulify potective fire barrier systems for redundant essential cables in an Appendix R safe shut down circuit. l The fire tests were conducted in accordance with Supplement 1 to Generic Letter (GL) 86-10, " Fire Endurance Test Acceptance Criteria for Fire Barrier Systems Used to Separate Redundant Safe Shutdown Trains Within the Same Fire Area." The test specimens were constructed by PG&E in accordance with their design details and procedures.

Personnel contacted during this visit: Lou Pons, PG&E, Dave Bidwell, PG&E; Fleur de Peralta, Tri-En Corp.; Herb Stansberry, Cleda Patton, Deggary Priest, and Kerry Hitchkock of OPL.

TEST

SUMMARY

AND RESULTS On October 1-3, 1996, OPL performed 3 full-scale fire endurance tests of l Pyrocrete fire barriers representative of barriers used at the Diablo Canyon  !

Power Plant. The tests were conducted for PG&E, the licensee, in accordance I with Supplement 1 to GL 86-10, " Fire Endurance Test Acceptance Criteria for Fire Barrier Systems Used to Separate Redundant Safe Shutdown Trains Within the Same Fire Area."

The assemblies tested included the following:

(1) A 36 x 36 x 36 inch (nominal) assembly complete with 3/4" thick galvanized steel furring channels, USG 3.4 galvanized Diamond Mesh metal lath and a 2" thickness of Pyrocrete installed over the frame. A 27-1/2" long, 4" diameter rigid steel conduit was installed in the box 2" from the fireside face of the box. (See Figure 1) )

i

, (2) A 36 x 36 x 36 inch (nominal) assembly similar to the first, with the addition of 1" Z-bars (1" rise, 2" leg,18 ga galvanized steel) attached i to the Pyrocrete enclosure surfaces with 1/4"-20 bolts, 3" long, screwed )

into Hilti Toggler Bolt hollow wall anchors installed into holes  !

provided in the Pyrocrete. Mineral wool insulation 1" thick with 4 pcf i density was installed over the Pyrocrete enclosure and covered with two 5/8" layers of Firecode type "c" gypsum wallboard. Expanded galvanized metal lath corner guards (3" leg) were installed over the gypsum corners. The corner guards and screw heads were covered with joint compound. (See Figure 2)

(3) A 36 x 36 x 36 inch (nominal) junction box (JB) enclosure, complete with 3/16" steel plate interior, 3/4" thick galvanized steel furring channels, USG 3.4 galvanized Diamond Mesh metal lath and a 2" thickness  ;

of Pyrocrete installed over the frame. The assembly included 2 hinged  !

hatch access doors and an access door cover fabricated with 10 gage l steel plate, 3.4 galvanized mesh lath, 3/4" furring channels and 2" of l Pyrocrete. An instrumented 20 gauge junction box was fabricated by OPL l and installed inside the junction box enclosure. (See Figure 3) l All of the specimens were instrumented with 24 GA Chromel-Alumel, electrically welded thermocouples, and mounted on a 70 x 70 x 8 inch concrete test slab.

The assemblies were mounted in a test bulkhead (vertical wall) assembly which was mounted to the vertical fire resistana furnace.

The tests were conducted for a period of 120 minutes for the Pyrocrete box and l the junction box enclosure (assemblies 1 and 3), and 180 minutes for the Pyrocrete box with the additional layers of mineral wool and gypsum board (assembly 2). The tests were conducted following the ASTM E-Il9 standard time-temperature fire. For assemblies 1, 2, and 3, at the onset of the fire exposures, the ambient test temperatures were 67 *F, 72 "F, and 77 'F, respectively. Following the guidance of Supplement I to GL 86-10, this ambient temperature established the average temperature rise criterion (as measured on the unexposed side of the fire barrier material) at 317 'F, 322 'F and 327 'F, and the maximum single point temperature criterion at 392 "F, 397 *F, and 402 'F, respectively. Following the fire exposure, the assemblies were exposed to a fog nozzle hose stream test for 5 minutes in accordance with i the criteria specified in Supplement 1 to GL 86-10. On the basis of '

observations during the test, it appeared that test assemblies 1 and 3 met the 4 acceptance criteria specified in Supplement I to GL 86-10 for a fire rating of  !

2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, while assembly 2 appeared to meet the acceptance criteria for a 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> rating. A final determination of the performance of these barriers will require a review and evaluation of the final test report issued by OPL.

The results of the fire tests are presented in the Table 1 below.

1 l

l TABLE 1 R3pMY OF PGRE FIRE EIBLRAll TEST RESULTS FOR TESTING OF PTR0 CRETE ASSEMBLIES TEST SPECIIEW DLRATI(al TNERSIOCOLPLE (TC) AVERAGE 14AXIItal GL 86-10 0F TEST LOCATIONS TEarERATURE SINGLE-POINT ALLOWRALE (MINS) ('F) TEfrERATURE TEfrERAftstES:

OBSERVED /TC # AVG./IIAX.

(*F) (*F)

(1) PTROCRETE BOX W/ INTERNAL 4" 120' TC s's 1 5', 276 309 (#1) 317/392 CONDUIT FRONT OF CONDUIT TC #'s 6-11, N/A' 481 (#9) N/A*

SIDES OF BOX (ENGINEERING TCs)

TC #'s 12-15, N/A 170 N/A EXTERNAL SURFACE OF CONCRETE SLAB (ENGINEERING TCs)

(2) PYROCRETE BOX W/ INTERNAL 4" 180 TC #'s 1-5, FRONT 211 212 (#2) 322/397 CONDUIT AND ADDITIONAL INSULATION OF CONDUlf TC #'s 6-11, N/A' 214 (#7 AND 9) N/A SIDES OF B0X (ENGINEERING TCs)

(3) PYROCRETE JUNCTION BOX ENCLOSURE 120 JUNCTION BOX FACE N/A 306 (FRONT 327 (MAX)

TEMPERATURES FACE)

JUNCTION BOX N/A 329 (#2) 402 (MAX)

TEMPERATURES TC s's 1-29 BACK OF ENCLOSURE N/A 493 (#32) N/A DOORS TC #8s 30 - 37 (ENGINEERING TCs)

BACK OF DOOR N/A 600 (#39) N/A COVER TC #'s 38 42 (ENGINEERING TCs!

SIDES / TOP AND N/A 318 (#44) N/A BOTTOM OF JB ENCLOSURE TC #'s 43 - 54 (ENGINEERING TCs)

NOTES:

1. ALL SPECIMENS APPEARED TO PASS FIRE TESTS FOR THE INDICATED DURAfl0N

2. SEE APPENDIX 1 FOR THERMOCOUPLE LOCATIONS

3. AVERAGE TEMPERATURE WAS NOT SEPARATELY CALCULATED DURING THE TEST FOR THESE THERMOCOUPLES

6. NO MAXIMUM ALLOWABLE TEMPERATURE WAS SPECIFIED FOR ENGINEERING THERMOCOUPLES

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Sp cial Limits of Error ( 1.1 C), Project No. 15594-100410 purchased with lot traceability, F fast:ned to the conduit surface ' Pacific Gas And Electric Company (front) and the steel angle with small machine screws drilled and Thermocouple Placement Details tapped into the steel. The j (As-Built) thermojunctions were clamped Drawn By: # N#

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j electrically-welded thermocouples, Project No. 15594-100409 l Special Limits of Error ( 1.1*C), ]

j purchased with let traceability'

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Interior Box Enclosure Details - Front (back _of doors)

INTERIOR ELEVATION VIEW (from interior)

NOTE:

Tho specimen was instrumented with 24 GA Chromel-Alumel, electrically-l OMEGA POINT LABORATORIES,INC-welded thermocouples, Spec. ial imi L. .ts of Error (t1.1 C), purchased with lot .

Project No. 15594-100409 trac 0 ability, fastened to the interior surface with small machine screws Pacific Gas And Electric Company I

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drill:d and tapped into the steel skin.

The thermojunctions were clamped Box Thermocouple Locations between the steel skin and the heads _._ (As-Builti .j of these screws.

Drawn By. ##A# l l oPL Approval:  !

t 1/4" tolerance on all dimensions [^ "Og t-- - -

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th:rmocouples, Special Umits of Error

{

(11.1*C), purchased with tot traceability, Pacific Gas And Electric Company .

fast:ned to the interior juriction box i surface with small machine screws drilled Junction Box Thermocouple Locations l and tapped into the steel skin. The As Built) . _a th:rmojunctions were clamped between

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the steel skin and the heads of these g, GAD, o OPL Approval:

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NOTE:

The specimen was instrumented with 24 GA Chromel Alumel, OMEGA POINTlABORATORIES,INC.

electrically-welded thermocouples, {

Project No. 15594-100409 g Special Limits of Error ( 1.1 C),

purchased with lot traceability, Pacific Gas And Electric Company fastened to the interior surface -

with small machine screws drilled Box Thermocouple Locations and tapped into the steel sk.in. The tharmojunctions were clamped -Built) J l between the steel skin and the Dram By.

OPL Approval:

t M- M i heads of these screws.

o fo A >Og a <-

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b'!6Mf6'6???6:6:6R6:02Z, NOTE:

Tho specimen was instrumented

with 24 GA Chromel-Alumel, OMEGA POINT LABORATORIES,INC.

clectrically-welded thermocouples, Project No.15594-100409 Special Limits of Error ( 1.1 C), -

purchased with lot traceability' fastened to the interior surface Pac.fici Gas And Electn.c Company with small machine screws drilled and tapped into the steel sk.in. The Box Thermocouple Locations thumojunctions were clamped - (As _

between the steel skin and the heads of these screws.

Drawn By:

OPL Approval:

M. M 0Wu

[o A So<s. p . _

f/g Client Approvat:

1/4" tolerance on all dimensions c . - N *ygg

$ 4 AT O [,

Scale: 1"=1'