ML19093B413

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Response to Request for Performance of Environmental Qualification Testing on Certain Continental Cable Used at Surry Power Station
ML19093B413
Person / Time
Site: Surry  Dominion icon.png
Issue date: 09/28/1978
From: Stallings C
Virginia Electric & Power Co (VEPCO)
To: Eisenhut D
Office of Nuclear Reactor Regulation
References
Download: ML19093B413 (15)
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Text

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VIRGINIA ELECTRIC AND ER COMPANY e

~lGUtAYORYPowDOCKET Hlt G.PPY i)

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RICHMOND,VIRGINIA 23261 (J

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September 29. 1978 ~.~.;~~

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V> 0 Mr. D. G. Eisenhut, Assistant Director Serial No.* 534/091478 for Systems and Projects

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Division of Operati_ng Reactors Docket Nos. 50~280 Office of Nuclear Reactor Regulation 50~281

u. s. Nuclear Regulatory Coinmission License Nos. -* DPR--32 Washington; D. C. 20555 DPR...;37

Dear Mr. Eisenhut:

This is in response to your letter of September* :14, '1978 which requested* the.performance of environmental.qualification.testing on certain Continental cable used* at Surry Power* Station.

  • We intend to perform the testing which you have requested*. A copy of our proposed testing program is attached for your review*.*

Our current targetdatefor.test.c.ompletion.is*october31', 1978.

However, thedateof*testc.ompletion will be dependent upon completion of your.review of our testing program and on the availability of test facili-ties~ Should it become apparent that there will be a significant delay beyond our target date,* you will .be notified.

Very truly yours,*

~.)/)/). ,fi-z:ce:~

C.

  • M. Stallings Vice President-Power* Supply and Production Operations

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e SPECIFICATION FOR ENVIRONMENTAL TEST:HG OF INSTRUMENT CABLE

  • FOR SURRY UNITS 1 & 2

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.*. Page 1 e

.. TABLE OF CONTENTS

1. Introduction
2. Sample Description

.3* Test Program 3.1 Test Outline 3.1.1 Loss of Coolant Accident Test 3.1.2 Main Steam Line Break Test 3.2 Test Data 3.2.1 Loss of Coolant Accident 3.2.2 Main Steam Line Break

4. _Acceptance Criteria
5. Test Results

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1. INTRODUCTION The qualification Test Program*described in the specification is to be

. 1conducted to determine _wh(ther electrical instrumentation cables 1

rnanufactured by the Continental Wire &: Cable Corporation (now a di vision of Anaconda Co.) will function properly under environmental conditions

  • simulating those expected within the containment of the Surry Power

.Stations Units No. 1 and No. 2 of the Virginia Electric and Power Company during a postulated loss of cooling accident (LOCA) or during a main steam line break (MSLB).

The test program will include irradiation andadditional aging of the cable samples which have been in service.at Surry for more than seven years, exposure of the cables to a combined steam and chemical spray while electrically energized and a comparison of the physical properties of the samples before and after the environmental exposures.

Separate tests will be*conducted, one to simulate the LOCA conditions and a second test to simulate the MSLB environment *

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?* SAMPLE DESCRIPI'ION A.

I Instrumentation Cable

  • I conductor - No. 16 AWG (7) Tinned* Copper-

.number of conductors*~ 2 Insulation: 25 mil cross linked polyethylene Twist Lay: 2"

. Shield: Aluminum Mylar 100% coverage Drain: No 18 (7) Tinned copper Jacket.: 45 mil Hypelon (Black)° Sample was previously installed at Surry -Unit No~

and was identified as Cable No. The cable was initially installed in 1970 and removed July 1978 *.

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  • Page 4

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3. TEST PROGRAM 3.1 T~st Outline .. -:.~*  :

A. Seven (7) test samples shall be prepared, each about

. twclv~ (12~ feet long.

B. Three (3)*test samples shall be used for each test, loss

. of Coolan_t Accident (LOCA) and Main Steam Line Break O*L5LB)

.. C.

  • One ( 1) test sample shall be* forwarded to laboratory: for
  • initial measurement of all physical and electrical pro:...

perties, to include tensile strength, elongation, insulation resistance and dielectric withstand.

D.

  • No stated requirements of.the tests are to be changed or modified without prior agreement with the VEPCO. test engineer.

3.1.1

  • WCA Test .*

A. To simulate forty.years of in-plant use in a *-..(-

maximum ambient of 50c, six (6) test samples shall be thermally aged at ~~~-c for --~~~hours.

B_. Three (3) test samples shall *be exposed to garr.ma radiation at a dose rate of 1.0 megarads per hour for a total integrated do_se of 20 megarads.

c. A two (2) foot section of one irradiated and aged sample shall be forwarded to laboratory for measurement of all physical nnd electric~l properties.

D. The three (3) test ~amples shall be instailed, connected, instrumented and energized as shown in Fir;urc 5.

E. Each variable resistor shall he adjusted*for n cable current of 25 ma.

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e .* e The test ~amplcs shall be nubjectca to the Gimulated

--- WCA temperature/pressure/chemical spray envelopes as shown in .::-Figures 1 and 2. -=

G. All data for the environment and test samples shall be logged and retained *

. H. Following completion of the autoclave test, one (1) test sample shall be forwarded to laboratory for measurement of all physical and electrical properties.

J. Test parameters, test chamber temperature and pressure, test circuit current and voltages shall be logged at one (1) minute intervals for the first five (5) minutes of the tests, at 15 minute intervals for the*

first hour and then each hour thereafter until test completion.

}.1.2 MSLB Test A. Three (3) previously aged test samples shall be --<

exposed to gamma radiation at a dpse rate of 1 kilorads per hour for a to~al integrated dose of 20 kilorads.

B. A two (2) foot section of one irradiated and aged sample shall be forwarded to*labora tor:r for measurement of all physical and electrical properties.

C. The three (3) test samples shall be installed, connected, in~trumented, and energized as shown in Fic;urc 5.

  • D. Each variable resistor shall be adjusted for a cable
  • current of 25 ma.

E. The test samples .shall be subjected to the simulated MSLil tempcraturc/prcssurc/chcmic.al npray envelopes as

  • I nhown in FiGurcs 3 o.nd 4.

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F.

e All data for the environment and test samples a*

' shall be logged and retained.

G. Following completion of the autoclave test, one (1) test sample shall be forwarded to labor~tory for measurement of all physical and electrical properties.

H. Test parameters, test chamber temperature and pressure, test circuit current and voltages shall be logged at one ( 1) minute intervals for the first. five ( 5) minutes of the tests, at 15 minute intervals for the first hour and then each hour thereafter until test completion.

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., SURRY POWER STATION UNITS l&.2 LOCA TEMPERATURE TRANSIENT 30MtN OOMIN r20SEC r I

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,i; ~ERMINATION

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TIME AFTER LOCA (SECONDS)**

LOCA PROFILE

-TEST PROFILE

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SURRY POWER* STATION* UNITS 1&2 LOCA. *pRESSURE TRANSIENT 20 SEC 30MIN 90MIN 48 HRS 0 I I I

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LOCA PROF! LE .. ', *' .

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1 STEAM Llr--JE BREAK PRESSURE TRANSIE\-..lT 0 20 SEC IS MIN 60 MIN 48HR~

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STONE &. WrBSTER ENGINEERING CORPORATION

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  • QC. POWER SOURCE 50 VOLT

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TEST CHAM BER.

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2W SAMPLE CABLE lTYP)

NOTE: CABLE SHIELD TO BE INSULATED FROM CONDUCTORS AND GROUND.

CHEMICAL SPRAY SOLUTION TO BE 2500 PPM BORATED WATER WI TH.CAUSTIC (Na OH) ADDED.

Fl RST TWO HOURS 9.0 < pH < 11.0 TWO TO FORTY EIGHT 7.*0 . ' <pH<

9.0 FIG. NO. 5

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. - .* TYPE OF CABl-E:

2/C #16 OVERALL SHIELD 25 MILS XLPE' INSULATION.

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  • .45 ~!LS OVERALL HVPALON JACKET .38 OVERALL DIAMETER. -~

REGION=

I) NO.IS AWG. COPPER CONDUCTOR.

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2) 25 MILS (.025 ) XLPE INSULATION.

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3) AIR SPAC E DIMENSION ASSUMED SMALL.

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4) OVERALL ALUMINUM FOIL SHIELD- 2 MILS (;0020 ) THICK.

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5) OVERALL HYPALON JACKET- 65 MILS (.045 ) THICK
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. 6} ASBESTOS BINDING TAPE 6MILS {.006 ).

CROSS SECTION -

300V INSTRUMENT CABLE

. SURRY , POWER STATION UNITS l-AND2 I

FIG. NO 7 .,

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