ML20031E773

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QA Program Insp Rept 99900901/81-03 on 810715.No Noncompliance Noted.Major Areas Inspected:Three Failures Which Occurred During Preconditioning Portion of Overall Test
ML20031E773
Person / Time
Issue date: 08/12/1981
From: Mcdonald D, Reinmuth G
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
Shared Package
ML20031E770 List:
References
CON-FIN-B-3101, REF-QA-99900901 NUDOCS 8110160407
Download: ML20031E773 (10)
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Text

__

U.S. NUCLEAR REGULATORY COMMISSION 0FFICE OF INSPECTION AND ENFORCEMENT Docket No.:

99900901/81-03 t

E_nvironmental Qualification Program:

Independent Verification Test No. 2, n

Report No. 1 Investigation of Failures During Preconditioning Tests Equipment Identification:

Test Specimen (s):

Nine single conductor, stranded copper, No. 12 AWG, chemically cross-linked polyethlene (XLPE) insulation (30 mils) with varying combinations of factory splices and insulation repairs.

Nine single conductor, stranded copper, No. 12 AWG, chemically cross-linked polyolefin insulation (30 mils) with varying combinations of factory splices and insulation repairs.

Nine single conductor, stranded copper, No. 6 AWG, chemically cross-linked polyolefin insulation (45 mils) with varying combinations of factory splices and insulation repairs.

Test Organization:

Sandia National Laboratories, Albuquerque, New Mexico 87185 Contract No.:

B3101 Inspection Conducted: Jul 15, 1981 i

Staff:

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[ wi Tr-17.,- P/

v D.G. Mcdonald,NRCConsultant,LosAlamo[

Date National Laboratory b

8 -/J-8 /

Approved By:

ta m G. W. Reinmuth, Chief, Vendor and Special Date Projects Branch, IE Summary: The purpose of this inspection was to obtain information relating to the three (3) failures which occurred during the preconditioning portion of the overall test.

Results:

The information obtained during this inspection indicate:

1.

Two of the three failures (specimens #1 and #10) were caused by handling.

2.

The third failure (specimen #19) appears to be located where the flanges of mandrel Nos. 2 and 3 are joined and was likely damaged during handling.

It cannot be substantiated at this time.

8110160407 811013 PDR GA999 EXISAM 99900901 PDR IE 09

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________--_-___-_-__--------,--------_------_a-a__-u_--_

2 3.

Test specimen #18 has lower readings than the other test specimens; however, it is within the acceptable ronge.

It is likely that the insulation may have been damaged. by handling.

It cannot be substantiated at this time.

'l I

l Details Section Prepared By:

D. G. Mcdonald A.

Persons Contacted E. E. Minor - Sandia National Laboratory (SNL)

L. L. Bonzon - SNL B.

General

,surpose of the subject test is to independently verify the environmental ino qualification of insulated conductors which contain factory splices and insulation rework.

The test is being conducted by SNL for the NRC in accordance with, " Test Plan for Independent Verification Test of Electric Cable with Factory Splices and Insulation Rework," Rev, 3, dated j

March 1981.

C.

Test Specimens The twenty-seven (27) test specimens are installed on mandrels.

Nine specimens are wound on each of three mandrels. provides pictures of the test specimens installed on the mandrels during the radiation portion of the test.

Each of the test specimens are wound around a mandrel twice which provide six or seven feet of the insulated conductors for exposure to the conditions.

The sample assembly which included the three (3) mandrels connected i

l together (see attachments 1 and 3) were visually observed at the SNL High Intensity Adjustable Cobalt Array (HIACA) facility.

The test l

specimens had completed the radiation aging, thermal aging and accident radiation portion of the test.

2 6

The test specimens, which did not meet the acceptance criteria of 10 x 10 ohms during the submerged insulation resistance (IR) measurements after the thermal aging, are Nos.1,10 and 19.

Based on observation and discussions with SNL personnel, it was concluded that sample No. 10 was damaged during handling of the sample assembly.

Abrari ns in the 9

insulation at the same location on both turns of the trst specimen on the mandrel could be seen.

Nothing could be determineJ on the other l

test specimens (1 and 19) by observation.

It wat de', ermined that the l

location of the failed insulation on test specimens Nos. 1 and 19 might be located by filling the lower portion of the test chamber with water j

and gradually raising it while maintaining the 500VDC on the test specimen. includes the IR readings and the various steps l

of the gradual submergence test. indicatos where the j

location of the weak or failed insulation was identified.

i D.

Observations and Findings l

The following findings were reached based on the gradual submergence i

test:

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. 1.

Test Specimen No. 10 - Visual observation of the specimen resulted in the location of damaged insulation.

The gradual submergence test confirmed that the IR readings indicated failure at the damaged insulation location.

The cause of fsilure was determined to be due to handling.

2.

Test specimen No. 1 - The IR readings indicated failure approximately 3 inches above mandrel No. 1.

A mirror was used and damaged to the insulation could be observed on the back side.

The bare condactor was exposed.

The cause of failure was determined to be due to handling.

3.

Test Specimen No. 19 - The IR readings indicated failure where the flanges of mandrel No. 2 and 3 are joined.

The test specimens are routed through holes drilled in the flanges.

The damage may have occurred during the assembly of the mandrels.

The edges of the holes which could be observed had been relieved of sharp edges.

The cause of failure cannot be determined without disassembly of the test specimens.

4.

Test Specimen No. 18 - This specimen exhibited lower IR readings than the other twenty-five (25) good test specimens.

The IR reading, although in the acceptable range, lowered when the water was approximately 8 inches above mandrel No. 2.

During the thermal aging, the No. 1 mandrel was separated from the sample assembly.

The 8 inches would be about where the lead of the test specimen would exit the thermal heating oven.

The insulation may have been damaged in handling.

The cause of failure cannot be determined without disassembly of the test specimens.

The overall assembly consisteu of 2 external leads for each of the test specimens for a total of fifty-four (54) individual insulated conductors (No. 12 and 6 AWG) which are approximately fifteen ft. long.

Two of the three failures are attributed to the required assembly, disassembly, transportation and handling required for the various portions of the test and is likely the cause for the other failure and low IR reading.

It should be noted that the test specimens are insulated conductors which do not have an overall cable jacket normally provided for field installations in long runs of cable trays and conduits.

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