ML20213G192
| ML20213G192 | |
| Person / Time | |
|---|---|
| Issue date: | 05/04/1987 |
| From: | Alexander S, Potapovs U Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20213G185 | List: |
| References | |
| REF-QA-99900902 NUDOCS 8705180173 | |
| Download: ML20213G192 (6) | |
Text
ORGANIZATf0N: WYLE LABORATORIES HUNTSVILLE, ALABAMA REFORT INSPECTION INSPECTION NO.: 99900902/87-01 DATES: 02/03-04/P7 OM-STTF F0tmR-19 CORRESPONDENCE ADDRESS: Wyle Laboratories Scientific Services and Systems Group ATTN: Mr. W. W. Holbrook, General Manager Eastern Test and Engineering Operations 7800 Governors Drive Huntsville, Alabama 35807 ORGANIZATIONAL CONTACT: Mr. James Gleason, Manager, Nuclear Engineering TELEPHONE NUFPEP:
(20M M7-4411 NUCLEAR INDUSTRY ACTIVITY: Wyle Laboratories, Huntsville, Alabama, provides a variety of nuclear services to the industry including environmental cnd seismic qualification testing of safety-related equipment, refurbishment and recertification of valves, valve and component flov testing, and mechanical and hydraulic snubber testing, decontamination and repair.
ASSIGNED INSPECTOR:
b h
w S. D. Alexander Speciil Projects Tiispection unte Section (SPIS OTHERINSPECTCR(S):
2 APPROVED DY:
< l It w
7.wo f f U.'P6tapovs, Chit.
SPI (, Vendor Inspection Branch ate INSPECTION BASES AND SCOPE:
A.
BASES:
10 CFR Parts 21 and 50.49 and 10 CFR Part 50, Appendix B.
This inspectic' consisted of:
(1) a technical evaluation of h.
SCOPE:
n equipment qualification (EQ) test activities for safety-related equip-ment (2) examination of test setup and specimens and (3) veritying that specifications and applicable regulatory requirements were met.
=
PLANT SITE APPLICABILITY: Susquehanna 1/2(50-387/308), Dresden 2/3 249), LaSalle County Station 1/2(50-373/374), Byron 1/2(50-454/455)(50-237/
(continuedonnextpage).
999o0,N N E pg 2
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GRGANIZATION: KYLE LABORATORIES HUNTSVILLE, ALABAMA REPORT INSPECTION kh Q00A00n7/97 n1 prRill TS.
pang 9 nf d PLANT SITE APPLICABILITY:
(continued)Braidwood 1/2(50-456/457), Quad Cities 1/2 (50-254/265), and Zion 1/2(50-295/304).
A.
VIOLATIONS:
Ncne.
B.
NONCONFORMAf'CES:
None.
C.
UNRESOLVED ITEMS:
None.
D.
STATUS OF PREVIOUS INSPECTION FIhDINGS:
Not addressed during this inspection.
E.
OTHER FINDINGS AND COMME]ES,:
1.
Background.
In May 1986, Pennsylvania Power and Light Company TFPlL)installedMarathon1600TBsinLimitorquevalveactuators at Susquehanna Units 1 and 2 to replace unqualified tbs that were discovered during the licensee's followup inspections to IE Information Notice 66-03.
In September 1986, PP&L EQ personnel became aware that the 1600s (and 1500s) had failed in Marathon sponsored EQ tests at Wyle Laboratories (kyle Report No. 45603-1 dated February,1982). The samples had been thennally aged for 444 hours0.00514 days <br />0.123 hours <br />7.34127e-4 weeks <br />1.68942e-4 months <br /> at 246 F.
Failure occurred during loss-of-coolant-accident (LOCA) simulation at 365'F when the samples were energized with 520 Vac for an operability test using a motor external to the test chamber as a load.
The failure mode was shorting with the attendant inability to maintain the tbs energized at 526 Vac.
PPLL-sponsored testing of the 1600s was completed recently at Wyle for Susquehanna's drywell environment. These samples had been thermally aged for 185 hours0.00214 days <br />0.0514 hours <br />3.058862e-4 weeks <br />7.03925e-5 months <br /> at 248'F. Three Marathon 1600s were mounted in a NEMA-4 enclosure in the test chamber.
Failure occurred on one of the samples in this test during the LOCA exposure at 360*F when the samples were energized with 528 Vac for the first operability test following s aray initiation. The failure mode was a short circuit between t1e terminals of two
ORGANIZATION: WYLE LABORATORIES HUNTSVILLE, ALABAMA REPORT INSPECTION kn. oconnon?/A7_n1 RF91lf TS-PAnF 1 nf a phases and short circuits from at least one terminal to ground on the mounting panel of the test enclosure across the insulated base of the TB.
2.
Purpose. The purpose of this inspection was to gather information on the results of the above testing and environmental qualification testing of certain Amp Corporation electrical connector assemblies and Marathon Corporation terminal blocks performed by Wyle for the Commonwealth Edison Company.
3.
Review. The inspector reviewed documentation associated with the above testing, interviewed Wyle and Conmonwealth Edison technical personnel and examined the test specimens. Also examined was the Marathon terminal block test setup including the Loss-of-Coolant-Accident (LOCA) simulation chamber and the test NEMA enclosure in it; in which the three Marathon 1600 terminal block specimens were still mounted.
a.
The Marathon test setup consisted of a spraytight (but not steam-tight) steel electrical terminal block enclosure gounded to the LOCA chamber with 3 Marathon 1600s mounted on the inside of its back panel. The tbs were positioned as follows: two with their long axis oriented vertically mounted on either side of the center TB which had its long axis oriented horizontally.
The tbs were wired in series with three phases and leads from each one exiting the LCCA chamber such that they could be connected and disconnected externally and. independently for jumpering and or measurement of insulation resistance during the test. A 1-horsepower, 480 Vac, 3-phase motor was connected as a load for the operability checks.
Each phase was protected by a 12 amp fuse and there was a leakage current monitoring circuit protected by a 4 amp fuse. The power supply protective device was set for twice the locked-rotor current for the load motor at rated voltage. The acceptance criterion was that it should not trip. The center, horizontal TB was the one that
- failed the test.
It clearly showed signs of arcing from the energized terminals near the center of the block downward across the surface of the insulated base to the enclosure back panel at the lower side of the block base.
Review of the raw test data indicated that after the first six hours of steam exposure, chemical spray was initiated.
Less than one minute later, an operational accident performance test was initiated by energizing the tbs with 528 VAC. Within
ORGANIZATION: WYLE LABORATORIES HUNTSVILLE, ALABAVA REPORT INSPECTION Nn - Occnn407/R7-01 RESULTS*
PAGF 4 of 4 seconds of energization, the 12 amp fuses in two of three phases blew as well as the 4 amp fuse in the leakage current monitoring circuit, b.
Review of documentation associated with the CECO sponsored Wyle tests of the Amp connectors indicated that they had developed excessive leakage current during the test when energized with 132 VDC.
Examination of the test specimens of the nylon insulated crimp type butt-splice connectors (supplied with GE F01 electrical penetration assemblies) revealed clear signs of arcing through the connector insulation near one of the larger diameter end " bells" which accepts some of the wire insulation.
4.
Conclusions. The inspector's review confirmed that the testing had been conducted in accordance with specifications and regulatory requirements and that the testing was technicai 4-adequate for its intended purposes.
The inspector further concluded that the results demonstrated the inability of the Amp nylon insulated connectors and one of the Marathon 1600 terminal blocks to meet their specified functional performance requirements under the simulated accident conditions, and that the failures appeared to represent environmentally induced failures; thus rendering them unqualified for the applications for which they were tested.
The results of testing on the newer design, nuclear grade Amp connectors indicated that these connectors could be qualifed for the service and harsh environmental conditions under which they perfomed satisfactorily in the test.
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