ML20153G249
| ML20153G249 | |
| Person / Time | |
|---|---|
| Issue date: | 02/24/1986 |
| From: | Alexander S, Potapovs U NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| Shared Package | |
| ML20153G240 | List: |
| References | |
| REF-QA-99900277 NUDOCS 8602280167 | |
| Download: ML20153G249 (10) | |
Text
.-
THE ROCKBESTOS COMPANY ORGANIZATION:
NEW HAVEN, CONNECTICUT REPORT INSPECTION INSPECTION N0.: 99900277/86-01 DATE:
1/21-22/86 ON-SITE HOURS:
16 CORRESPONDENCE ADDRESS:
The Rockbestos Company A Member of the Marmon Group ATTN: Mr. R. S. Thayer General Manager Post Office Drawer 1102 New Haven, Connecticut 06504 ORGANIZATIONAL CONTACT: Mr. George Littlehales, QA Manager TELEPHONE NUMBER:
(203)772-2250 NUCLEAR INDUSTRY ACTIVITY:
Currently the testing laboratory at the New Haven plant conducts all thermal aging, loss-of-coolant accident (LOCA) simulations, post-LOCA sample evaluation testing, and flame testing for Class 1E (safety-related) electrical equipment qualification (EQ) on Rockbestos cable.
Nuclear related product manufacturing at the New Haven plant comprises approximately 5 percent of the plants total output.
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ASSIGNED INSPECTOR:
i S. D. Alexander, Equipment Qualification Inspection ae l
Section (EQIS)
OTHER INSPECTOR (S):
M. Jacobus, Sandia National Laboratories (SNL)
APPROVED BY:
il 1b ip 2-24-$
U. P~otapovs, Chief, EQIS] Vendor Program Branch Date INSPECTION BASES AND SCOPE:
A.
BASES:
B.
SCOPE: This inspection consisted of review of the status of the requal-ification program (RP) on currently manufactured Class 1E cable types.
Emphasis was on observing post-LOCA sample evaluation testing of RSS-6-100 series, adverse nuclear service coaxial, twinaxial and triaxial cable samples.
PLANT SITE APPLICABILITY:
San Onofre 1 (50-206); Haddam Neck (50-213); Nine Mile Point 1 (50-220); Dresden 2 (50-237); Millstone 1 (50-245); Dresden 3 (50-249); Turkey Point 3 and 4 (50-250/251); Palisades (50-255) (continued on next page) 0602280167 860226 PDR GA999 EMVROCK 99900277 PDR
(
ORGANIZATION: T'HE ROCKBESTOS COMPANY NEW HAVEN, CONNECTICUT REPORT INSPECTION NO.-
99900277/86-01 RESULTS:
PAGE 2 of 6 PLANT SITE APPLICABILITY:
(continued)
Monticello (50-263); Quad Cities 2(50-265); Point Beach 1 (50-266); Peach Botton 2 and 3 (50-277/278); Prarie Island 1 (50-282); Indian Point 3 (50-286); Pilgrim 1 (50-293); Zion 1 (50-295); Point Beach 2 (50-301);
Zion 2 (50-304); Kewaunee (50-305; Prarie Island 2 (50-306); Main Yankee (50-309); Arkansas 1 (50-313; Calvert Cliffs 1 and 2 (50-317/318);
Fitzpatrick (50-333); St. Lucie 1 (50-335); Millstone 2 (50-336); San Onofre 2 and 3 (50-361/362); Arkansas 2 (50-368); McGuire 1 (50-369); LaSalle 1 and 2 (50-373/374); Med. Coll. Hanover (50-377); St. Lucie 2 (50-389); Lacrosse (50-49); Nine Mile Point 2 (50-410); Catawba 1 and 2 (50-413/414); and WPSS-3 (50-508).
A.
VIOLATIONS:
None.
B.
NONCONFORMANCES:
None.
C.
UNRESOLVED ITEMS:
None.
O.
STATUS OF PREVIOUS INSPECTION FINDINGS:
1.
(0 pen) Nonconformances (84-02, Items B.1 and R.2; 83-03, Items B.1 - B.5):
The NRC inspector took no action on these production nonconformances during this inspection.
2.
(0 pen) Nonconformances (83-04, Item B.1 and B.2; 83-02, Item B.1 example (2); Unresolved Items 83-04, Item C; 83-03, Item C; 83-02, Item C.2; and Followup Item 81-01:
These items were recapitulated in inspection report 99900277/85-01.
They are under continuing review.
They will remain open until evaluation of the requalification program is completed and validity of prior tests affected by the items can be determined.
ORGANIZATION: THE ROCKBESTOS COMPANY NEW HAVEN, CONNECTICUT REPORT INSPECTION NO.-
99900277/86-01 RESULTS:
PAGE 3 of 6 E.
OTHER FINDINGS OR COMMENTS:
1.
During this inspection, the NRC inspectors reviewed corrective actions from previously identified nonconformances, reviewed data from test plan (TP) No. 5802 on RSS-6-100 series samples which had been generated since the last inspection, observed post-LOCA sample evaluation testing on these samples, and reviewed related documentation. While the NRC is following this program closely to verify compliance with regulatory requirements, the responsibility remains with individual licensees who intend to utilize the results of these tests in support of qualification to evaluate them with respect to the requirements of specific plant applications.
a.
The RSS-6-100 post-LOCA testing observed consisted of the following:
(1) Removal of samples from LOCA chamber and initial visual examination.
(2) Separation of samples and detailed visual examination.
(3) Straightening of samples, marking lengths to be immersed for the voltage withstand test.
(4) Coiling of samples on mandrels of a diameter equal to 40 times overall sample diameter and visual examination.
(5)
Immersion of samples in tap water, one hour soak, 80 VAC/ mil (of insulation wall thickness) voltage withstand test (dielectric proof test).
(6)
Insulation resistance (IR) tests.
(7) Close visual examination.
ORGANIZATION: THE ROCKBESTOS COMPANY NEW HAVEN, CONNECTICUT REPORT INSPECTION NO.*
99900277/86-01 RESULTS:
PAGE 4 of 6 b.
Test Results: The samples tested and the results of the dielectric withstand (DEWS) tests are as follows:
Thermal Sample Description Aging DEWS Al RSS-6-100A/LE Coaxial Aged Pass A3 RSS-6-100A/LE Coaxial Unaged Pass B2 RSS-6-104/LE Coaxial Aged Pass B4 RSS-6-104/LE Coaxial Unaged Pass C2 RSS-6-109/LE Triaxial Aged Fail C3 RSS-6-109/LE Triaxial Unaged Pass D1 RSS-6-112/LE Twinaxial Aged Conductor A Fail Conductor B Pass D3 RSS-6-112/LE Twinaxial Unaged Conductor A Pass Conductor B Pass E2 RSS-6-113/LE Coaxial Aged Pass E4 RSS-6-113/LE Coaxial Unaged Pass F2 RSS-6-110A/LE Coaxial Aged Pass F3 RSS-6-110A/LE Coaxial Unaged Pass G2 RSS-6-115/LE Triaxial Aged Pass G4 RSS-6-115/LE Triaxial Unaged Pass NOTE: All samples received 200 Mrads gamma radiation and thermal aging on two of each type was 120 hours0.00139 days <br />0.0333 hours <br />1.984127e-4 weeks <br />4.566e-5 months <br /> (dry oven) at 100 C.
With the samples in the DEWS tank, water was noted dripping from some of the cable ends. All of the coaxial cables held voltage throughout the test and passed the DEWS test.
Immediately prior to the DEWS on triaxial sample C2, its insulation resistance (IR) was checked with a digital ohmmeter and found to be about 30 kilohms. When the DEWS test was begun, the leakage current increased rapidly and tripped the current set.
Subsequent attempts to slowly apply the DEWS test voltage resulted in voltage up to about 1000 VAC (highest recorded) before tripping.
None of these attempts was successful.
The leakage current fluctuated radically at different voltages and different times, possibly indicating moisture in the cable. The IR after the DEWS attempt had increased to about 500 kilohms.
Similar behavior was observed for conductor A of twinaxial sample 01.
Before the DEWS, the IR was about 500 kilohms.
Several attempts got the voltage as high as 1100 VAC, and the final IR was about 1.5 megohms.
i ORGANIZATION: THE ROCKBESTOS COMPANY NEW HAVEN, CONNECTICUT REPORT INSPECTION NO.-
99900277/86-01 RESULTS:
PAGE 5 of 6 c.
Other Observations: The condition of the RSS-6-100 samples following qualification test series, most notably after the LOCA simulation, was similar to that observed in previous tests of this series. Detailed examination of the samples indicated deposits of a dark, powdery substance, particularly at points of contact between the cables and the mandrel. Some shallow indentations in the insulation of the cables where they rested on the mandrel were identified.
No other visible damage to cable insulation was found.
No nonconformances were identified during observation of this set of tests.
2.
The NRC inspectors reviewed qualification test plan TP 5802, Rev. 3 for Rockbestos adverse service coaxial, twinaxial, and triaxial RSS-6-100 series cables. The following comments pertain to the documents examined:
6 a.
TP p. 6: TP5802specifiesIRgaluesof10 megohms /1000 ft.
for B and C sample types and 10 megohms /1000 ft for the rest.
With ly ft, sgmples, it will be necessary to measure values in the 10 to 10 megohm range to demonstrate conformance to this specification.
Rockbestos is reevaluating the specification, b.
TP p. 7: Sandia National Laboratories Report, SAND 81-2027/
1 of 2, was cited to support the assertion that synergistic effects of simultaneous radiation and thermal aging have been considered and comparable results would be obtained in using simultaneous or sequential radiation and thermal aging with either sequence.
c.
TP p. 11:
Soak time specifications omitted from the previous revision of the TP were included in the current revision, d.
TP p. 24: The specification for LOCA chemical spray flowrate was given as 15 gpm instead of the correct value of 1.5 gpm.
This error was corrected in the current revision to TP 5802.
e.
The documentation included aging calculations which used an activitation energy of 2.75 eV for the type KXL-100 radiation cross-linked polyethylene cable insulation.
The inspector verified that the aging calculations were correct for the values used, and that the testing used as a basis for the calculations was applicable to the cable currently being tested.
e 4
ORGANIZATION: THE ROCKBESTOS COMPANY NEW HAVEN, CONNECTICUT REPORT INSPECTICN NO.-
99900277/86-01 RESULTS:
PAGE 6 of 6 3.
Review of Test Data The test data generated for TP 5802 prior to the inspection was reviewed. The two samples which failed the DEWS test had not held voltage throughout the post-LOCA exposure. Sample C2 held voltage for about 40 days and sample 01 held voltage for about 65 days.
irs prior to and during the test ranged as follows:
Temperature ( F)
IR Range (megohms) 6 Ambient prior to test 0.7 - 5.0 X 10 342 12 - 94 322 28 - 180 302 64 - 350 251 560 - 2600 3
227 1.7 - 14 X 10 The two sequential ramp times were similar at about twelve reconds to 280*F and forty-five seconds to 370 F.
During the first ramp, two voltage sets tripped and would not reset. The lead wires were found shorted to the autoclave due to insulation damage resulting from a pressure extrusion. They were replaced prior to the second ramp.
4.
Failure Analysis Rockbestos is investigating the DEWS test anomalies, i.e., failure of this test by Sample C2 and conductor A of Sample D1.
Preliminary indications are that the samples contained moisture. The intrusion is presently believed to be attributed to insulation damage during test pressure extrusions and subsequent repairs.
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