ML20040B237
| ML20040B237 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 12/31/1981 |
| From: | Curtis N PENNSYLVANIA POWER & LIGHT CO. |
| To: | Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| REF-PT21-81 100450, 10CFR-050.55E, 10CFR-50.55E, ER-100450, ER-100508, IEIN-81-01, IEIN-81-1, PLA-990, NUDOCS 8201250298 | |
| Download: ML20040B237 (5) | |
Text
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@) Pennsylvania Power & Light Company Two florth thoth Street
- Allentown, PA 18101 + 21517705151 f.orman W. Curtis Vice Prosident-Engmocring & Construction-Hucioar 215 / 770-S381 December 31, 1981
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FI!iAL PEPORT OF A DEFICIEtJCY I!!VOLVIllG gp GE IIFA PELAYS Y
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FA 100450/100508 FILES 840-4/821-10
-PLA-990 Poference:
PLA-708 dated April 3,
1981
Dear for. if aynes :
This letter serves to provide the Commission with a final report on the deficiency involving GE ilFA helays.
This deficiency was originally reported by telephone to Mr. R. T. Carlson of fiPC Pegion I by Mr. A.
Sabol of PP&L on February 6, 1981. The referenced letter provided the Commissien with an interin report on the subject deficiency.
The attachment to thiu letter contains a description of the problem, its cause, nafets/ implications, and corrective action taken and planned. This information is provided pursuant to the provisions of 10 CFR 50.55(e).
Since the details of this report provide information relevant to the reporting requirements of 10 CFP 21, this corre_pondence is considered to also discharge any formal responsibility PP&L may have in ecmpliance thereto.
We trust the Commission will find this report to be satisfactory.
Very truly yc>urs,
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V fl. W. Curtin Vice President-Engineering & Construction-fluclear JS:jmk Attachment i
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December 31, 1981 SSES PLA-990
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821-10
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Mr. Richard C. DeYoung (15 copies)
Director-Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. G. Mcdonald, Director (1)
Office of Management Information & Program Control i
U. S. Nuclear Regulatory Commission Washington, D.C.
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Mr. Gary Rhoads U.
S. Nuclear Regulatory Commission P.O. Box 52 Shickshinny, PA 18655 I
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, SSES PLA-990 December 31, 1981 100450/100508 840-4/
821-10 i
Subject General Electric IIFA Relay defective coil spools.
Description This deficiency involves the susceptability of General Electric HFA Relay Lexan Coil spools to cracking and subsequent breakage. This problem was first identified in NRC Information Notice 81-01.
The concern is that surface cracks could ultimately deteriorate intc a broken spool such that relay actuation could be blocked by the resultant debris.
Ilistorically, a number of failures have been connected with the HFA class of relay.
In April 1976, G.E.
issued Service Advice PSM 152.1 to notify all users of HFA relays that a number of black Lexan coil spools had been found cracked by a customer and that the problem was traced to improper mixing of the black Lexan.
More recently, NRC Information Notice 81-01 was issued in January 1981, which identified the concern over the cracking of clear Lexan spools.
General Electric issued Service Information Letter SIL No. 44, Supp. 2, in February 1981, which identified a test procedure and suggested frequency of tests to verify the integrity of the clear Lexan coil spools.
To determine the condition of the HFA relay coil spools in the General Electric scope of supply, an inspection by G.E.
(San Jose) representatives was conducted on January 30, 1981. This inspection was conducted on the Unit 2 systems only in accordance with G.E. FDI MDEP.
The inspection Yesulted in the discovery of 16 broken coil spools and 65 cracked coil spools out of a total of 358 checked.
Cause General Electric has performed a series of accelerated aging tests on Lexan coils to determine if the cracks in the Lexan will propagate over time.
These tests were recently completed and did verify that cracks will pro-pagate in the surface of the Lexan. No cause, however, was determined for the propagation of the cracks.
It was noted that the reason for the cracking was not due to exposure of the Lexan to hydrocarbons, as was reported in NRC I&E Information Notice 81-01.
Analysis of Safety Implications llFA relays are used in many plant safety and non-safety systems in both the NSSS and BOP scope.
In anlayzing the safety implications of the coil spool breakage, the results of the G.E. Inspection conducted under FDI-MDEP were evaluated. The 16 broken liFA relay coil spools were located in the Peactor Protection System,liigh Pressure Coolant Injection, Nuclear Steam Supply Shutoff and Core Spray Systems. One particular relay in the Core Spray System, E21A-K13B, is used to control circuits in the outboard and inboard injection shutoff valves 2F004B and 2F005B.
If this relay becomes inoperable
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. SSES PLA-990 ecember 31, 1981 100450/100508 840-4/
821-10 by postulating that a broken coil fragment becomes wedged in the relay mechanism, the "B"
loop of the Core Spray System would be inoperable.
In addition, if a single failure of a deisel-generator designed to provide power to the "A"
loop of the Core Spray System occurred, inadequate core cooling could result. Many other HFA relays are used in safety systems but were not analyzed.
Based on the above analysis, the defective HFA relays are considered to be reportable under the provisions of 10 CFR 50.55(e).
Corrective Action In March 1981, PP&L commenced development and scheduling of a replacement program for all HFA relays in Unit 1 and Common. The basic purpose of this program was to replace all Lexan coil spools in HFA relays with the newer Tefzel coil spool. Because of the difference in contract specifications and vendor warranty applicable to the MSSS and BOP systems, the program was divided into two parts:
1.
For the NSSS Scope of Supply, G.E.
(San Jose) committed to supply new Tefzel coils for all HFA relays.
In addition, G.E. issued FDI-WJKI in May 1981, which identified the procedure for replacement of the 375 coils in Unit 1 and Common Systems. This replacement program was completed in November 1981.
In conjunction with this effort, General Electric (San Jose) has recently completed a qualification program of the modified relays which qualifies them to the latest environmental specifications.
2.
For the BOP Scope of Supply, PP&L commenced a replacement program of all Class lE HFA relays with the newer Century Series HFA relays which contain the Tefzel coil spool. The relay replacement prooram is still.in process and will be completed prior to Unit 1 fuel load. An inspection of all the BOP non-Class lE HFA relay coils has been conducted and any coils found defective have been replaced with a Tefzel coil.
Bechtel has been directed to perform the same replacement programs on Unit 2 HPA relays with the exception that on the BOP Scope of Supply, all Class lE HFA relays and non-Class 1E relays will be equipped with the new Tefzel coil.
Conclusion The replacement of the Lexan coils with the newer Tefzel coil in all Class 1E HFA relays and the inspection and replacement of all defective Lexan coils in non-Class lE HFA relays will prevent any coil failures in an HFA relay from causing a detrimental effect on plant operations. This recponse is in accordance with the guidelines provided by G.E.
l Based on the analysis of safety implications, the HFA relays are considered to be reportable under the provisions of 10 CFR 50.55(e).
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