ML20039C312
| ML20039C312 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 12/21/1981 |
| From: | Curtis N PENNSYLVANIA POWER & LIGHT CO. |
| To: | Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| REF-PT21-81 10CFR-050.55E, 10CFR-50.55E, PLA-980, NUDOCS 8112290215 | |
| Download: ML20039C312 (3) | |
Text
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(@ Pennsylvania Power & Light Company Two North Ninth Street
- Allentown. PA 18101 + 215 f 7705151 Norman W. Curtis 2%
Vice President-Engineering & Construction-Nuclear N
215 / 770-5381
/
f RECEIVED December 21, 1981 si DEC2 81981> 9
', gags gf Mr. R. C. Hajnes I4 Y
C3 Directar, Region I U. S. Nuclear Regulatory Commission N
631 Park Avenue g
King of Prussia, PA 19406 SUSQUEHA! CIA STEAM ELECTRIC STATION FINAL REPORT OF A DEFICIENCY INV0'Ji1NG DEFECTS IN SINGLE AND DUAL ALARM UNITS ER 100450 FILE 840-04/821-10 PLA-980
Dear Mr. Haynes:
This letter serves to provide the Commission with a final report on a deficiency involving defects in Bailey Controls Co. single and dual alarm units Model 745.
This deficiency was previously disclosed to the Commission during a meeting between Mr. A. R. Sabol and Mr. E. C. McCabe of NRC Region I on November 20, 1981.
The attachment to this letter contains a description of the A ficiencv, its cause, an analysis of safety implications and the corrective action taken and planned. This information is furnished pursuant to the provisions of 10 CFR 50.55 (e).
Since the details of this report provide infomation relevant to the reporting requirements of 10 CFR 21, this correspondence is considered to also discharge any fomal responsibility PP&L may have in compliance thereto.
We trust the Commission will find this report to be satisfactory.
Very truly yours, s'9 f\\
i
<s J
N. W. Curtis Vice President-Engineering & Construction-Muclear
')
- **^D 8112290215 811221 I/
PDR ADOCK 05000387 Attachment S ppg i
December 21, 1981 2
SSES PLA-980 ER 100450 840-4/821-10 Mr. R. C. Haynes cc Mr. Victor Stello (15 copies)
Director-Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. G. Mcdonald, Director (1)
Office of Management Infomation & Program Control U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. Gary Rhoads U. S. Nuclear Regulatory Commission P. O. Box 52 Shickshinny, PA 18655 i
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ATTACHMENT TO PLA-980 FINAL REPORT
SUBJECT:
Bailey Controls Co. Model 745, Series 7000N, single and dual alarm unit printed circuit boards.
DESCRIPTION:
Bailey Controls Co. has determined that a defect may exist which could create poor electrical contact between rack-mounted type female connectors and the mating gold plated fingers of certain Model 745 single and dual alarm printed circuit boards.
i The defect is the existence of excessive misalignment in the location of the gold plated contact " fingers" in the male connector. A typical male connector should exhibit symmetry of edge of gold finger to edge of board connector tab to within 1/64" manximum. Misalignment of the contact fingers, which are designed to mate with the rack mounted female plug connector, can cause electrical circuits to be opened on a permanent or intQrmittent basis.
CAUSE:
The existence of this potential defect was identified to PP&L by correspondence received from Bailey Controls Co.
This correspondence did not address the cause of this manufacturing related defect, therefore the cause is indeterminate.
ANALYSIS OF SAFETY IMPLICATIONS:
The alarm units in question will be used in the safety related HVAC system in connection with damper and fan control. Feilure to make proper electrical contact could cause loss of control of this equipment. This circumstance could prevent the proper functioning of the safety related HVAC systems used to control environmental conditions in sensitive areas or to control / limit the spread of radioactive contamination.
PP&L Engineering considers the malfunction or loss of the safety related HVAC system a situation that could adversely affect the safe operation of the plant.
Therefore, the potential loss of electrical contact between the male-to-female Bailey Controls Co. connectors is considered a significant deficiency, reportable under 10 CFR 50.55(e).
CORRECTIVE ACTION:
Bailey Controls Co. has issued Safety' Concern Report SCR-027 as instructions to inspect the Model 745 single and, dual alarm products to determine if the potential problem exists at SSES..Where defective units are identified replace-ment units and appropriate Quality'hssurance documentation will be obtained.
The alarm units supplied to PP&L were examined according to the criteria specified by Bailey Controls Co. under Bechtel NCR No. 8300. Of 48 units requiring inspection, twelve were found to be defective and have been returned to Bailey.
Replacement units will be supplied for installation prior to fuel load. The replacement units will be inspected for conformance to Bailey Criteria prior to installation in SSES.
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