ML20069G685
| ML20069G685 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 03/21/1983 |
| From: | Maurin L LOUISIANA POWER & LIGHT CO. |
| To: | Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, 70, W3I83-0088, W3I83-88, NUDOCS 8303280124 | |
| Download: ML20069G685 (2) | |
Text
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9 I 0UISiANA f 242 OstAnONOe s1nter POW E A & L1G H T/ P O BOX 6008. NEW ORLEANS. LOUISIANA 70174. (504) 366-2345 ETTON s*vsSE March 21, 1983
- t. v. uAunin Vice President Nuclear Operations W3I83-0088 Q-3-A35.07.70 Mr. John T. Collins, Pegional Administrator s
Region IV
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E U. S. Nuclear Regulatory G. m ission
'l 611 Ryan Plaza Drive, Suite 1000 i
IL %2 sigs Arlington, Texas 76012 9
SUBJECT:
Waterford SES Unit No. 3 Docket No. 50-382 u
First Interim Report Significant Construction Deficiency No. 70 "GE 480-V SC Trip Coils Do Not Drop Out After Tripping"
REFERENCE:
Telecon dated February 18, 1983, M. A. Livesay to L. Martin
Dear Mr. Collins:
In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Interim Report of Significant Construction Def" lency No. 70, "GE 480-V SG Trip Coils Do Not Dr7p Out After Tripping".
If you have any questions, please advise.
Very truly yours, t
' l Y.
///tre L. V. Maurin LVM/ MAL:keh Attachment cc:
- 1) Director 3)
Mr. E. L. Blake Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.
20555
- 2) Director 4)
Mr. W. M. Stevenson Office of Management Information and Program Control U. S. Nuclear Regulatory Commission
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Washington, D. C.
20555 n
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'k, V 8303280124 830321 PDR ADOCK 05000382
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O INTERIM REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY REPORT NO. 70 GE 480 VOLT SWITCHGEAR TRIP COILS DO NOT DROP OUT AFTER TRIPPING INTRODUCTION This report is submitted pursuant to 10CFR50.55(e). It describes a deficiency in the control circuits of 480 volt switchgear breakers. This problem is considered reportable under the requirements of 10CFR50.55(e).
To the best of our knowledge, this problem has not been identified to the Nuclear Regulatory Commission pursuant to 10CFR21.
DESCRIPTION,0F PROBLEM During preoperational testing of the pressurizer heater circuits, some of the 480 volt switchgear breakers failed to reclose after tripping.
It has been determined that the green light circuits which monitor trip cell continuity were allowing excessive current to flow through the coils after tripping.
This prevented them from dropping out and dis,1 bled the closing mechanism.
The following switchgear utilize control circuits which have this problem:
3A21 3B21 3A31-S 3h31-S 3AB31-S 3A32 3B32 3A22 3P22 SAFETY IMPLICATIONS It has been determined that this trip coil circuit design could render inoperative safety related equipment required for safe shutdown of the plant if left uncorrected.
CORRECTIVE ACTION Nonconformance Report No. W3-5737 was initiated to impleme4t corrcctive action in accordance with revised design documents which remove the capability to pass current through the trip coils after tripping and therefore allow for proper breaker closing action.
Further information will be submitted to the USNRC no later than May 10, 1983.