ML20062J243
| ML20062J243 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 08/13/1980 |
| From: | Russell L BALTIMORE GAS & ELECTRIC CO. |
| To: | |
| References | |
| NUDOCS 8009190665 | |
| Download: ML20062J243 (1) | |
Text
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NA k 13 August 13, 1980 i
TD:
Mr. Boyce H. Grier. Director Region I. U.S. Nuclear Regulatory Consission FROM:
L. B. Russell P t Superintendent Calvert Cliff ar Power Plant Docket No.
o'ation of Technical Specification 3.7.4.1 LER No. 80-41, 317;'
SUBJECT:
This report is to confirm our-verbal-naification-to-Mr.-Ralph Architzel. '
of your office, of a condition dich touTd have preventes sne--mt::m..__Z_
of-the functional requirement of the service water system (T.S. 3.7.4.1) at Calvert Cliffs Unit One as required by Technical Specification 6.g.1.8.e (Prompt Notification with written follow-up). The event and cause
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" descriptions are as folloirTs 12, 1980, with Unit 'One operating at 2005 power indicated At 0700 on August level le both #11 and #12 service Water (SRW) head tanks went from normal operating level to full. About five (5) minutes later an isophase bus duct cooling low ficw alarm was received. The Shift Supervisor insnediately
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suspected that air was being introduced into the system.
A subsequent investigation revealed that #11 Instrument Air Ccapressor After Cooler had failed causing air ingress to both service water subsystems.- With both subsystems in operation the automatic vents provided adequate air removal.
capability to inwre system operability. System pressure did not drop below the nonnal operating band in either subsystem during the eve 9t.
After ill Instrument Air Compressor Air Cooler was isolated, the service LER 80-27 (U-1) water system was restored to normal operation at 0800.
l describes a similar event.
l More complete details as to the cause of the tube failure will be contained in the follow-uc report. -
oeE L. B. Russe 11' Plant Superintendent LBR/SMD/gla L. S. Russell cc:
Director, Office of Management Information & Program Control
- 5. M. Davis J. A. Tiernan R. M. Douglass R. E. Architzel 8009190 -((5 S
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