Headquarters Daily Report
JANUARY 19, 1999
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REPORT NEGATIVE NO INPUT
ATTACHED INPUT RECEIVED RECEIVED
HEADQUARTERS X
REGION I X
REGION II X
REGION III X
REGION IV X
PRIORITY ATTENTION REQUIRED MORNING REPORT - HEADQUARTERS JANUARY 19, 1999
MR Number: H-99-0001
NRR DAILY REPORT ITEM
GENERIC COMMUNICATIONS
Subject: GENERIC LETTER 98-01, SUPPLEMENT 1 ISSUED
NRC Generic Letter No. 98-01, Supplement 1: Year 2000 Readiness of
Computer Systems at Nuclear Power Plants, Dated January 14, 1999
The U. S. Nuclear Regulatory Commission issued this generic letter
supplement to provide addresses with a voluntary alternative response to
that required in Generic Letter 98-01 on Year 2000 (Y2K) readiness of
their respective facilities.
Technical Contact: Matt Chiramal, NRR
301-415-2845
E-Mail: mxc@nrc.gov
Lead Project Manager: Allen G. Hansen, NRR
301-415-1390
E-Mail: agh@nrc.gov
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REGION III MORNING REPORT PAGE 2 JANUARY 19, 1999
Licensee/Facility: Notification:
Commonwealth Edison Co. MR Number: 3-99-0003
Braidwood 1 Date: 01/19/99
Braceville,Illinois Licensee via ENS
Dockets: 50-456
PWR/W-4-LP
Subject: LOSS OF APPROXIMATELY 35 PERCENT OF CONTROL ROOM ANNUNCIATORS
Discussion:
ComEd's Braidwood Station Unit 1 experienced a loss of approximately 35
percent of the control room safety related annunciators when redundant
power supplies failed. Upon recognition, the licensee declared an unusual
event at 8:17 p.m. on 1/18/99, made the appropriate 10 CFR 50.72
notification, and summoned the proper people to the site for trouble
shooting and repair.
One power supply rectifier failed on 1/17/99 and the licensee was
preparing to conduct repairs and the second rectifier failed on 1/18/99.
The second power supply failure was identified when operators were
investigating a turbine supervisory alarm and found that the alarm system
was not behaving as expected. The second failed power supply is the
backup to the first failed power supply. Additional operators were
assigned to Unit 1 to monitor the plant and no indications were lost.
When the failed power supply rectifiers were identified, they were
replaced, the system was tested and returned to service.
At 4:07 a.m. on 1/19/99, the unusual event was terminated.
The licensee is continuing to investigate the cause of the failures.
Regional Action:
The resident inspectors are following the licensees investigation.
Contact: Michael Jordan (630)829-9637
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