United States Nuclear Regulatory Commission - Protecting People and the Environment

Morning Report for April 9, 1999

                       Headquarters Daily Report

                         APRIL 09, 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 APRIL  9, 1999

Licensee/Facility:                     Notification:

Part 21 Database                       MR Number: H-99-0032
Bw/Ip                                  Date: 04/09/99


Subject: Part 21 - Scram Discharge Volume Drain Valve Stroke Timing
         Failures


Discussion:

VENDOR: BW/IP                           PT21 FILE NO: 99-18-0

DATE OF DOCUMENT: 02/10/99              ACCESSION NUMBER:

SOURCE DOCUMENT: LER 271/98-025-01      REVIEWER: PECB, D. Skeen


NEW ISSUE. On December 7, 1998, during a quarterly surveillance, a scram
discharge volume (SDV) drain valve failed to close at Vermont Yankee. It
was refurbished, tested, and returned to service on December 10, 1998. On
December 11, 1998, during accelerated testing of other SDV drain valves,
two more were found that did not meet stroke time requirements of the
inservice testing program (see Licensee Event Report 50-271/98-025-01).
The licensee reports that the root cause of these failures appears to be
an inadequate actuator sizing calculation for the design conditions
specified in the licensee's procurement specification. The valve and
actuator were supplied by BW/IP International, Inc., Valve Division, of
Williamsport PA. The licensee replaced all the valve actuators in this
system with larger actuators and is addressing questions regarding the
vendor's quality assurance program.

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REGION III  MORNING REPORT     PAGE  2          APRIL  9, 1999

Licensee/Facility:                     Notification:

Commonwealth Edison Co.                MR Number: 3-99-0027
Braidwood 1                            Date: 04/08/99
Braceville,Illinois                    SRI/RI PC
Dockets: 50-456
PWR/W-4-LP

Subject: Change in Status of Braidwood Unit 1

Discussion:

 On April 5, at approximately 2:00 a.m., operators at ComEds Braidwood
Station commenced a Unit 1 shutdown following a failure of a rupture disc
on the Unit 1 heater drain tank. The turbine generator breaker was opened
at 9:30 am, April 5, 1999, and the reactor was shutdown at 11:00 am,
April 5, 1999. The shutdown was observed by the resident inspectors. An
investigation into the cause of the rupture disc was initiated. On April
8, after relocating the rupture disc to a different section of the
piping, a startup of the unit was commenced. Plant return to service is
expected the evening of April 8, 1999.

Contact:  Michael Jordan             (630)829-9637
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