Morning Report for May 20, 2003
Headquarters Daily Report
MAY 20, 2003
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REPORT NEGATIVE
ATTACHED INPUT RECEIVED
HEADQUARTERS X
REGION I X
REGION II X
REGION III X
REGION IV X
PRIORITY ATTENTION REQUIRED MORNING REPORT - REGION IV MAY 20, 2003
Licensee/Facility: Notification:
Houston Lighting & Power Co. MR Number: 4-03-0002
South Texas 1 Date: 05/20/03
Wadsworth,Texas SPECIAL INSPECTION TEAM LEADER
Dockets: 50-498
PWR/W-4-LP
Subject: SOUTH TEXAS PROJECT BOTTOM MOUNTED INSTRUMENTATION PENETRATIONS
-PRELIMINARY EXAMINATION RESULTS
Discussion:
This morning report provides a preliminary update of the initial
examination results of the leaking bottom mounted instrumentation (BMI)
penetrations at South Texas Project, Unit 1 (STP-1).
The licensee has begun examination of the STP-1 BMI penetrations.
Nondestructive examination (NDE) techniques currently in use include
visual examination of the j-groove welds and ultrasonic (UT) examination
using probes that travel inside the nozzles.
Examinations have been performed of the two BMI penetrations (Nos. 1 and
46) identified with boric acid on the exterior surface of the reactor
vessel. Results of the ultrasonic examination of each of these
penetrations show the presence of axially-oriented indications in the
nozzle wall in the vicinity of the j-groove weld that are likely the
source of the observed leakage. No indications were identified on the
crown of the j-groove weld by the visual examination for either of these
penetrations. The licensee plans additional examinations to further
characterize the indications and provide additional information for
analyses to determine the root cause of this condition.
Nondestructive examinations are in progress for the remaining STP-1 BMI
penetrations.
Regional Action:
The NRC Special Inspection Team including NRC inspectors and a consultant
NDE expert have been onsite monitoring the licensee's examinations and
independently reviewing data. The Special Inspection Team will continue
with observations of licensee examinations and evaluation of results.
Contact: DWIGHT CHAMBERLAIN (817)860-8180
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