Headquarters Daily Report
MARCH 07, 2001
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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 MARCH 7, 2001
Licensee/Facility: Notification:
MR Number: H-01-0016
Flowserve Date: 03/07/01
Subject: Part 21 - Broken Cap Screw Prevents Turbine-Driven Auxilliary
Feedwater Pump From Starting
Reportable Event Number: 37703
Discussion:
VENDOR: Flowserve PT21 FILE NO: m1-10-0
DATE OF DOCUMENT: 01/31/01 ACCESSION NUMBER: ml010450096
SOURCE DOCUMENT: EN 37703 REVIEWER: T. Koshy, REXB
The Beaver Valley Unit 1 licensee reported that a steam-driven auxiliary
feedwater pump failed to start from breakage of a cap screw on the collar
of the hydraulic balancing drum. The head of the screw became lodged
between the stuffing box extension and the collar, preventing the pump
from starting. The licensee determined the cause of the failure to be a
manufacturing defect, which propagated due to tensile stress and hydrogen
absorption at the tip of the crack.
The licensee stated that only one of the four cap screws installed in the
pump contained material defects, though the licensee identified
deficiencies with respect to the purchase order related to material
composition and hardness for all four screws.
Cap screws were initially provided as part of a new pump rotating
assembly purchased in 1990 from Ingersoll-Dresser Pump Company (now
Flowserve Corporation). In 1991, the licensee changed the pump internals
to stainless steel, based on an Ingersoll-Rand Part 21 notification (see
Part 21 91-09-0, dated September 19, 1991, accession number 9110100007,
and NRC Information Notice 88-87, "Pump Wear and Foreign Objects in Plant
Piping Systems," November 16, 1988).
The NRC will post ensuing reports on this subject on its Web site at
http://www.nrc.gov/NRC/PUBLIC/PART21/2001.
Contact: T. Koshy
Email: txk@nrc.gov
301-415-1176
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REGION IV MORNING REPORT PAGE 2 MARCH 7, 2001
Licensee/Facility: Notification:
Nebraska Public Power District MR Number: 4-01-0002
Cooper 1 Date: 03/07/01
Brownville,Nebraska Resident Inspectors
Dockets: 50-298
BWR/GE-4
Subject: UPDATE - LEVEL CONTROL PROBLEMS FOLLOWING REACTOR SCRAM AT
COOPER (Event 37805)
Discussion:
This morning report is being updated to correct technical information
related to the availability of the reactor feedwater pumps and to supply
additional information about the licensee response.
Following the automatic trip of reactor feedwater Pump B, the pump would
not restart when operators attempted to return it to service. When
operators started reactor feedwater Pump A, it exhibited higher than
normal vibration. The operators returned reactor feedwater Pump A to
standby and initiated the reactor core isolation cooling pump to supply
water to the reactor coolant system.
The licensee is conducting a human performance review to gain a better
understanding of licensed operator performance during the event response.
Regional Action:
The senior resident inspector was onsite for most of the event. Following
the stabilization of reactor parameters, the resident inspectors provided
continuous onsite coverage until the reactor reached cold shutdown. The
NRC senior risk analysts have evaluated the risk and concluded that no
special inspection efforts are warranted. The resident inspectors will
monitor licensee actions.
Contact: David Loveless (817)860-8161
Charles Marschall (817)860-8185
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