Headquarters Daily Report
MARCH 01, 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 1, 2001
MR Number: H-01-0014
NRR DAILY REPORT ITEM
GENERIC COMMUNICATIONS
Subject: Issuance of Information Notice 2000-17, Supplement 2
NRC Information Notice 2000-17,Supplement 2: Crack in Weld Area of
Reactor Coolant System Hot Leg Piping at V. C. Summer,
dated February 28, 2001
The U.S. Nuclear Regulatory Commission is issuing this information notice
(IN) supplement to provide updated information about the crack found in a
weld in the A loop hot leg pipe in the reactor coolant system (RCS) at
the V. C. Summer Nuclear Station.
Technical contacts: Eric Benner, NRR Billy Crowley, Region II
301-415- 1171 404-562-4612
E-mail: ejb1@nrc.gov E-mail: brc@nrc.gov
C. E. Carpenter, NRR
301-415-2169
E-mail:cec@nrc.gov
Accession No. ML010570353
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HEADQUARTERS MORNING REPORT PAGE 2 MARCH 1, 2001
Licensee/Facility: Notification:
Summer Carolina Electric & Gas Co. MR Number: H-01-0015
Summer Unit 1 Date: 03/01/01
South Carolina
Subject: Part 21 - Internal Binding of the Terminal Shaft in Woodward EGB
Hydraulic Actuators
Discussion:
VENDOR: Summer PT21 FILE NO: m1-11-0
DATE OF DOCUMENT: 02/28/01 ACCESSION NUMBER:
SOURCE DOCUMENT: EN 37788 REVIEWER: REXB, D. Skeen
The Summer licensee reported internal binding of a terminal shaft on a
Woodward Type EGB hydraulic actuator unit on an emergency diesel
generator (EDG). On 12 /21/00, after a full load surveillance run, the A
EDG experienced load swings and frequency oscillations when the output
breaker was opened. The EGA electronic control unit and EGB hydraulic
actuator were replaced with components from the licensee's warehouse. A
1.5 hour surveillance run yielded satisfactory results. A second 1.5 run
was made to verify satisfactory performance. During the second run,
moderate frequency oscillations were observed when the output breaker was
opened. The licensee installed monitoring instrumentation and performed a
third run. Severe frequency oscillations (from full fuel to no fuel)
occurred on the third run. Even with the EGA control unit disconnected,
the EGB actuator could not be stabilized. The licensee removed the EGB
actuator and sent it to B.F. Goodrich/Fairbanks Morse (the EDG
manufacturer) for evaluation.
Subsequent investigation by B.F. Goodrich/Fairbanks Morse determined that
the binding was caused by clamping screws that were 1/8-inch longer than
those specified by the governor vendor (Woodward). The licensee stated
that the error was made during refurbishment of the EGB unit by Engine
Systems, Incorporated (ESI), on 2/24/00. The licensee replaced the EGB
units on both emergency diesel generators with units refurbished by B.F.
Goodrich/Fairbanks Morse.
The NRC will post ensuing reports on this subject on its Web site at
http://www.nrc.gov/NRC/PUBLIC/PART21/2001.
Contact: Dave Skeen, NRR
301-415-1174
dls@nrc.gov
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