ML19332D287
| ML19332D287 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 11/24/1989 |
| From: | Haughney C Office of Nuclear Reactor Regulation |
| To: | Rossi C Office of Nuclear Reactor Regulation |
| References | |
| OREM-89-040, OREM-89-40, NUDOCS 8911300276 | |
| Download: ML19332D287 (12) | |
Text
_ --
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November _ 24, 1989 er y
, MEMORANDUM FOR:
Charles E. Rossi, Director Division of Operational-Events Assessment FROM:
Charles J. Haughney, Chief Events Assessment Branch Division of Operational Events Assessment
SUBJECT:
THE OPERATING REACTORS EVENTS NEETING November 22, 1989 - MEETING 89-40 On November 22, 1989, we conducted an Operating Reactors Events meeting
^
(89-40) to brief senior managers from NRR, ACRS, Commission staff, and regional offices on selected events that occurred since our last meeting on November 15, 1989. lists the attendees.
L. presents the significant riements of the discussed events. contains a summary of reactar scrams for the weeks ending 11/19/89.. No significant events were identified for input into the NRC performance indicator program.
Origine.1 signed by:
Charlos J. Hauchncy Charles J. Haughney, Chief Events Assessment Branch Division of Operational Events Assessment
Enclosures:
As stated cc w/ Encl.:
L See Next Page 1
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November 24,'1989 p
4 MEMORANDUM FOR:
Charles E. Rossi, Director Division of Operational Events Assessment FROM:
Charles J. Haughney, Chief C
Events Assessment Branch Division of Operational Events Assessment
SUBJECT:
THE OPERATING REACTORS EVENTS ME ING November 22, 1989 - MEETING 89-ember 22, 1989, we conducted an Operating Reactors Events meeting On Nov,4 to brief senior managers from NRR, ACRS, Commission staff, and (89-4 regio {nalofficesonselectedeventsthatoccurredsinceourlastmeeting
- on November 15, 1989. Enclosure 1 lists the attendees.
~
- Enclosure 2 presents the significant elements of the discussed events. ' contains a summary of reactor scrams for the weeks ending
. 11/19/89. No significant events were identified for input into the NRC performance indicator program.
Y
_ sp f 2_
A Ev A se sment ra c Division of Operational Events Assessment
Enclosures:
As stated cc w/ Encl.:
See Next Page l.
l.'
i: 'J.a J. : Y.
H
.cc:'
- T. Murley, NRRX A. Wang..NRR F. Miraglia, NRR J. Stolz, NRR J. Sniezek, NRR a-J._Partlow, NRR-l E. Jordan, AEOD-
- J. L Taylor, EDO -
E. BeckJord, RES W. Russell..RI S. Ebneter, RII:
B. Davis, RIII R.D. Martin, RIV J.B. Martin,- RV -
W. Kane. RI L. Reyes,'RII e
E. Greenman _RIII-
~
J. Milhoan, RIV R. Zimmerman, RV-S.' Varga,- NRR-B. Boger, NRR G. Lainas..NRR G. Holahan, NRR e
F. Congel, NRR E. Weiss, AEOD B.: Clayton, ED0 -
J. Lieberman, OE J. Guttmann, SECY
- A. Thadani,: NRR' J. Richardson, NRR
.S.= Rubin, AE0D J.~ Forsyth, INP0
>lR. Barrett, NRR
~!
.M. Harper, AE00.
R..Newlin, GPA l
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.J.
Roe, NRR p
H. Alderman, ACRS 4
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ENCLOSURE 1 e
LIST OF ATTENDEES OPERATINGREACTORSEVENTSBRIEFING(89-4f November 22, 1939 NAME ORGANIZATION NAME-ORGANIZATION R. Capra NRR/PD 1-1 C. Haughney NRR/DOEA l
H. Alderman ACRS R. Auluck NRR/ADSP
?
F. Ilitt NRR/EMCB S. Koscielny NRR/EMCB R. Kendall NRR/DOEA M. Reardon NRR/DOEA.
M. Case NRR/PQUB M. Ham NRR/EttCB C. Thomas NRR/DLPQ J. Ball-NRR/DRIS P. Baranowsky NRR/00EA J. Carter NRR/D0EA E. Rossi' NRR/DOEA T. Chan NRR/PD-5 A. llang NRR/PD 1-4 N. Kadambi.
NRR/0CGB S. Wu NRR/SRXB A. Gilbert NRR/DOEA J. Clifford OEDO W. Troskoski OE t
R.~ Perfetti OE i
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ENCLOSURE 2 f
's, OPERATING REACTORS EVENTS BRIEFING 89-41 EVENTS ASSESSMENT BRANCH LOCATION:
10B-11, WHITE FLINT E
WEDNESDAY,: NOVEMBER 22, 1989, 11:00 A.M.
g I
.HADDAM NECK FUEL R0D FAILURES DUE TO POST-MAINTENANCE DEBRIS i
1 1'
1 5
1 7*"89-41L HADDAM-NECK.
FUEL R0D FAILURES DUE-T0 POST-MAINTENANCE DEBRIS 1
0CTOBER 11, 1989 PROBLEM AT LEAST 343. FUEL PINS FAILED'(WITH THROUGH-WALL CRACKS).- OVER 1,200 0F THE 20,000 PINS HAVE VISUAL MECHANICAL DAMAGE, CAUSE?
J
. DAMAGE FROM' DEBRIS WillCH ESCAPED CONTROLS DURING THE PREVIOUS OUTAGE..
SAFETY. SIGNIFICANCE INADEQUATE' CLEANUP AFTER MAINTENANCE IN THE REACTOR COOLANT SYSTEM COULD RESULT IN FUEL FAILURES AND REACTOR COOLANT ACTIVITY THAT EXCEEDS: TECH SPECS.
THIS IS SIGNIFICANT BECAUSE IN THE EVENT OF AN ACCIDENT:SUCH AS SGTR, HIGH ACTIVITY MAY BE RELEASED IN THE
. PLANT AND/0R T0sTHE ATMOSPHERE.
DISCUSSION o
DURING! Tile PREVIOUS REFUELING OUTAGE IN JULY 1987, REPAIR WORK WAS DONE.0N THE CORE BARREL SUPPORT BLOCKS, THE OLD FLEXURE SUPPORTS (WHICH PREVENTED ROTATION OF THE THERMAL SHIELD)-WERE REPLACED'WITH LIMITER KEYS, L
.o DURING THE CURRENT REFUELING OUTAGE, WHICH BEGAN IN SEPTEMBER 1989, THE LICENSEE OFF-LOADED THE CORE TO INSPECT THE SUPPORT BLOCKS AND'THE NEW LIMITER KEYS, WHILE INVESTIGATING THE CAUSE OF RAISED ACTIVITY DURING THIS CYCLE, THE LICENSEE DISCOVERED I
i
~ METAL SHAVINGS.BETWEEN THE FUEL PINS.
o -Tile LICENSEE BELIEVES THESE METAL SHAVINGS ORIGINATED FROM THE L
MACHINING OF THE OLD FLEXURE SUPPORTS, o -THE LICENSEE USED REMOTE, " PICKING" TOOLS TO PICK-AWAY METAL L
SHAVINGS FROM THE INDIVIDUAL FUEL ASSEMBLIES.
THE LICENSEE y
COLLECTED ABOUT 1 GALLON OF SHAVINGS, l
CONTACT:
A. P. GILBERT SIGEVENT:
YES
REFERENCES:
MORNING REPORT 10/12/89 AND 10 CFR 50.72 # 17128 g
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lIADDAM-NECK 5
- 89,
1 l
DISCUSSION (CONTINUED) o HADDAM NECK OPERATED FOR 460 DAYS WITH ONLY SMALL INDICATIONS
-0F FUEL PIN' LEAKAGE, REACTOR COOLANT ACTIVITY WAS WELL BELOW TECH SPECS LIMITS.'
o AT LEAST: 343 FUEL PINS _ HAVE BEEN IDENTIFIED VI A ULTRASONIC TESTING-(UT)-AS FAILED FUEL - THAT IS, WITH THROUGH-WALL CRACKS; UT CAN ONLY.. IDENTIFY LEAKING FUEL PINS, EDDY CURRENT TESTING MUST BE USED TO IDENTIFY DEGRADED CLADDING AND REQUIRES THE FUEL PIN TO BE REMOVED FROM THE ASSEMBLY-A 100%~ INSPECTION WOULD TAKE ABOUT 1 YEAR,
~THE LICENSEE POSTULATES THAT 400 TO 800 FUEL RODS HAVE BEEN DEGRADED BUT ARE NOT LEAKING.
THE LICENSEE IS RECONSTITUTING
.AFFECTED ASSEMBLIES WITH DONOR PINS FROM ONCE-BURNED ASSEMBLIES
-AND IS HAVING B&W SHIP-IN FRESil ASSEMBLIES AS WELL, THE LICENSEE IS CONSIDERING METHODS OF INSFECTION OF THE REMAINING FUEL, FOLLOWUP' o
CONNECTICUT YANKEE ATOMIC POWER CO, IS CONSIDERING FILTERING THE REACTOR COOLANT SYSTEM BEFORE THE STARTUP SCHEDULED FOR JUNE 1990, o
THE MATERIALS a CHEMICAL ENGINEERING-BRANCH AND THE REACTOR SYSTEMS BRANCH ARE FOLLOWING THE LICENSEE'S-ACTIVITIES, WHICH INCLUDE DEVELOPING AN INSPECTION PROGRAM 0F THE REMAINING FUEL ASSEMBLIES AT HADDAM NECK AND EVALUATING WHETHER THE CURRENT FSAR ACCIDENT ANALYSES ARE BOUNDING, v
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THERMAL SHIELD WITH FLEXURE SUPPORTS 6
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. BOTTOM SUPPORT i= 9 l
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e ENCLOSURE 3 REACTOR SCRAN Su MARY i
NEEK ENDIN6 11/19/89=
- 1. PLANT SPECIFIC DATA:
[
L MTE :
SITE UNIT PONER SI6NAL CAUSE-
'COMPLI-'
YTD. YTD-Vil CATIONS-ABOVE ELOW TOTAL 151 152 i
11/14/89 ARKANSAS:
1 74 A PERSOMEL NO 4
0-4' 11/15/89 MONTICELLD.
l' 100 A EQUIPMENT
- ND '
1 0
1 11/18/89 FARLEY '
. 2 100 A-EQUIPMENT NO 5
1-6-
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-1.
JII. COMPARISON OF WEEKLY STATISTICS WITH INDUSTRY AVERAGES
. l
. SCRAMS FOR WEEK ENDING 11/19/B9
' SCRAM CAUSE-POWER NUMBER 1989 1988 1987 1986 1985.
OFi WEEKLY WEEKLY WEEKLY WEEKLY WEEKLY SCRAMS (5)
AVERAGE AVERAGE AVERAGE AVERAGE AVERAGE YTD (3)(4)
(8)(9)
/$* POWER >15%
-EQUIP. RELATED
.>15%
2 3.0 3.1 3.9 4.3 5.4' PERS.=RELATED(6) >15%-
1 1.1 1.0 1.3 1.8 2.0 LOTHER(7)
>15%
0 0.1 0.5 1.2 0.4 0.6
'4*< Subtotal **
3 4.2 4.6 6.4 6.5 8.0
$$ POWER.<15%-
EQUIP. RELATED
<15%
0 0.4 0.5 1.2 1.4 1.3 PERS. RELATED.
<15%'
O O.3 0.3 0.6 0.8 0.9-OTHER.
<15%
0 0.0 0.1 0.3 0.2 0.2
- 1Bubtotal **
O O.7 0.9 2.1 2.4 2.4
-***? Total ***
3 4.9 5.5 8.5
- 8. 9 -
10.4
,{
MANUAL VS AUTO SCRAMS
. TYPE.
NUMBER 1989 1988 1987 1986 1985 OF WEEKLY WEEKLY WEEKLY WEEKLY WEEKLY SCRAMS AVERAGE AVERAGE AVERAGE AVERAGE AVERAGE YTD
-MANUAL SCRAMS O
O.9 1.0 1.4 1.0 1.0 1 AUTOMATIC SCRAMS 3
3.9 4.5 7.0 7.9 9.4 F
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__.m_,____.___.________._______m___._______
T*o 9
._ NOTES
.4
- 1. -
PLANT SPECIFIC DATA BASED ON INITIAL REVIEW 0F 50.72 REPORTS FOR THE WEEK OF INTEREST.
PERIOD IS MIDNIGHT SUNDAY THROUGH MIDNIGHT SUNDAY. SCRAMS ARE DEFINED AS REACTOR PROTECTIVE
-ACTUATIONS WHICH RESULT IN R0D MOTION, AND EXCLUDE PLANNED TESTS OR SCRAMS AS PART OF PLANNED SHUTDOWN IN ACCORDANCE WITH A PLANT PROCEDURE. THERE ARE 111 REACTORS. HOLDING AN OPERATING LICENSE.
2.
COMPLICATIONS:' REC 0VERY COMPLICATED BY EQUIPl!ENT FAILURES OR PERSONNEL ERRORS UNRELATED TO CAUSE OF SCRAM.
3.
PERSONNEL RELATED-PROBLEMS INCLUDE HUMAN ERROR, PROCEDURAL.
DEFICIENCIES,'AND MANUAL STEAM GENERATOR LEVEL C0HTROL 4
PROBLEMS.
]
4.
"0THER" INCLUDES AUTOMATIC SCRAMS ATTRIBUTED TO ENVIRONMENTAL CAUSES (LIGHTNING), SYSTEM DESIGN, OR UNKNOWN CAUSE.
1
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