ML20028G380
| ML20028G380 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 01/27/1983 |
| From: | File P, Lagiewski J BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20028G379 | List: |
| References | |
| LER-82-010-03X, LER-82-10-3X, NUDOCS 8302090203 | |
| Download: ML20028G380 (3) | |
Text
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION
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- LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 l0 l1l8 l9 Ml DlLICENSEE 7
C l CCODE l Nl 214l@l150 l 0 l - l 0 lLICENSE 0 l 0NUMBER l 0 l 0 l - l 0 l 025l@l264 l 1LICENSE l 1 l TYPE 1 l 1JOl@l$7 CAT l 58 l@
CON'T 10111 7 8 3$"cllL @l0l5l0l0l0l3l118l@l0l2l1l2l8l2l@l0l1l2l7l813l@
60 61 DOCKET NUMBER 68 69 EVENT DATE 74 7S REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEOUENCES h Io12l l At 1000, following a reactor trip, it was discovered that CEA-19 had l y g ;3 y ; stuck at the approximately 8" withdrawn position. Attempts to move the l
[o i4 ; l CEA failed and it was declared inoperable (T.S. 3.1.3.1 & 3.1.3.4). l
) goi3; l CEA-19 was freed and tested satisfactorily at 1557 on 2/13/82. All l
[o is l l other CEAs remained operable and adequate shutdown margin was maintained l jol7ll throughout this event. No similar events have been reported. l I
10181 L E CODE SUBCO E COMPONENT CODE SUBC DE SU E lol91 8
l R l B lh Wh yh l Cl 0l Nl Rl 0l Dlh W@ W h 9 10 11 12 13 18 19 20 7
SEQUENTIAL OCCURRENCE REPORT REVISION EVENT YEAR REPORT NO. CODE TYPE NO.
LE RcRO h &E l 8l 2l b l0l1l0l y l0l3l 28 29 lXl 30 l-l 31 W32
_ 21 22 23 24 26 27 KN AC O ON PL NT ME HOURS SB . FO b B. SUPPLIE MANUFACTURER l33Xlgl34Xlg ]35g y@ 36 l0l0l0l0l 31 40
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47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h lilol l During U-2 refueling, the CEA and its associated bundle were inspected. I glil l Visual exams were performed on the fuel assembly, CEA, and CEA extension l
,, ,7, l shaft. Eddy Current Exams were performed on the fuel bundle guide tubes l i,;3, l and CEA The center CEA finger was profiled as well. There was not any l ii ;4 l l evidence of a causative agent for the event, or of any sustained damage. l 7 8 3 80 ST S % POWER OTHER STATUS IS O RY DISCOVERY DESCRIPTION NA Operator Observation l 1115 l l G l@ l 0l 0l 0l@l l l Al@l ACTIVITY CO TENT AMOUNT OF ACTIVtTY LOCATION OF RELEASE 7
1 6 8 9 W
RELEASE to
@D OF RELENAASE]gl 11 44 l l 45 NA 80 l
PE RSONNE L EXPOSURES NUMBE R TYPE DESCRIPTION NA l l 1 l / } l 0 l 0 l 0 l@l Z l@[ 60 PERSONNE L INJU IES NUMPER DESCRIP TION 1 8 l0l0l0l@l' NA 8302090203 830127 80 l
toss TYPE OF OR DSAGE iO FACluTY DE SCHIPTION PDR ADOCKh05000318 S,, PDR l 1 l 98 ]9 l Z l@l10 80 7
PU BL ICIT Y NRC USE ONLY 12101
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issutO Whl' oucam iioN NA l 68 69 llllllll{lllJ 80i h NAME OF PREPARER
.J. S. Lagiewski/P. A. File PHONE: 301-269-4747/4470 {
i
- .o LER NO. 82-10/3X, Rev. 1 DOCKET NO. 50-318
. LICENSE NO. DPR-69
, EVENT DATE 02/12/82 i REPORT DATE 01/27/83 ATTACHMENT EVENT DESCRIPTION AND PROBABLE CONSEQUENCES At approximately 1000, 2/12/82 a reactor trip occurred. Subsequent to the trip, it was observed that CEA 19 was not fully-inserted. CEA position via the reed switch system indicated that the CEA was at the i approximately 8" withdrawn position. Attempts to move CEA 19-in or'out using the normal coil power programmer were unsuccessful while in Hot
- Standby. CEA 19 was declared inoperable (T.S. 3.1.3.1 and 3.1.3.4).
j Coil current traces for CEDM 19 verified that the CEDM was operating I
normally and suggested that the drive train (either the CEA or its extension shaf t) was stuck. While in Hot Standby an unsuccessful attempt
. was made to move CEA 19 in or out using a " manual sequencer" (provided by Combustion Engineering) in place of the normal. coil power programmer. ,
An unsuccessful attempt was made to free the CEA by stopping and starting the RCP with its discharge closest to the CEA position.
Cooldown was initiated and several attempts to move CEA 19 during the cooldown, using the normal coil power. programmer, were still unsuccessful.
- With the RCS at 220-2250F, 270-280 psia, and two RCP's operating, another attempt was made to move CEA 19 using the " manual sequencer". This attempt was cuccessful; the CEA was first withdrawn 3/4" from the stuck
- position and then moved to the 12" withdrawn position.
CEDM 19 was then switched to a dual coil power programmer module (with minimum pull down coil voltage) and withdrawn from and inserted to the
< 8" withdrawn position. The CEDM was unable to drive CEA 19 down through i the 8" withdrawn position. An attempt to scram the CEA from the 8" with-j drawn position was not successful. CEA 19 was withdrawn to 31" withdrawn i position and successfully scrammed to full insertion as verified by 4 i the reed switch system. Additional scrams from various heights (up to
- the Upper Electrical Limit) were also successful in that the'CEA inserted fully and was withdrawn successfully using the dual coil power programmer module with normal voltage to all coils. A normal drop time measurement was made at 1552, 2/13/82 with satisfactory results. CEDM/CEA 19 was j
exercised under the above cold conditions using the normal single ccil power programmer module with normal voltage to all coils. A scram from i the Lower Electrical Limit resulted in full insertion of the CEA.
Operation in withdrawn, insertion, and scram modes in the region of l previous hangup was normal. CEA 19 was declared operable at 1557 on
! 2/13/82. Throughout the period the CEA was inoperable, adequate i shutdown margin was maintained. No similar events have been reported.
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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (CONT'D)
Fuel assembly 2F123 was visually inspected with a TV camera, and the inspection was documented on videotape. The five guide tubes were tested with an ECT bobbin coil probe over their full lengths. The probe met with no obstructions over the entire length of the guide tubes, and the results of the visual exam and the ECT showad no anomalous indications.
CEA BD was inspected with a TV camera (this inspection was also recorded on videotape). The inspection yielded no remarkable indications. The lower twenty inches of the fingers showed typical burnish marks resulting from intere: tion with the guide posts of the fuel assembly. Patches of crud seen on the center finger were not deemed substantial enough to have contributed to the CEA becoming lodged.
Each of the five fingers were ECT over their entire length, showing no indications which could be attributed to the efforts to dislodge the CEA.
There were indications of some light wear on one finger, and four fingers showed some ridging at the lower end. The finger which gave the largest ridging indication was profiled for diameter measurements.
Results showed no indications which would explain the CEA becoming lodged, and no evidence of sustained damage to the CEA during attempts to dislodge it. The conclusions were that both the CEA and the fuel assembly were fit for continued opera-ion.
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