ML20004D131
| ML20004D131 | |
| Person / Time | |
|---|---|
| Site: |  |
| Issue date: | 05/29/1981 |
| From: | Pastva M CAROLINA POWER & LIGHT CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML20004D128 | List: |
| References | |
| LER-80-038-03L, LER-80-38-3L, NUDOCS 8106080442 | |
| Download: ML20004D131 (2) | |
Text
U. h. NULLt AM M*nsut A e un y Lummissavig NRC FORM 366 UP dita PdPort LICENSEE EVENT REPORT Pr vious R port D:tn 5-28-80 CONTROL BLOCK: l 1
l l l l l lh 6
(PI 7ASE PRINT C R TYPE ALL REOUIRED INFCCMATIEN) 4 l 401 l t51l gar1 $4l l@
l i 8 lU N lLICENSEE C l BCODE l E lP l 1 l@l 0 l 0lUCENSE to it
-l O NUMSEH l 0 l 0 l 0 l O 25l -l O 26 l 0 l@lTYPE uCENSE 1 l@l CON'T Lo_Li l F S
"> , "J l t. l@l 01 5101 60 61 00CKET NUMBER
-l 01 3l 21 s lCut 68 69 EVENT o DATEf s i o f il 31 o l@l o l 51 'I a l a l '
14 15 REPORT DATE 80 EVENT DESCRIPTION AND f ROBABLE CONSEQUENCES h I
l o l a 1 l During normal plant operation, IA Reactor Recirculation Pitmo trioned dee to motor-jgenerator (MG) set low oil pressure. Immediately following the trip a normal MG l o a lo l4 l l set oil pressure of 40 psig was observed. The MG set low oil pressure trio setnoint i ITTT1 li s 3012 psig. A similar event occurred on May 12, 1980. Neither event affected the l 10 p, I l health or safety of the public. I I
10171 l Technical Specifications 3.4.1.1, 6.9.1.9b l l o la l L_ 50 C DE CODE SU C E COMPON ENT CCDE SU 8 CO D'E SU E 10l9l 7 8 lC lB10l@
9 11
@ l Xl@ lG lE lN lE lR l A l@ lX l@ l20Zl@
12 13 18 19 OCCURRENCE REPORT REVIS.ON SEOVENTIAL EVENT YEAR R EPORT NO. CODE TYPE N O.
LER RO
@ ,agg 18l0l l-l l01318] l-l 10 l 3 l l 1. l l-l l 1l
,_ 21 22 23 24 26 27 23 29 30 31 32 K N A O O P NT tE HOURS S8 IT FOR 8. $UPPt IE MAN FACT RER lX 33 lglJ4Z l@ l33B l@ lZl@
36 l0l0l0l1l 31 40 lY l@
41 l42Y l@ W@ lFl 1l2 l 7l@
43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h I i l o ] l An investigation of these events , which included an inspection and calibration check ofl i i lthe MG set oil pressure control valve, PCV-1739. and low oil oressure tH, m f th !
m l1-B32-S001A-PS-1, 2, and 3, failed to reveal any oroblems which might have caused I ii;3i ]either of the trips experienced. In each case the MG set was restarted and the assn- !
g lciated pump was returned to service. J 80 7 8 g ST S % POWER OTH ER STATUS SCO RY otSCOVERY DESCRIPTION NA Operational Event I i l 5 l W@ l0 l8l7l@l l lAl@l l ACTIVITY CO TENT RELEASED OF RELEA AMOUNT OF ACTIVITY LOCATION OF RELEASE l1 16 1 W @ W g'dl NA l l NA _
80 l
7 8 9 10 11 44 45 PERSONNEL EXPOSURES NUV8ER TYPE DESCRIPTION NA l l i I 7 l l 0 l 0 l0 l@l Z l@l 80
' ' ' ' ' i3 PERSON ~s't iNJUd ES NUMBER DESCR'PTION i lilHj l 0 l 0 l0 l@l NA SQ l
7 8 9 11 12 LOSS OF OR DAMAGE TO FACILITY TYPE DE SCRIP TION NA l 1
li 191 7 8 9 lZ lhl to 80
- 55 DESCRIPTION l,_! L.J I N81 - a NA I 11Il111ll11Iil 68 so Bo 2 8 2 io w 1 o ti 08 08(8f ell NAME OF PREPARER
- O'
- PHONE: 919-457-99
r.
LER ATTACHMENT - RO (11-80-38 Facility: BSEP Unit No.1 Event Date: May 1, 1980 Immediately following . the initial .ip a visual check - of the MG set was performed. At that time it was observed that the MG set oil pressure control valve was operating normally and controlling pressure at a desired value of 60 psig. Based on these observations a decision was made to raise the oil pressure control setpoint to 45 psig to prevent a spurious low pressure spike from tripping the MG set. In addition, the frequency of verifying proper oil
- pressure was temporarily increased from the normal once-per-shift until the oil press.tre was determined to be stable. On May 12,1980, it was observed that the MG set oil pressure had decreased to apprcximately 41 psig. A decision was then
,made to readjust the oil pressure control valve setting in order to maintain 45 psig. ~ While performing this evolutica the oil pressure became very erratic and a low pressure dip occurred causing the MG set to trip. The MG set oil pressure was then readjusted to 45 psig and the MG set and its associated pumps were restarted.
Follouing the second trip work authorizations were initiated to inspect and
"~
perform _ calibrations on all components of the MG set which could have produced
~
the low oil pressure dips. This investigation was conducted during the 1980 unit refueling outage. Calibrat' ion and visual checks of the oil pressure trip switches and other system oil pressure control components did not reveal any problems which could have resulted in either of the experienced trips. As no cause for either event was cetermined, despite investigative attempts , and because no further MG set trips have since occurred, it is felt that, further ,
corrective actions pertaining to these events,is unnecessary and is therefore not planned. ,
f O .
O b
i