ML17173A714

Forwards LER 79-013/03L-0

ML17173A714
Person / Time
Site:	Dresden
Issue date:	03/23/1979
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A715	List: ML17173A714 ML19263D325
References
79-251, NUDOCS 7903270448
Download: ML17173A714 (2)

Text

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Commonv.Ath *Edison Dresden NLi;l~~wer Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 March 23, 1979 BBS LTR ti 79-251 James G. Keppler, Regional Director Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report II 79-13/03L-0, Docket. //050-237 is hereby submitted to your office in accordance with Dresden Nuclear Power Station Technical Specification 6.6.B.2.(b), conditions leading to operation in a degraded mode permitted by a limiting condition for operation or plant shutdown required by a limiting condition for operation. (~

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Station Superintendent Dresden Nuclear Power Station BBS:lcg Enclosure cc: Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC 7 9 0 3 2 7 0 4L/f

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• I 1Q !PLEASE PRINT OR n . L L REQUIRED INFORMATION! .

6 [212] Ir IL In IR Is I 2  !(~)lo Io 1- Io lo Io Io Io 1- lo lo 10)1 411 I l I i I i 101 I 10 1 8 9 \..ICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 C' ... ) --:CON.'.:f.----;-  ; [I[i].  :~~~~~ L:J©I 0 I 5 Io Io Io 12 13 17 !GI o 12 12 13 17 19 @I o I 3 I 2 I 3 I 1 I 9 IG) 7 8 60 61 DOCKET Ni.JMSER 68 69 EVENT DATE 74 75 REPORT DATE SO EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES {1o)

• I While UJ was shutdown and U2 at steady' power, 2/3 D/G was manually started prior to

[[II] I takin8*32 transformer out of service .. 15 min. later CLG. water pump breaker thermally

. [[ill I tripped                           and auto .. transferred to *redundant power supply.                                                                  Tr:lp reset manually and re-

[QI[] I turned to original power supply. After 20min. tripped again.* The redundant power []JD I supply was also.. found tripped. Trips reset and ran successfully. Since redundant 02]. ID/G's were available, *safety significance of this incident is minimal. Last trip occurred on 6/30/78 (LERU18-41/Q3L-O) [[ill 7 8 9 60 SYSTEM. CAUSE CAUSE COMP. VALVE CODE CODE SUBCOOE . COMPONENT CODE SUBCODE SU BC ODE [Iill' I El El@ w@ UJ@ Ip I ul MI p Ix Ix I@ L!J@ UJ@ 1 a 9 10 11 12 13 . 16 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION

                     ~       LE A/RO CVENT YEAR                                                       REPORT NO.                                    CODE                TYPE                         NO.
                    \!.:J   REPORT N.UMBER I I I 7 9 I        I              I 01 i1. JI.                  I/I             Io I J I              ~             l=.l           ~

21 22 2J 24 26 . 27 28 29 JO 31 J2 ACTION FUTURE EFFECT SHUTDOWN. * (.;'.:;\ ATTACHMENT NPRD-4 PRIME COMP.

• COMPONENT

                  *TAKEN         ACTION.                  ON PLANT              .METHOD                                HOURS ~             SUBMITTED        FORM ::;us.      SUPPLIER*           MANUFACTURER W@W@

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47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @ . QliJ I Cause unknown. Load check and motor bridge and meggar were performed.* No fault .found.I OJJJ I Pump temperature, discharge pressure, and vibration were normal while running. Pump []]]] I has been run 3 times since with no failure. Additional checks will be performed during!

. fIII] I the upcoming biannual insp.                                                                                                                                                                              I r.tm8 1                9                                                                                                                                                                                           80 FACILITY                                                        .                         13Q\           METHOD OF STATUS                   % POWER                                 OTHER STATUS            \.:::;:J       DISCOVERY                               DISCOVERY DESCRIPTION        @

ITTIJ 1 8 lli.J@ I g Bl ol@._I_U_J_s_h_ut_d_own_*_ 9 10 12 11 44

                                                                                                                           *Ul@I             Operational Event 45           46                                                                    80 ACTIVITY            CONTENT                                     .                        ~

RELEASED OF.RELEASE AMOUNT OF ACTIVITY~ LOCATION OF RELEASE @

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9 . 10 11 44 r 45 NA 80 PERSONNEL EXPOSURES r.;;:;"\ NUMBER A TYPE DESCRIPTION . III2J 1 8 lo 9 I al ol0LLl@11 12

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• 1~3~~~~~~~~~~~---~~~~,....-~~~~~~~~~~~~~~~~~~~80 PERSONNEL INJURIES Q

                      . NUMBER                       DESCRIPTION~
   ~lo lo lo l@)~~N~A;_.._.~*~~~~~~~~~~~~~~~~~~~~~~~~--1 1          8   9                    11           12                                                                                                                                                         80 LOSS OF OR DAMAGE TO FACILITY                       t4j\

TYPE DESCRIPTION '.::.::) ITliJa 1 Lz_j@ . NA 9 1~o~---~~~~~---~~~~~~~-~-~~~-~~~~--~~-~~~~~~~~-8~0 PUBLICITY Q ISSUEOf,;'";;\ DESCRIPTION~ 7 9032 NRC USE ONL y o lITIJa llLJ61 NA , 7 O 4 5 .3 .I I I I I I I I I I I I I I: 1 91 ~o~~-~~--~~~~~~~~~~~~--~~~~~-~~--'68 69 80*;

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