05000237/LER-1979-039, Forwards LER 79-039/03L-0
| ML17173A927 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 06/15/1979 |
| From: | Stephenson B COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML17173A928 | List: |
| References | |
| 79-485, NUDOCS 7906220365 | |
| Download: ML17173A927 (5) | |
| Event date: | |
|---|---|
| Report date: | |
| 2371979039R00 - NRC Website | |
text
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- Commonwealt9dison Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS Ltr //79~485 James G. Keppler, Regional Director Directorate of.Regulatory Operations - Region III
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Glen Ellyn~ IL 60137
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Reportable Occurrence Report /179-039/03L-0, Docket 11050-237 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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.Enclosure 0
A"-: B. B.- Stephenson [y
Station Superintendent Dresden Nuclear Power Station cc:
Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC
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ACaJSEE EVEi'J.\\f REPORT I~
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CONTROL BLOCK:
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- 1 1 1 L I.D I R I s 12 101 ° I 0 1-I 0 I 0 I 0 I 0 I - I 0 I 0 I 7
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LICENSEE CODE 14 15 LICENSE NUMBER 101 4 11 11 11 1~01 I f © 25 26 LICENSE TYPE
- JO.
57 CAT 58
- ..:.CON.';:T __ _
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60 61 DOCl~ET NUMBER 68 69 EVENT DATE 74
"/5 REPORT DATE 80 EVENT DESCRIPTION ArJD PROBABLE CONSEQUENCES@
I During normal operation, the 125V DC switch No. 2, "Reserve Feed, Bus 22,"
.!ITIJ 1was opened during ground checks on Unit 2 turbine building main bus.
As CQID _la result, 2B2 recirc. MG set oil pump tripped, followed by a trip of the 2B [QJTI jrecirc. MG set.
The A MG set speed was reduced <65% as required by the Technical
~
1specifications.(Sec. 3.6.H.4).
No Technical Specifications for the.reactor
.[I]}] _(parameters were exceeded, and, therefore the safety significance of this event was minimal.
C2JI::I~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 8 !i 80 [ill]
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SYSTEM CODE IC IB I@
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LE R/RO CVEC'JT YEAR 0
REPORT I 7 I 9 I NUMBER 21 22
- ACTION FUTURE EFFECT
- TAKEN ACTION ON PLANT
CAUSE
CAUSE COMP.
VALVE CODE SUBCODE COMPONENT CODE SUBCODE SUB CODE l!J@ w@ le IKIT IB IR IK I@ W..LzJ@
11 12 13 l.=J 23 SHUTDOWN METHOD SEQUENTIAL REPORT NO.
I o I 3 I 9 I 24 26 HOURS
,q OCCURRENCE COL>[
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REPORT TYPE w
30 PRIME C.OMP.
SUBMITTED FORM SUB.
SUPPLIER REVISION NO.
l_QJ 32 COMPONENT MANUFACTURER
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LB@~@ l!:J@. ~ I o I o I o 33 34 35 36 37 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @
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44 47 [JJ=2J. I Opening switch 11.2 resulted in a loss of control power to the 2B recirc. MG J
- DJTI J,set.causing _i,t ~to _,tr-ip.
.S~i.tch 112 was reclosed immediately~ and 2B recirc.* MG set [T[i] J restarted.
Switch 112 was marked to caution against opening.
No similar event encountered in the *past.
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9 FACILITY ST.8TUS
% POWER OTHER STATUS f2TIJ L:J@ I 0 I 91 6 l@).__I __
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- . ACTIVITY
- CONTENT
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RELEASED OF RELEASE AMOUNT OF ACTIVITY.
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METHOD OF DISCOVERY
~@I Operator 45 46 45 80 DISCOVERY DE_SCR_IPTION observation 80
. LOCATION OF REL.EASE @
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Commonwealtilltison Dresden Nuclear Power Station "
R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS LTR 1179-4 72 June 12, 1979 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 /179-034/0lT-0, Docket 11050-237 is hereby submitted to your office in accordance with Dresden Nuclear Power Station Technical Specification 6.6.B.l.(b), operation of. the unit or affected systems when any parameter *or ope_ra.tion subject to a limiting condition is less conservative than the least conservative aspect of the limiting condition for operation established in the technical specifications.
BBS:lcg Enclosure
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J.A-.. ~B. B. Stephenson
- tr'-, Sta.tion Superintendent
- Dresden Nuclear Power Station cc:
Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC 110&?J..0037D
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LICENSEE EVENT iiEPORT
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(t\\.EASc PRINT OR TYPE*ALL &IRED INFORMATION)
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tEl W_r,J_D IR Is I 2 101 0 I 0 I _:I 0 I 0 I 0 I 0 I 0 I -.I 0 I 010l!t_Ll_l 1 11 I i 101 I 10 8
9 UC.'-l*iSEE CODE 14 15 LICENSE NUMllER 25 26 LICENSE TYPE JO 57 CAT 58
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~~~~~I~~ ~G)IO IS 10 10 10 12 13 17 IG)LOI SI 31 01 7191@1Ol6I1 I 217 !9 l@ __
GO 61 DOCKET NUMBER 63 69 EVENT DATE 74 75 REPOriT DATE
.. 80 -
8 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (,OJ I On 5/24/79 with Units 2 and 3 in ste~y state operation, U 2/3 DG failed to start
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I during operability test subsequent to finding a LPCI injection valve inoperable.
On ili:ITI I S/30/79, similar event occurred when D 2/3 DG failed to start during operability test
@J}J I after* D2 DG was declared inop.
U3 DG was immediately proven operable.
Shutdown of
'.QJTI I U2 was initiated immediately.
Safety significance minimized since off site power was [ill
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available at all times.
8 9 SYSTEM
CAUSE
CODE CODE [IT]'*
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@ CER/ROCVENHEAe REPORT l 7 I 9 J l::::.I NUMi3ER 21 22 23
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' 18 SEQUENTIAL OCCURRENCE REPORT r,o,
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31 32 80 ACTION FUTURE EFFECT SHUTDOWN
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ATTACHMENT rrEtl@l~
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NPRD-4 FORM :;ur..
PRIME COMP.
.SUPPLIER COMPONENT MANUFACTUllER 33 34 35 36 3 7 40 41
~ [~@ l I Io 11 1s J CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @
42 43 44 47
~oth events were failure to engage of lower*air* startbendix gear.
After
~l_f_a_i_l_u_r_e_o_n_5_-_2_4_,_2_/_3_D_G_s_u_c_c_e_s_s_f_u_l_l_y_s_t_a_r_t_e_d_3_*_t_i_m_e_s_. __
A_f_t_e_r_2_n_d_.f_a_i_l_u_r_e _______ __.l.
- IIIJ l lower start motor replaced.
Failure. to.engage occurred several times in
'.IIIJ l past.
Mod. in progress to install multiple air start attempt circuitry.
J:ID I In interim, gear alignment will be checked after every test of 2/3 DG.
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. FACILITY f:3Q\\
J 80 STATUS
- 16 POWER OTHEll STATUS ~
m ~@ I 0 I 9 19 J@)I U3 at 99%
. J METHOD OF DISCOVERY
~@I DISCOVERY D!;.SCRIPTION (:j2'\\
Operability te,st at ter U2 t5ft; Failure !
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10 12 1'l
. ACTIVITY CONTENT
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10 11 44 45 80 46 44 45 N/A
. LOCAT.ION OF RELEASE @
I f\\O PERSONNEL EXPOSURES r:;;::.,
NUMBER
(.;'::;\\ TYP[
OESCRlr*TION IDJ I ol oj oJ6W@L__.
N/A e
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'----~-------~-----~-~-~-----~-------J 80 PERSONNEL INJURIES
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NUMBER DESClllPTIOt~ 41
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11 12 BO LOSS OF OR DAMAGE TO FACILITY '4°31 TYP[
DESCRIPTION
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ISSIJEL'%-:;\\ DESCRIPTION~
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ATTACHMENT TO LJCENSEE EVENT REPORT 79-03.4/0lT-0 COMHONWEALTH EDISON COMPANY (CWE)
DRESDEN UNIT ILDRS2 DOCKET # 050-237 On 5/24/79 with both Units 2*and 3 in stu:idy state operation, the U 2/3 D/G failed to start during a test to prove operability subsequent
- to f.inding a LPCI injection valve inoperable.
It was observed that the lower bendix gear butted tooth to tooth with the ring gear ie failed to engage.
A second start innnediately following the failure was sue-
. cessful.
Tests performed by maintenance personnel could not repeat the gear abutment.
However, on 5/30/79, a simiiar event occurred.when U2/3 D/G failed to start during an operability test following a fail-ure* of the U2 D/G to properly shutdown (R.O. #79-37/03L-0).
U3 was
- . inunediately proven operable and an orderly shutdown of Unit 2 connnenced..
The safety significance of this event was minimized since off site power
- was available at all times.
Both events were caused by the-failure to engage of. the lower air
- start bendix gear.
Following the first failure on 5/24/79, 2/3 D/G was
- successfully started three times.
The failure could not be duplicated.
After the second failure, the lower air start motor was replaced.
It was taken apart and inspected, but no abnormality could be found.
Failures of these motors to engage has occurred in the past.
As a result of these earlier failures the station contacted the vendor to seek a corrective action to prevent recurrence of the ai~ start
. motors failing. to engage_'.
0 As a result of that investigation, a modification is pending to
- the air start circuitry to add a multiple start feature.
The-modified system will function by making several attempts at air start motor engagement, before the starting sequence is lock.ed out.
The present system only allows one attempt before the start cir-cuitry locks out on "FailureTo Start". Installation of the modifi"'-*
cation will be completed as soon as all parts are available.* The frequency of operability testing for the 2/3 DG has beeh increased to weekly.. for one month to assure proper operation.
In addition, after each start of the diesel for surveillance testing and until the air start modificat.ion is complete, proper alignment of the air start pinions is being verified in accordance with an approved station procedure~