ML17252B518

LER 78-031/03L-0 for Dresden, Unit 2 Re PS-2-1430-1466C Failed to Operate

ML17252B518
Person / Time
Site:	Dresden
Issue date:	06/02/1978
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
BBS LTR 78-882 LER 78-031/03L-0
Download: ML17252B518 (2)

Text

e Commonwe6' Edison Dresden Nuclea~er Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920

-:Jurie 2., 197.8 *_-*

BBS Ltr 1178-882 James G, Keppler, Regional Director Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 6013.7 Reportable Occurrence Report /178-031/03L-0, Docket /1050-237 is hereby submitted to your office in accordance with Dresden Nuclear Power Station Technical Specification 6.6.B.2~(a), reactor protection system or engineered safety feature instrument settings which are found to be less conservative than those established by the technical specifications but which do not prevent the f~lfillment of thet:ftinctional requirements of affected systems.

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~A"-.B. B. Stephenson f v Station Superintendent Dresden Nuclear Power Station BBS/deb Enclosure cc: Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC JUN oG '1918

NRc i=oRnil 366

• u. s; NucLEAR. REGULAToRv coMM1ss10N

' ~, ~LICENSEE ~~~N~ REPORT 17 77 CONTROL BLOCK

I I I. *. I 10 . (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI

. . . . 1 . 6 . . . . . .

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7.. . 8 .9 r I 1 i, 1 n 1 R 1 s 1 2101 LICENSEE CODE

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. . LICENSE NUMBER o 1- 1o1

.a 25 1014 11 11 1111 101

• 26 LICENSE TYPE JO 57 CAT 58 1 1 © .

CON'T IiliJ  :~~~~~

• LJJ©I o I s I o I o I o* 12

• 1 3 I 1 101-0 I s I o I 9 I ; I s 101 o 16 I* o I* 2* 1 .7 I s IG) * *.*

.7 8 .. 60 61 DOCKET NUMBER 68 . 69 , EVENT DATE 74 75 REPORT DATE

• 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@ . . * . * . . . .

I While performing monthly surv. DIS 1400-3; PS-2-1430-1466C failed to operate. T. S.

(]JI] I 4.5.A and Table 3.2-.2. require a trip to occur between 50 psig and 100 psig~ (Dre~denf

[Q:II) setpoint is 95 +/- *5 psig increasing). Safety implications to this event minimal becaus~ <.

~ three redundant core spray pump discharge pressure switches were operable within

• .()))) Technical Specifications. This is not a repetitive occurrence. Pressure switch is *J

[2]2].* I mfd. by Static--0-Ring, model llSN,-AA3.

IillJ 7 8 9  !)O SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCQDE

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20 SEQUENTIAL. OCCURRENCE REPORT *REVISION

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REPORT NO.

10 13 24 11 I26. . 27 1....--1 I2B CODE 01 31 29 TYPE

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~J 3.2 NO.

ACTION FUTURE EFFECT SHUTDOWN ~ ATTACHMENT NPRD-4 PRIME COMP. COMPONENT.

TAKEN ACTION* ON PLANT .METHOD

• HOURS ~ SUBMITTED FORM :;uB. SUPPLIER MANUFACTUREA-

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.**CAUSE DESC,RIPTION AND CORRECTIVE ACTIONS @

. o::::IIJ I Cause "attributable* to excess scale btiild~p within switch internals whieh prevented * *1

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__. ,....c_lo--*_s_i_n..::g:....._.-_T_h_e-s_w_i___t_c_h~__w_a_s,....,....c_l.,.e_a__n:...e.:...d_a,.;.n_d_r_e...;-:-_t--e--s--t.:..e.:..d-,-.:..s.:..ev..;..;;.e_r.;;.a..:.;1-'-*..:.;t..:.;i-m""'e;...;s'--w-'i_t_h---,,,_.,.........I O:Jil I no further. adjustments nec.essary *.* All similar model Static-0-Ring press~r*e switch.* *

• t D:IIJ I internals were .examined and found in satisfactory condition. *The Core Spray Pump Autof.

.IIITI I Blowdown :Permissive Pressure Sw~tches will continue to be tested" monthly per DIS 1400~: 3 7 8' 9 80

• . *FACILITY .IJQ\

• METHOD OF.. -* . (.;:;\

STATUS  % POWER . OTHER STATUS ~ *DISCOVERY ' . DISCOVERY DESCR:IP"T:ION ~-

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Surveillance -Testing.

• ACTIVITY CONTENT * . ~ *' .

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RELEASED OF RELEASE AMOUl\IT OF ACTIVITY~ LOCATl~N OF_.RELEASE ~

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• BO PERSONNEi: EXPOSURES

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PERSONNEL INJURIES {';;;\*

NUMBE.R DESCRIPTION6

-~  ! 01 01 ~]<§>~12------.--------,-------'N~A~.......,..------------------------_;__,..........____...;._________

LOSS OF OR DAMAGE TO FACILIT. Y 143\

BO TYPE DESCRIPTION v:::J

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ISSUED6 DESCRIPTION~ N'RC USE ONLY. ., .

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NAME OF PREPARER---------;:;......,....--.------

Carl Lindberg*

PHONE:-*_-.z_s__*

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