ML17173A901

Forwards LER 79-029/03L-0

ML17173A901
Person / Time
Site:	Dresden
Issue date:	06/05/1979
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A902	List: ML17173A901 ML19259C068
References
79-448, NUDOCS 7906120310
Download: ML17173A901 (2)

Text

Common91th Edison Dresden Nuclear Power Station R.R. #1 a' Morris, Illinois 60450 _,

Telephone 815/942-2920 June 5, 1979 BBS LTR /179..:.443 James G. Keppler, Regional Director Directorate of Regulatory Operations - Region III U. S. Nuclear Regulatory Connnission 799 Roosevel.t Road Glen Ellyn, IL 60137 Reportable Occurrence Report #79-29/03~-0, Docket #050-237 is hereby submitted to your office in*.accordance with Dresden*Nuclear Power Station Techp.ical Specification 6.6.B.2. (a), r.eactor. protection system or engineered safety feature instrument settings which are found to b.e less conservative than those established by the=.*,tech-nical specifications but which do not prevent the.fulfillment of the functional requirement's of -af~ected systems.

eph nson Station Superintendent Dresden Nuclear Power Station BBS:lcg Enclosure cc: Director of Inspectio'n & Enforcement Director of Management Information & Program Control Fi.le/NRC

':,'J 0 7 1979

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I II LI DI RI BLOCK:

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I -1 LICENSEE EVENT REPORT

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• IPLEASE ~RINT oR TY.LLRECUIRED INFORMATION;_ .

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I 0 101 *1 1 1 1 11 1 1 101 J I© t

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. 8 9 LICENSEE CODE 14_ 15 .LICENSE NUMBER .* 25 26 LICENSE TYPE  :.10 57 CAT 58 Bi] :~~~~~ ~©10 1s 10

- 8

• 60 61 10 10 12 13 DOCKET NUMBER 11 'GS 101 69 o Is Io

. EVENT DATE 1a11 -

19 1©1 74

• 75 o I 6 Io REPORT DATE 15 11

• 19 I@ _

.80 : - - -

• EVENT DESCRIPTION AND PROBABLE CONSEQUENCES(§)'

~ !While performing monthly surv. DIS 1400-3, PS 2-:-1430-1466D failed to trip. T.S. 4.5.A

~ I and. Table 3.2.2 requires trip _at SO</= pr(/ "" 100 psig. Dresden setpt. is 95 +/- 5

ITIJ I psig. Safety *significance minimal. Three redundant core spray pp. discharge press*

~-*I sw. 's operable and would have provided necessary permissive at 94.0 psig. Similar

TID 1occurrences ref.-in R.O~ 78-031/03L-0 and 78-045/03L-O. I.

SYSTEM CAUSE . CAUSE.

• COMP. 'VALVE CODE CODE SUBCODE COMPONENT CODE 'SUBCODE t II SUBCODE

~*- !s IF J@ 1

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SEQUENTIAL NJ SI Tl*RI ~!,~:.,,d9 ~1@ l2J@

OCCURRENCE . -'m:PO'RT 20 ....

• ~.'.~ REVISION

. ,... r.:;-. LEA/RO CVENT YEAR REPORT NO. CODE TYPE NO.

. .. \0 REPORT I 7I9I I I I 0 I2 I 9 I I/I I 01 3 I ~ . L::::J L..QJ

• .' : .

• NUMBER 2l 22 23 24 26 27 28 29 . 30 31 32

'-* -_, ACTION FUTURE EFFECT SHUTDOWN * ~ ATTACHMENT NPRD-4 . PRIMECOMP. COMPONENT

• ... _.. . -_TAKEN ACTION ON PLA_NT. METHOD . HOURS SUBMITTED FORM ::;us. SUPPLIER MANUFACTURER

• . l.!J@~@

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. 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

i..:_ause was sticky plunger in pressure switch. Switch removed, cleaned~ reset to trip JTITJ I gTIJ I at 94. 5 psig increasing, and repeatability verified. The Core Spray Pump Auto Blow9own 1

tIJIJ. I Permissive Pressure Switches will continue to be .tested m,onthly using DIS 1400-3°. No . I

I:IIl I further corrective action deemed necessary.

~ _9._______ ....:....~~~~~~~~~~~~~~~~~~~...,.-~---~~~~~~~~~~~~~~~~~.-__::~__,80 FACILITY . ~30 . METHODOF . . *. (;':;\

. STATUS  % POWER OTHER STATUS v:::J DISCOVERY . . . . DISCOVERY DESCRIPTION ~ .

~ µ_J@ L 01 ll ~}@l._l'l_*_N_/A_-_ _ _ 44 l!J{§)~J-._~I_n_s_t_r_u_m_e_n_t~S_u_r_v_e_i_l_l_a_n_e_e~.~-*-~~--1

45. 46 80 I

• ACTIVITY CONTENT ~

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

W@~@I N/A . .* I N/A I 9 10 . 11 44 45 80

. * . PERSONNC:L EXPOSURES . t:;;:;\

-:--r:;, . NUMBER (':;':;\TYPE°

• DESC-i41~TION ~ *, .

~ lol olol'8'~~~1~~N~/A_*_.~~~~~~~~~~~~~~~~~-**_-_-_*~~I 8 9 . 11 12 13 BO PERSONNEL INJURIES .{41)

~.88 l 9

oNroro l@IESCRIPTIONfk*

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. :J* '~- o:~ *1 *~ D 3 )* *3*

~12~~~~--~-~---~~~--'----------...,.-------=-~~-=-~--~--'"-~------'

I BO LOSS or- on DAMAGE TO FACILITY 143'

~ TYPE DESCRIPTION '\:::.)

~ W@I N/A . _J

.. 8 9 10 80

. . ._ PUBLICITY Q

~"":-1 ISSUEDQ DESCRiPTION ~ ._NRC U.SE ONLY .,

~ ~~~10~~-~-N~/A~~~~~~~~~~~~~~~~~~~~~6 B ~I I I I I 11 I I lld.f

\. Gary L. Smith PH Ohl E: _ _Ex_t_._4_2 _1_ _ _ _ _ _ _ ~

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