ML17252B492

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LER 78-028/01X-1 for Dresden, Units 2 and 3 Re NRC Request for Immediate Actions to Be Taken to Mitigate the Potential for a Spurious Closure of a Recirculation Loop Suction Valve with a LOCA Occurring Between the Loop Discharge and Suction
ML17252B492
Person / Time
Site: Dresden  Constellation icon.png
Issue date: 08/28/2017
From: Stephenson B
Commonwealth Edison Co
To: James Keppler
NRC/RGN-III
References
BBS LTR 78-1224 LER 78-028/01X-1
Download: ML17252B492 (3)
v • d • e


Text

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<n BBS LTR #78~1224 JamesG. Kepp1er, Regicinal*Director Directorate of Regulatory Operations: .;-. Region III u.s-. Nuclear Regulatory Connniss1:!6.ri~,

79-~ Roosevelt Road Glen Ellyn, IL 60137 Repor;~_i,_;~ Occur:tenc~ "Update Report" #78~028/0lX-1,. .Docket ~.

is oeing submitted* to your office to correct the Cause Cod~

  • Cause Suocode (Items 12 and 13) used in the original Licensee Event Report 78-02'8/0lT-fQJ. The report concerned a potential problem which had been p_ostulated with* the designed ECCS logic system.

'Only items (12) & (13) on the original report_ fa.rm have been reclassified to indicate a design error. No other chang*es have been made.

  • This event was reported to you under DresdenNuclear*Power Station Technical Specification '6.6.B.l.(i)., performance of structures, s~st~ms, or com-ponents that requires remedial action or corrective measures to prevent operation in a manner less conservative 'thah assumed in the. ac::/cident analyses in the safety ari.alys_is
  • r~port or technical* specifications bases; or d°is-covery during plant.life of cond;itions not specifically considered in the safety analysis report or technical specifications that require remedial action or corrective measu1"es_to.prevent the existence or devel-opment of an unsafe condition.

Su erintendep.t Dresden Nuclear Power Station B!3S/deb

  • Enclosure cc: Director of Inspection & Enforcement Director of Management Information & Program Control c-A\JG 3 1 197B File/NRC
  • N~~~z~.i,36_~ . ,; . *_.., U. S, NUCLEAH.REGULATo'RY COMMISSION
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,. * .. * .. ' . _.A~UCENSEE EV_ ENT RE. PORT_ *. . te Report. Previous 9 . ., rt Date: . 5/ 5/78

.. CON.TROL BLOCK:

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.7 8 9 LICENSEE CODE 14 15 . . . LICENSE NUMBER - 25 26 LICENSE TYPE JO 57 CAT 58 .

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7. 8 60 61 DOCKET NUMBER 68. 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

[QID I During normal Unit 2 op.. .:e=-r=-a=-t=-1=-*o=-n::;;*~a=-n.:::d__:;r..:o..:u..:t:..:.i:..:.n:...:e=--U=-n=1=-*t=--=-3-=-R.:::e.:..:.f..::u..::e..::l.:::i.:::n:;,.gz__;O:....p....:e:...;r:...:a::.t.::..i::.o.::..n=s__;:.o..:.;n:......:.A:..P....:r:....;:i:o.:l::.......:2~1~......* _ _.

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. CQ:DJ spurious closure* of a recirculation loop suction valve with a LOCA occurring between

  • .[§J]J the loop discharge and suction valves. This situation has not been previously analyzejd

. [QI[) I and is 'reportable per section 6 .*6. B. l. (i) of the Technical* Specifications . "

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7. 8* 9 BO SYSTEM CAUSE CAUSE COMF. VALVE

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. 7 8'. 9 10 11 12 . . 13 . 18 19 20 SEQUENTIAL 'OCCURRENCE REF'ORT REVISION

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  • CAUSE DESCRIPTION AND CORRECTIVE ACTIONS
  • . ~ I On April 21, 1978 to comply with the NRC request a Mod. was initiated for each unit I.

DJTI I which will defeat. that portion of the LPCI Loop Select Logic which auto cfoses the DJ)) suction valves. This Mod. is presently pending SNED approval. As an interim solutionJ

    • ITIJJ I both recirc *. loop s.uctiOn valve circuit breakers will be taken o.o.s. in the open I.

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7 8 9 FACILITY . 13Q\ METHOD OF 80

. . STATUS  % POWER OTHER STATUS ~ DISCOVERY

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. ACTIVITY CONTENT - (.;;;\ . . . .. . . ~

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    • _,.>/*:*;.~~L"*:~*~,;; ATTACHMENT TO LICENSEE EVENT REPORT 78-028/0!"x-( ,*::.*,-,:,_ . . ..  :~ ...

. .... _:**.:_ ... :. EDISON COMPANY (C1"..lE) *.-".*.*.*.*_* *,*,* -.*~*.:*_._.._'.: -._~.*.- :,. _.*.;:_~.- * : .*_~:c';_- _*-~_* .*

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DRESDEN UNIT-2 (ILDRS-2)

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..... **:. ,.-;;*_.* *'**;_ ::**~u~~g normal Unit 2 ~pe~ati;~ at -~iOMW~ and rou~in~ U~it 3 : *.

refueling operations on April 21, 1978 the Nuclear Regulatory Commi-

~sion "(NRC) requested that adequate action be taken immediately

  • to mitigate the potential for a spurious closure of a recirculation

)i*.Toop suction valve with a LOCA ~ccurring between the loop discharge

-~:._<;, :_:. and suction valves. This situation, which had not been considered .

,:\_;'-.in* the current LOCA analysis, could decrease the reactor. water

  • inventory while reactor pressure remained high. _Technical Specifi-cation 6.6.B.l.i. requires reporting of performance of structures,
  • systems,*or *components that requires remedial action or corrective measures to prevent operation in a manner less conservative than assumed in the accident analyses in the safety analysis report or*

. technical specifications bases; or discovery du.ring plant life *

.. 6f conditions not specifically ~on~idered iri the safety analysis . , ... *, ...

  • report or technical specifications that require remedial action or corrective measures to prevent the existence or development of ..:. ' { ~* *~ *..

'.;>.*_._:* . _._*an* unsafe condition. .. 7 . .* . - . . . . ,. .. .*. . . . . .. **.',::__.)**:::<*c*:* *:*

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. 'On April 21, 1978, t~ comply with th~ above. NRC requ~st, a*

.'-modification was initiated for each unit. The modification will .*_ .:* ..

  • defeat* only that portion of the Low Pressure Coolant injection:..

. :. (LPCI) Loop Select Logic which automatically closes the recircu~ * *, .. .

~

,,-*~*.*lation loop suction valves. The Station Nuclear Engineering *'

-pepartnient (SNED) is currently reviewing the modification. The*.

Unit 2 mo.dification will n.Jt be completed t.intil a unit outage of

-:~~*:sufficient duration occurs following SNED approval. .A.s an interim*.*

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  • solution, both recirculatfbn loop suction valve circuit breakers ...-

.:-~~-'. ;:-;:'/:}/:,:. -~~;;. were. taken out of service with the valves in the open position.

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. ::.-;?\:'.*::*_>!;*/):-.;_:*::While in this condition, the LPCI system will continue to function

'*::~_;*:~~:*.;~;;::~(;',::::.::.'.ff:>:as originally analyzed *. Operation of the suction valves will

. _ ':f(~,i'\:::(;::*~::~,l);:;....{.be permitted per operating order f/27-78 if an* operational event

.} ,\:*~::-~;F;~:,;:,:-::\~:,(f~\:.*:*occu.rs *which requires the suction valve to be closed.* In this*

  • :;_;::..~:.:(/,:":*;:_:,.<-~:.:*_case both the loop discharge valve and _discharge bypass valve ,*

. ~-'.*:>.,:->:,:'::;-.:<<~:-*::_:-*will also be closed thereby isolating the recirculation loop. . .. __ . .

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