ML20084D199

AO 50-219/74/32:on 740521,core Spray Booster Pump Pressure Switch RV4OD Failed in Permissive Position.Cause Under Investigation

ML20084D199
Person / Time
Site:	Oyster Creek
Issue date:	05/22/1974
From:	Carroll J, Rone A JERSEY CENTRAL POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
AO-50-219-74-32, NUDOCS 8304080493
Download: ML20084D199 (4)

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To: Jaros P. O'Reilly - -

Directorato of P.cgulatory Operations Rogion I .

631 Park Avenuo .

King of Prussia, Permsylvania 19406

.p Fron: Jersey Central Peacr. 6 Light Cc pany Oyster Crook Nuclear Generating Station, Docket 850-219 Porked River, Now Jersey 08731 .. *",- .

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Subject:

Abnormal, Occurrence Report No. S0-219/74/32 v;

'Iho following Is a prelininary report being submitted'

, in co plianco with the Technical Specifications i- .,

,. paragraph 6.6.2. .

Prolininary Approval:

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Clif ... [> - Cf - 8304080493 740522 gDRADOCK 05000219 PDR I' TO OCCURRENCE: _ Steady Stato Power Routino Shutdown _ llot Standby - Operation Cold Shutdown , Load Chaages During

                                  .      X         Refueling Shutdown                                       .Routino Pcwor Operation
                          < i .l .                 Routino Startup                                           Other (Specify)

Operation

                                    'Roactor todo switch in REFUEL with the reactor cavity flooded,
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e n, DESCRIt'TIO'i hhile perfoming the annual surveillence tost of the auto-0F OCCURRENCE: depressurization initiation logic with the System I coro spray systen disabled, it was observed that a relay,1K114D in the

• Systen'II coro spray booster pu p initiation logic, was ,in the

                               , . . ~ energized position. . An investigation indicated that the System II
                    .                 core spray booster pump dischargo pressure switch, RV40D, which sctuates .this relay was in the closed position. The switch

w w moeou e.ue wwo m u. ~ uio u piu uiu was N' ,

                                               up t O 2 "st 230 psig, thereby energng the 1K1140 relay.

Norcally closed contacts from the 1K114D relay act in conjunction with the IK114B zul,ay and RV40B pressure switch to trip the NZ033 boostor pu p and start the.re'dundant NZO3D booster pu p . if the pucp does not co:o up to.230 psig after five seconds. Failtire of the switch in the closed position created a condition whereby NZO3B would not have tripped if it-falled to start or

                                                                    ,-            -                             l establish'suffici'ent' dischargo pressure and pu p NZO3D would not
                                           '. ' $avo started since the logic was- failed in the " satisfied" position.                                                         ' ..
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It should be noted 'that this ' failure occurred subsequent to the

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3 April.' 12 plant shutdown since auxiliary contacts from this relay

                                         ', actuato an alarm in 'the station control roon which was not ob-served during poWor operation, hhen tho' plant is in the col'd
                                               , shutdown conditien, this alarm is norna11y on because -it is a
                   .'                           . cocoon alarm for the 285 psig percissive switch, RE17 for. the core spray para 1101 injection valves. Since the reactor.was
                       ,                         fully depressurized,. this switch was. closed and tho akara was on.
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                                                                                                                                                                                                                         ,', ; e APPAPIh7 Ct.USB                                        Design                                                                                                          Procedure OF OCCURRENG:                                         }!anufacture                                                                                                     Unusual Servico Condition Installation /                                                                                                  Inc. Envirenxntal
                                  .                        Construction                                                                                    _ . _

Component Failure a Operator Other (Specify) A. .

                                                'Ihe cc.use of _ this occurrence is presently under investigation.
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The safety significance of this event 7s consF&re @9 NIA1,YSIS OF OCCURRENCE: minimabince the reactor was in.tho shown condition with the ' 5 c'avity flooded. Had a IDCA occurred in this condition, the Systen II. core spray pu=ps which operated satisfactorily would have delivered core spray flow at rated capacity but at a lower discharco pressure, assuming the booster pu:p failed to start.

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The 16h114D rolay was placed in the deenergi::ed position which 00RRECTIVE ACTIO:l: , In this configuration, RV40B would is the tripped condition.

                                    .have acted to sense ir. proper booster pu:p discharge pressure
                                     ' dnd started the redundant pu=p.                                                                                      m I

t.. ' FAI W RE DATA: MSR001D Pressure Switch Typo"DAll43-156 R21E

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