PNO-V-86-047, on 860722,licensee Declared Unusual Event Due to Both Trains of Decay Heat Sys Being Declared Inoperable. RCS Temp Was Approx 84 F W/Atmospheric Pressure: Difference between revisions

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#REDIRECT [[PNO-V-86-047B, on 860725,licensee Secured from Unusual Event After Establishing Temporary Compensatory Measures.Util Plans to Return Diesel Generator a to Svc by 860730. Replacement for DHR Pump B Procured]]
{{Adams
| number = ML20212E968
| issue date = 07/23/1986
| title = PNO-V-86-047:on 860722,licensee Declared Unusual Event Due to Both Trains of Decay Heat Sys Being Declared Inoperable. RCS Temp Was Approx 84 F W/Atmospheric Pressure
| author name = Miller L, Perez G
| author affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
| addressee name =
| addressee affiliation =
| docket = 05000312
| license number =
| contact person =
| document report number = PNO-V-86-047, PNO-V-86-47, NUDOCS 9711040124
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION & AUDIT & I&E CIRCULARS
| page count = 1
}}
{{#Wiki_filter:__
                                                                                      \
PRELIMINARY NOTIFICATION OF EVENT OR Uh05UAL OCCURRENCE- PNO-V-86 47              Date 07/23/86 This preliminary notification constitutes EARLY notice of events of POS$1BLE safety or l  A      public interest significance. The_information presented is as initially received i[y      without verification or evaluation and is basically all that is known by Region V staff on this date.                ,                          ,
                                                  .          . ,1  ..,
FACILITY: SACRAMENTO MUNICIPAL UTILITY DISTRICT                    Emergency Classification RANCHO SEC0 XX Notification of Unusual Event DOCKET NO. 50-312                      "
Alert Site Area Emergency General Emergency Not Applicable
 
==SUBJECT:==
INOPERABILITY OF THE DECAY HEAT REMOVAL TRAINS i
The licensee declared an Unusual Event at 1446 PDT on 7/22/86 due to both trains of the decayheatsystem(DgS)beingdeclaredinoperable. ReactorCoolantSystem(RCS) temperature
        , was approximately 84 F with atmospheric pressure.
      *,   The  'B' train was declared inoperable because the licensee identified a small leak from the casing of the "B" decay heat system pump. The leak was quantified at about 30 drops per minute.
The licensee is investigating the cause and extent of the apparent discontinuity in the "B" DHS pump casing.
The  'A' train was e nsequently also inoperable because the "A" diesel generator was out of serv M for taspection. and repair work. (The "A" DHS had been considered operable although its emergency power was out of service, because the "B" train at DHS had been operable. With the identification of the "B" DHS pump leak, both ths "A" and "B" train of O      decay heat removal becar.e inoperable, even though both are currently capable of removirg heat from the reactor.)
The licensee classified the event an Unusual Event based on the potential degradation of the safety level of the plant. No release of radioactivity was expected. The state and                    ,
i' counties' officials were notified as was the NRC er:ergency center. The licensee manned the Technical Support Center (TSC) for approximately one hour.
The information is current as of 0730 PDT, July 23, 1986. (The Unusual Event is being maintained pending repair to the 'B' pump or restoration of the 'A' diesel generator.)            i CONTACT:              G. Perez                  L. Miller, Jr.
b
                                                                                                                ! \
(209)748-2791              FTS 463 8369 DISTRIBUTION
                                                                                                            \ [)
H St.                          Phillips MNBB-                  E/W          Willste    Air Rights      Mail:
Chairman Zech          EDO      NRR          IE          NMSS                      ADH:DMB PA                    OlA          RES                        DOT:Trans Only Comm. Bernthal        MPA                    AE00 Comm. Roberts          ELD Comm. Asselstine                Regions:
SECY                              INP0                    ACRS NSAC                                          Licensee:
C                                (ReactorLicensees)              REGION V: FORM 211 POR                              Resident inspector _,                (Revised 3/14/83) b                    C/R Distribution: Chm, Cmrs, V      ,
PE, GC, CA, ACRS, Historian, SECY, Records.
9711040124 860723 PDR    14 E PNO-V-86-047          PDR
                                                                                                                    -}}
 
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Revision as of 21:33, 18 December 2021

PNO-V-86-047:on 860722,licensee Declared Unusual Event Due to Both Trains of Decay Heat Sys Being Declared Inoperable. RCS Temp Was Approx 84 F W/Atmospheric Pressure
ML20212E968
Person / Time
Site: Rancho Seco
Issue date: 07/23/1986
From: Miller L, Perez G
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
To:
References
PNO-V-86-047, PNO-V-86-47, NUDOCS 9711040124
Download: ML20212E968 (1)
v • d • e


__

\

PRELIMINARY NOTIFICATION OF EVENT OR Uh05UAL OCCURRENCE- PNO-V-86 47 Date 07/23/86 This preliminary notification constitutes EARLY notice of events of POS$1BLE safety or l A public interest significance. The_information presented is as initially received i[y without verification or evaluation and is basically all that is known by Region V staff on this date. , ,

. . ,1 ..,

FACILITY: SACRAMENTO MUNICIPAL UTILITY DISTRICT Emergency Classification RANCHO SEC0 XX Notification of Unusual Event DOCKET NO. 50-312 "

Alert Site Area Emergency General Emergency Not Applicable

SUBJECT:

INOPERABILITY OF THE DECAY HEAT REMOVAL TRAINS i

The licensee declared an Unusual Event at 1446 PDT on 7/22/86 due to both trains of the decayheatsystem(DgS)beingdeclaredinoperable. ReactorCoolantSystem(RCS) temperature

, was approximately 84 F with atmospheric pressure.

  • , The 'B' train was declared inoperable because the licensee identified a small leak from the casing of the "B" decay heat system pump. The leak was quantified at about 30 drops per minute.

The licensee is investigating the cause and extent of the apparent discontinuity in the "B" DHS pump casing.

The 'A' train was e nsequently also inoperable because the "A" diesel generator was out of serv M for taspection. and repair work. (The "A" DHS had been considered operable although its emergency power was out of service, because the "B" train at DHS had been operable. With the identification of the "B" DHS pump leak, both ths "A" and "B" train of O decay heat removal becar.e inoperable, even though both are currently capable of removirg heat from the reactor.)

The licensee classified the event an Unusual Event based on the potential degradation of the safety level of the plant. No release of radioactivity was expected. The state and ,

i' counties' officials were notified as was the NRC er:ergency center. The licensee manned the Technical Support Center (TSC) for approximately one hour.

The information is current as of 0730 PDT, July 23, 1986. (The Unusual Event is being maintained pending repair to the 'B' pump or restoration of the 'A' diesel generator.) i CONTACT: G. Perez L. Miller, Jr.

b

! \

(209)748-2791 FTS 463 8369 DISTRIBUTION

\ [)

H St. Phillips MNBB- E/W Willste Air Rights Mail:

Chairman Zech EDO NRR IE NMSS ADH:DMB PA OlA RES DOT:Trans Only Comm. Bernthal MPA AE00 Comm. Roberts ELD Comm. Asselstine Regions:

SECY INP0 ACRS NSAC Licensee:

C (ReactorLicensees) REGION V: FORM 211 POR Resident inspector _, (Revised 3/14/83) b C/R Distribution: Chm, Cmrs, V ,

PE, GC, CA, ACRS, Historian, SECY, Records.

9711040124 860723 PDR 14 E PNO-V-86-047 PDR

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