View source for PNO-V-87-008, on 870202,valve Opened Which Permitted Less than 50 Gallons of Primary Coolant to Enter Spray Sys & Flow Out Lower Header Ring.Caused by Movats Maint Personnel Error While Testing Valve Operator.Areas Decontaminated

{{Adams
| number = ML20210E622
| issue date = 02/03/1987
| title = PNO-V-87-008:on 870202,valve Opened Which Permitted Less than 50 Gallons of Primary Coolant to Enter Spray Sys & Flow Out Lower Header Ring.Caused by Movats Maint Personnel Error While Testing Valve Operator.Areas Decontaminated
| author name = Dangelo A, Miller L
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION V)
| addressee name = 
| addressee affiliation = 
| docket = 05000312
| license number = 
| contact person = 
| document report number = PNO-V-87-008, PNO-V-87-8, NUDOCS 8702100331
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 1
}}
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4 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-V-87-08                                                                  Date: 02/03/87
  .This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public int. rest significance. The information presented is as initially received without virification or evaluation and is basically all that is known by Region V staff on this date.,
FACILITY: Sacramento Municipal Utility District                                                                         Emergency Classification Rancho Seco Nuclear Power Plant                                                                               Notification of Unusual Event        {
Sacramento County, California                                                                                 Alert Docket No. 50-312                                                                                             Site Area Emergency General Emergency X Not Applicable

==SUBJECT:==
INADVERTENT, LEAKAGE FROM LOWER CONTAINMENT SPRAY RING AT RANCHO SECO
                                                                                                                                                                  ~
On Monday, February 2,1987, licensee maintenance personnel were performing maintenance work (MOVATS testing) on the motor operated block valve operator for the "A" train containment spray system. An electrical clearance had been issued, but no mechanical clearance. This valvo however was the only fluid boundary between the reactor coolant system and the centainment spray rings.
During the work activity, the valve stem moved and opened the valve which permitted less than 50 gallons of primary coolant to enter the spray system and flow out the lower spray header
(
ring. The "A" spray pump did not start during this work activity.
Na personnel were contaminated during the spray.                                                                The upper spray rings are higher than the
  -static head of water available at the time of the activity and therefore did not spray water out the upper spray rings.
Th3 licensee is currently decontaminating areas affected in the the containment lower level.
Ths reactor has been shut down since December 26, 1985, and is currently being cooled by the Decay Heat Removal System which was maintained without loss of flow or heat removal capability during the spray.
This information is current as of 10:00 a.m. (PST), February 3, 1987.
CONTACT:   T. D'Angelo                                                                    L. Miller, Jr.
(209)748-2791                                                                 FTS 463-3869 DISTRIBUTION H St.                   MNBB                                                              Phillips      E/W    Willste    Air Rights       Mail:
Chairman Zech            ED0                                                                NRR          IE     NMSS                       ADM:DMB Comm. Bernthal           PA                                                                              OIA    RES                        COT:Trans Only Comm. Roberts            MPA                                                                             AE0D Comm. Asselstine         OGC Comm. Carr                                                                                  Regions:                                                     7.yg SECY                                                                                        INP0 W95 NSAC F.n ACRS                             Licensee:
CA                                                                                          (ReactorLicensees)             REGION V: FORM 211 PDR                                                                                         Resident Inspector 1 9 f        (Revised 3/14/83)       _
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