View source for PNO-V-87-053, on 870723,high Radiation Alarm Automatically Diverted Liquid Radwaste Flow to Storage Tank.Licensee Determining Root Cause.Chemical Drain Tank Properly Recirculated & Sampled Prior to Discharge Per Procedure

{{Adams
| number = ML20236D486
| issue date = 07/24/1987
| title = PNO-V-87-053:on 870723,high Radiation Alarm Automatically Diverted Liquid Radwaste Flow to Storage Tank.Licensee Determining Root Cause.Chemical Drain Tank Properly Recirculated & Sampled Prior to Discharge Per Procedure
| author name = Mendonca M, Narbut P
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION V)
| addressee name = 
| addressee affiliation = 
| docket = 05000275
| license number = 
| contact person = 
| document report number = PNO-V-87-053, PNO-V-87-53, NUDOCS 8707300473
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 1
}}
{{#Wiki_filter:. - - -            ~
g PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-V 53Date July 24, 1987 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or               ,
public interest significance. The information presented is as initially received                     l without verification or evaluation and is basically all that is known by Region V staff               ,
on this date.                                                                                       !
FACILITY:   PACIFIC GAS & ELECTRIC COMPANY                  Emergency Classification DIABLO CANYON UNIT 1                            ~
X Notification of Unusual Event        i' DOCKET NO. 50-275                                   Alert SAN LUIS OBISP0 COUNTY, CA                          Site Area Emergency                 i General Emergency                   l Not Applicable                      i

==SUBJECT:==
HIGH RADIATION ALARM DURING LIQUID RAD WASTE DISCHARGE
  'On July 23,1987, at 2:45 pm PDT, during a planned discharge from the Chemical Drain Tank, a high radiation alarm automatically diverted the liquid radwaste flow to                     ,
a storage tank ~. The licensee is determining root cause, but initial indications 6re that a resin exchange procedure in progress prior to the event was the source of the high radiation.
The Chemical Drain Tank had been properly recirculated and sampled prior to dischar9a                .
in accordance with procedure. Likewise, the involved common piping had been properly                 t flushed after the resin exchange.
The licensee suspects that some high activity waste may have been trapped in a branch                1 conn:ction and was freed during the Chemical Tank discharge. The licensee does not                   !
believe a high activity discharge to the environment occurred due to the relative                   4 locations of the radiation monitor and diversion valve in the discharge path.
Post event sampling has shown the liquid in the discharge path to be of acceptable
: c. concentrations for discharge.
This information is current as of 0830 PDT 7/24/87.
CONTACT:   M. Mendonca, RV                         P. Narbut FTS 463-3720                            805-595-2354                                     !
DISTRIBUTION H St.                 MNBB     Phillips       E/W      Willste        Air Rights      Mail:
Chairmln Zech          EDO       NRR           IE         NMSS                   ADMiDMB            4 Comm. Roberts          PA                      DiA        RES                    D0T:Trans Only Comm. Asselstine       MPA                     AE0D                                                  l Comm. Bernthal         OGC Comm. Carr                       Reg ir.ns :
SECY                             INP0lo Mr NSAC_f_a ; ioj
                                                              /g o ACRS                             Licensee: 31u CA .                             (ReactorLicensees)               REGION V: FORM 211                 i PDR                              ResidentInspector<0!9[                                              1 Headquarters Opera H ons Center 2 bc (Revised 3/14/83) 8707300473 870724                                                           i PDR   I&E PNO-V-87-053        PDR                                                 Il E_ N p'l    l TEM        l,

N                                                                                                                                                         l N-O'                                                                  p
                                                                                                        ~
                                  - LaJ
                                                      .                                            ' esene W~ -                             g O'                                                                 LD-
               ,                    LtJ                                     J LAJ Z.                         . @.C                                                                                             . (.
                       -. u                              '. cr*  C*)
                                                         <m
          '}      l t                                                                                                                                                                                       '
t
                                                                                                                            .g s-i k
t               t t
F           i                j v
i A
i                    I 1                  1 I l{-
4
: i. .
                                                                                                                                 }          -s ,
r f-                 s f                                      f,                                                                          3 t        'J :
i f
k,'
i f
: t.        E
                                        >)                                                                                                                R                     t 4
                                                                                                                                                                   -1 I
i                                               s
: s. j4' I
l E
1 i
. _             h -_                                                   m-                                       A.                                   _                        _                     . -. - - -- - - . . - - . - .}}

{{PNO-Nav|region=V}}