View source for PNO-IV-89-040, from 890622-23,power Exceeded 82% & Secondary Heat Balance Indication in Control Room Read Approx 79.2%.On 890623,discovered Incorrect Input Into Secondary Heat Balance Calculation.Power Reduced to 65% Pending Evaluation

{{Adams
| number = ML20246A772
| issue date = 06/23/1989
| title = PNO-IV-89-040:from 890622-23,power Exceeded 82% & Secondary Heat Balance Indication in Control Room Read Approx 79.2%.On 890623,discovered Incorrect Input Into Secondary Heat Balance Calculation.Power Reduced to 65% Pending Evaluation
| author name = Westerman T
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION IV)
| addressee name = 
| addressee affiliation = 
| docket = 05000267
| license number = 
| contact person = 
| document report number = PNO-IV-89-040, PNO-IV-89-40, NUDOCS 8907070082
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 2
}}
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[               PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PNO-IV-89-40                   l
!                            .                                                                           l L              .This preliminary notification constitutes EARLY notice of events of POSSIBLE              l safety or public interest significance.- The information is as initially received        {
              .without verification or evaluation, and is basically all that is known by the i
{
Region IV; staff on this date.
FACILITY: Public Service Company of Colorado        Licensee Emergency Classification:
Fort.St. Vrain                             Notification of Unusual Event DN:. 50-267                                 Alert Site Area Emergency              i General Emergency X Not Applicable

==SUBJECT:==
OPERATION AB0VE AUTHORIZED POWER LEVEL By {{letter dated|date=July 2, 1987|text=letter dated July 2,1987}} (Murley to Williams), Fort St. Vrain was authorized to operate at power levels not to exceed 82 percent of full power. By corrected secondary heat balance calculations, it appears that. power exceeded 82 percent from approximately 10:20 p.m. on June 22, 1989, until approximately 2:30 a.m. on June 23, 1989. The maximum calculated secondary heat balance power level during this period was approximately 83.6 percent. That power level is still under review by the licensee During this period, the secondary heat balance indication in the control room read approximately 79.2 percent. The linear power channels of nuclear                   ,
instrumentation read between 79.5 and 81.4 percent power.
At approximately 2:30 a.m. on June 23, 1989, the licensee discovered an apparent incorrect input into the secondary heat balance calculation (data logger). When this input was corrected, the indicated secondary heat balance power level changed from 79 to 82.5 percent. Power was immediately reduced below                    t 82 percent. The licensee's evaluation of the interval during which the incorrect input was used for the secondary heat balance calculation indicated that the actual power level may have reached 83.6 percent at one point.
The licensee has reduced power to 65 percent until an evaluation of this event and a determination of root causes, corrective actions, and actions to prevent a        l recurrence are implemented. The NRC resident inspector is onsite.
The licensee paid a $75,000 civil penalty in 1986 for exceeding a 35 percent power limitation which was in effect at that time, though the circumstances of that event were different from the present one.
Neither the licensee nor the NRC plans to issue a press release.
The state of Colorado will be informed.
C:DRP/B TFWesterman:cs D:DRP JLMilhoan RA RDMartin                              %   0\
6/23/89                  6/23/89           6/23/89 0     82 390623 FNO-IV-89-040 PDC

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               ', Region IV received notification of this occurrence from the HQ 00 at 1:30 p.m.-
l (EDT). Region,IV has informed the ED0's office, the NRR project manager, and
                      -the region's public affairs. officer.
                     -This^information'has been confirmed with a licensee representative.
CONhACT: T.IF. Westerman,-FTS 728-8145 a1                DISTRIBUTION:-
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                     'Chmn. Zech         SECY            NM55            XEDIT    'RES             D0T (Transp. Only)
Comm. Roberts' CA                 NRR-            ARM (7 /nsro}/89 Comm. Carr-
                     .Comm. Rogers OGC -
GPA-01A 01 OGC       FAX:
TWO      (5520: Reg       & HQ) 0 M O[g g '
Comm. Curtiss PA '                SLITP           H-St      PDR ACRS              ED0             OE              TDT       HSAC EW-W      RRI                                                               _.
                                                                         %5EXP     NRC Ops Ctr Licensee (Reactor)
NRCRES, RESPN             Research (Paula Dorm)
NRCRM, AE0D               AE0D(Patty _ Wilson)
NRCRM.. BROWN             ARM (Karen Brown)
                     'NRCRMP, 01ADW                Inspector & Auditor (Displaywriter/PC)
                     'NRCRMP, 01DW                 Investigations (Displaywriter/PC)                                                                    '
INRCO2, OPAPN~            GPA:Public Affairs (Glady Ordaz)                                                                       1 INRC0304,~ SLIPN          GPA: State / Local Indian Tribes Program (Brenda Hill)                                                  l INRC0304, NMSSPN          Nuclear Material Safety & Safeguards (Pat Graaf)
INRC0506, NMSSPN          Nuclear Material Safety & Safeguards (Cathy Jenkins)
             >       '1NRC0708, OEPN              Enforcement (Betty Summers)
INRCI112, NRRPN         'NuclearReactorRegulation(DonnaBerean) 1NRC1516, 0GCPN-          General Counsel (Edna Downs)'
INRC1718, ZECHPN          Chairman'(Lois Altoft)
INRC1718 -ED0PN            Executive Director for Operations (Doris Day)                                                          ,
INRC1718, OCAPN           GPA: Congressional Affairs (Janice Hester)
                      'NRCRI. RIPN                 Region I NRCRII, RIIPN              Region II NRCRIII, RIIIPN            Region III                                                                                              I NRCRIV, RIVPN              Region IV NRCRV, RVPN              . Region V 1
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